ULS 60-Watt Series
www.murata-ps.com
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
FEATURES
n
Small footprint DC/DC converter, ideal for
high current applications
Typical unit
n
Tiny 0.9" x 1.3" x 0.40" open frame package
n
Industry standard DOSA "brick" format
and pinout with surface mount option
n
36-75 Volts DC input range
n
2250 Volt Basic input/output isolation
(48V models)
n
Up to 66 Watts total output power with
overtemperature shutdown
n
High efficiency synchronous rectifier forward
topology
n
Stable no-load operation with no required
external components
n
Operating temperature range -40 to +85°C
with derating
n
Certified to UL 60950-1, CSA-C22.2 No. 234,
EN60950-1 safety approvals, 2nd Edition
n
Extensive self-protection shut down features
PRODUCT OVERVIEW
The world of “brick” DC/DC converters has seen
a steady size reduction. The ULS series makes
another dramatic size shrink down to a “sixteenthbrick” width (0.9 inches) while still retaining up
to 66 Watt output and full 2250 Volt DC isolation.
The PC-board mount converter family accepts
36 to 75 Volts DC inputs and delivers fixed outputs
regulated to within ±0.2%. The ULS converters
are ideal for datacom and telecom applications,
cell phone towers, data centers, server farms and
network repeaters.
ULS outputs may be trimmed within ±10% of
nominal output while delivering fast settling to
current step loads and no adverse effects from
higher capacitive loads. Excellent ripple and noise
specifications assure compatibility to circuits using
CPU’s, ASIC’s, programmable logic and FPGA’s. No
minimum load is required. For systems requiring
controlled startup/shutdown, an external remote
On/Off control may use a switch, transistor or digital
logic. Remote Sense inputs compensate for resistive line drops at high currents.
Many self-protection features on the ULS series
avoid both converter and external circuit hazards.
These include input undervoltage lockout and
overtemperature shutdown. The outputs current
limit using the “hiccup” autorestart technique and
the outputs may be short-circuited indefinitely.
Additional features include output overvoltage and
reverse conduction elimination.
The synchronous rectifier forward topology yields
high efficiency for minimal heat buildup and “no
fan” operation.
+SENSE
(7)
+Vin
(1)
+Vout
(8)
SWITCH
CONTROL
-Vout
(4)
-Vin
(3)
INPUT
UNDER VOLTAGE,
OVER TEMPERATURE,
AND OUTPUT
OVER VOLTAGE
COMPARATORS
PULSE
TRANSFORMER
PWM
CONTROLLER
OPTO
ISOLATION
-SENSE
(5)
REFERENCE
ERROR AMP
REMOTE
ON/OFF
CONTROL
(2)
Vout
TRIM
(6)
Typical topology is shown
Figure 1. Simplified Block Diagram
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
MDC_ULS Series.C07 Page 1 of 24
ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE
Output
Input
Power R/N (mV pk-pk) Regulation (max.) Vin Nom. Range
Iout
(A, max.) (W)
(V)
(V)
Typ.
Max.
Line
Load
Root Model
Vout
(V)
ULS-3.3/20-D48N-C
3.3
20
66
70
120
±0.1%
±0.2%
48
ULS-5/12-D48N-C
5
12
60
50
80
±0.125%
±0.25%
ULS-12/5-D48N-C
12
5
60
80
120
±0.125%
±0.25%
Please refer to the Part Number Structure when ordering.
These specifications are preliminary. Contact Murata Power Solutions for availability.
All specifications are at nominal line voltage and full load, +25°C unless otherwise noted. See
detailed specifications. Output capacitors are 1 μF ceramic multilayer in parallel with 10 μF
ULS-3.3/20-D48P-C
ULS-3.3/20-D48PH-C
ULS-3.3/20-D48PH-Y
ULS-3.3/20-D48PM-C
Efficiency
C76
Package
Iin, no load
(mA)
Iin, full
load (A)
Min.
Typ.
36-75
20
1.53
89%
90%
0.9x1.3x0.40
48
36-75
40
1.39
88%
90%
0.9x1.3x0.40
48
36-75
50
1.37
88%
91%
0.9x1.3x0.40
Case (inches)
electrolytic.
I/O caps are necessary for our test equipment and may not be needed for your application.
➃ Regulation specifications describe output voltage deviations from a nominal/midpoint value to either
extreme (50% load step).
ULS-3.3/20-D48P-Y
ULS-5/12-D48P-Y
ULS-5/12-D48P-C
ULS-5/12-D48PH-C
ULS-5/12-D48PH-Y
ULS-5/12-D48PL2-C
ULS-5/12-D48PM-C
ULS-12/5-D48P-Y
ULS-12/5-D48P-C
ULS-12/5-D48PH-C
ULS-12/5-D48PH-Y
ULS-12/5-D48PL2-C
ULS-12/5-D48PM-C
PART NUMBER STRUCTURE
ULS - 3.3 / 20 - D48 N M H Lx - C
RoHS Hazardous Substance Compliance
(does not claim EU RoHS exemption 7b–lead in solder)
C = RoHS-6
Y = RoHS-5
Sixteenth Brick Series
Nominal Output Voltage:
Maximum Rated Output Current
Current in Amps
Input Voltage Range:
D48 = 36-75 Volts (48V nominal)
Pin Length Option (Thru-hole only)
Blank = Standard pin length 0.180˝ (4.6mm)
L1 = 0.110˝ (2.79mm) ➀
L2 = 0.145˝ (3.68mm) ➀
Conformal Coating:
Blank = No coating, standard
H = Coating added, optional special order*
(not available on SMT models)
SMT Version
Blank = Through-hole mount, no SMT
M = Surface mount (MSL = 3)
➁
On/Off Control Logic:
N = Negative
P = Positive
➀ Special quantity order is required; samples available with standard pin length only.
➁ SMT (M) versions not available in sample quantities.
➂ Some model number combinations may not be available. See website or contact your
local Murata sales representative.
Simplified Murata-PS logo
Rev
Product Label
As shown in figure 2, because of the small size of these products, the product labels
contain a simplified Murata-PS logo and a character-reduced code to indicate the model
number and manufacturing date code. Not all items on the label are always used. Please
note that the label differs from the product photograph.
MODEL NAME
Figure 2. Label Artwork Layout
Label 1
REG.-Nr. D216
0001
YYWW
Serial # (4 digits)
Date code
Bar code: Data matrix
Label 2
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MDC_ULS Series.C07 Page 2 of 24
ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
FUNCTIONAL SPECIFICATIONS, ULS-3.3/20-D48
ABSOLUTE MAXIMUM RATINGS
Input Voltage, Continuous
Input Voltage, Transient
Isolation Voltage
Input Reverse Polarity
On/Off Remote Control
Output Power
Conditions ➀
Full power operation
Operating or non-operating, tested:
100 mS max. duration
Input to output
None, install external fuse
Power on, referred to -Vin
Minimum
Typical/Nominal
Maximum
80
Units
Vdc
100
Vdc
2250
Vdc
Vdc
Vdc
W
None
0
0
15
66.66
Current-limited, no damage,
0
20
A
short-circuit protected
Storage Temperature Range
Vin = Zero (no power)
-55
125
°C
Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other
than those listed in the Performance/Functional Specifications Table is not implied or recommended.
INPUT
Operating voltage range
36
48
75
Vdc
Recommended External Fuse
Fast blow
4
A
Start-up threshold, turn on
Rising input voltage
33.5
34.5
35.5
Vdc
Falling input voltage
31.5
32.5
33.5
Vdc
Undervoltage shutdown, turn off 12
Overvoltage protection
NA
Vdc
Reverse Polarity Protection
None, install external fuse
None
Vdc
Internal Filter Type
Capacitive
Output Current
Input current
Full Load Conditions
Low Line
Inrush Transient
Output in Short Circuit
No Load input current
Shut-Down Mode Input Current
Reflected (back) ripple current ➁
Reflected (back) ripple current ➁
Vin = nominal
Vin = minimum
1.53
2.08
0.05
150
30
5
150
20
Iout = minimum, unit=ON
no filtering
Measured at input with specified filter
1.56
2.15
300
100
15
210
30
A
A
A2-Sec.
mA
mA
mA
mAp-p
mAp-p
GENERAL and SAFETY
Vin=48V, full load
Vin=Min
Efficiency
89
86
Isolation
Isolation Voltage, input to output
Insulation Safety Rating
Isolation Resistance
Isolation Capacitance
Safety (meets the following requirements)
Calculated MTBF
Calculated MTBF ➃
90
88
%
%
2250
basic
100
1000
UL-60950-1, CSA-C22.2 No.60950-1,
IEC/EN60950-1, 2nd Edition
Per MIL-HDBK-217F, ground benign,
Tambient=+40°C
Per Telcordia SR332, issue 1, class 3, ground
fixed, Tambient=+40°C
Vdc
MΩ
pF
Yes
TBD
Hours x 103
3200
Hours x 103
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
Startup Time
Startup Time
480
19
Dynamic Load Response
Dynamic Load Peak Deviation
Power on, Vout regulated
Remote ON to Vout regulated
50-75-50% load step, settling time to within
1% of Vout.
same as above
500
5
5
520
15
10
KHz
mS
mS
50
150
µSec
±150
±200
mV
1
0.8
15
2
V
V
mA
FEATURES and OPTIONS
Remote On/Off Control
“N” suffix:
Negative Logic, ON state
Negative Logic, OFF state
Control Current
ON = Pin grounded or external voltage
OFF = Pin open or external voltage
open collector/drain
-0.1
2.5
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MDC_ULS Series.C07 Page 3 of 24
ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
FUNCTIONAL SPECIFICATIONS, ULS-3.3/20-D48 (CONT.)
FEATURES and OPTIONS (cont.)
Remote On/Off Control (cont.)
“P” suffix:
Positive Logic, ON state
Positive Logic, OFF state
Control Current
Conditions ➀
Minimum
Typical/Nominal
Maximum
Units
ON = Pin open or external voltage
OFF = Ground pin or external voltage
open collector/drain
3.5
0
1
15
1
2
V
V
mA
0
66
66.66
W
3.267
-1
-10
3.75
3.3
3.333
1
10
4.95
Vdc
% of Vset
20
A
30
A
OUTPUT
Total Output Power
Voltage
Nominal Output Voltage ➂ 15
Settling Accuracy
Output Voltage Range ➇
Overvoltage Protection
Remote Sense Compensation
Current
Output Current Range
Minimum Load
Current Limit Inception 13
Short Circuit ➄
No trim
At 50% load
User-adjustable
Via magnetic feedback
Of Vset 18
0
98% of Vnom., cold condition
Short Circuit Current
Short Circuit Duration
(remove short for recovery)
Short circuit protection method
Regulation
Line Regulation ➆
Load Regulation ➆
Ripple and Noise
Temperature Coefficient
Maximum Capacitive Loading
(10% ceramic, 90% Oscon)
22
4.25
10
20
No minimum load
26
Hiccup technique, autorecovery within ±1%
of Vout
6.6
Output shorted to ground, no damage
Continuous
Vdc
%
A
Hiccup current limiting
Vin=min. to max., Vout=nom., nom load
Iout=min. to max
5 Hz- 20 MHz BW
At all outputs
±0.1
±0.2
70
0.02
Low ESR, .02 ohms max (resistive load)
1000
μF
Cxx case
WxLxH
1.3x0.9x0.4
33x22.9x10.2
0.58
16.4
.062 & .04
1.575 & 1.016
Gold-plated copper
alloy with nickel
underplate
50
5
Inches
mm
Ounces
Grams
Inches
mm
120
V
V
mV pk-pk
% of Vout./°C
MECHANICAL (Through Hole Models)
Outline Dimensions
(Please refer to outline drawing)
Weight
Through Hole Pin Diameter
Through Hole Pin Material
Nickel subplate
Gold overplate
TH Pin Plating Metal and Thickness
µ-inches
µ-inches
ENVIRONMENTAL
Operating Ambient Temperature Range
11
Storage Temperature
Operating Case Temp
Thermal Protection/Shutdown
Electromagnetic Interference
Conducted, EN55022/CISPR22
Radiated, EN55022/CISPR22
RoHS rating
No derating, full power, 200 LFM,
no condensation
Vin = Zero (no power)
No derating required
Measured at hotspot
External filter is required
-40
85
°C
-55
-40
110
125
120
120
°C
°C
°C
115
B
B
RoHS-6
Class
Class
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MDC_ULS Series.C07 Page 4 of 24
ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
TYPICAL PERFORMANCE DATA, ULS-3.3/20-D48
Efficiency vs. Line Voltage and Load Current @ 25°C
Maximum Current Temperature Derating at Sea Level
(Vin = 48V, longitudinal airflow)
25
100
Output Current (Amps)
95
Efficiency (%)
90
85
VIN = 75V
VIN = 48V
VIN = 36V
80
75
70
20
Natural convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
15
10
5
0
65
30
60
3
4
6
8
10
12
14
16
18
20
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (ºC)
Load Current (Amps)
(Resistive loads 50% with +25% step Vin=48V)
Transient Response (Load from 75% to 50%)
Transient Response (Load from 50% to 75%)
Enable Start-up
Enable Start-up (Vin=48V Iout=20A)
Ripple and Noise (1uF Ceramic and 10uF Tantalum Capcitors)
Enable Start-up (Vin=48V Iout=0A)
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MDC_ULS Series.C07 Page 5 of 24
ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
TYPICAL PERFORMANCE DATA, ULS-3.3/20-D48 (CONT.)
Enable Start-up (Vin=48V Iout=20A)
Ripple and Noise (1uF Ceramic and 10uF Tantalum Capcitors)
Enable Start-up (Vin=48V Iout=0A)
R/N Waveform (Vin=48V Iout=20A)
R/N Waveform (Vin=48V Iout=0A)
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MDC_ULS Series.C07 Page 6 of 24
ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
FUNCTIONAL SPECIFICATIONS, ULS-5/12-D48
ABSOLUTE MAXIMUM RATINGS
Input Voltage, Continuous
Input Voltage, Transient
Isolation Voltage
Input Reverse Polarity
On/Off Remote Control
Output Power
Conditions ➀
Full power operation
Operating or non-operating, tested:
100 mS max. duration
Input to output
None, install external fuse
Power on, referred to -Vin
Minimum
Typical/Nominal
Maximum
80
Units
Vdc
100
Vdc
2250
Vdc
Vdc
Vdc
W
None
0
0
15
60.6
Current-limited, no damage,
0
12
A
short-circuit protected
Storage Temperature Range
Vin = Zero (no power)
-55
125
°C
Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other
than those listed in the Performance/Functional Specifications Table is not implied or recommended.
INPUT
Operating voltage range
36
48
75
Vdc
Recommended External Fuse
Fast blow
4
A
Start-up threshold, turn on
Rising input voltage
33
34.5
35.5
Vdc
Falling input voltage
31
32.5
33.5
Vdc
Undervoltage shutdown, turn off 12
Overvoltage protection
NA
Vdc
Reverse Polarity Protection
None, install external fuse
None
Vdc
Internal Filter Type
LC
Output Current
Input current
Full Load Conditions
Low Line
Inrush Transient
Output in Short Circuit
No Load input current
Shut-Down Mode Input Current
Reflected (back) ripple current ➁
Reflected (back) ripple current ➁
Vin = nominal
Vin = minimum
1.39
1.85
0.05
100
40
5
400
25
Iout = minimum, unit=ON
no filtering
Measured at input with specified filter
1.43
1.91
200
80
10
500
35
A
A
A2-Sec.
mA
mA
mA
mAp-p
mAp-p
GENERAL and SAFETY
Vin=48V, full load
Vin=Min
Efficiency
88
88
Isolation
Isolation Voltage, input to output
Insulation Safety Rating
Isolation Resistance
Isolation Capacitance
Safety (meets the following requirements)
Calculated MTBF
Calculated MTBF ➃
90
90
%
%
2250
basic
10
1000
UL-60950-1, CSA-C22.2 No.60950-1,
IEC/EN60950-1, 2nd Edition
Per MIL-HDBK-217F, ground benign,
Tambient=+40°C
Per Telcordia SR332, issue 1, class 3, ground
fixed, Tambient=+40°C
Vdc
MΩ
pF
Yes
TBD
Hours x 103
3200
Hours x 103
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
Startup Time
Startup Time
400
10
10
19
Dynamic Load Response
Dynamic Load Peak Deviation
Power on, Vout regulated
Remote ON to Vout regulated
50-75-50% load step, settling time to within
1% of Vout.
same as above
20
20
KHz
mS
mS
50
100
µSec
±200
±250
mV
1
0.8
15
2
V
V
mA
FEATURES and OPTIONS
Remote On/Off Control
“N” suffix:
Negative Logic, ON state
Negative Logic, OFF state
Control Current
ON = Pin grounded or external voltage
OFF = Pin open or external voltage
open collector/drain
-0.1
2.5
www.murata-ps.com/support
MDC_ULS Series.C07 Page 7 of 24
ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
FUNCTIONAL SPECIFICATIONS, ULS-5/12-D48 (CONT.)
FEATURES and OPTIONS (cont.)
Remote On/Off Control (cont.)
“P” suffix:
Positive Logic, ON state
Positive Logic, OFF state
Control Current
Conditions ➀
Minimum
Typical/Nominal
Maximum
Units
ON = Pin open or external voltage
OFF = Ground pin or external voltage
open collector/drain
3.5
0
1
15
1
2
V
V
mA
0
60
60.6
W
4.95
-1
-10
6
5
5.05
1
10
7.2
Vdc
% of Vset
OUTPUT
Total Output Power
Voltage
Nominal Output Voltage ➂ 15
Settling Accuracy
Output Voltage Range ➇
Overvoltage Protection
Remote Sense Compensation
Current
Output Current Range
Minimum Load
Current Limit Inception 13
Short Circuit ➄
No trim
At 50% load
User-adjustable
Via magnetic feedback
Of Vset 18
0
Short Circuit Duration
(remove short for recovery)
Short circuit protection method
Regulation
Line Regulation ➆
Load Regulation ➆
Ripple and Noise
Temperature Coefficient
Maximum Capacitive Loading
(10% ceramic, 90% Oscon)
Vdc
%
12
No minimum load
16
12
A
19
A
Hiccup technique, autorecovery within ±1%
of Vout
0.5
1
A
Output shorted to ground, no damage
Continuous
98% of Vnom., after warm up
Short Circuit Current
6.5
10
14
Hiccup current limiting
Vin=min. to max., Vout=nom., nom load
Iout=min. to max
5 Hz- 20 MHz BW
At all outputs
±0.125
±0.25
50
0.02
Low ESR, .02 ohms max (resistive load)
220
Cxx case
WxLxH
1.3x0.9x0.4
33x22.9x10.2
0.58
16.4
.062 & .04
1.575 & 1.016
Gold-plated copper
alloy with nickel
underplate
50
5
100
1000
V
V
mV pk-pk
% of Vout./°C
μF
MECHANICAL (Through Hole Models)
Outline Dimensions
(Please refer to outline drawing)
Weight
Through Hole Pin Diameter
Through Hole Pin Material
Nickel subplate
Gold overplate
TH Pin Plating Metal and Thickness
Inches
mm
Ounces
Grams
Inches
mm
µ-inches
µ-inches
ENVIRONMENTAL
Operating Ambient Temperature Range
11
Storage Temperature
Operating Case Temp
Thermal Protection/Shutdown
Electromagnetic Interference
Conducted, EN55022/CISPR22
Radiated, EN55022/CISPR22
RoHS rating
No derating, full power, 200 LFM,
no condensation
Vin = Zero (no power)
No derating required
Measured at hotspot
External filter is required
-40
85
°C
-55
-40
110
125
120
130
°C
°C
°C
115
A
A
RoHS-6
Class
Class
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MDC_ULS Series.C07 Page 8 of 24
ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
TYPICAL PERFORMANCE DATA, ULS-5/12-D48
Efficiency and Power Dissipation @ 25°C
Maximum Current Temperature Derating at Sea Level
(Vin = 48V, airflow is from Vin to Vout)
90
10
85
9
VIN = 75V
VIN = 48V
VIN = 36V
80
75
8
7
70
6
65
5
60
Power Dissipation
(Vin = 48V)
55
50
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
4
3
13
2
Output Current (Amps)
11
Power Dissipation (Watts)
12
95
Efficiency (%)
100
12
Natural convection
11
10
9
8
7
30
35
40
45
Load Current (Amps)
Enable Start-up (Vin=48V, Iout=12A, Ta=+25°C) Trace 2=Output, Trace 4= Enable.
50
55
60
65
70
75
80
85
Ambient Temperature (ºC)
Enable Start-up (Vin=48V, Iout=0A, Ta=+25°C) Trace 2=Output, Trace 4= Enable.
Enable Start-up (Vin=48V, Iout=12A, Cload=1000uF, Ta=+25°C)
Trace 2=Output, Trace 4= Enable.
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MDC_ULS Series.C07 Page 9 of 24
ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
TYPICAL PERFORMANCE DATA, ULS-5/12-D48 (CONT.)
Output and Ripple Noise (Vin=48V, Iout=12A, 1uF Ceramic and 10uF tantalum capacitors)
Output and Ripple Noise (Vin=48V, Iout=0A, 1uF Ceramic and 10uF tantalum capacitors)
Transient Response (Vin=48V, Iout=50-75-50% of Imax)
(Recovery time=9.6uS)
Transient Response (Vin=48V, Iout=50-75-50% of Imax)
(Recovery time=10uS)
Transient Response (Vin=48V, Iout=50-75-50% of Imax)
Thermal image with hot spot at full load with 85 °C ambient; air is flowing at 400LFM. Air
if flowing across the converter from +V to -V at 48V input. Identifiable and recommended
value to be verified in application. (Q2, max temp=120 °C/IPC9592 guidelines)
www.murata-ps.com/support
MDC_ULS Series.C07 Page 10 of 24
ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
FUNCTIONAL SPECIFICATIONS, ULS-12/5-D48*
ABSOLUTE MAXIMUM RATINGS
Input Voltage, Continuous
Input Voltage, Transient
Isolation Voltage
Input Reverse Polarity
On/Off Remote Control
Output Power
Conditions ➀
Full power operation
Operating or non-operating, tested:
100 mS max. duration
Input to output
None, install external fuse
Power on, referred to -Vin
Minimum
Typical/Nominal
Maximum
80
Units
Vdc
100
Vdc
2250
Vdc
Vdc
Vdc
W
None
0
0
15
60.6
Current-limited, no damage,
0
5
A
short-circuit protected
Storage Temperature Range
Vin = Zero (no power)
-55
125
°C
Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other
than those listed in the Performance/Functional Specifications Table is not implied or recommended.
INPUT
Operating voltage range
36
48
75
Vdc
Recommended External Fuse
Fast blow
4
A
Start-up threshold, turn on
Rising input voltage
33
34.5
35.5
Vdc
Falling input voltage
31
32.5
33.5
Vdc
Undervoltage shutdown, turn off 12
Overvoltage protection
NA
Vdc
Reverse Polarity Protection
None, install external fuse
None
Vdc
Internal Filter Type
Capacitance
Output Current
Input current
Full Load Conditions
Low Line
Inrush Transient
Output in Short Circuit
No Load input current
Shut-Down Mode Input Current (TH)
Shut-Down Mode Input Current (SMT)
Reflected (back) ripple current ➁
Reflected (back) ripple current ➁
Vin = nominal
Vin = minimum
1.37
1.83
0.05
100
50
15
15
150
15
Iout = minimum, unit=ON
no filtering
Measured at input with specified filter
1.43
1.89
200
150
25
20
200
30
A
A
A2-Sec.
mA
mA
mA
mA
mAp-p
mAp-p
GENERAL and SAFETY
Vin=48V, full load
Vin=Min (TH)
Vin=Min (SMT)
Efficiency
88
89
89
Isolation
Isolation Voltage, input to output
Insulation Safety Rating
Isolation Resistance
Isolation Capacitance (TH)
Isolation Capacitance (SMT)
Safety (meets the following requirements)
Calculated MTBF
Calculated MTBF ➃
91
90
91.5
%
%
%
2250
basic
100
1000
1500
UL-60950-1, CSA-C22.2 No.60950-1,
IEC/EN60950-1, 2nd Edition
Per MIL-HDBK-217F, ground benign,
Tambient=+40°C
Per Telcordia SR332, issue 1, class 3, ground
fixed, Tambient=+40°C
Vdc
MΩ
pF
pF
Yes
TBD
Hours x 103
3200
Hours x 103
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
Startup Time
Startup Time (TH)
Startup Time (SMT)
470
19
Dynamic Load Response
Dynamic Load Peak Deviation
Power on, Vout regulated
Remote ON to Vout regulated
Remote ON to Vout regulated
50-75-50% load step, settling time to within
1% of Vout.
same as above
520
570
30
30
20
KHz
mS
mS
mS
25
50
µSec
±180
±240
mV
*NOTE: The ULS-12/5-D48NM-C (SMT version) contains ceramic capacitors. No tantalum capacitors are used.
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MDC_ULS Series.C07 Page 11 of 24
ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
FUNCTIONAL SPECIFICATIONS, ULS-12/5-D48 (CONT.)
FEATURES and OPTIONS
Remote On/Off Control
“N” suffix:
Negative Logic, ON state
Negative Logic, OFF state
Control Current
“P” suffix:
Positive Logic, ON state
Positive Logic, OFF state
Control Current
Conditions ➀
Minimum
Typical/Nominal
Maximum
Units
ON = Pin grounded or external voltage
OFF = Pin open or external voltage
open collector/drain
-0.1
2.5
1
0.8
15
2
V
V
mA
ON = Pin open or external voltage
OFF = Ground pin or external voltage
open collector/drain
3.5
0
1
15
1
2
V
V
mA
0
60
60.6
W
11.88
-1
-10
-15
13.3
12
12.12
1
10
10
18
Vdc
% of Vset
5
A
8
A
OUTPUT
Total Output Power
Voltage
Nominal Output Voltage ➂ 15
Settling Accuracy
Output Voltage Range (TH) ➇
Output Voltage Range (SMT) ➇
Overvoltage Protection
Remote Sense Compensation
Current
Output Current Range
Minimum Load
Current Limit Inception 13
Short Circuit ➄
No trim 18
At 50% load
User-adjustable
User-adjustable
Via magnetic feedback
Of Vset
0
98% of Vnom., after warm up
Short Circuit Current
Short Circuit Duration
(remove short for recovery)
Short circuit protection method
Regulation
Line Regulation ➆
Load Regulation ➆
Ripple and Noise
Temperature Coefficient
Maximum Capacitive Loading
(10% ceramic, 90% Oscon)
Maximum Capacitive Loading
5.5
14.5
10
5
No minimum load
6.8
Hiccup technique, autorecovery within ±1%
of Vout
0.6
Output shorted to ground, no damage
Continuous
Vdc
%
A
Hiccup current limiting
Vin=min. to max., Vout=nom., nom load
Iout=min. to max
5 Hz- 20 MHz BW
At all outputs
±0.125
±0.25
80
0.02
Low ESR, .02 ohms max (resistive load)
1000
120
V
V
mV pk-pk
% of Vout./°C
μF
loads: CC mode
μF
MECHANICAL (Through Hole Models)
Cxx case
WxLxH
Outline Dimensions
(Please refer to outline drawing)
1.3x0.9x0.4
33x22.9x10.2
0.58
16.4
.062 & .04
1.575 & 1.016
Gold-plated copper
alloy with nickel
underplate
50
5
Weight
Through Hole Pin Diameter
Through Hole Pin Material
Nickel subplate
Gold overplate
TH Pin Plating Metal and Thickness
Inches
mm
Ounces
Grams
Inches
mm
µ-inches
µ-inches
ENVIRONMENTAL
Operating Ambient Temperature Range
11
Storage Temperature
Operating Case Temp
Thermal Protection/Shutdown
Electromagnetic Interference
Conducted, EN55022/CISPR22
Radiated, EN55022/CISPR22
RoHS rating
No derating, full power, 200 LFM,
no condensation
Vin = Zero (no power)
No derating required
Measured at hotspot
External filter is required
-40
85
°C
-55
-40
115
125
105
130
°C
°C
°C
125
B
B
RoHS-6
Class
Class
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MDC_ULS Series.C07 Page 12 of 24
ULS 60-Watt Series
Performance Specification Notes
➀ All specifications are typical unless noted. Ambient temperature =
+25°Celsius, Vin is nominal, output current is maximum rated nominal.
External output capacitance is 1 µF multilayer ceramic paralleled with
10 µF electrolytic. All caps are low ESR. These capacitors are necessary for
our test equipment and may not be needed in your application.
Testing must be kept short enough that the converter does not appreciably
heat up during testing. For extended testing, use plenty of airflow. See
Derating Curves for temperature performance. All models are stable and
regulate within spec without external cacacitance.
➁
➂
➃
Input Ripple Current is tested and specified over a 5-20 MHz bandwidth
and uses a special set of external filters only for the Ripple Current specifications. Input filtering is Cin = 33 µF, Cbus = 220 µF, Lbus = 12 µH. Use
capacitor rated voltages which are twice the maximum expected voltage.
Capacitors must accept high speed AC switching currents.
Note that Maximum Current Derating Curves indicate an average current
at nominal input voltage. At higher temperatures and/or lower airflow, the
converter will tolerate brief full current outputs if the average RMS current
over time does not exceed the Derating curve. All Derating curves are
presented at sea level altitude. Be aware of reduced power dissipation
with increasing density altitude.
Mean Time Before Failure (MTBF) is calculated using the Telcordia
(Belcore) SR-332 Method 1, Case 3, Issue 1, ground fixed conditions. Operating temperature = +30°C, full output load, natural air convection.
➄
The output may be shorted to ground indefinitely with no damage. The
Output Short Circuit Current shown in the specifications is an average consisting of very short bursts of full rated current to test whether the output
circuit can be repowered.
➅
The On/Off Control is normally driven from a switch or relay. An open
collector/open drain transistor may be used in saturation and cut-off
(pinch-off) modes. External logic may also be used if voltage levels are
fully compliant to the specifications.
➆
Regulation specifications describe the deviation as the input line voltage
or output load current is varied from a nominal midpoint value to either
extreme (50% load).
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
➇ Do not exceed maximum power ratings, Sense limits or output overvoltage
when adjusting output trim values.
➈ At zero output current, Vout may contain components which slightly
exceed the ripple and noise specifications.
➉ Output overload protection is non-latching. When the output overload
is removed, the output will automatically recover.
11
12
13
14
15
16
17
18
19
All models are fully operational and meet published specifications,
including “cold start” at –40°C.
The converter will shut off if the input falls below the undervoltage threshold. It will not restart until the input exceeds the Input Start Up Voltage.
Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting.
Output noise may be further reduced by installing an external filter. See
the Application Notes. Use only as much output filtering as needed and no
more. Larger caps (especially low-ESR ceramic types) may slow transient
response or degrade dynamic performance. Thoroughly test your application with all components installed.
To avoid damage or unplanned shutdown, do not sink appreciable reverse
output current.
If reverse polarity is accidentally applied to the input, always connect an
external fast blow input fuse in series with the +Vin input.
Although extremely unlikely, failure of the internal components of this
product may expose external application circuits to dangerous voltages,
currents, temperatures or power levels. Please thoroughly verify all applications before committing them to service. Be sure to include appropriately rated FUSES (see specifications and Application Notes) to reduce the
risk of failure.
If Sense is not wired to an external load, connect sense pins to their
respective Vout pins. Do not leave sense unconnected.
All models use fixed switching frequencies.
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MDC_ULS Series.C07 Page 13 of 24
ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
TYPICAL PERFORMANCE DATA, ULS-12/5-D48
Efficiency and Power Dissipation vs. Line Voltage and Load Current @ 25°C
Maximum Current Temperature Derating at Sea Level
(Vin = 48V, airflow is from Vin to Vout)
90
10
9
85
80
8
VIN = 75V
VIN = 48V
VIN = 36V
75
70
7
6
5
65
60
Power Dissipation
(Vin = 48V)
55
50
0.50
0.95
1.40
1.85
2.30
2.75
3.20
3.65
4.10
4.55
6
4
3
2
5.00
Output Current (Amps)
11
Loss (Watts)
12
95
Efficiency (%)
100
5
4
Natural convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
3
2
1
0
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (ºC)
Load Current (Amps)
Enable Start-up (Vin=48V, Iout=5A, Ta=+25°C) Trace 2=Output, Trace 4= Enable.
Enable Start-up (Vin=48V, Iout=0A, Ta=+25°C) Trace 2=Output, Trace 4= Enable.
Enable Start-up (Vin=48V, Iout=5A, Cload=1000uF Ta=+25°C) Trace 2=Output,
Trace 4= Enable.
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MDC_ULS Series.C07 Page 14 of 24
ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
TYPICAL PERFORMANCE DATA, ULS-12/5-D48 (CONT.)
Output and Ripple Noise (Vin=48V, Iout=0A, 1uF Ceramic and 10uF tantalum capacitors)
Output and Ripple Noise (Vin=48V, Iout=5A, 1uF Ceramic and 10uF tantalum capacitors)
Transient Response (Vin=48V, Iout=50-75-50% of Imax)
(Delta=170mv, Recovery time=16uS)
Transient Response (Vin=48V, Iout=50-75-50% of Imax)
(-Delta=183.12mV, Recovery time=18.2uS)
Transient Response (Vin=48V, Iout=50-75-50% of Imax)
Thermal image with hot spot at full load with 85 °C ambient; air is flowing at 400LFM. Air
if flowing across the converter from -V to +V at 48V input. Identifiable and recommended
value to be verified in application. (Q2, max temp=120 °C/IPC9592 guidelines)
www.murata-ps.com/support
MDC_ULS Series.C07 Page 15 of 24
ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
MECHANICAL SPECIFICATIONS, THROUGH-HOLE MOUNT
TOP VIEW
Pin
3
2
1
INPUT/OUTPUT CONNECTIONS P75
Function
Pin
Function
-Vin
4
-Vout
5
–Sense In
On/Off Control 6
Trim
7
+Sense In
+Vin
8
+Vout
0.136 ±0.005
0.030 (0.8) Min
0.145 0.400 (10.16) Max
(3.68)
Important! Always connect the sense pins. If they
are not connected to a remote load, wire each
sense pin to its respective voltage output at the
converter pins.
The 0.145-inch pin length is shown. Please refer to
the part number structure for alternate pin lengths.
Pin material: Copper alloy. Plating: Gold over nickel
SIDE VIEW
Please note that some competitive units may use
different pin numbering or alternate outline views;
however, all units are plugin-compatible.
PINS 1-3,5-7:
φ0.040±0.001(1.016±0.025)
1.100 (27.9)
PINS 4,8:
φ0.062±0.001(1.575±0.025)
It is recommended that no parts be placed beneath
the converter
0.100 ±0.005 2X
0.078 ±0.005 6X
BOTTOM PIN VIEW
1.30 (33.0)
END VIEW
Dimensions are in inches (mm) shown for ref. only.
4
6
0.90 (22.9)
2
Third Angle Projection
0.300 (7.62)
5
0.600 (15.24)
0.600 (15.24)
3
7
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
8
1
RECOMMENDED FOOTPRINT
(VIEW THROUGH CONVERTER)
FINISHED HOLE SIZES
@ PINS 1-3, 6, 5, 7
(PRI)
(PER IPC-D-275, LEVEL C)
1.100
[27.94]
.048-.062
22.9
.90
Components are shown for reference only
and may vary between units.
TOP VIEW
11.7
.46
CL
3.81
.150
8
1
7.62
.300
7
2
6
7.62
.300
5
3
.100 MIN
ANNULAR RING
FOR ALL PIN
SHOULDERS
(SEC)
4
14.0
.55
CL
33
1.30
CL
3.81
.150
FINISHED HOLE SIZES
@ PINS 4 & 8
(PER IPC-D-275, LEVEL C)
.070-.084
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MDC_ULS Series.C07 Page 16 of 24
ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
SHIPPING TRAYS AND BOXES, THROUGH-HOLE MOUNT
Anti-static foam
Corner spacer
2 cartons
per box
79
(
12.
128
6 (3
ts
uni
ts
uni
Each tray is 4 x 8 units
(32 units total per tray)
20)
128 units
per carton
11.42 (290)
13.
)
350
128
Label
256 units total per box
All materials in contact with the units are anti-static protective.
Dimensions are in inches (mm).
Corrugated
cardboard box
Label
SHIPPING TRAY DIMENSIONS
Material: Low density, closed cell polyethylene anti-static foam
9.84
(250.00)
0.24
(6.00)
9.84
(250.00)
0.47
(12.00)
4-C 0.26
(6.5)
0.87
(22.00)
0.59
(15.00)
Dimensions are in milimeters.
1
.3
R0 .00)
(8
Tolerances (unless otherwise specified):
.XX ± 0.5
.XXX ± 0.25
Angles ± 2˚
1.34
(34.00)
1.97
(50.00)
0.31
(8.00)
0.51
(13.00)
0.91
(23.00)
Third Angle Projection
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MDC_ULS Series.C07 Page 17 of 24
ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
MECHANICAL SPECIFICATIONS, SURFACE MOUNT (MSL = 3)
TOP VIEW
Pin
3
2
1
INPUT/OUTPUT CONNECTIONS P75
Function
Pin
Function
-Vin
4
-Vout
5
–Sense In
On/Off Control 6
Trim
7
+Sense In
+Vin
8
+Vout
0.400 (10.16) Max
0.150 (3.8)
Important! Always connect the sense pins. If they
are not connected to a remote load, wire each
sense pin to its respective voltage output at the
converter pins.
Pin material: Copper alloy. Plating: Gold over nickel
SIDE VIEW
0.020 (0.5) Min
Please note that some competitive units may use
different pin numbering or alternate outline views;
however, all units are plugin-compatible.
0.062
(1.575)
1.100 (27.9)
It is recommended that no parts be placed beneath
the converter
BOTTOM PIN VIEW
1.30 (33.0)
END VIEW
Dimensions are in inches (mm) shown for ref. only.
4
6
0.90 (22.9)
2
Third Angle Projection
0.300 (7.62)
5
0.600 (15.24)
0.600 (15.24)
3
7
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
8
1
RECOMMENDED FOOTPRINT
Components are shown for reference only
and may vary between units.
(VIEW THROUGH CONVERTER)
TOP VIEW
(PRI)
(SEC)
27.94
1.100
22.9
.90
11.7
.46
CL
3.81
.150
8
1
7.62
.300
7
2
6
7.62
.300
5
3
4
14.0
.55
CL
33
1.30
CL
3.81
.150
.070 MIN PAD
(6 OR 8 PLACES
AS REQUIRED)
www.murata-ps.com/support
MDC_ULS Series.C07 Page 18 of 24
ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
TAPE AND REEL INFORMATION
330.20
13.00
TAPE AND REEL
(200 UNITS
PER REEL)
13.00
.512
101.60
4.00
CORE
44.0
1.73
REF
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 1˚
Components are shown for reference only.
www.murata-ps.com/support
MDC_ULS Series.C07 Page 19 of 24
ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
TECHNICAL NOTES
Input Fusing
Certain applications and/or safety agencies may require the installation of
fuses at the inputs of power conversion components. Fuses should also be
used if the possibility of sustained, non-current-limited, input-voltage polarity
reversals exists. For DATEL ULS series DC/DC converters, we recommend the
use of a fast blow fuse, installed in the ungrounded input supply line with a
typical value about twice the maximum input current, calculated at low line
with the converter’s minimum efficiency.
All relevant national and international safety standards and regulations must
be observed by the installer. For system safety agency approvals, the converters must be installed in compliance with the requirements of the end- use
safety standard.
Input Reverse-Polarity Protection
If the input voltage polarity is accidentally reversed, an internal diode will
become forward biased and likely draw excessive current from the power
source. If this source is not current limited or the circuit appropriately fused, it
could cause permanent damage to the converter.
Pre-Bias Protection
For applications where a pre-bias potential can be present at the output of the
power module it is recommended that either blocking diodes are added in series
with the Vout power lines or, a preferred solution is to use an OR-ing FET controller like the LM5050-1 High-Side & LM5051 Low-Side OR-ing FET Controller from
TI. Starting the module into a pre-bias condition can cause permanent damage
to the module.
Input Under-Voltage Shutdown and Start-Up Threshold
Under normal start-up conditions, devices will not begin to regulate properly
until the ramping-up input voltage exceeds the Start-Up Threshold Voltage.
Once operating, devices will not turn off until the input voltage drops below the
Under-Voltage Shutdown limit. Subsequent re-start will not occur until the input
is brought back up to the Start-Up Threshold. This built in hysteresis prevents
any unstable on/off situations from occurring at a single input voltage.
Start-Up Time
The VIN to VOUT Start-Up Time is the time interval between the point at which
the ramping input voltage crosses the Start-Up Threshold and the fully loaded
output voltage enters and remains within its specified accuracy band. Actual
measured times will vary with input source impedance, external input capacitance, and the slew rate and final value of the input voltage as it appears at the
converter. The ULS Series implements a soft start circuit to limit the duty cycle
of its PWM controller at power up, thereby limiting the input inrush current.
The On/Off Control to VOUT start-up time assumes the converter has its
nominal input voltage applied but is turned off via the On/Off Control pin. The
specification defines the interval between the point at which the converter is
turned on (released) and the fully loaded output voltage enters and remains
within its specified accuracy band. Similar to the VIN to VOUT start-up, the On/Off
Control to VOUT start-up time is also governed by the internal soft start circuitry
and external load capacitance. The difference in start up time from VIN to VOUT
and from On/Off Control to VOUT is therefore insignificant.
Input Source Impedance
The input of ULS converters must be driven from a low ac-impedance source.
The DC/DC’s performance and stability can be compromised by the use of
highly inductive source impedances. The input circuit shown in Figure 3 is a
practical solution that can be used to minimize the effects of inductance in the
input traces. For optimum performance, components should be mounted close
to the DC/DC converter.
I/O Filtering, Input Ripple Current, and Output Noise
All models in the ULS Series are tested/specified for input reflected ripple
current and output noise using the specified external input/output components/
circuits and layout as shown in the following two figures. External input capacitors (CIN in Figure 3) serve primarily as energy-storage elements, minimizing line voltage variations caused by transient IR drops in conductors from
backplane to the DC/DC. Input caps should be selected for bulk capacitance
(at appropriate frequencies), low ESR, and high rms-ripple-current ratings. The
switching nature of DC/DC converters requires that dc voltage sources have
low ac impedance as highly inductive source impedance can affect system stability. In Figure 3, CBUS and LBUS simulate a typical dc voltage bus. Your specific
system configuration may necessitate additional considerations.
TO
OSCILLOSCOPE
CURRENT
PROBE
+
VIN
+VIN
LBUS
CBUS
CIN
–
–VIN
CIN = 33µF, ESR < 700mΩ @ 100kHz
CBUS = 220µF, ESR < 100mΩ @ 100kHz
LBUS = 12µH
Figure 3. Measuring Input Ripple Current
In critical applications, output ripple/noise (also referred to as periodic and
random deviations or PARD) may be reduced below specified limits using filtering techniques, the simplest of which is the installation of additional external
output capacitors. They function as true filter elements and should be selected
for bulk capacitance, low ESR and appropriate frequency response.
All external capacitors should have appropriate voltage ratings and be
located as close to the converter as possible. Temperature variations for all
relevant parameters should also be taken carefully into consideration. The most
effective combination of external I/O capacitors will be a function of line voltage
and source impedance, as well as particular load and layout conditions.
+SENSE
+VOUT
C1
C2
SCOPE
RLOAD
–VOUT
–SENSE
C1 = 1µF
C2 = 10µF
LOAD 2-3 INCHES (51-76mm) FROM MODULE
Figure 4. Measuring Output Ripple/Noise (PARD)
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MDC_ULS Series.C07 Page 20 of 24
ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
Floating Outputs
Since these are isolated DC/DC converters, their outputs are “floating” with
respect to their input. Designers will normally use the –Output as the ground/
return of the load circuit. You can however, use the +Output as ground/return to
effectively reverse the output polarity.
Minimum Output Loading Requirements
ULS converters employ a synchronous-rectifier design topology and all models
regulate within spec and are stable under no-load to full load conditions.
Operation under no-load conditions however might slightly increase the output
ripple and noise.
Thermal Shutdown
The ULS converters are equipped with thermal-shutdown circuitry. If environmental conditions cause the temperature of the DC/DC converter to rise above
the designed operating temperature, a precision temperature sensor will power
down the unit. When the internal temperature decreases below the threshold
of the temperature sensor, the unit will self start. See Performance/Functional
Specifications.
Output Over-Voltage Protection
The ULS output voltage is monitored for an over-voltage condition using a comparator. The signal is optically coupled to the primary side and if the output voltage rises to a level which could be damaging to the load, the sensing circuitry
will power down the PWM controller causing the output voltage to decrease.
Following a time-out period the PWM will restart, causing the output voltage
to ramp to its appropriate value. If the fault condition persists, and the output
voltage again climbs to excessive levels, the over-voltage circuitry will initiate
another shutdown cycle. This on/off cycling is referred to as “hiccup” mode.
Current Limiting
As soon as the output current increases to approximately 130% of its rated
value, the DC/DC converter will go into a current-limiting mode. In this condition, the output voltage will decrease proportionately with increases in output
current, thereby maintaining somewhat constant power dissipation. This is
commonly referred to as power limiting. Current limit inception is defined
as the point at which the full-power output voltage falls below the specified
tolerance. See Performance/Functional Specifications. If the load current, being
drawn from the converter, is significant enough, the unit will go into a short
circuit condition as described below.
Short Circuit Condition
When a converter is in current-limit mode, the output voltage will drop as the
output current demand increases. If the output voltage drops too low, the magnetically coupled voltage used to develop primary side voltages will also drop,
thereby shutting down the PWM controller. Following a time-out period, the
PWM will restart causing the output voltage to begin ramping to their appropriate value. If the short-circuit condition persists, another shutdown cycle will be
initiated. This on/off cycling is referred to as “hiccup” mode. The hiccup cycling
reduces the average output current, thereby preventing internal temperatures
from rising to excessive levels. The ULS Series is capable of enduring an indefinite short circuit output condition.
Remote Sense
Note: The Sense and VOUT lines are internally connected through low-value
resistors. Nevertheless, if the sense function is not used for remote regulation
the user should connect the +Sense to +VOUT and –Sense to –VOUT at the DC/
DC converter pins. ULS series converters employ a sense feature to provide
point of use regulation, thereby overcoming moderate IR drops in PCB conductors or cabling. The remote sense lines carry very little current and therefore
require minimal cross-sectional-area conductors. The sense lines, which are
capacitively coupled to their respective output lines, are used by the feedback
control-loop to regulate the output. As such, they are not low impedance points
and must be treated with care in layouts and cabling. Sense lines on a PCB
should be run adjacent to dc signals, preferably ground.
[VOUT(+)-VOUT(–)] – [Sense(+)-Sense(–)] ≤ 10%VOUT
In cables and discrete wiring applications, twisted pair or other techniques
should be used. Output over-voltage protection is monitored at the output voltage pin, not the Sense pin. Therefore, excessive voltage differences between
VOUT and Sense in conjunction with trim adjustment of the output voltage can
cause the over-voltage protection circuitry to activate (see Performance Specifications for over-voltage limits). Power derating is based on maximum output
current and voltage at the converter’s output pins. Use of trim and sense functions can cause output voltages to increase, thereby increasing output power
beyond the converter’s specified rating, or cause output voltages to climb into
the output over-voltage region. Therefore, the designer must ensure:
(VOUT at pins) x (IOUT) ≤ rated output power
Contact and PCB resistance
losses due to IR drops
+VOUT
+VIN
IOUT
+SENSE
Sense Current
ON/OFF
CONTROL
TRIM
LOAD
Sense Return
–SENSE
IOUT Return
–VIN
–VOUT
Contact and PCB resistance
losses due to IR drops
Figure 5. Remote Sense Circuit Configuration
On/Off Control
The input-side, remote On/Off Control function can be ordered to operate with
either logic type:
Positive ("P" suffix) logic models are enabled when the on/off pin is left
open (or is pulled high, applying +3.5V to +15V with respect to –Input) as per
Figure 6. Positive-logic devices are disabled when the on/off pin is pulled low
(0 to 1V with respect to –Input).
Negative (“N” suffix) logic devices are off when pin is left open (or pulled
high, applying +2.5V to +15V), and on when pin is pulled low (–0.1 to +0.8V)
with respect to –Input as shown in Figure 6.
www.murata-ps.com/support
MDC_ULS Series.C07 Page 21 of 24
ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
Dynamic control of the remote on/off function is best accomplished with a
mechanical relay or an open-collector/open-drain drive circuit (optically isolated
if appropriate). The drive circuit should be able to sink appropriate current (see
Performance Specifications) when activated and withstand appropriate voltage
when deactivated. Applying an external voltage to pin 2 when no input power is
applied to the converter can cause permanent damage to the converter.
+VIN
+Vcc
13V CIRCUIT
ON/OFF
CONTROL
5V CIRCUIT
–VIN
Figure 6. Driving the Negative Logic On/Off Control Pin
(simplified circuit)
OUTPUT VOLTAGE ADJUSTMENT
Trim Equations
511
RT DOWN (kΩ) =
Where ∆% =
|( V
∆%
+VOUT
+VIN
Trim Down
– 10.22
– VDES
× 100
VNOM
NOM
+SENSE
)|
ON/OFF
CONTROL
Trim Up
RT UP (kΩ) =
5.11 × VNOM × (100 + ∆%)
1.225 × ∆%
TRIM
LOAD
RTRIM UP
–SENSE
–
511
∆%
Note: “∆%” is always a positive value.
“VNOM” is the nominal, rated output voltage.
“VDES” is the desired, changed output voltage.
– 10.22
–VIN
–VOUT
Figure 7. Trim Connections To Increase Output Voltages
Connect sense to its respective Vout pin if sense is not used with a remote load.
+VOUT
+VIN
+SENSE
ON/OFF
CONTROL
RTRIM DOWN
TRIM
LOAD
–SENSE
–VIN
–VOUT
Figure 8. Trim Connections To Decrease Output Voltages
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MDC_ULS Series.C07 Page 22 of 24
ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
Trimming by Using an External Voltage Source
1. The easiest way to trim the output using an external voltage source is to
drive the Trim pin directly from a variable source. The following equation can
be used to calculate the voltage at the Trim pin.
Vo is the output voltage you want; Vonominal is the nominal output voltage;
Vtrim = 2 x 1.225 x
Vo
Vonominal
− 1.225
Vtrim is the voltage that should appear at the trim pin.
2. If the purpose of trimming is to compensate voltage drop of power path
from converter to the Load, you may separately connect the sense pin directly
to the load. It’s much easier than real time adjusting trim voltage.
3. CAUTION: To avoid unplanned power down cycles, do not exceed EITHER
the maximum output voltage OR the maximum output power when setting
the trim. If the output voltage is excessive, the OVP circuit may shut down the
converter. If the maximum power is exceeded, the converter may enter current
limiting. If the power is exceeded for an extended period, the converter may
overheat and encounter overtemperature shut down. Be careful of external
electrical noise. The Trim input is a sensitive input to the converter’s feedback
control loop. Excessive electrical noise may cause instability or oscillation.
+VIN
+VOUT
External
source
+SENSE
ON/OFF
CONTROL
TRIM
+
–
LOAD
–SENSE
–VIN
–VOUT
Figure 9. Trimming with an External Source
Through-hole Soldering Guidelines
SMT Reflow Soldering Guidelines
Murata Power Solutions recommends the TH soldering specifications below when installing these converters. These specifications vary depending on the solder type. Exceeding
these specifications may cause damage to the product. Your production environment may
differ; therefore please thoroughly review these guidelines with your process engineers.
The surface-mount reflow solder profile shown below is suitable for SAC305 type leadfree solders. This graph should be used only as a guideline. Many other factors influence
the success of SMT reflow soldering. Since your production environment may differ,
please thoroughly review these guidelines with your process engineers.
Wave Solder Operations for through-hole mounted
products (THMT)
For Sn/Ag/Cu based solders:
Maximum Preheat Temperature
115° C.
Maximum Pot Temperature
270° C.
Maximum Solder Dwell Time
7 seconds
For Sn/Pb based solders:
Maximum Preheat Temperature
105° C.
Maximum Pot Temperature
250° C.
Maximum Solder Dwell Time
6 seconds
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MDC_ULS Series.C07 Page 23 of 24
ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
IR Transparent
optical window
Unit under
test (UUT)
IR Video
Camera
Precision
low-rate
anemometer
3” below UUT
Ambient
temperature
sensor
Airflow
collimator
Vertical Wind Tunnel
Murata Power Solutions employs a computer controlled custom-designed closed loop vertical wind tunnel, infrared video
camera system, and test instrumentation for accurate airflow
and heat dissipation analysis of power products. The system
includes a precision low flow-rate anemometer, variable
speed fan, power supply input and load controls, temperature
Variable
gauges, and adjustable heating element.
speed fan
The IR camera monitors the thermal performance of the
Unit Under Test (UUT) under static steady-state conditions. A
special optical port is used which is transparent to infrared
wavelengths.
Both through-hole and surface mount converters are soldered down to a host carrier board for realistic heat absorption and spreading. Both longitudinal and transverse airflow
studies are possible by rotation of this carrier board since
there are often significant differences in the heat dissipation
Heating
in the two airflow directions. The combination of adjustable
element
airflow, adjustable ambient heat, and adjustable Input/Output
currents and voltages mean that a very wide range of measurement conditions can be studied.
The collimator reduces the amount of turbulence adjacent
to the UUT by minimizing airflow turbulence. Such turbulence
influences the effective heat transfer characteristics and gives
false readings. Excess turbulence removes more heat from
some surfaces and less heat from others, possibly causing
uneven overheating.
Both sides of the UUT are studied since there are different thermal gradients on each side. The adjustable heating
element and fan, built-in temperature gauges, and no-contact IR
camera mean that power supplies are tested in real-world conditions.
Figure 10. Vertical Wind Tunnel
Murata Power Solutions, Inc.
129 Flanders Road, Westborough, MA 01581 U.S.A.
ISO 9001 and 14001 REGISTERED
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: http://www.murata-ps.com/requirements/
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change
without notice.
© 2019 Murata Power Solutions, Inc.
www.murata-ps.com/support
MDC_ULS Series.C07 Page 24 of 24
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