EK17
Evaluation Kit
APPLICABLE PARTS (SOLD SEPARATELY)
•
SA12 PWM Amplifier
INTRODUCTION
This easy-to-use kit provides a platform for the evaluation of PWM amplifiers using the SA12 pin-out configuration. It can be used to analyze a multitude of standard or proprietary circuit configurations, and is flexible enough to do most standard amplifier test configurations.
The schematic is shown in Figure 2. Note that all of the components shown on the schematic will probably not be used for any single circuit. Some components will simply be omitted, while others require installation of a jumper to complete the signal path.
Only components unique to the EK17 are provided in this kit. Hardware similar to that shown in Figure 4
must be obtained locally.
Figure 1: PCB
TOP SIDE
TB1
M I C R O T E C H N O L O G Y
EVAL19 R
COMPONENT SIDE
+
PWR
GND
+
B OUT
+Vs
A OUT
Vcc
12
7
Rb
Ra
R1
IC
CVs1
CVs3
4.686
CVcc
CVs2
R2
Vcc SIG
GND
C3
R3
D1
SHDN
SIG
GND
1
6
J1
C2
IC
C1
RAMP/-PWM
OR
FLAG
SIG
GND
R4
SPARE
+PWM
SPARE
5.500
BOTTOM SIDE
1
6
CIRCUIT DUT SIDE
EVAL19
www.apexanalog.com
© Apex Microtechnology Inc.
All rights reserved
Jan 2016
EK17U Rev I
EK17
Figure 2: PCB Schematic
A block diagram of the SA12 is shown in Figure 2 along with pcb connections of all the commonly used
external components. Your application circuit will not use all of the components. Add those components
required by your circuit. You may have to jumper some components to make the desired electrical connections. J1 is an optional way to connect the clock circuit. Power supply bypassing is particularly important and
that is why high quality ceramic chip capacitors are supplied with the kit. In addition, a large electrolytic
capacitor is included. This capacitor was selected expressly for this evaluation kit and may not be (and likely
won't be) suitable for your end application. You will need to select an electrolytic capacitor based on your
analysis of the capacitor's ripple current, ripple current tolerance, operating temperature, operating voltage,
acceptable service life and acceptable supply ripple. Note that the signal ground and power ground are separated and tie together only at the ground pin (5). A breadboarding area is supplied which can accommodate 1
or 2 IC amplifiers and associated components. The large terminal pads can be used to solder wire connections
or banana jacks.
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EK17U Rev I
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Figure 3: Functional Test Circuit
ϱϬё͕Ϯϱt
Dummy Load
15V
200mA
Supply
VCC
A OUT
CVcc
1μF
RQ
Ϭ͘Ϯё
R2
12
30V High
Amp
Supply
5k
B OUT
CVs
680μF
11
ISENSE A
+VS
9
10
A OUT
VCC
RB
Ϭ͘Ϯё
R1
5k
+VS
8
7
ISENSE B
B OUT
5V
10V
H BRIDGE DRIVER
0.1V 10V
1k
1000pF
50
50 k
VCC
910
.01μF
SA12
5V
TL
10V
28.1K
100pF
5V
f/2
CLOCK
CLK IN
1
J1
CLK OUT
+PWM
2
3
C2
.01μF
RAMP/
-PWM
4
CL/
SHDN
GND
5
6
C3
.01μF
5k
D1
50
+PWM RAMP/-PWM SIG
OR FLAG GND
PWR
GND
CL/SHDN
1 Hz Sine Wave
+3/+7 V Amplitude
Valley to Peak
The schematic of Figure 3 can be used to verify the functionality of your amplifier and help you gain a
familiarity with proper operation. At either A Out or B Out, with respect to ground, you should observe a
square wave approximately 30 V in amplitude with a fixed frequency and duty cycle that varies from approximately 0 to 100% at a rate of 1 Hz. The current limit is set to 10 amps.
EK17U Rev I
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EK17
PARTS LIST
Reference
Manufacturer Part #
Description
HS18
Heatsink
364015151327100
Pin Receptacle-0.048-0.064 Dia
EVAL19
PC Board
1
60SPG00001
Spacer Grommets
4
1 Box (10 each)
QTY
1
1 Bag (12 each)
TW05
Thermal Washer
1825B105K201N
Cap, 1µF, 200V, 10%-R
3
TS01
Terminal Strip 66505, Beau
1
KMH200VN68IM25X40T2
680 µf Cap, United Chemi-Con
1
HS22
Heatsink, Thermalloy 6025B
2
RA, RB
MP916-0.010-5%
0.01 Ω resistor, Caddock
2
RA, RB
MP930-0.020-5%
0.02 Ω resistor, Caddock
2
C1, C2, C3
CvS
BEFORE YOU GET STARTED
•
•
•
•
•
•
•
All Apex Microtechnology amplifiers should be handled using proper ESD precautions.
Always use the heatsink included in this kit with TW05 washer.
Always use adequate power supply bypassing.
Do not change connections while the circuit is powered.
Initially set all power supplies to the minimum operating allowed in the device data sheet.
Check for oscillations
Refer to Application Note 1, “General Operating Considerations.”
ASSEMBLY
During assembly refer to Figures 1 & 2
1. From the DUT of the PCB insert and solder the 12 cage jacks. Also solder the cage jacks from the circuit
side as well, making sure the cage jack remains flush with the component side of the PCB.
2. Solder the 3 surface mount ceramic capacitors to the component side of the PCB.
3. From the component side of the PCB insert the terminal strip. Solder from the circuit side of the PCB. Be
sure that the GND terminal hole in the PCB is fully filled with solder.
4. Two values of current limiting power resistors are supplied. Select one value (see the amplifier data sheet
to learn how to calculate which resistor will suit your need). Coat the backside of the power resistor with
heat sink compound (not supplied). Using 4-40 screws and nuts (not supplied) mount the resistors to the
two small heat sinks supplied. Solder the resistor/heat sink assembly to the component side of the PCB.
5. Insert the electrolytic capacitor into the PCB from the component side and solder from the circuit side
making sure to fill the mounting holes with solder.
6. From the circuit side, push spacer grommets into PCB until fully seated. Grommets will snug when screws
are inserted for heatsink mounting.
7. Apply TW05 thermal washer to the bottom of the amplifier.
8. Use #14 sleeving to insulate and align at least 2 opposite pins of the amplifier.
9. Mount amplifier to heatsink using #6 screws and nuts. Torque the part to the specified 8 to 10 in-lbs (0.9
to 1.13 N*m). Do not over torque.
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10. Install components as needed. External connections may be soldered directly or standard banana jacks
may be soldered to the large pads at the edge of the PCB.
11. Insert amplifier pins into cage jacks and fasten PCB to heatsink.
Figure 4: Mechanical Drawing
NEED TECHNICAL HELP? CONTACT APEX SUPPORT!
For all Apex Microtechnology product questions and inquiries, call toll free 800-546-2739 in North America. For
inquiries via email, please contact apex.support@apexanalog.com. International customers can also request
support by contacting their local Apex Microtechnology Sales Representative. To find the one nearest to you,
go to www.apexanalog.com
IMPORTANT NOTICE
Apex Microtechnology, Inc. has made every effort to insure the accuracy of the content contained in this document. However, the information is
subject to change without notice and is provided "AS IS" without warranty of any kind (expressed or implied). Apex Microtechnology reserves the right
to make changes without further notice to any specifications or products mentioned herein to improve reliability. This document is the property of
Apex Microtechnology and by furnishing this information, Apex Microtechnology grants no license, expressed or implied under any patents, mask
work rights, copyrights, trademarks, trade secrets or other intellectual property rights. Apex Microtechnology owns the copyrights associated with the
information contained herein and gives consent for copies to be made of the information only for use within your organization with respect to Apex
Microtechnology integrated circuits or other products of Apex Microtechnology. This consent does not extend to other copying such as copying for
general distribution, advertising or promotional purposes, or for creating any work for resale.
APEX MICROTECHNOLOGY PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN PRODUCTS USED FOR LIFE
SUPPORT, AUTOMOTIVE SAFETY, SECURITY DEVICES, OR OTHER CRITICAL APPLICATIONS. PRODUCTS IN SUCH APPLICATIONS ARE UNDERSTOOD TO BE
FULLY AT THE CUSTOMER OR THE CUSTOMER’S RISK.
Apex Microtechnology, Apex and Apex Precision Power are trademarks of Apex Microtechnology, Inc. All other corporate names noted herein may be
trademarks of their respective holders.
EK17U Rev I
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