AP3108L
HIGH-PERFORMANCE GREEN MODE PWM CONTROLLER
Description
Pin Assignments
The AP3108L is a Current Mode PWM controller specially designed
for offline power supply that requires ultra-low standby power, highpower density and comprehensive protection. The AP3108L
coordinating with Diodes’ secondary side controller, such as the
AP4320, can be applied in the situation that requires for constant CC
and constant CV.
(Top View)
The maximum switching frequency of the AP3108L is set at 65kHZ.
The switching frequency can be modulated through green mode, in
which it will smoothly decrease along with the decreasing load. This
will cause the minimum switching frequency to be clamped at about
22kHz to avoid audible noise.
The AP3108L provides an inner high-voltage start-up function through
HV pin which can save the use of the external start-up resistor,
reducing the standby loss. The HV pin also realizes X-CAP discharge
function. This is a useful function for power saving when an X-CAP is
connected to a system, for it will discharge the X-CAP when the AC
line voltage is off automatically without the need for extra discharge
resistors.
The AP3108L integrates a VCC LDO circuitry, allowing the LDO to
regulate the wide range VCC_IN, which is rectified from auxiliary
winding to an acceptable value. This makes the AP3108L a good
choice in wide range output voltage application.
There are also versatile system protections provided by AP3108L,
such as secondary side OVP, secondary side UVP, constant output
current limit, cycle-by-cycle current limit, brown-out protection,
programmable external OTP, etc.
SSOP-9 (Type CJ)
Applications
Switching AC-DC Adapter/Charger
Open Frame Switching Power Supply
Features
Current Mode Control
High-Voltage Startup
Embedded VCC LDO to Guarantee Wide Range Output Voltage
Constant, Low Output Current in Output Short Situation
Low VCC Charge Current Reduces Standby Power in Output
Short Situation
Non-Audible-Noise Green-Mode Control
Internal Slope Compensation
Soft Start During Startup Process
Frequency Fold Back for High Average Efficiency
Constant Over Current Protection(COCP)
VCC Maintain Mode
X-CAP Discharge Function
Precise Secondary Side OVP and UVP
Programmable External OTP
Brown-Out Protection
Overload Protection
FOCP and SSCP Protection
Useful Pin Fault Protection
SSOP-9 (Type CJ) is Available
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.
2. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain
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