Diodes Incorporated
SSOP 9 Type CJ

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DCM/CCM Mode Operation with HV start

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The AP3108L is a Current Mode PWM controller specially designed for offline power supply that requires ultra-low standby power, high- power 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.

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.


  • Open Frame Switching Power Supply
  • 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
  • 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


  • Switching AC-DC Adapter/Charger
  • Open Frame Switching Power Supply

Product Specifications

Product Parameters

Operation Mode CCM/DCM
HV Start-UpCircuit Yes
Vcc_MAX(V) 120 (VCC_IN)
UVLOThresholdon/off (V) 15.8/7.5 V
Gate OutputCurrent (mA) -0.7 mA
Maximum OscillationFrequency (kHz) 65 (CCM mode) kHz
BNO Auto-Recover
LOVP Auto-Recover
Release Date 201703

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