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The AP3302 is a Peak-Current control, Quasi-Resonant (QR) PWM controller which is optimized for high performance, low standby power and cost effective offline flyback converters.

At no load or light load, the IC will enter the burst mode to minimize standby power consumption. The minimum switching frequency (about 22kHz) is set to avoid the audible noise. When the load increases, the IC will enter valley lock QR mode with frequency foldback to improve system efficiency and EMI performance. The maximum switching frequency (about 120kHz) is set to clamp the QR frequency to reduce switching power loss. Furthermore, the frequency dithering function is built in to reduce EMI emission.

Internal piecewise linear line compensation ensures constant output power limit over entire universal line voltage range.

Comprehensive protection features are included, such as brown out protection, cycle-by-cycle current limit (OCP), VCC Over Voltage Protection (VOVP), Secondary-side Output OVP (SOVP) and UVP (SUVP), internal OTP, Over Load Protection (OLP) and pins’ fault protection.


  • Switching AC-DC Adapter/Charger
  • ATX/BTX Auxiliary Power
  • Set -Top Box (STB) Power Supply
  • Open Frame Switching Power Supply


  • Very Low Start-Up Current
  • Quasi-Resonant Operation with Valley Lock under All Line and Load Condition
  • Non-Audible-Noise Quasi-Resonant Control
  • Soft Start During Startup Process
  • Frequency Fold Back for High Average Efficiency
  • Constant Over Current Protection
  • Secondary Winding Short Protection with FOCP
  • Frequency Dithering for Reducing EMI
  • VCC Maintain Mode
  • Useful Pin Fault Protection: SENSE Pin Floating
  • FB/Opto-Coupler Open/Short
  • Comprehensive System Protection Feature: 
    • VCC Over Voltage Protection (VOVP)
    • Over Load Protection (OLP)
    • Brown Out Protection (BNO)
    • Secondary Side OVP (SOVP) and UVP (SUVP)
  • Mini Size Package of SOT26

Product Specifications

Product Parameters

HV Start-Up Circuit No
Startup Current 1 µA
UVLO Threshold on/off 15.8/7.6 V
Gate Output Current 350 mA
Oscillation Frequency 120 kHz
VOVP Auto-Recover
BNO Auto-Recover

Related Content

SOT26 (SC74R)


Technical Documents

Evaluation Boards and User Guides

Recommended Soldering Techniques


Orderable Part Number Authorized Distributor Quantity Inventory Date Buy Online Region
AP3302K6TR-G1 Avnet EU 3000 8/3/2020 Buy Now Germany
AP3302K6TR-G1 Mouser Electronics Inc. 5545 8/3/2020 Buy Now United States
AP3302K6TR-G1 Digi-Key Electronics 1875 8/2/2020 Buy Now United States
AP3302K6TR-G1 Future Electronics - Asia 9000 8/2/2020 Singapore