Diodes Incorporated AP3304 Multi-Mode PWM Controller

Diodes Incorporated AP3304 Multi-Mode PWM Controller


Diodes Incorporated AP3304 Multi-Mode PWM Controller is optimized for high-performance, low standby power, and cost-effective offline flyback converters. This PWM controller features peak-current control, multi-mode control with CCM+QR, a low start-up current of 1μA, and a soft start during the start-up process. The AP3304 PWM controller at light load operates in burst mode with a 23kHz switching frequency to minimize standby power consumption and avoid audible noise. When the load increases, the AP3304 PWM controller will enter QR mode with frequency fold-back to improve system efficiency and EMI performance. The AP3304 multi-mode PWM controller offers a built-in frequency dithering function to reduce EMI emission. Typical applications include switching AC-DC adapter charger, ATX/BTX auxiliary power, Set-Top Box (STB) power supply, and open frame switching power supply.


  • Very low start-up current
  • Multi-mode control with CCM+QR
  • Soft start during the start-up process
  • Frequency fold back for high average efficiency
  • Constant Over Current Protection (OCP)
  • Secondary winding short protection with FOCP
  • Built-in frequency dithering function to reduce EMI emission
  • 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 (Type A1)
  • Lead-free and fully RoHS compliant
  • Halogen and antimony free – “Green” device

Application Circuit

more information: https://www.diodes.com/assets/Datasheets/AP3304.pdf

Mike is the founder and editor of Electronics-Lab.com, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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