Diodes Incorporated AP3128 PWM Controller

Diodes Incorporated AP3128 PWM Controller is a peak-current control and multi-mode (QR+CCM) PWM controller. This controller is optimized for high performance, low standby power, and cost-effective offline flyback converters. The AP3128 is designed to enter burst mode at no-load/light-load and minimizes standby power consumption. This controller features a 105kHz maximum switching frequency that clamps the QR frequency to reduce switching power loss and the minimum frequency avoids audible noise. The AP3128 controller offers multi-mode control, soft start during the startup process, frequency foldback for high average efficiency, and secondary winding short protection with FOCP. Typical applications include a cell phone charger, Power Delivery (PD) application, ATX/BTX auxiliary power, Set-Top Box (STB) power supply, open frame switching power supply.

Features

• Multi-mode control
• Quasi-Resonant (QR) operation at high line voltage
• Continuous Current Mode (CCM) operation at low line voltage
• Non-audible noise quasi-resonant control
• Soft start during the startup process
• Frequency fold back for high average efficiency
• Constant Over Current Protection (OCP)
• Secondary winding short protection with FOCP
• Frequency dithering for reducing EMI
• Useful Pin fault protection:
  • SENSE pin floating
  • FB/optocoupler open/short
• Comprehensive system protection feature:
  • V_CC Overvoltage Protection (VOVP)
  • Overload Protection (OLP)
• Brown Out Protection (BNO)

Specifications

• 10V to 50V supply voltage range
• -40°C to 150°C operating junction temperature range
• 80kHz (CCM mode) oscillation frequency
• 1µA startup current
• -800mA to 300mA output current range
• 550mW Power Dissipation (P_D) at T_A < 25°C

Block Diagram

Application Circuit

more information: https://www.diodes.com/part/view/AP3128

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