Diodes Incorporated

AP3766B (Not Recommended for new design)

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The AP3766B is a high performance AC/DC power supply controller for °C lighting application. The device uses Pulse Frequency Modulation (PFM) method to build discontinuous conduction mode (DCM) flyback power supplies. The AP3766B provides accurate constant voltage, constant current (CV/CC) regulation without requiring an opto-coupler and the secondary control circuitry. It also eliminates the need of loop compensation circuitry while maintaining good stability. The AP3766B can achieve excellent regulation and high average efficiency, yet meets no-load consumption less than 30mW. It also has an adjustable built-in line compensation function to achieve tight CC.


  • Primary Side Control for Tight Constant Current and Constant Voltage
  • 30mW No-load Input Power
  • Bipolar Junction Transistor (BJT) Driving
  • Open Circuit Protection
  • Over Voltage Protection
  • Short Circuit Protection
  • SOT-23-6 Package


• LED Driver

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