Diodes Incorporated

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AP1686 (Not Recommended for new design)

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The AP1686 is a high performance AC/DC power supply controller for LED lighting application. The device uses Pulse Frequency Modulation (PFM) method to build discontinuous conduction mode (DCM) flyback power supplies. The AP1686 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 AP1686 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

Product Specifications

Product Parameters

Accuracy (%) 5
Dimming N/A
Efficiency (%) 85
Frequency (kHz) N/A
LED Current (mA) External BJT
Maximum DC VDD (VDC) N/A
Maximum Input AC Voltage (VAC) 30
Minimum Input AC Voltage (VAC) 85
SupplyCurrent (mA) 0.4
Temperature Range (°C) -40 to 85

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Technical Documents

Recommended Soldering Techniques


Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2380 2018-11-07 2019-05-07 Device End of Life (EOL)