Diodes Incorporated
SO 8

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AP1688 (Obsolete)

AC/DC, High PF, High Efficiency, Universal Mains LED Driver Controller

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The AP1688 is a high performance AC/DC PFC and constant current controller for universal mains LED driver applications. The device is a buck controller which operates as a boundary conduction mode (BCM) to achieve high efficiency and easy EMI.

An open loop algorithm is adopted in the AP1688, which will make the system achieve excellent line and load regulations with high PF for universal mains input.

The AP1688 features fast start-up, low start-up current, low operation current and high efficiency. It also has rich protection features including over voltage, short and open circuit, over current, over temperature protection.

The AP1688 is available in SO-8 package.


  • Optimized for Buck Topology
  • Boundary Conduction Mode (BCM) Operation to Achieve High Efficiency
  • High Power Factor > 0.9
  • High Efficiency > 90%
  • System Current Accuracy: ±5%
  • Good Line Regulation and Load Regulation
  • Low Start-up Current
  • Tight CC Regulation Performance for Universal Input Mains Voltage Range
  • Eliminates Control Loop Compensation Circuitry
  • Easy EMI
  • Built-in Acceleration Start
  • Open-load and Reload Detection
  • Over Temperature Protection
  • Over Current Protection
  • Over Voltage and Short and Open Circuit Protection
  • Totally Lead-Free & Fully RoHS Compliant 
  • Halogen and Antimony Free. “Green” Device 


  • Universal Mains LED Lighting

Product Specifications

Product Parameters

Accuracy (%) 3
Dimming N/A
Efficiency (%) 90
Frequency (kHz) N/A
LED Current (mA) External MOSFET
Maximum DC VDD (VDC) 21
Maximum Input AC Voltage (VAC) 305
Minimum Input AC Voltage (VAC) 85
SupplyCurrent (mA) 1
Temperature Range (°C) -40 to 105

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