Diodes Incorporated
SO 8

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AP1684 (Not Recommended for new design)

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The AP1684 is a high performance AC-DC power factor corrected LED driver controller which is driving high voltage bipolar transistor. The device uses Pulse Frequency Modulation (PFM) technology to regulate output current while achieving high power factor and low THD. It operates as a boundary condition mode (BCM) buck controller which is good for EMI. The AP1684 provides accurate constant current (CC) regulation while removing the opto-coupler and secondary control circuitry. It also eliminates the need of loop compensation circuitry while maintaining stability. It can meet the requirement of IEC6100-3-2 harmonic standard. The AP1684 features low start-up current, low operation current and high voltage driving bipolar transistor. It adopts dynamic base driver control technology and valley on switching mode to achieve high efficiency. It also has rich protection features including over voltage, short circuit, over temperature protection.


  • Low Start-up Current
  • High PF and Low THD (PF > 0.9, THD < 30%)
  • High Efficiency up to 92%
  • BCM Mode
  • Output Current Accuracy on IC Level: ±2%
  • Tight LED Open Voltage
  • Valley-mode Switching to Minimize the Transition Loss
  • BJT Transistor Driver
  • Dynamic Base Driver Control
  • Open-load and Reload Detection
  • Internal Protections:
  • Under Voltage Lock Out (UVLO)
  • Leading-edge Blanking (LEB)
  • Output Short Protection
  • Output Open Protection
  • Over Temperature Protection
  • Low System Cost
  • SO-8 Package


  • LED Bulb Lamp
  • LED Down Light
  • GU10/E27
  • Other Non-dimmable LED Lighting

Product Specifications

Product Parameters

Accuracy (%) 2
Dimming N/A
Efficiency (%) 93
Frequency (kHz) N/A
LED Current (mA) 200
Maximum DC VDD (VDC) 25
Maximum Input AC Voltage (VAC) 305
Minimum Input AC Voltage (VAC) 85
SupplyCurrent (mA) 0.9
Temperature Range (°C) -40 to 105

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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-2519 2021-05-20 2021-11-20 Device End of Life (EOL)