Diodes Incorporated
SO 7

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AL1678 (Obsolete)

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The AL1678 is a high efficiency and high accuracy converter for LED driver. It is a universal buck solution. The AL1678 provides accurate constant current (CC) regulation.

The AL1678B integrates a 0.8A/500V MOSFET, the AL1678C integrates 1.0A/500V MOSFET and the AL1678D integrates a 2.0A/500V MOSFET. These products can cover 3W to 15W’s mainly application.

It only has a few external components can realize a good constant current performance. The AL1678 controls the system operating at boundary conduction mode (BCM) which is good for EMI.

The AL1678 features low start-up current, extremely low operation current which can remove the auxiliary winding for IC’s power supply. It has thermal fold back function which can reduce the output current when the driver’s temperature is higher than the setting value. The thermal fold back function can improve the system reliability. It has rich protection features including overvoltage, short circuit, over temperature protection.


  • Valley on Function to Achieve Low Switching Loss
  • Internal Integrate a High Voltage MOSFET
  • Low Start-up Current
  • High Efficiency up to 90%
  • BCM Mode
  • Build in UVLO,LEB,LED Open, LED Short and OTP Protection
  • Tight LED Open Voltage
  • Open-Load and Reload Detection
  • Internal Thermal Foldback Function
  • Low System Cost
  • SO-7 Package


  • Non-dimmable LED Drivers

Product Specifications

Product Parameters

Accuracy (%) 3
Dimming N/A
Efficiency (%) 90
Frequency (kHz) N/A
LED Current (mA) 120, 180, 240
Maximum DC VDD (VDC) 16
Maximum Input AC Voltage (VAC) 265
Minimum Input AC Voltage (VAC) 85
SupplyCurrent (mA) 0.12
Temperature Range (°C) -40 to 105

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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-2464 2020-04-28 2020-10-28 Device End of Life (EOL)