The AK-LED-DRIVER board is a constant current LED driver that can drive high-power/high-brightness LEDs with up to 1A output current. It is based on the AL8861C from Diodes Incorporated and can take an input voltage from 4.5V to 40V, delivering constant current to your LED with high efficiency (up to 97%).

The board is very easy to use: select the output maximum output current by soldering the solder jumper pads on the back of the board. By default, the board outputs 300mA with no jumpers soldered. The output selection is “incremental”, so by soldering the 500mA pads, it outputs 500mA; by soldering the 500mA pads and also the 700mA pads, it outputs 700mA; by joining all the three pads it outputs 1A.


AK-LED-DRIVER output current selection pads


After selecting the output current, connect the LED anode to the + pin and the LED cathode to the pin. Connect GND to ground and apply a voltage between 4.5V and 40V to the VIN pin. That’s it.

By default the CTRL pin is floating, so the current output is automatically enabled. The LED can be powered off by pulling the CTRL pin to ground, and can be powered on again by setting a voltage higher than 2.5V DC. Also, the CTRL pin can be used for dimming by sending a PWM signal to it, or optionally by setting an analog voltage between 0.3V and 2.5V.

The board can also handle LEDs in series and different types of LED diodes, like LASER diodes! Here’s an experiment using the AK-LED-DRIVER board with an Osram PL TB450B LASER diode at 1A:


AK-LED-DRIVER lights a match with a laser



  • Wide Input Voltage Range: 4.5V to 40V
  • Operating ambient temperature: -40ºC to +85ºC
  • Typical 5% output current accuracy
  • Dimmer control through PWM or analog voltage
  • Selectable output current (300mA, 500mA, 700mA or 1A)
  • Soft-start
  • High efficiency: up to 97%
  • LED short protection
  • Inherent open-circuit LED protection
  • Overtemperature protection (OTP)
  • 2 mounting holes
  • ENIG contacts
  • Small size



More Info

NOTE: before September 2023 this board carried the AL8851 IC. Here follows the documentation for said version:

Additional information

Weight 0.010 kg
Dimensions 23.5 × 13 × 6 mm



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AK-LED-DRIVER – 1A Buck LED Driver Breakout

The AK-LED-DRIVER breakout board is a constant current buck LED driver with selectable output current and dimmer capabilities.


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