SparkFun
PicoBuck LED Driver
The PicoBuck is a three-channel constant-current LED driver based on the AL8805. Each channel drives LEDs at 330 mA by default, with a solderable jumper to i...
The PicoBuck is a three-channel constant-current LED driver based on the AL8805. Each channel drives LEDs at 330 mA by default, with a solderable jumper to increase the maximum to 660 mA per channel. Dimming is controlled via PWM or analogue voltage signals from a microcontroller.
The board supports input voltages up to 36 V (the full rating of the AL8805) and provides three independent signal inputs for individual or simultaneous channel dimming. Two snap-off mounting holes for 4-40 or M3 screws allow flexible installation.
Key Features
- 3-Channel Constant Current – Independent control of three LED channels
- 330 mA Default – Jumper-selectable increase to 660 mA per channel
- PWM Dimming – 0–100% range (min <0.4 V, max >2.4 V)
- Analogue Dimming – 20–100% range (0.5–2.5 V)
- Wide Input Voltage – Up to 36 V DC
- Snap-Off Mounting Tabs – 4-40 or M3 screw holes, removable for compact installation
Specifications
- Driver IC – AL8805W5
- Default Current – 330 mA per channel
- Max Current – 660 mA per channel (with jumper)
- Input Voltage – Up to 36 V DC
- Channels – 3
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- LED
- A light-emitting diode is a small electronic component that lights up when current flows through it in the correct direction. In this kit, LEDs create the flashing effect, so polarity and correct soldering matter for the project to work.
- LED driver
- An LED driver is a control chip or circuit that supplies and switches power to LEDs. For a display board, it reduces the number of microcontroller pins needed and handles tasks like lighting the right segments and adjusting brightness.
- microcontroller
- A microcontroller is a small computer on a chip that runs your program and controls connected inputs and outputs. For this product, it is the part that reads buttons and sensors, drives the display and speaker, and communicates over Bluetooth.
- PWM
- Pulse Width Modulation is a way for a digital pin to simulate variable output power by switching on and off very quickly. It matters for controlling things like LED brightness, motor speed, or servo-style signals from a microcontroller pin.
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Brands
Components
PicoBuck LED Driver Schematic
Schematic · 36.3 KB · Click any page to view full size
AL8860 LED Driver Datasheet
Datasheet · 1000.7 KB · Click any page to view full size
AL8805 LED Driver Datasheet
Datasheet · 960.1 KB · Click any page to view full size
Resources & Downloads
Guides, code examples, and more
