PicoBuck – RGB LED Driver

The PicoBuck is a small and inexpensive 3-channel LED driver. It employs constant-current buck driving which approaches an efficiency of 95% (theoretical). It’s based on AL8805 LED Lighting Buck Driver from Diodes Inc.

RGB LED Driver


The PicoBuck supports a wide range of input voltages (6v to 20v) which may be connected to the VIN header. It has three inputs for each driver channel, labeled IN1, IN2, and IN3 which may be driven with standard 3.3v or 5v logic. LEDs are connected to the outputs of the driver, OUT1 through OUT3. Each channel of an RGB LED must be connected to the driver separately: this driver, like most buck drivers, does not support common-anode or common-cathode RGB LEDs.

Each channel of the PicoBuck can drive an LED at 350mA on the standard model. The driving current is set by a small current sensing resistor populated on the board. If you need to drive LEDs at higher or lower currents, just swap out the current sensing resistor to achieve your desired current. You can calculate the value of your current sensing resistor with the AL8805 spreadsheet.


Digital Mode
To use digital drive mode, apply a standard 3.3v or 5v PWM signal to any of the 3 inputs. This method gives good brightness resolution over the entire range of brightness when using 8 to 10 bit PWM.


For more detail: PicoBuck – RGB LED Driver

About The Author

Ibrar Ayyub

I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough research and presenting information in a structured and logical format.

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