LED Driver

Drives 4 RGB/W LEDs with PWM for a total of up to 3 A controlled over an I2C bus.

Design

This design is based around a PCA9685 I2C PWM chip with 16 channels. Each channel drives an N-channel MOSFET low-side switch. Each group of 4 channels and a positive common rail feeds a JST XH 5-pin connector to which an RGB/W LED lamp may be attached.

The I2C bus must be referenced to the same ground as the negative input.

The board is designed for use with a 12 V nominal power supply but should work with anything from about 5 V to 16 V. It includes a 3 A polyfuse and transient voltage suppression. In case of reverse polarity connection, the TVS shunts the power input across the polyfuse.

Notice

The software, documentation, design, and all copyright protected artifacts are released under the terms of the MIT license.

The hardware is released under the terms of the CERN-OHL-W license.