I built another board, which is a 3-channel (RGB) LED driver based on an inexpensive chipset called PT4115 (you can find them on eBay or Aliexpress).
The circuit is very simple and looks like Sparkfun’s PicoBuck. However, I used beefier components and a different chip. You may say it’s pretty much the same thing, but I made it to learn some more about PCB design.
Datasheet here. LED current is set through a sense resistor. The output current I is equal to 0.1/Rs. I wanted ~300mA for each channel so I chose a 0.33 ohm resistor. If you want 350mA, choose a 0.27ohm resistor.
Each channel can be controlled via PWM (you can solder male/female headers on the board), for example with an Arduino.
You can input up to 30V and control 3W/10W/20W LEDs.
- C1, C2, C3: 22uF tantalum capacitors (DigiKey part number: 399-3781-1-ND)
- D1, D2, D3; Schottky diode 2A SMA package (DigiKey part number: B240A-FDICT-ND)
- L1, L2, L3: 68uH power inductor, 0.7A (DigiKey part number: PCD2117CT-ND)
- R1, R2, R3: 0.33ohm resistors, 0805 package.
- 4x screw terminals, 3.5mm (bought mine on Tayda Electronics)
- 3x PT4115 drivers.
- 1x 4-pin + 1x 2-pin male or female headers.
PCBs available here (already sold out, actually!) and on Tindie soon.