Microchip MCP1631RD-DCPC1, LED Driver Reference Design

The MCP1631HV Digitally Controlled Programmable Current Source Reference Design is used to drive and dim one or more power LEDs in a series or parallel topology (depending on the LED’s capability). The reference design may also be used to charge one to four cell NiMH/NiCd or one to two cell Li-Ion battery packs. The board uses the MCP1631HV high-speed analogue PWM controller and a PIC16F616 microcontroller to generate the proper dimming ratio for LEDs or charge algorithm for NiMH, NiCd and Li-Ion batteries. The board is used to evaluate the MCP1631HV in a SEPIC power converter application.

Input voltage range: +3.5 to +16V
Firmware default output current of 70mA with dimming ratio 10:1 (70mA/step)
Maximum output current of 1000mA
Maximum output power of 8.5W
Drives one or more LEDs
Firmware included for charging Li-Ion, NiMH, and NiCd batteries
Single ON/OFF/Dimming switch
Status and fault indication
Hardware and software overvoltage protection (OVP) set to +9.0V. The software value can be modified in the source code to be less than +9.0V

PWM (Pulse Width Modulation) Controllers, Microchip