Microchip MCP1631RD-DCPC1, LED Driver Reference Design

MCP1631HV Programmable Current Source 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