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AN874

Part Number	AN874
Manufacturer	Microchip
Description	Buck Configuration High-Power LED Driver
Published	Apr 6, 2018
Detailed Description	AN874 Buck Configuration High-Power LED Driver Author: Keith Curtis Microchip Technology Inc. INTRODUCTION The circuit ...
Datasheet	AN874 PDF File

Overview

AN874 Buck Configuration High-Power LED Driver Author: Keith Curtis Microchip Technology Inc.
INTRODUCTION The circuit and firmware described in this application note demonstrates a minimal parts count driver/controller for a high-power (1W or greater) LED.
The circuit is based on a buck topology switching power supply using the on-chip comparator peripheral within the PIC12F675 PIC® microcontroller.
The switching power supply design ensures efficient power transfer between the system battery and the output LED.
The Flash PIC microcontroller is used to implement intensity control, automated intensity compensation for low battery conditions, and the ability to playback preprogrammed Flash se...

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