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AN874
| Title |
Title
Buck Configuration High-Power LED Driver
|
|---|---|
| Name |
Name
AN874
|
| Date |
Date
06/24/2015
|
| Application Categories |
Application Categories
Automotive /
Safety
Lighting /
LED
Power Supply & Conversion /
DC DC
|
| Product Categories |
Product Categories
Linear Devices /
Comparators
Power Management ICs /
PWM Controllers
|
| Description |
Description
The circuit and firmware described in this application note demonstrate a minimal parts count driver/controller for a LumiLED? LED. The circuit is based on a buck topology switching power supply using the on-chip comparator peripheral within the PIC12F675 microcontroller. The switching power supply design ensures efficient power transfer between the system battery and the output LED. Using the attached Flash microcontroller as a control for the driver circuit expands the capability of the circuit to include intensity control, automated intensity compensation for low battery conditions, and the ability to playback preprogrammed Flash sequences. The Flash microcontroller also allows the creation of a custom PC-based graphical user interface, using the PICkit? Flash Starter Kit for programming the preprogrammed Flash sequences. The combination of the switching power supply design and the microcontroller results in an efficient circuit with advanced automated features while keeping the circuit simple and inexpensive.
|
Files
| Title | Title | Download | Date | Size |
|---|---|---|---|---|
| AN874 Source Code - Buck Configuration High-Power LED Driver 25.7 KB 06/23/2015 | AN874 Source Code - Buck Configuration High-Power LED Driver | Download | 06/23/2015 | 25.7 KB |
| Programming GUI 2.9 MB 06/24/2015 | Programming GUI | Download | 06/24/2015 | 2.9 MB |