This application note presen ts the design equations,
schematics and source code for a 5.5W power LED
driver using the PIC16F785 MCU. The application, as
shown, can be connected to operate as a buck-boost
converter or a boost converter.
The PIC16F785 makes a great choice for this
application because it combines a MCU with many on-
chip analog peripherals. This application is similar to
the circuit described in Microchip’s application note
AN874 and you can refer to this document for more
design information. This application note builds on the
application described in AN874 and adds the following
features: AN1047
Buck-Boost LED Driver Using the PIC16F785 MCU
A simple method that can be used to drive an LED is to
Author: Stephen Bowling
install a resistor in series to limit the current. A linear
Microchip Technology Inc.
voltage regulator or op amp circuit can also be
connected in a constant current source configuration.
INTRODUCTION However, these methods will not have enough
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