资料介绍
In many applications, a DC/DC Converter is used to
produce a regulated voltage or current, derived from an
unregulated power supply, or from a battery. Examples
of these applications include battery chargers, elec-
tronic air purifiers, emergency exit signs, and distrib-
uted power systems.
In some of those applications, a dedicated Switched
Mode Power Supply (SMPS) Controller IC is used in
conjunction with a microcontroller. In other applica-
tions, however, a dedicated SMPS Controller IC may be
overkill. An alternative approach is to generate a low
cost SMPS function in a smart microcontroller, such as
the PIC16C620A. This Application Note shows a
method of using the microcontroller to perform simple
SMPS control functions.
Two circuits were built for evaluation. One circuit pro-
vides a Constant Voltage output, the other a Constant
Current output. AN216
DC/DC Converter Controller Using a
PICmicro Microcontroller
In any type of DC/DC Converter circuit, the power
Author: Hartono Darmawaskita device selections are very important. The key parame-
Microchip Technology Inc. ters to look for in the transistor Q1 are the switching
time and current rating. These two parameters greatly
affect the maximum switching frequency of the con-
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