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Keywords: single device, pulse-width modulation (PWM), waveform generator
APPLICATION NOTE 5718
Simple Solutions for a Single-Device Pulse-Width
Modulation (PWM) Waveform Generator
By: Budge Ing
Oct 25, 2013
Abstract: Pulse-width modulation (PWM) generators are integrated in nearly every switching power
device. The methods of implementing integrated PWM generators are well-known. This application note
is prompted by a customer who asked for a single-device standalone analog PWM waveform generator.
A similar version of this article appears on EDN, September 25, 2013.
Pulse-width modulation (PWM) generators are integrated in nearly every switching power device. This
article shows two methods for implementing a stand-alone analog PWM waveform generator. These
designs can also be modified to make a dual-device PWM generator.
There are two ways to implement a single-device PWM waveform generator. One method uses an
ICM7555 timer, while the other uses a MAX998 low-power comparator. We will look at each.
Method 1: Use a Low-Power Timer as a PWM Generator
In this method an ICM7555 timer is configured as in Figure 1.
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