脉冲宽度调制器经营各种级别的频率和功率

三个运算放大器的一般用途的脉冲宽度调制器。
Maxim/Dallas > App Notes > AMPLIFIER AND COMPARATOR CIRCUITS AUTOMOTIVE

Keywords: pulse-width modulation, PWM, pulse width modulator, integrator, comparator, triangle-wave Apr 23, 2004
generator

APPLICATION NOTE 3201
Pulse-Width Modulator Operates at Various Levels of Frequency and
Power

Build a general-purpose pulse-width modulator using three op amps from a quad-op-amp device.


The many applications for pulse-width modulation (PWM) include voltage regulation, power-level control, and fan-
speed control. A PWM circuit for such applications (Figure 1) can be implemented with three op amps from a
single quad-op-amp chip. The use of op amps allows a wide variety of applications. Low-power op amps can be
used in a low-power system, for example, and high-frequency op amps can be