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 ……