资料介绍
wo low-cost CMOS ICs manage a 12 VDC, current-limited speed
control circuit for DC brush motors. The circuit design (see
Figure 1) uses PWM (pulse width modulation) to chop the effective
input voltage to the motor. Use of CMOS devices gives the benefits
of low power, minimal heat and improved longevity. The overall
design is simple, inexpensive and reliable, and is useful in applica-tions such as embedded DC motor control where efficiency,
economy and performance are essential. AN807
Low-CostDCMotorSpeedControlwithCMOSICs
OUTPUTS
Author: Scott Sangster,
Microchip Technology, Inc. Four outputs drive a MOSFET H-bridge, to provide rapid motor-
speedchangesandmotor-directionreversal.Thelowerrailpower
MOSFETs are N-channel devices, the upper MOSFETs are P-
INTRODUCTION
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