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Bi-directional speed-adjusting motor driver circuit diagram

2016-09-01 00:11  
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Bi-directional speed-adjusting motor driver circuit diagram
Output and level conversion Output signal line is introduced by Port. Pin Port1 is the input end of motor direction signal, pin port2 is the PWN signal input end, and pin port3 is the grounding line. Attention that pin port3 is grounded and connected with a 2kΩ resistance. When the driver panel and monolithic provides power respectively, the resistance can provide the backflow passageway for signal circuit. When the driver and monolithic together use a same group of power, the resistance can prevent high current from flowing to the monolithic mainboard ground wire along the line which will lead to interference. Or, it is equivalent to separate the ground wire of the friver panel and the ground wire of monolithic, and to realize “one-point earth fault”. Capacitance C1 prevents the voltage from going down suddenly which is caused by the sudden start-up of the motor.