N-channel MOSFET IRF3205 MOSFET, using two dedicated half-bridge driver chip on the tube using the bootstrap capacitor, the tube has sufficient driving voltage, the MOSFET channel can be opened quickly, improve acceleration curvature of the motor, but also quickly for motor braking. This can make the car can quickly start can quickly kill the car.
The drive can operate in 0% -99% of the duty cycle of the PWM modulation, so that the motor can get enough drive voltage.
Module Signal table:
Motor forward: DR = 1 PWM = PWM
Motor reversal: DR = 0 PWM = PWM
Parking brake: DR = X PWM = 0
Motor and power connections
Then the power pins are VCC, GND . Two motors were connected to OUTA1 OUTA2, OUTB1 OUTB2.
Product performance parameters:
Use: Freescale smart car contest Undergraduate Electronic Design Contest variety of DC motor control circuit