A89506 Full-Bridge Gate Drivers for PWM Control

Allegro’s A89506 full-bridge gate drivers are designed for pulse-width modulated (PWM) control of DC motors. Capable of 50 V operation, they provide gate drive for all N-channel external MOSFET bridges to reduce EMI. A fault output notifies the microprocessor of bridge shorts or overcurrent events.

Input terminals control the speed and direction of a DC motor with externally applied PWM control signals. Internal synchronous rectification control circuitry lowers power dissipation during PWM operation. Internal circuit protection includes V_DS protection, thermal shutdown with hysteresis, undervoltage monitoring of V_BB, and crossover-current protection.

The A89506 offers effective replacement for relays and closure systems and can also be used to drive DC motors and actuators in conventional, hybrid electric vehicles (HEV) and electric vehicles (EV). They are ideal for applications such as window and door actuators, EV charger locks, electronic parking brakes, and folding mirrors. Their solid-state design also makes them perfect for battery-powered applications incorporating brushed DC motors such as building automation and robotics, improving reliability and battery life while facilitating smaller design footprints.