Allegro MicroSystems, Inc. has introduced two new full-bridge gate drivers for automotive and industrial applications that are available with direct control (A89505) and pulse-width modulation (A89506) options. These devices up-integrate critical features to make system design easier, replacing mechanical relays with solid-state drivers to improve performance and reliability. Both drivers include built-in current sensing capabilities, eliminating the need for external current sense resistors and reducing external component requirements to as few as seven.
The A89505 and A89506 gate drivers are ideal for vehicle applications such as window and door actuators, EV charger locks, electronic parking brakes, and folding mirrors. Their solid-state design also makes them ideal for battery-powered applications that incorporate brushed DC motors such as building automation and robotics, improving reliability and battery life while facilitating smaller design footprints.
Key Features
- 4.5 V to 50 V operating voltage
- Programmable PWM current limit without the need for external sense resistor
- Programmable gate drive limits slew rate for EMI reduction
- Analog output of the load current for microprocessor feedback
- Overcurrent flag output to detect stall conditions
- Full protection against short circuit events with fault flag
With built-in capabilities including flexible interface logic, EMI mitigation with programmable gate drive, motor current feedback and multiple diagnostic features, these devices require very few external components and integrated diagnostics further obviate the need for additional microprocessor programming and addition circuitry.
