A3932SEQ is a three-phase brushless DC motor controller, which supports 12-50V voltage, and has internal fixed off time PWM current control circuit, maximum current limit is set by input reference voltage and external sensing resistor. It also has optional synchronous rectification, 120-degree spacing Hall sensor commutation logic, MOSFET gate-source voltage monitor, bootstrap capacitor charging current monitor, undervoltage lockout, overcurrent protection and etc.
The Allegro A3932SEQ is an advanced three-phase power MOSFET controller designed for driving a wide range of N-channel MOSFETs in brushless DC motors. It supports motor supply voltages from 12 to 50V and integrates a bootstrapped high-side driver to minimize external component count.
The device includes internal fixed off-time PWM current control circuitry to regulate maximum load current, with the peak limit set by an input reference voltage and sensing resistor. Key features include optional synchronous rectification to reduce power dissipation, commutation logic for Hall sensors configured for 120-degree spacing, and comprehensive protection against gate-source overvoltage, undervoltage, thermal shutdown, and motor lead shorts.
| Motor Supply Voltage Range | 18 to 50 V |
|---|---|
| Operating Temperature Range | -20°C to +85°C |
| Gate Drive Source Current | 1.25A |
| Gate Drive Sink Current | 2.5A |
| Thermal Shutdown Temperature | -165°C (Typical) |
The SR pin controls synchronous rectification; Logic LOW disables the feature forcing current decay through flyback diodes, while Logic HIGH enables it.
The peak load current limit is set by the user's selection of an input reference voltage and an external sensing resistor.
Any fault will force a COAST condition, which turns all power MOSFETs off.