A3933 Datasheet PDF - Allegro MicroSystems

THREE-PHASE POWER MOSFET CONTROLLER

The A3933SEQ is a three-phase MOSFET controller for use with bipolar brushless dc motors. It drives all n-channel external power FETs, allowing system cost savings and minimizing r(DS)on power loss. The high-side drive block is implemented with bootstrap capacitors at each output to provide the floating positive supply for the gate drive. The high-side circuitry also employs a unique “intelligent” FET monitoring circuit that ensures the gate voltages are at the proper levels before turn-on and during the ON cycle. This device is targeted for
applications with motor supplies from 12 V to 28 V.

FEATURES ANDBENEFITS
■Drives External N-Channel FETs
■Intelligent High-Side Gate Drive
■Selectable Coast or Dynamic Brake on Power Down
■Adjustable Dead Time for Cross-Conduction Protection
■Selectable Fast or Slow Current-Decay Modes
■Internal PWM Peak Current Control
■Reset/Coast Input
■120°Hall Commutation with Internal Pullup
■Internal 5-V Regulator
■Low-Side Synchronous Rectification
■Direction Control
■PWM Speed-Control Input
■Fault-Diagnostic Output
■Under-Voltage Protection