DESCRIPTION
TheSC7931 is a complete 3-phase brushless DC motor pre-driver.
The device is capable of driving a wide range of N-channel power MOSFETs and can support motor supply voltages up to 30 V. Commutation logic is determined by three Hall-element inputs spaced at 120°.
Other features include fixed off-time pulse-width modulation(PWM) current control for limiting inrush current, locked-rotor protection with adjustable delay, thermal shutdown, overvoltage monitor, and synchronous rectification. Internal synchronous rectification reduces power dissipation by turning on the appropriate MOSFETs during current decay, thus shorting the body diode with the low RDS(on) MOSFET. Overvoltage protection disables synchronous rectification when the motor pumps the supply voltage beyond the overvoltage threshold during current recirculation.
The SC7931 offers enable, direction, and brake inputsthat can control current using either phase or enable chopping. Logic outputs FG1 and FG2 can be used to accurately measure motor rotation. Output signals toggle state during Hall transitions,providing an accurate speed output to a microcontroller or speed control circuit.
The SC7931 is supplied in a 5 mm × 5 mm, 28-terminal QFN package with exposed thermal pad. This small footprint package is lead (Pb) free with 100% matte-tin lead frame plating.
FEATURES AND BENEFITS
▪ Drives 6 N-channel MOSFETs
▪ Synchronous rectification for low power dissipation
▪ Internal UVLO and thermal shutdown circuitry
▪ Hall element inputs
▪ PWM current limiting
▪ Dead time protection
▪ FG outputs
▪ Standby mode
▪ Lock detect protection
▪ Overvoltage protection
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