A3932
Three-Phase Power MOSFET Controller
Features and Benefits
Description
▪ Drives wide range of N-channel MOSFETs
▪ Synchronous rectification
The A3932 is a three-phase MOSFET controller for use with
bipolar brushless DC motors. Its high gate-current drive
capability allows driving a wide range of N-channel power
MOSFETs and can support motor supply voltages to 50 V.
Bootstrapped high-side drive blocks provide the floating
positivesuppliesforthegatedriveandminimizethecomponent
countnormallyrequired.Thehigh-sidecircuitryalsoemploysa
uniqueFETmonitoringcircuitthatensuresthegatevoltagesare
at the proper levels before turn-on and during the ON cycle.
▪ Power MOSFET protection
▪ Adjustable dead time for cross-conduction protection
▪ 100% duty cycle operation
▪ Selectable fast or slow current-decay modes
▪ Internal PWM peak current control
▪ High-current gate drive
▪ Motor lead short-to-ground protection
▪ Internal 5 V regulator
▪ Brake input
▪ PWM torque-control input
▪ Fault-diagnostic output
▪ Tachometer output
▪ Thermal shutdown
▪ Undervoltage protection
Internal fixed off-time PWM current-control circuitry can be
used to regulate the maximum load current to a desired value.
The peak load-current limit is set by the user’s selection of
an input reference voltage and external sensing resistor. The
fixed off-time pulse duration is set by a user-selected external
RC timing network. For added flexibility, the PWM input can
be used to provide speed/torque control, allowing the internal
current control circuit to set the maximum current limit.
Optionalsynchronousrectificationisincluded.Thisfeaturewill
short out the current path through the power MOSFET reverse
body diodes during the PWM off-cycle current decay.This can
minimize power dissipation in the power MOSFET, eliminate
theneedforexternalpowerclampdiodes,andpotentiallyallow
more economical choices for the MOSFET application.
Packages
The A3932 includes the commutation logic for Hall sensors
configuredfor120degreespacing.PowerMOSFETprotection
features include bootstrap capacitor charging current monitor,
undervoltagemonitor,motor-leadshort-to-ground,andthermal
shutdown.
38-pin TSSOP (suffix LD)
The‘–S–’part-numbersuffixindicatesanoperatingtemperature
rangeof-20°Cto+85°C.The‘–LD–’suffixindicatesa38-lead
TSSOP package. The initial ‘–TR–’ variant suffix indicates
tape and reel packing. The ‘–T’ final variant suffix indicates
lead (Pb) free composition, with 100% matte tin leadframe
plating.
Not to scale
26301.101H
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