DRV8307_15 Datasheet, PDF (9/34 Pages) Texas Instruments – DRV8307 Brushless DC Motor Controller

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8 Detailed Description
DRV8307
SLVSCK2 – APRIL 2014
8.1 Overview
The DRV8307 device controls 3-phase brushless DC motors using a speed and direction input interface and Hall
signals from the motor. The device drives N-channel MOSFETs with 10-V V_GS and a gate drive current of 30 mA.
The speed of the motor is controlled by varying the duty cycle of the input clock (pulse-width modulation). Motor
speed is indicated on the HALLOUT terminal, which follows the HALL U transitions.
When the DRV8307 device begins spinning a motor, it initially uses all three Hall sensor phases to commutate.
After a constant speed is reached, the LOCKn terminal is pulled low and only one Hall sensor becomes used;
this feature reduces jitter by eliminating the error caused by non-ideal Hall device placement and matching.
Numerous protection circuits prevent system components from being damaged during adverse conditions.
Monitored aspects include motor voltage and current, gate drive voltage and current, device temperature, and
rotor lockup. When a fault occurs, the DRV8307 device stops driving and pulls FAULTn low, in order to prevent
FET damage and motor overheating.
The DRV8307 device is packaged in a compact 6 × 6-mm, 40-terminal VQFN with a 0.5-mm terminal pitch, and
operates through an industrial ambient temperature range of –40°C to 85°C.
Copyright © 2014, Texas Instruments Incorporated
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