Allegro MicroSystems A3931
the A3931 pre-positions the motor in an unstable starting position suitable for start-up algorithms in microprocessor-driven sensor-less control systems. Both devices are supplied in a 48-pin LQFP with exposed thermal pad. This is a small footprint (81 mm2) power package.| Part No. | A3931 |
|---|---|
| Datasheet | A3931 Download |
| Manufacturer |  Allegro MicroSystems |
| Description | Automotive 3-Phase BLDC Controller and MOSFET Driver |
| Buy | Stock & Price |
FEATURES AND BENEFITS
● High current three-phase gate drive for N-channel MOSFETs● Synchronous rectification
● Cross-conduction protection
● Charge pump and top-off charge pump for 100% PWM
● Integrated commutation decoder logic
● Operation over 5.5 to 50 V supply voltage range
● Extensive diagnostics output
● Provides +5 V Hall sensor power
● Low-current sleep mode PACKAGE: 48-Lead LQFP with exposed thermal pad (suffix JP) Not to scale
DESCRIPTION
The A3930 and A3931 are three-phase brushless DC (BLDC) motor controllers for use with N-channel external power MOSFETs. They incorporate much of the circuitry required to design a cost-effective three-phase motor drive system and have been specifically designed for automotive applications. A key automotive requirement is functionality over a wide input supply range. A unique charge pump regulator provides adequate (>10 V) gate drive for battery voltages down to 7 V, and allows the device to operate with a reduced gate drive at battery voltages down to 5.5 V.
