The A4910 is a three-phase controller for use with N-channel external power MOSFETs and is specifically designed for automotive applications.
A unique charge pump regulator provides full (>10 V) gate drive for battery voltages down to 7 V, and allows the A4910 to operate with a reduced gate drive down to 5.5 V.
A bootstrap capacitor is used to provide the above battery supply voltage required for N-channel MOSFETs. An internal charge pump for the high-side drive allows DC (100% duty cycle) operation.
Full control over all six power MOSFETs in the 3-phase bridge is provided, allowing motors to be driven with block commutation or sinusoidal excitation. The power MOSFETs are protected from shoot-through by integrated crossover control and programmable dead time.
Current in each half bridge can be measured using integrated current sense amplifiers. These are three user-configurable differential amplifiers, with below ground common mode range and excellent transient response and settling time, allowing them to be used in low-side current sense applications.
Integrated diagnostics provide indication of undervoltage, overtemperature, and power bridge faults, and can be configured to protect the power MOSFETs under most short circuit conditions. Detailed diagnostics are available as a serial data word.
Allegro recommended automotive-qualified Hall latches: APS122x5 and APS122x0
The A4910 is supplied in a small footprint (81 mm2) 48-pin LQFP with exposed thermal pad (suffix JP). It is lead (Pb) free, with 100% matte tin leadframe plating.
Applications
- Electronic power steering (EPS, EHPS, EAS)
- Hydraulic pumps
- Engine cooling fan
- Gearbox actuator
