Allegro DC motor controller IC integrated commutation logic

Allegro releases two new automotive grade (temperature and voltage rated) three-phase brushless DC motor controller integrated circuits.

The two control IC with integrated commutation logic that reduces system load of the microprocessor. If necessary, can also be driven directly by microprocessor Hall sensor inputs, the A3930 and A3931 BEMF (without sensor) is a key part of the solution. The controller is used primarily to adopt separation/external n-Channel MOSFET driver with Hall commutation-phase motor vehicles.

On-chip commutation decoder and state machine read three Hall sensor input input (or microprocessor IO output).

In this case, the IC output correct gate drive signal, control six (three at the top, the bottom three in the) three-phase BLDC motor driven external NMOS MOSFET. The IC's other features: 5 V supply voltage for Hall sensors (requires external NPN transistor), integrated charge pump, running on a wide range of battery voltage (5.5 V to 50 V), comprehensive diagnosis and low current quiescent current mode.

Allegro's A3931 is on the basis of the A3930 slightly improved.

A3931 optional pre-registration through the three Hall input control for realization of low-input. The location is set to one of the two brake position, you can know the motor start location. The start condition support all IC using algorithm (such as: no sensor BEMF rectifier programme).

A3930 and A3931 adopt the small scaled high thermal efficiency 48L eLQFP package.