Automotive Grade MOSFET Controllers with Commutation Logic
Tue, 03/11/2008 - 7:50am
Allegro MicroSystems, Inc. introduces its A3930 and A3931 automotive grade (temperature and voltage rated) three-phase BLDC motor controller integrated circuits. These control ICs simplify the system design and lower system cost by integrating the commutation logic on-board, which lessons the burden on the system microprocessor. If desired, the Hall sensor inputs can be driven directly by a microprocessor, making the ICs key components in a robust BEMF (sensor-less) system. These controllers are primarily targeted at automotive Hall commutated three-phase motors driven by discrete/external N-Channel MOSFETs. An on-chip commutation decoder and state machine reads the inputs of three Hall sensor inputs (or IO outputs from a microprocessor). The IC then outputs the correct gate drive signals.