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PRELIMINARY Brushless DC Controller With Drivers and Closed Loop Support The AAM858A is a monolithic Brushless DC Motor Controller with all the features needed to implement an open or closed loop 3 or 4 phase motor controller. It includes a rotor position decoder for commutation sequencing, temperature compensated reference for sensor power, frequency programmable saw-tooth oscillator, a fully floating high side drive implementation, as well as 3 low side drive outputs. All drive outputs provide for pull up and pull down capability with the provision of level shifting internally for the upper drive outputs. Low frequency operation is supported with individual current sources for each floating output as supplemental power for each bootstrap supoprted high side drive. Additionally, the AAM858A provides for a closed loop system implementation by the inclusion of a signal conditioning section for speed monitoring and error signal generation. This allows for closed loop speed control without the need for tachometers. Features include input buffers with hysteresis for noise immunity, as well as accompanying digital edge detectors and a programmable monostable multivibrator. An inverter output allows for conversion of sensor phasing when needed. The AAM858A is part of AAIs new family of Motor Control products. Features 
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