A 6-amp monolithic H-bridge controller has been designed for automotive applications using a self-isolated vertical CMOS process. The controller integrates system-level interfacing circuitry and control strategy. In addition, it provides protection features including short circuit protection through over-temperature and over-current detection, as well as over-voltage protection from integrated active damping circuitry. The H-bridge controller IC combined with few external components provides a costeffective motor control circuit that fits within a 25 x 21 millimeter footprint. The high side switches are integrated in the controller in a standard SO-20 package for low cost, ease of drive and protection. The low side switches are in two separate SO-8 packages developed specifically for use with the controller. The controller limits the in-rush current of a DC motor and hard start-up of the motor is avoided and replaced by a smooth and a low-stress speed ramp-up. The controller drives the motor in both directions and offers a braking mode without any external power management. Automotive applications for the controller include any brush type dc motor, such as seat motors, and many other body electronics applications. The self-isolated process makes the IC very cost effective. In addition, the circuit provides a flexible architecture to cost-effectively address a wide variety of applications. This paper will describe the process, key elements of the circuit design and provide an application example for the motor controller.
Integrated power H-bridge controller for 80-watt automotive DC motors
Integrierte Controller in Leistungs-H-Brücken für fahrzeugspezifische Gleichstrommotoren bis 80 W
2002
6 Seiten, 11 Bilder, 1 Quelle
Aufsatz (Konferenz)
Datenträger
Englisch
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