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Implement H-bridges to power automotive SoCs

Posted: 01 Jul 2008 ?? ?Print Version ?Bookmark and Share

Keywords:automotive motor-drivers? H-bridges? stepper motor actuator? headlamps?

The wide diversity of automotive motor drivers, including those used for heating, ventilation and air conditioning, headlamp, seat positioning, window and mirror applications, requires circuits that do more than just switch the motor on and off. The drivers have to control direction, torque, speed, acceleration and deceleration to sense position and to detect stall conditions. In addition, they have to withstand severe environmental conditions, such as ESD, over- and reverse-voltages, wide temperature ranges, and EMI. Finally, since some applications are safety-critical, they also have to fulfill very high quality and reliability demands.

Integrating the drive-control functions on an SoC is a difficult task, because the chips have to operate at high temperatures, high voltages (up to 80V) and handle up to multi-amp currents.

This article describes design implementation of H-bridges in "smart power" technology for an automotive application: a stepper motor actuator for positioning headlamps.

View the PDF document for more information.

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