DC motor driver having output FETS that conduct to rectify output overvoltage and undervoltage transients
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United States of America Patent
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-
Mar 23, 1999
Grant Date -
N/A
app pub date -
Apr 28, 1998
filing date -
Apr 29, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A motor-winding driver circuit includes a high-side double-diffused metal-oxide-semiconductor (DMOS) field-effect transistor (FET) connected between a direct-current (DC) power supply node and a driver output node, and a low-side DMOS FET connected between the driver output node and ground. A high-side drive circuit and a low-side drive circuit regulate the driver output voltage to prevent a parasitic bipolar PNP transistor in the high-side FET from conducting, so that latchup is avoided. A parasitic N+/P-substrate diode in the low-side FET is also prevented from conducting. The low-side and high-side driver circuits have additional circuitry causing them to act as active clamp circuits during extreme over- or under-voltage conditions. A body-switching circuit connects the body of the high-side DMOS FET to the driver output node during normal operation, and connects the body to the DC supply node when the driver output voltage exceeds the DC source voltage.
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