SOFT SHUTDOWN FOR ISOLATED DRIVERS

摘要

An apparatus for controlling a high-power drive device external to a package of a motor drive circuit includes a motor drive circuit. The motor drive circuit includes a driver to control the high-power drive device based on a first reference voltage, a second reference voltage, and a control signal based on a received control signal. A fault circuit generates a failure indicator based on a voltage across terminals of the high-power drive device. A fault condition is based on the failure indicator. A first terminal coupled to the driver charges a node of the high-power drive device over a first length of time in response to an absence of the fault condition and a first level of the control signal. A second terminal coupled to the driver discharges the node over a second length of time different from the first length of time.

主权项

1. An apparatus for controlling a high-power drive device external to a package of a motor drive circuit, the apparatus comprising:
the motor drive circuit comprising:
a driver configured to control the high-power drive device at least partially based on a first reference voltage, a second reference voltage, and a control signal based on a received control signal received by the motor drive circuit;a fault circuit configured to generate a failure indicator based on a voltage across terminals of the high-power drive device, a fault condition being at least partially based on the failure indicator;a first terminal coupled to the driver and configured to charge a node of the high-power drive device over a first length of time in response to an absence of the fault condition and a first level of the control signal; anda second terminal coupled to the driver and configured to discharge the node of the high-power drive device over a second length of time, the second length of time being different from the first length of time.