Load drive device

摘要

The load drive device of the present invention comprises a load drive unit for switching on/off output current that flows to an inductive load; and an overcurrent protection circuit for detecting whether the output current is in an overcurrent state, wherein the load drive unit has an output transistor connected to one end of the inductive load; and a pre-driver for generating a control signal of the output transistor in accordance with an input signal, and the pre-driver has a first drive unit for switching on/off the output transistor during normal operation; and a second drive unit for switching off the output transistor more slowly than the first drive unit during overcurrent protection operation.

主权项

1. A load device comprising:
a load drive unit for switching on/off an output current that flows to an inductive load; an overcurrent protection circuit for detecting whether the output current is in an overcurrent state; and a mask time generation circuit for instructing the load drive unit to carry out overcurrent protection operation when an overcurrent state of the output current has continued for a predetermined mask time, wherein the load drive unit comprises:
an output transistor connected to one end of the inductive load; anda pre-driver for generating a control signal of the output transistor in accordance with an input signal, wherein the pre-driver switches off the output transistor more slowly during overcurrent protection operation than during normal operation, and wherein the load drive unit has an input signal breaker for cutting off the input signal without waiting for the mask time to elapse when an overcurrent state of the output current has been detected.