Methods and Apparatus for Power Switch Fault Protection

摘要

In described examples, a switch has: a first current handling terminal coupled to a supply source terminal; and a second current handling terminal coupled to an output terminal. A comparator has: a first input coupled to the second current handling terminal; and a second input. A voltage reference source has: a first terminal coupled to the first current handling terminal; and a second terminal coupled to the second input of the comparator. A slew rate detector has an input coupled to the second current handling terminal. A switch controller has: a first input coupled to the comparator output; and a second input coupled to an output of the slew rate detector. The switch controller is coupled to output a signal to cause the switch to open when the comparator detects an over-current condition through the switch while the slew rate detector detects a negative slew rate.

主权项

1. An integrated circuit, comprising:
a supply source terminal coupled to receive a current from a supply source; a switch having: a first current handling terminal coupled to the supply source terminal; a second current handling terminal coupled to an output terminal; and a control terminal; a comparator having: a first input coupled to the second current handling terminal; a second input; and a comparator output; a voltage reference source having: a first terminal coupled to the first current handling terminal; and a second terminal coupled to the second input of the comparator; a slew rate detector having: an input coupled to the second current handling terminal; and an output; and a switch controller having: a first input coupled to the comparator output; a second input coupled to the output of the slew rate detector; and a switch controller output coupled to the control terminal.