Patent ID: 11955957
Assignee: INFINEON TECHNOLOGIES AG
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A circuit for driving an electronic switch, the circuit comprising:
a control circuit configured to:
trigger a switch-on and a switch-off of the electronic switch in accordance with an input signal,
trigger the switch-off of the electronic switch in response to an under-voltage signal signaling an under-voltage state, and
trigger the switch-off of the electronic switch in response to an over-current signal signaling an over-current state;

an under-voltage detection circuit configured to:
signal the under-voltage state when a supply voltage received at a supply node is below an under-voltage threshold value, wherein the under-voltage threshold value depends on a load current passing through the electronic switch, and
increase the under-voltage threshold value from a first under-voltage value to a second under-voltage value when a current sense signal representing the load current passing through the electronic switch reaches or exceeds a first current threshold value; and

a current monitoring circuit configured to signal the over-current state based on the current sense signal and a current-time characteristic which depends on the supply voltage received at the supply node, wherein the current monitoring circuit comprises:
a filter having a time constant that is configured to be modified based on the supply voltage, and
the filter is configured to receive an first signal that depends on the current sense signal representing the load current passing through the electronic switch.