Patent ID: 6400203
Filing Date: 2002-06-04
Classification: H02H,H03K

Abstract:
A current limit circuit having first and second power input terminals and an output terminal for limiting the current on the output terminal, comprising:an output transistor and a second transistor, each having first and second terminals and a control terminal, the current between the first and second terminals being responsive to the voltage between the respective control terminal and first terminal; a differential transconductance amplifier; a sense resistor and a second resistor; a capacitor; the sense resistor being coupled between the first power input terminal and the second terminal of the output transistor, the first terminal of the output transistor being coupled to the output terminal; the second resistor being coupled between a voltage and the control terminal of the output transistor; the second transistor having its second terminal coupled to the control terminal of the output transistor, and its first terminal coupled to the second power input terminal; the transconductance amplifier having inputs coupled to the second terminal of the output transistor and a reference voltage and an output coupled to the control terminal of the second transistor; the capacitor being coupled between the control terminal of he second transistor and the second power input terminal.