Browse Prior Art Database

CURRENT LIMITING CIRCUIT

IP.com Disclosure Number: IPCOM000005703D
Original Publication Date: 1988-Oct-01
Included in the Prior Art Database: 2001-Oct-29

Publishing Venue

Motorola

Related People

Authors:
David Soo Steve McKinnis

Abstract

A power MOSFET current limiting circuit for monitoring the current flowing through a current sensing field effect transistor (SENSFET), and turning off the SENSFET if the current reaches a selected maximum magnitude is shown in the figure. A SENSFET M4, is connected to drive a load L, with a gate drive circuit pro- viding the gate voltage to turn the SENSFET on and off. A portion of the load current flowing through M4 is fed back to a monitoring circuit. Since the portion of current being fed back is indicative of the full load current, it can be used to determine when the load current has exceeded a maximum allowable magnitude.