Browse Prior Art Database

ANALOG SIGNAL RECOVERY THROUGH LOSSLESS CURRENT SENSING

IP.com Disclosure Number: IPCOM000005956D
Original Publication Date: 1990-Oct-01
Included in the Prior Art Database: 2001-Nov-20
Document File: 2 page(s) / 79K

Publishing Venue

Motorola

Related People

Authors:
Donn Dengel

Abstract

Most applications for lossless current sensing involve detection of overcurrent conditions in power switching cir- cuits. Current-sensing MOSFETs contain two current sensing terminals (MIRROR and KELVIN) in addition to the DRAIN, SOURCE and GATE terminals. A voltage which is linearly proportional to the drain current appears at the MIRROR and KELVIN terminals. These terminals are connected to external protection circuits which turn off the MOSFET when ex- cessive drain current is detected to prevent damage to the MOSFET and its load.