IR1169S

4

www.irf.com

© 2013 International Rectifier

Nov 6, 2013

Description

IR1169 is a smart secondary-side driver IC designed to drive N-Channel power MOSFETs used as synchronous

rectifiers in isolated Flyback, Forward or Half-bridge converters. The IC can control one or more paralleled N-

MOSFETs to emulate the behavior of Schottky diode rectifiers. IR1169 works in both DCM and CCM operation

modes. The SYNC pin should be used in CCM mode to directly turn-off the MOSFET by a signal from secondary

or primary controller. The IC is designed to use simple capacitor coupling interface to communicate with primary

controller. In addition to the SYNC control, the drain to source voltage is sensed differentially to determine the

polarity of the current and turn the power switch on and off in proximity of the zero current transition. Ruggedness

and noise immunity are accomplished using an advanced blanking scheme and double-pulse suppression which

allow reliable operation in all operating modes.