IR1161LPBF

3

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June 1, 2015

Description

The IR1161 is a synchronous rectification control IC designed to drive an N-Channel power MOSFET in a

secondary output rectifier circuit. The MOSFET gate is switched on and off to bypass its body diode during the of

the conduction period to minimize power dissipation, remaining off during the blocking period. The drain to source

voltage is accurately sensed to determine the direction and magnitude of the current allowing the IR1161 to turn

the MOSFET on and off at close to zero current.

An integrated cycle-by-cycle minimum on time (MOT) protection circuit automatically detects a no load condition

and turns off the gate driver output preventing negative current from flowing through the MOSFET.

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

suppression, which allows reliable operation in all operating modes.