Secondary Synchronous Rectifier Driver for Forward Converters

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Overview

The NCP81178 is a secondary-side synchronous rectifier driver designed for isolated power converters, especially actively clamped forward or flyback, and asymmetric half bridge converters. The NCP81178 drives two N-channel MOSFETs on the secondary side in a complementary manner. It accepts a PWM signal that can be derived from the secondary winding or an auxiliary winding on the main power transformer. It can also take a PWM from the primary side controller through a pulse transformer or other isolator.

  • Isolated DC/DC power
  • servers silver box supplies
  • 48V server, telecom and datacom
  • servers
  • datacom
  • isolated bricks
  • N-channel synchronous rectifier MOSFET driver
  • Primary shutdown detection
  • Internally generated PWM threshold voltage with external programmability
  • 4.5A/3.8A sink and 3A source capability
  • 3mm by 3mm DFN package

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NCP81178MNTXG

Active

Pb

A

H

P

DFN-10

1

260

REEL

3000

N

14

1.25

0.03

-40

125

$1.0

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