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3.3V/20A post-regulator driven by the NCP4331

Posted: 03 Sep 2008     Print Version  Bookmark and Share

Keywords:NCP4331-driven  post-regulators  magnetic amplifier  conduction losses 

As of today, magnetic amplifier post-regulators (mag amp) are very popular for ATX application. However, they are the seat of important conduction losses that limit their interest in the raging struggle for energy savings.

NCP4331-driven post-regulators represent a major leap towards efficiency. Like mag amp, they can be viewed as buck converters with the ability to operate from a pulsed input voltage. However, NCP4331 driven post-regulators dramatically improves the efficiency of the power processing since:

  • They significantly reduce the conduction losses as the mag amp saturable coil is removed and the diodes are replaced by low RDS(on) N-MOSFETs (synchronous rectification)

  • The switching losses are minimised since a smart sequencing softens three out of the four switching transitions of the MOSFETs.

    This application note proposes a systematic process to design NCP4331 driven post-regulators. As an example, a 3.3V/20A board has been built and has been coupled to a 2-switch forward converter for testing.

    View the PDF document for more information.

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