Synchronous rectifier circuit and power supply
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United States of America Patent
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Feb 28, 2006
Grant Date -
Jan 13, 2005
app pub date -
Jul 2, 2004
filing date -
Jul 2, 2003
priority date (Note) -
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Abstract
In a power supply of a synchronous rectification type, the self-turn on phenomenon of MOSFET is suppressed without increase of the drive loss to thereby improve the power efficiency. In a synchronous rectifier circuit, a threshold value of a commutation MOSFET is made higher than that of a rectification MOSFET and particularly a threshold value of a commutation MOSFET 3 is made 0.5V or more higher than that of a rectification MOSFET 2. The threshold value of the rectification MOSFET 2 is lower than 1.5V and the threshold of the commutation MOSFET 3 is higher than 2.0V.
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