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Analysis of a Self Turn-on Phe
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2009-11-26
靓仔峰
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Analysis of a Self Turn-on Phenomenon on the Synchronous Rectifier in a DC-DC Converter:In the buck converter with MOS Fets, the low side switch,
which must be still in cutoff state, becomes turn-on when the
high side switch is turned-on and the current flows through the
circuit of the power supply, the high side switch and the low side
switch. We call this phenomenon self turn-on. The power
dissipation by this current becomes higher when the switching
frequency of the converter is high as MHz. This self turn-on
occurs easily in the converter of low output voltage and high
voltage conversion ratio.
We present the principle of self turn-on phenomenon on
circuit simulation and experimental results.
which must be still in cutoff state, becomes turn-on when the
high side switch is turned-on and the current flows through the
circuit of the power supply, the high side switch and the low side
switch. We call this phenomenon self turn-on. The power
dissipation by this current becomes higher when the switching
frequency of the converter is high as MHz. This self turn-on
occurs easily in the converter of low output voltage and high
voltage conversion ratio.
We present the principle of self turn-on phenomenon on
circuit simulation and experimental results.
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