DC--DC converting method and apparatus
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United States of America Patent
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Apr 10, 2007
Grant Date -
Dec 22, 2005
app pub date -
Jun 16, 2005
filing date -
Jun 16, 2004
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A DC-DC converting apparatus including a step-up and step-down circuit stepping up/down an input voltage to generate an output voltage and a PWM control circuit. The PWM control circuit generates an error signal, first to third voltages, a first triangular wave signal varying between the first and second voltages, and a second triangular wave signal varying between the third voltage and a fourth voltage determined based on the first to third voltages. The PWM control circuit compares the error signal with the first and second triangular wave signals and causes the step-up and step-down circuit to step up/down the input voltage based on the comparison. The first to fourth voltages V1 to V4 satisfy V1
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