Power control circuit performing soft start operation. power supply device, and electronic device
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United States of America Patent
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Dec 30, 2014
Issued Date -
N/A
app pub date -
Jun 21, 2010
filing date -
Jun 23, 2009
priority date (Note) -
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Abstract
A power control circuit includes a control circuit configured to perform a soft start operation before a power supply device performs a normal operation. The power control circuit also includes a counter circuit configured to divide a switching frequency of the power supply device in the normal operation, wherein the counter circuit measures a period of the soft start operation and when the period lasts for a set length, starts to divide the switching frequency, and wherein the power control circuit causes a comparator comprising the counter circuit to compare the frequency obtained by dividing the switching frequency with a reference frequency and corrects the switching frequency.
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