Protection circuit and switching power supply
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United States of America Patent
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Oct 24, 2017
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N/A
app pub date -
Jan 16, 2017
filing date -
Feb 1, 2016
priority date (Note) -
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Abstract
To provide a protection circuit that can reduce output voltage that is output from a switching power supply greatly when temperature rises. A protection circuit includes a comparator that supplies detection current based on voltage Vsens that a temperature sensor outputs in case that voltage Vsens that the temperature sensor outputs exceeds voltage Vref of predetermined potential, a control circuit that supplies control current that the control circuit increases detection current that the comparator supplies exponentially, and a constant voltage circuit reduces output voltage Vout that is output from a switching power supply based on control current that the control circuit supplies.
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