Power Supply Apparatus and Electronic Device Provided With Same
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United States of America Patent
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Issued Date -
Mar 1, 2012
app pub date -
May 18, 2010
filing date -
May 19, 2009
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A power supply apparatus A according to the present invention comprises a drive control circuit for generating an on/off control signal of an output transistor; an overcurrent protection circuit for directly or indirectly monitoring a coil current and generating an overcurrent detection signal; and a soft-start control circuit for suppressing a rise in an output voltage by using a soft-start voltage for starting an increase slowly after startup of the power supply apparatus, wherein, when the coil current is in an overcurrent state, the drive control circuit repeats a forced reset operation of the on/off control signal in accordance with the overcurrent detection signal, and a set operation of the on/off control signal in accordance with a clock signal of a predetermined frequency, as a pulse-by-pulse overcurrent protection operation; and the soft-start control circuit gradually reduces the soft-start voltage as a reset operation in accordance with the overcurrent detection signal.
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