Power control device capable of detecting the condition of the sensing resistor
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United States of America Patent
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Dec 25, 2018
Grant Date -
Nov 22, 2018
app pub date -
May 8, 2018
filing date -
May 22, 2017
priority date (Note) -
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Abstract
A power control device includes a switch control circuit, a first resistor, a second resistor, a third resistor, a sense node, a first comparator, a second comparator, a transformation circuit, and a logic control circuit. The switch control circuit outputs a driving signal according to a set signal and a reset signal. The first resistor, the second resistor, and the third resistor generate a reference voltage according to a feedback current. The sense node receives a current sample voltage. The first comparator outputs a first control signal according to the current sample voltage and the reference voltage. The transformation circuit outputs a short detection voltage according to the current sample voltage. The second comparator outputs the second control signal according to the current sample voltage and the short detection voltage. The logic control circuit gate outputs the reset signal according to the first control signal and the second control signal.
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