Switching regulator, control circuit and control method thereof, and electronic apparatus
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United States of America Patent
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Dec 29, 2015
Grant Date -
Mar 13, 2014
app pub date -
Sep 13, 2013
filing date -
Sep 13, 2012
priority date (Note) -
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Abstract
A control circuit for controlling a switching transistor and a synchronous rectifying transistor of a switching regulator includes: a bottom detection comparator configured to assert an on signal; an off signal generator configured to assert an off signal; a zero current detector configured to assert a zero current detection signal; and a control logic part configured to receive the on signal, the off signal and the zero current detection signal and generate a control signal such that the control circuit (i) transitions to a first state where, when the on signal is asserted, (ii) transitions to a second state where, when the off signal is asserted, and (iii) transitions to a third state where, when the zero current detection signal is asserted; In the third state, the control logic part reduces an operation current of at least a portion of the control circuit.
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