Soft-start method for a switching regulator
AssigneeAudiowise Technology Inc.
InventorKUEI-JU CHIANG
Life of this patent
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Abstract
A soft-start method for a switching regulator is provided. In the soft-start method, a first gate drive signal for limiting an inrush current is provided, by a control circuit, to a switching circuit in a first soft-start stage. After the control circuit determines that a mode switching condition is satisfied according to an output voltage and an output current, a second drive signal for increasing a rise rate of an output voltage is provided to the switching circuit so that the output voltage increases with a faster rise rate and reaches a predetermined voltage at a second soft-start stage.
Claims15
A soft-start method for a switching regulator, comprising:
- providing a first gate drive signal having a plurality of first on-off cycles to a switching circuit, by a control circuit, so as to generate an output voltage and an output current;
- detecting the output voltage by a voltage feedback circuit and the output current by a current feedback circuit;
- determining whether or not a mode switching condition is satisfied or not according to the output voltage and the output current that are obtained by the control circuit;
- and
- when the mode switching condition is satisfied, providing a second gate drive signal having a plurality of second on-off cycles to the switching circuit, by the control circuit, so that the output voltage is increased to a predetermined voltage.
A soft-start method for a switching regulator, comprising:
- providing a pulse skip modulation (PSM) signal having a plurality of first on-off cycles to a switching circuit at a first soft-start stage, by a control circuit, so as to generate an output voltage and an output current;
- determining whether a switching mode condition is satisfied or not according to the output voltage and the output current;
- and
- when the switching mode condition is satisfied, providing a pulse width modulation (PWM) signal having a plurality of second on-off cycles to the switching circuit at a second soft-start stage so that the output voltage is increased to a predetermined voltage, wherein the first soft-start stage is prior to the second soft-start stage.
Dependencies are inferred from the claim text.