Switching regulator and control circuit thereof and input voltage detection method therefor
AssigneeRichtek Technology Corporation, R.O.C.
InventorsJo-Yu Wang, Wei-Jhih Wen
Life of this patent
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Abstract
The present invention discloses a switching regulator including: a power stage having an upper gate device and a lower gate device coupled with each other, for converting an input voltage to an output voltage and generating a phase voltage at a node between the upper gate device and the lower gate device; and a control circuit including: a switch operation circuit controlling the power stage, the switch operation circuit generating a test signal turning on the upper gate device for a period of time and then turning it off; and a comparator for generating a ready signal indicating that the input voltage is ready according to comparison between the phase voltage and a reference voltage after the upper gate device is turned off.
Claims11
A switching regulator, comprising:
- a power stage having an upper gate device and a lower gate device coupled with each other, for converting an input voltage to an output voltage and generating a phase voltage at a node between the upper gate device and the lower gate device;
- and
- a control circuit including:
- a switch operation circuit controlling the power stage, wherein before the power stage starts converting the input voltage to the output voltage, the switch operation circuit generates a test signal turning on the upper gate device for a period of time and then turning it off;
- and
- a comparator for generating a ready signal indicating that the input voltage is ready according to comparison between the phase voltage and a reference voltage after the upper gate device is turned off.
A control circuit of a switching regulator, the switching regulator including a power stage having an upper gate device and a lower gate device coupled with each other, for converting an input voltage to an output voltage and generating a phase voltage at a node between the upper gate device and the lower gate device, the control circuit comprising:
- a switch operation circuit controlling the power stage, wherein before the switching regulator starts converting the input voltage to the output voltage, the switch operation circuit generates a test signal turning on the upper gate device for a period of time and then turning it off;
- and
- a comparator for generating a ready signal indicating that the input voltage is ready according to comparison between the phase voltage and a reference voltage after the upper gate device is turned off.
An input voltage detecting method, comprising:
- providing a power stage having an upper gate device and a lower gate device coupled with each other, for converting an input voltage to an output voltage and generating a phase voltage at a node between the upper gate device and the lower gate device;
- and
- before starting converting the input voltage to the output voltage, confirming whether the input voltage is ready by:
- generating a test signal turning on the upper gate device for a period of time and then turning it off;
- and
- comparing the phase voltage with a reference voltage after the upper gate device is turned off, wherein when the phase voltage is negative and its absolute value is higher than the reference voltage, a ready signal is generated for indicating that the input voltage is ready.
Dependencies are inferred from the claim text.