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US 7,623,361 B2Granted
Power supply soft start controller with no output voltage undershoot when transitioning from skip cycle mode to normal mode
AssigneeSemiconductor Components Industries, LLC
InventorsChristophe Basso, Jefferson W. Hall, Petr Kadanka
Life of this patent
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Abstract
In one embodiment, a power supply controller is configured to reset or override a soft-start reference signal responsively to the output voltage decreasing to a value that is less than a desired regulated value of the output voltage.
Claims20
A soft start circuit of a power supply controller comprising:
- a soft-start reference generator configured to form a soft-start reference signal responsively to an output voltage of a power supply system increasing to a first value that is greater than a regulated value of the output voltage;
- and
- a soft-start override circuit configured to receive a first signal that is representative of the output voltage and configured to override a value of the soft-start reference signal responsively to the output voltage decreasing to a second value that is less than the regulated value.
A method of forming a power supply controller comprising:
- configuring the power supply controller to form a drive signal to control a power switch to regulate an output voltage to a regulated value;
- configuring the power supply controller to receive a feedback signal that is representative of the output voltage;
- configuring the power supply controller to form a soft-start reference signal responsively to a first value of the output voltage that is greater than the regulated value;
- and
- configuring the power supply controller to inhibit the soft-start reference signal responsively to a second value of the output voltage that is less than the regulated value.
2 more elements
A power supply control method comprising:
- forming a drive signal to operate a power switch to regulate an output voltage of a power supply system to a regulated value;
- forming a soft-start reference signal to limit a peak value of current through the power switch responsively to a first value of the output voltage that is greater than the regulated value;
- and
- changing a value of the soft-start reference signal responsively to a second value of the output voltage that is less than the regulated value.
1 more element
Dependencies are inferred from the claim text.