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US 2009/0153123 A1Published application
Pwm controller and method therefor
AssigneeSemiconductor Components Industries, LLC
InventorJonathan P. Kraft
Life of this patent
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Abstract
In one embodiment, a PWM controller is configured to inhibit a drive signal responsively to a bulk input voltage remaining at a low value for a time interval.
Claims16
A PWM controller comprising:
- a first circuit configured to provide a drive signal used to regulate an output voltage to a desired value;
- a second circuit operably coupled to detect a bulk input voltage decreasing to a first value and responsively form a first control signal;
- and
- a third current operably coupled to receive the first control signal and to disable the drive signal responsively to the bulk input voltage remaining no greater than the first value for a time interval and operably coupled to inhibit disabling the drive signal and to reset the time interval responsively to the bulk input voltage increasing to a second value that is greater than the first value before the time interval expires.
1 more element
A method of forming a PWM controller comprising:
- configuring the PWM controller to form a drive signal used to regulate an output voltage to a desired value;
- and
- coupling a first circuit to sense a bulk input voltage decreasing to a first value and responsively decrease an operating frequency of the drive signal.
A method of forming a PWM controller comprising:
- configuring the PWM controller to form a drive signal used to regulate an output voltage to a desired value;
- and
- configuring the PWM controller to sense a bulk input voltage decreasing to no greater than a first value and to disable the drive signal responsively to the bulk input voltage remaining no greater than the first value for a time interval.
Dependencies are inferred from the claim text.