Switching power supply control
AssigneeSemiconductor Components Industries, LLC
InventorTod F. Schiff
Life of this patent
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Abstract
A switching power supply controller includes a comparator to compare a feedback signal to a first limit and a second limit, one of which includes a ramp. Limit generators may be used to generate limit signals in response to power supply signals, control signals, and/or output signals. An error amplifier may be used to generate the feedback signal in response to an output signal and an input control signal. A switching power supply may alternatively include an oscillator that shifts the switching frequency in response to the input control signal.
Claims25
A switching power supply controller comprising:
- a first comparator to compare a feedback signal to a first limit to set a flip-flop to a first operating state of the power supply controller and a second comparator to compare the feedback signal to a second limit to set the flip-flop to a second operating state of the power supply controller, wherein the first limit comprises a ramp.
A switching power supply controller comprising:
- a comparator to compare a feedback signal to a first limit to set a first operating state of the power supply controller and to a second limit to set a second operating state of the power supply controller, wherein the first limit comprises a ramp;
- a first limit generator coupled to the comparator to generate the first limit in response to a power supply signal, an input control signal, and/or an output signal;
- a second limit generator coupled to the comparator to generate the second limit in response to a power supply signal and/or an input control signal;
- and
- an error amplifier coupled to the comparator to generate the feedback signal in response to an output signal and an input control signal.
A method comprising:
- operating a switching power supply between first and second states in order to regulate an output voltage by comparing a feedback signal to a first limit to set a modulation signal used to regulate the output voltage and comparing the feedback signal to a second limit to reset the modulation signal, wherein the second limit is a ramp.
A switching power supply controller comprising:
- a means for comparing an error signal to a bias signal and responsively setting a modulation signal used to regulate an output voltage;
- and
- a separate means for comparing the error signal to a ramp signal and responsively resetting the modulation signal.
Dependencies are inferred from the claim text.