Method and apparatus for a switch mode power supply that generates a high pulse width modulation gain while maintaining low noise sensitivity
AssigneePower Integrations, Inc.
InventorBalu Balakrishnan
Life of this patent
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Abstract
A power supply with high pulse width modulation gain and low noise sensitivity has been disclosed. In one embodiment, a power supply includes a regulator circuit controlling a power switch. The regulator circuit includes a control input that receives a current, which is the sum of a consumption current of the regulator and a feedback current. The consumption current of the regulator is varied as a function of the duty cycle of the power switch. The feedback current is the current in a shunt regulator, which is control current in excess of the internal consumption of the regulator.
Claims44
A regulator circuit, comprising:
- a control terminal regulator circuit including a control terminal coupled to receive a control current that includes a feedback current and a consumption current of the regulator circuit;
- and
- a power switch control circuit coupled to the control terminal regulator circuit and to a control terminal of a power switch, the power switch control circuit adapted to adjust a duty cycle at which the power switch is switched in response to the feedback current, wherein the consumption current of the regulator circuit is increased during an on-time of the power switch in response to the duty cycle at which the power switch is switched.
A regulator circuit, comprising:
- a power switch coupled between first and second terminals;
- a control terminal regulator circuit including a control terminal coupled to receive an control current, the control current including a consumption current of the regulator circuit and a feedback current;
- and
- a power switch control circuit coupled to the control terminal regulator circuit and a control terminal of the power switch, the power switch control circuit adapted to control a duty cycle of the power switch in response to the feedback current, the consumption current of the regulator circuit increased during an on-time of the power switch in response to the duty cycle of the power switch.
A regulator circuit, comprising:
- a control terminal regulator circuit including a control terminal coupled to receive a control current that includes a feedback current and a subtraction current of the regulator circuit;
- and
- a power switch control circuit coupled to the control terminal regulator circuit and to a control terminal of a power switch, the power switch control circuit adapted to adjust a duty cycle at which the power switch is switched in response to the feedback current, wherein the subtraction current of the regulator circuit is increased during an on-time of the power switch in response to the duty cycle at which the power switch is switched.
A regulator circuit, comprising:
- a control terminal regulator circuit including a control terminal coupled to receive an input signal that includes a feedback signal and a subtraction signal of the regulator circuit;
- and
- a power switch control circuit coupled to the control terminal regulator circuit and to a control terminal of a power switch, the power switch control circuit adapted to adjust a duty cycle at which the power switch is switched in response to the feedback signal, wherein the subtraction signal of the regulator circuit is increased during an on-time of the power switch in response to the duty cycle at which the power switch is switched.
Dependencies are inferred from the claim text.