Method of forming a power supply control and device therefor
First Claim
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1. A method of forming a power supply controller comprising:
- configuring the power supply controller to form a PWM drive signal operable to control a power switch to form a current through an inductor of a power supply system; and
configuring the power supply controller to reduce an operating frequency of the power supply controller responsively to the power supply controller operating in a discontinuous conduction mode.
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Abstract
In one embodiment, a power supply controller has a variable frequency oscillator that is used for controlling a PWM controller. The power supply controller varies a frequency of the variable frequency oscillator.
73 Citations
20 Claims
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1. A method of forming a power supply controller comprising:
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configuring the power supply controller to form a PWM drive signal operable to control a power switch to form a current through an inductor of a power supply system; and
configuring the power supply controller to reduce an operating frequency of the power supply controller responsively to the power supply controller operating in a discontinuous conduction mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A power supply control method comprising:
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forming a control signal that is representative of a substantially zero crossing of a current through an energy storage inductor of a power supply system;
using the control signal to control a frequency of a clock signal of a variable frequency oscillator; and
applying the clock signal to a PWM controller of the power supply system wherein the PWM controller responsively initiates asserting a PWM drive signal of the power supply system responsively to the clock signal. - View Dependent Claims (11, 12, 13, 14)
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15. A power supply controller comprising:
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a PWM controller coupled to receive a clock signal and responsively generate a PWM drive signal operable to enable a power switch to generate a current through an inductor; and
a variable frequency oscillator of the power supply controller configured to generate the clock signal and change an operating frequency of the clock signal responsively to the current through the inductor becoming substantially zero. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification