PWM CLOCK GENERATION SYSTEM AND METHOD TO IMPROVE TRANSIENT RESPONSE OF A VOLTAGE REGULATOR
First Claim
1. A pulse control clock generator for a voltage regulator, comprising:
- a comparator which compares a ramp voltage with a compensation voltage and which provides a corresponding pulse control signal, wherein said compensation voltage is indicative of an output voltage error;
a window circuit which adds a window voltage to said compensation voltage to provide a hysteretic voltage;
a filter circuit which filters said hysteretic voltage to provide a filtered hysteretic voltage, wherein a difference between said compensation voltage and said filtered hysteretic voltage is said window voltage during a steady state condition and wherein said difference is reduced in response to a change of said compensation voltage indicative of a load increase;
a ramp circuit which provides a repetitive ramp voltage which ramps between said filtered hysteretic voltage and said compensation voltage based on said pulse control signal; and
a current circuit which increases a slope of said ramp voltage in response to said load increase.
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Accused Products
Abstract
A pulse control clock generator for a voltage regulator including a comparator, a window circuit, a filter circuit, a ramp circuit, and a current circuit. The comparator compares a ramp voltage with a compensation voltage and provides a corresponding pulse control signal. The compensation voltage is indicative of output voltage error. The window circuit adds a window voltage to the compensation voltage to provide a hysteretic voltage. The filter circuit filters the hysteretic voltage to provide a filtered hysteretic voltage, such that a difference between the compensation voltage and the filtered hysteretic voltage is reduced in response to a load increase. The ramp circuit provides a repetitive ramp voltage which ramps between the filtered hysteretic voltage and the compensation voltage based on the pulse control signal. The current circuit increases a slope of the ramp voltage in response to the load increase.
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Citations
20 Claims
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1. A pulse control clock generator for a voltage regulator, comprising:
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a comparator which compares a ramp voltage with a compensation voltage and which provides a corresponding pulse control signal, wherein said compensation voltage is indicative of an output voltage error; a window circuit which adds a window voltage to said compensation voltage to provide a hysteretic voltage; a filter circuit which filters said hysteretic voltage to provide a filtered hysteretic voltage, wherein a difference between said compensation voltage and said filtered hysteretic voltage is said window voltage during a steady state condition and wherein said difference is reduced in response to a change of said compensation voltage indicative of a load increase; a ramp circuit which provides a repetitive ramp voltage which ramps between said filtered hysteretic voltage and said compensation voltage based on said pulse control signal; and a current circuit which increases a slope of said ramp voltage in response to said load increase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A voltage regulator, comprising:
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at least one switching circuit for converting at least one input voltage to a regulated output voltage, wherein each of said at least one switching circuit is controlled by a corresponding one of at least one pulse-width modulation (PWM) clock signal; an error amplifier which provides a compensation voltage indicative of error of said regulated output voltage; and a pulse control clock generator, comprising; a comparator which compares a ramp voltage with said compensation voltage and which provides a pulse control clock signal; PWM logic which converts said pulse control clock signal into said at least one PWM clock signal; a window circuit which adds a window voltage to said compensation voltage to provide a hysteretic voltage; a filter circuit which filters said hysteretic voltage to provide a filtered hysteretic voltage, wherein a difference between said compensation voltage and said filtered hysteretic voltage is said window voltage during a steady state condition and wherein said difference is reduced in response to a change of said compensation voltage indicative of a load increase; a ramp circuit which provides a ramp voltage which ramps between said filtered hysteretic voltage and said compensation voltage as controlled by said pulse control clock signal; and a current circuit which increases the slope of said ramp voltage in response to said load increase. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of generating a pulse control signal for a voltage generator, comprising:
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comparing a ramp voltage with a compensation voltage and providing a corresponding pulse control signal, wherein the compensation voltage is indicative of output voltage error; providing a window voltage and adding the window voltage to the compensation voltage to provide a hysteretic voltage; filtering the hysteretic voltage to provide a filtered hysteretic voltage, wherein a difference between the compensation voltage and the filtered hysteretic voltage is the window voltage during a steady state condition and wherein the difference is reduced in response to a change of the compensation voltage indicative of a load increase; providing a repetitive ramp voltage which ramps between the filtered hysteretic voltage and the compensation voltage; and increasing a slope of the ramp voltage in response to a load increase of the voltage generator. - View Dependent Claims (19, 20)
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Specification