EMULATED CURRENT RAMP FOR DC-DC CONVERTER
First Claim
1. A voltage converter, comprising:
- a control circuit coupled to receive an enable signal, the control circuit producing a first control signal to provide a load current to an output terminal in response to the enable signal;
a sample and hold circuit arranged to produce a third control signal to emulate the load current and a fourth control signal to sample and hold a value of the third control signal; and
a comparator circuit arranged to compare the third and fourth control signals and produce the enable signal in response to a result of the comparison.
1 Assignment
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Accused Products
Abstract
A voltage converter (FIG. 4) for a power supply circuit is disclosed. The voltage converter comprises a control circuit (400) coupled to receive an enable (EN) signal. The control circuit produces a first control signal (PWM) to provide a load current (IL) in response to the enable signal. A sample and hold circuit (408) is arranged to produce a third control signal (CSP) to emulate the load current and a fourth control signal (CSN′) to sample and hold value of the third control signal. A comparator circuit (416) is arranged to compare the third and fourth control signals and produce the enable signal in response to a result of the comparison.
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Citations
20 Claims
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1. A voltage converter, comprising:
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a control circuit coupled to receive an enable signal, the control circuit producing a first control signal to provide a load current to an output terminal in response to the enable signal; a sample and hold circuit arranged to produce a third control signal to emulate the load current and a fourth control signal to sample and hold a value of the third control signal; and a comparator circuit arranged to compare the third and fourth control signals and produce the enable signal in response to a result of the comparison. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A power supply, comprising:
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a first output transistor having a first control terminal and having a current path coupled between a supply voltage and an output terminal; a second output transistor having a second control terminal and having a current path coupled between the output terminal and a reference terminal; a control circuit coupled to receive an enable signal, the control circuit producing a first control signal at the first control terminal in response to the enable signal, and producing a second control signal at the second control terminal; a sample and hold circuit arranged to produce a third control signal to emulate the load current and a fourth control signal to sample and hold a value of the third control signal; and a comparator circuit arranged to compare the third and fourth control signals and produce the enable signal in response to a result of the comparison. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of regulating an output voltage, comprising:
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producing an on-time signal having a first duration in response to an enable signal; producing a load current in response to the on-time signal; producing a first voltage signal emulating the load current; producing a second voltage signal having a sampled value of the first voltage signal; comparing the first and second voltage signals; and producing the enable signal in response to a result of the step of comparing. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification