Voltage-regulator and power supply having current sharing circuit
First Claim
1. A voltage-regulator having current-sharing circuit, comprising at least an input terminal, an output terminal and an enabling terminal, wherein said enabling terminal enables or disables said voltage-regulator and provides a current-sharing control interface, comprising:
- a pass transistor, having a first terminal connected to said input terminal of said voltage-regulator to receive an input voltage;
a second terminal connected to said output terminal of said voltage-regulator to provide an output voltage and an output current to said output terminal; and
a third terminal;
a band-gap unit, for generating a reference voltage;
a feedback control circuit, coupled to said output terminal of said voltage-regulator and said pass transistor for detecting said output current, outputting a current-sense signal in response to said output current, and regulating and outputting a control signal to said third terminal of said pass transistor for controlling said voltage-regulator in response to a reference signal; and
a current-sharing unit, coupled to said enabling terminal and said feedback control circuit for generating a bus signal in response to said current-sense signal and said reference voltage and generating said reference signal in response to said reference voltage, said bus signal and said current-sense signal.
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Accused Products
Abstract
The present invention proposes a voltage-regulator and a power supply having a current-sharing circuit. The voltage-regulator capable of current sharing uses an enabling terminal as a current-sharing control interface. A pass transistor supplies an output voltage and an output current to an output terminal of the voltage-regulator. A feedback control circuit generates a control signal to control the pass transistor in response to a reference voltage. A current-sharing unit is coupled to the enabling terminal and the feedback control circuit for generating a bus signal in response to the current-sense signal and the reference voltage and generating the reference signal in response to the reference voltage, the bus signal and the current-sense signal.
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Citations
18 Claims
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1. A voltage-regulator having current-sharing circuit, comprising at least an input terminal, an output terminal and an enabling terminal, wherein said enabling terminal enables or disables said voltage-regulator and provides a current-sharing control interface, comprising:
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a pass transistor, having a first terminal connected to said input terminal of said voltage-regulator to receive an input voltage;
a second terminal connected to said output terminal of said voltage-regulator to provide an output voltage and an output current to said output terminal; and
a third terminal;
a band-gap unit, for generating a reference voltage;
a feedback control circuit, coupled to said output terminal of said voltage-regulator and said pass transistor for detecting said output current, outputting a current-sense signal in response to said output current, and regulating and outputting a control signal to said third terminal of said pass transistor for controlling said voltage-regulator in response to a reference signal; and
a current-sharing unit, coupled to said enabling terminal and said feedback control circuit for generating a bus signal in response to said current-sense signal and said reference voltage and generating said reference signal in response to said reference voltage, said bus signal and said current-sense signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A voltage-regulator with a current-sharing circuit having at least an input terminal, an output terminal and an enabling terminal, wherein said enabling terminal is used to control said voltage-regulator for enabling or disabling and provide a current-sharing interface, comprising:
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a pass transistor, having a first terminal connected to said input terminal of said voltage-regulator to receive an input voltage;
a second terminal connected to said output terminal of said voltage-regulator to provide an output voltage and an output current to said output terminal; and
a third terminal;
a feedback control circuit, coupled to said output terminal of said voltage-regulator to regulate and output a control signal to said third terminal of said pass transistor in response to a reference signal for controlling an output from said voltage-regulator; and
a current-sharing unit, coupled to said enabling terminal and said feedback control circuit for generating said reference signal and regulating said control signal. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A power supply having a current-sharing circuit having at least an input terminal, an output terminal and an enabling terminal, comprising:
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an output device, for providing an output voltage and an output current to said output terminal of said power supply;
a feedback control circuit, coupled to said output terminal of said power supply and said output device for detecting said output current, outputting a current-sense signal in response to said output current, and regulating and outputting a control signal to said output device in response to a reference signal to control an output of said power supply; and
a current-sharing unit, coupled to said current-sharing terminal and said feedback control circuit for generating a bus signal according to said current-sense signal and a reference voltage and generating said reference signal in response to said reference voltage, said bus signal and said current-sense signal. - View Dependent Claims (17, 18)
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Specification