CONSTANT-VOLTAGE POWER CIRCUIT
First Claim
1. A constant-voltage power circuit comprising:
- a control voltage output circuit receiving a reference voltage and a divided voltage dividing an output voltage, and outputting a control voltage in accordance with the difference between the reference voltage and the divided voltage;
an output circuit receiving the control voltage to generate a stabilized output voltage from a high-potential-side power supply voltage;
a first P-type MOS transistor carrying a current from a node of the output voltage;
a capacitor connected between the node of the output voltage and a supply node of low-potential-side power supply voltage; and
a P-type MOS transistor current control circuit controlling a gate of the first P-type MOS transistor so that a current flowing through the first P-type MOS transistor becomes a constant value.
1 Assignment
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Accused Products
Abstract
A differential amplifier receives a reference voltage and a divided voltage dividing an output voltage, and outputs a control voltage in accordance with the difference between the reference voltage and the divided voltage. The control voltage output from the differential amplifier is supplied to an output amplifier. The output amplifier generates a stabilized output voltage from a high-potential-side power supply voltage in accordance with the control voltage. A P-type MOS transistor is connected to a node of the output voltage, and the MOS transistor carries a current from the node of the output voltage. A current control circuit controls a gate of the P-type MOS transistor so that the current flowing through the P-type MOS transistor becomes a constant value.
10 Citations
20 Claims
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1. A constant-voltage power circuit comprising:
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a control voltage output circuit receiving a reference voltage and a divided voltage dividing an output voltage, and outputting a control voltage in accordance with the difference between the reference voltage and the divided voltage; an output circuit receiving the control voltage to generate a stabilized output voltage from a high-potential-side power supply voltage; a first P-type MOS transistor carrying a current from a node of the output voltage; a capacitor connected between the node of the output voltage and a supply node of low-potential-side power supply voltage; and a P-type MOS transistor current control circuit controlling a gate of the first P-type MOS transistor so that a current flowing through the first P-type MOS transistor becomes a constant value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A constant-voltage power circuit comprising:
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a control voltage output circuit receiving a reference voltage and a divided voltage dividing an output voltage, and outputting a control voltage in accordance with the difference between the reference voltage and the divided voltage; an output circuit receiving the control voltage to generate a stabilized output voltage from a high-potential-side power supply voltage; a first N-type MOS transistor carrying a current into a node of the output voltage; a capacitor connected between the node of the output voltage and a supply node of low-potential-side power supply voltage; and an N-type MOS transistor current control circuit controlling a gate of the first N-type MOS transistor so that a current flowing through the first N-type MOS transistor becomes a constant value. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A constant-voltage power circuit comprising:
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a control voltage output circuit receiving a reference voltage and a divided voltage dividing an output voltage, and outputting a control voltage in accordance with the difference between the reference voltage and the divided voltage; an output circuit receiving the control voltage to generate a stabilized output voltage from a high-potential-side power supply voltage; a first P-type MOS transistor carrying a current from a node of the output voltage; a first N-type MOS transistor carrying a current into a node of the output voltage; a capacitor connected between the node of the output voltage and a supply node of low-potential-side power supply voltage; a P-type MOS transistor current control circuit controlling a gate of the first P-type MOS transistor so that a current flowing through the first P-type MOS transistor becomes a constant value; and an N-type MOS transistor current control circuit controlling a gate of the first N-type MOS transistor so that a current flowing through the first N-type MOS transistor becomes a constant value. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification