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US 7,443,149 B2Granted
Regulator circuit capable of detecting variations in voltage
AssigneeRohm Co., Ltc.
InventorsKazuhiko Nishimura, Hiroki Inoue, Nobuhiro Nishikawa
Life of this patent
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Abstract
A regulator circuit is provided which suppresses a variation in output voltage upon occurrence of a variation in input voltage or output current without any increase in steady-state power consumption.
Claims17
A linear regulator circuit comprising:
- an output transistor provided between an input terminal and an output terminal;
- an error amplifier which adjusts a voltage at a control terminal of the output transistor so that an output voltage appearing at the output terminal approaches a desired voltage;
- a detection circuit which detects a variation in voltage at a terminal which should have a stable potential to stabilize the output voltage, the terminal being the input terminal or the output terminal;
- and
- an auxiliary circuit which forcedly changes the voltage at the control terminal of the output transistor when a variation in voltage has been detected by the detection circuit.
2 more elements
A linear regulator circuit comprising:
- an output transistor provided between an input terminal and an output terminal;
- an error amplifier which adjusts a voltage at a control terminal of the output transistor so that an output voltage appearing at the output terminal approaches a desired voltage;
- a detection circuit which detects a variation in voltage at a terminal which should have a stable potential to stabilize the output voltage, the terminal being the input terminal or the output terminal;
- and
- an auxiliary circuit which enhances a response speed of the error amplifier when a variation in voltage has been detected by the detection circuit.
2 more elements
A linear regulator circuit comprising:
- an output transistor provided between an input terminal and an output terminal;
- an error amplifier which adjusts a voltage at a control terminal of the output transistor so that an output voltage appearing at the output terminal approaches a desired voltage;
- and
- a detecting feedback capacitor which is connected between a terminal which should have a stable potential to stabilize the output voltage, the terminal being the input terminal or the output terminal, and a bias current source of a differential amplifier circuit provided in an input stage of the error amplifier.
1 more element
A linear regulator circuit comprising:
- an output transistor provided between an input terminal and an output terminal;
- an error amplifier which adjusts a voltage at a control terminal of the output transistor so that an output voltage appearing at the output terminal approaches a desired voltage;
- and
- a detecting feedback capacitor which is connected between a terminal which should have a stable potential to stabilize the output voltage, the terminal being the input terminal or the output terminal, and an output terminal of a differential amplifier circuit provided in an input stage of the error amplifier.
1 more element
Dependencies are inferred from the claim text.