Regulator

Patent metadata

Field	Value
Publication number	US-9740223-B1
Application number	US-201615201614-A
Country	US
Kind code	B1
Filing date	Jul 4, 2016
Priority date	Mar 31, 2016
Publication date	Aug 22, 2017
Grant date	Aug 22, 2017

Abstract

A regulator includes a driver circuit, an amplifier circuit, a first current source circuit and a second current source circuit. The driver circuit is configured to receive an input voltage and provide an output voltage. The first current source circuit is configured to provide a first current to the amplifier circuit. The second current source circuit is configured to provide a second current to the amplifier circuit according to the output voltage if the output voltage deviates from a predetermined voltage. The amplifier circuit is configured to control the driver circuit according to the output voltage and a third current, in which the third current is a sum of the first current and the second current.

First claim

What is claimed is:

1. A regulator, comprising:
a driver circuit, configured to receive an input voltage and provide an output voltage;
an amplifier circuit;
a first current source circuit, configured to provide a first current to the amplifier circuit; and
a second current source circuit, configured to provide a second current to the amplifier circuit according to the output voltage if the output voltage deviates from a predetermined voltage;
wherein the amplifier circuit is configured to control the driver circuit according to the output voltage and a third current, the third current is a sum of the first current and the second current, and the second current source circuit is further configured to provide the second current according to a first voltage difference between the output voltage and a reference voltage, and the reference voltage is the predetermined voltage;
wherein if the first voltage difference is getting larger, the second current source circuit increases the second current so that the amplifier circuit increases a speed of controlling the driver circuit to reduce the output voltage.

2. The regulator of claim 1 , wherein if the output voltage is getting larger than the reference voltage, the second current source circuit increases the second current that the amplifier circuit increases the speed of controlling the driver circuit to reduce the output voltage.

3. The regulator of claim 1 , wherein if the output voltage is getting smaller than the reference voltage, the second current source circuit increases the second current so that the amplifier circuit increases the speed of controlling the driver circuit to increase the output voltage.

4. The regulator of claim 1 , wherein the second current source circuit comprises:
a differential amplifier circuit, configured to amplify the first voltage difference to provide the second current.

5. The regulator of claim 1 , wherein the amplifier circuit is configured to amplify a second voltage difference between a feedback voltage and the reference voltage to control the driver circuit, and the feedback voltage corresponds to the output voltage.

6. A regulator, comprising:
a driver circuit, configured to receive an input voltage and provide an output voltage;
an amplifier circuit;
a first current source circuit configured to provide a first current to the amplifier circuit; and
a second current source circuit, configured to provide a second current to the amplifier circuit according to the output voltage if the output voltage deviates from a predetermined voltage;
wherein the amplifier circuit is configured to control the driver circuit according to the output voltage and a third current, the third current is a sum of the first current and the second current, and the second current source circuit is further configured to provide the second current according to a voltage difference between a feedback voltage and a reference voltage, the feedback voltage corresponds to the output voltage, and the reference voltage corresponds to the predetermined voltage,
wherein if the voltage difference is getting larger, the second current source circuit increases the second current so that the am amplifier circuit increases a speed of controlling the driver circuit to reduce the output voltage.

7. The regulator of claim 6 , wherein if the feedback voltage is getting larger than the reference voltage, the second current source circuit increases the second current so that the amplifier circuit increases the speed of controlling the driver circuit to reduce the output voltage.

8. The regulator of claim 6 , wherein if the feedback voltage is getting smaller than the reference voltage, the second current source circuit increases the second current so that the amplifier circuit increases the speed of controlling the driver circuit to increase the output voltage.

9. The regulator of claim 6 , wherein the second current source circuit comprises:
a differential amplifier circuit, configured to amplify the voltage difference to provide the second current.

10. The regulator of claim 6 , wherein the amplifier circuit is configured to amplify the voltage difference between the feedback voltage and the reference voltage to control the driver circuit, and the feedback voltage corresponds to the output voltage.

11. A regulator, comprising:
a driver circuit, comprising an input terminal, an output terminal and a control terminal, wherein the input terminal is configured to receive an input voltage, and the output terminal is configured to provide an output voltage;
an amplifier circuit, comprising a first input terminal and an output terminal, wherein the output terminal is coupled to the control terminal of the driver circuit;
a first current source circuit, coupled to the first input terminal of the amplifier circuit and configured to provide a first current to the amplifier circuit; and
a second current source circuit, coupled to the first input terminal of the amplifier circuit and configured to provide a second current to the amplifier circuit according to the output voltage if the output voltage deviates from a predetermined voltage;
wherein the amplifier circuit is configured to control the driver circuit according to the output voltage and a third current, the third current is a sum of the first current and the second current, and the second current source circuit is further configured to provide the second current according to a voltage difference between a feedback voltage and a reference voltage, the feedback voltage corresponds to the output voltage, and the reference voltage corresponds to the predetermined voltage,
wherein if the voltage difference is getting larger, the second current source circuit increases the second current so that the amplifier circuit increases a speed of controlling the driver circuit to reduce the output voltage.

12. The regulator of claim 11 , wherein the feedback voltage is the output voltage.

13. The regulator of claim 11 , wherein if the feedback voltage is getting larger than the reference voltage, the second current source circuit increases the second current so that the amplifier circuit increases the speed of controlling the driver circuit to reduce the output voltage.

14. The regulator of claim 11 , wherein if the feedback voltage is getting smaller than the reference voltage, the second current source circuit increases the second current so that the amplifier circuit increases the speed of controlling the driver circuit to increase the output voltage.

15. The regulator of 11 , wherein the second current source circuit comprises:
a differential amplifier circuit, comprising a first input terminal a second input, terminal and an output terminal, wherein the first input terminal is configured to receive the reference voltage, the second input terminal is configured to receive the feedback voltage, and the differential amplifier circuit is configured to amplify the voltage difference to provide the second current through the output terminal.

16. The regulator of claim 11 , wherein the amplifier circuit further comprises a second input terminal and a third input terminal, the second input terminal configured to receive the reference voltage, the third input terminal is configured to receive the feedback voltage, the amplifier circuit is configured to amplify the voltage difference between the feedback voltage and the reference voltage to control the driver circuit, and the feedback voltage corresponds to the output voltage.

Assignees

• Realtek Semiconductor Corp

Inventors

• Wang Shih-Wei
• Chang Chih-Chien
• Yang Hsiang-An

Classifications

• G05F1/56 Primary

  using semiconductor devices in series with the load as final control devices (G05F1/461 takes precedence) · CPC title

• G05F1/575

  characterised by the feedback circuit · CPC title