TWI448868B - Voltage regulator - Google Patents
Voltage regulator Download PDFInfo
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Description
本發明係，有關輸出一定的輸出電壓之電壓調整器，更詳細為，有關讓電壓調整器的動作安定的相位補償電路。The present invention relates to a voltage regulator for outputting a constant output voltage, and more particularly to a phase compensation circuit for ensuring the operation of a voltage regulator.
圖3係，表示固有的電壓調整器的電路圖。Fig. 3 is a circuit diagram showing an inherent voltage regulator.
固有的電壓調整器係具備有，輸出輸出電壓Vout的輸出電晶體21、分壓輸出電壓Vout的分壓電路22、發生基準電壓的基準電壓電路23、以分壓電路22的輸出電壓以及基準電壓電路為基礎，控制輸出電晶體21讓輸出電壓Vout一定的誤差放大電路24、以及設於輸出電晶體21和誤差放大電路24之間，補償相位補償電路20的輸出端子20d的相位的相位補償電路20。相位補償電路20係有，相位補償電容20a以及相位補償電阻20b(例如參照專利文獻1)。The intrinsic voltage regulator includes an output transistor 21 that outputs an output voltage Vout, a voltage dividing circuit 22 that divides the voltage output voltage Vout, a reference voltage circuit 23 that generates a reference voltage, and an output voltage of the voltage dividing circuit 22, and Based on the reference voltage circuit, the output amplifier 21 controls the error amplifying circuit 24 having a constant output voltage Vout, and is disposed between the output transistor 21 and the error amplifying circuit 24 to compensate the phase of the phase of the output terminal 20d of the phase compensating circuit 20. Compensation circuit 20. The phase compensation circuit 20 includes a phase compensation capacitor 20a and a phase compensation resistor 20b (see, for example, Patent Document 1).
[專利文獻1]日本2005-251897號公報[Patent Document 1] Japanese Patent Publication No. 2005-251897
關於電壓調整器的相位補償電路20，為了讓電壓調整器能安定的動作，相位補償電阻20b的電阻值有設定的比較大的場合。The phase compensation circuit 20 of the voltage regulator has a relatively large resistance value of the phase compensation resistor 20b in order to stabilize the voltage regulator.
當電壓調整器的輸出電壓Vout發生變化，誤差放大電路24的輸出電壓也會變化。在誤差放大電路24的輸出電壓於變化的過渡狀態，相位補償電阻20b的電阻值較大的話，輸出電晶體21的閘極的充放電會較花時間。When the output voltage Vout of the voltage regulator changes, the output voltage of the error amplifying circuit 24 also changes. When the output voltage of the error amplifying circuit 24 is in a varying transition state and the resistance value of the phase compensating resistor 20b is large, charging and discharging of the gate of the output transistor 21 takes a long time.
圖4係，表示固有的電壓調整器的相位補償電路之輸入電壓以及輸出電壓的圖。Fig. 4 is a view showing an input voltage and an output voltage of a phase compensating circuit of a unique voltage regulator.
在相位補償電路20的輸入電壓V1發生如圖4的(A)所示的變化後，相位補償電路20的輸出電壓V2會發生如圖4的(B)所示的變化。相位補償電阻20b的電阻值較小的場合的輸出電壓V2，會發生如圖4的(B)的點線所示的變化，相位補償電阻20b的電阻值較大的場合，會發生如圖4的(B)的實線所示的變化。When the input voltage V1 of the phase compensation circuit 20 changes as shown in (A) of FIG. 4, the output voltage V2 of the phase compensation circuit 20 changes as shown in (B) of FIG. When the resistance value of the phase compensation resistor 20b is small, the output voltage V2 changes as shown by the dotted line in FIG. 4(B), and when the resistance value of the phase compensation resistor 20b is large, FIG. 4 occurs. The change shown by the solid line of (B).
即是有，相位補償電路20的過渡反應特性變差，跟著相位補償電路的過渡反應特性也變差的問題。That is, there is a problem that the transient response characteristics of the phase compensation circuit 20 are deteriorated, and the transient reaction characteristics of the phase compensation circuit are also deteriorated.
本發明係，有鑑於這樣的問題，提供即使相位補償電阻的電阻值較大，過渡反應特性仍然良好的電壓調整器。The present invention has been made in view of such a problem, and provides a voltage regulator in which the transient response characteristics are good even if the resistance value of the phase compensation resistor is large.
本發明的電壓調整器係，為解決前述的問題，相位補償電路的電阻以，能對應電阻兩端的電壓來變化電阻值的電阻來構成。這樣，在誤差放大電路的輸出電壓於變化的過渡狀態，由於相位補償電阻的電阻值變小，不用犧牲相位補償電路的性能，就能改善電壓調整器的過渡反應特性。In order to solve the above-described problems, the voltage regulator of the present invention is configured such that the resistance of the phase compensation circuit is a resistor that can change the resistance value in accordance with the voltage across the resistor. Thus, in the transient state in which the output voltage of the error amplifying circuit is changed, since the resistance value of the phase compensating resistor becomes small, the transient response characteristic of the voltage regulator can be improved without sacrificing the performance of the phase compensating circuit.
本發明的電壓調整器係為，在誤差放大電路的輸出電壓於變化的過渡狀態，由於相位補償電路的電阻的電阻值變小，相位補償電路的反應特性會變好的構成。所以，能夠設定較大的相位補償電路的電阻的電阻值，而且有使電壓調整器的過渡反應特性較好的效果。In the voltage regulator of the present invention, in a transient state in which the output voltage of the error amplifying circuit is changed, the resistance of the phase compensating circuit is reduced, and the reaction characteristics of the phase compensating circuit are improved. Therefore, it is possible to set the resistance value of the resistance of the large phase compensation circuit, and it is advantageous in that the transient response characteristics of the voltage regulator are good.
圖1係，表示本發明的電壓調整器的迴路圖。Fig. 1 is a circuit diagram showing a voltage regulator of the present invention.
本發明的電壓調整器係具備有，相位補償電路10、輸出電晶體11、分壓電路12、基準電壓電路13、誤差放大電路14、電源端子15、輸出端子16以及接地端子17。相位補償電路10係具備有，相位補償電容10a、相位補償電阻10b以及10c、控制電晶體10d、輸入端子10e、輸入端子10f以及輸出端子10g。The voltage regulator of the present invention includes a phase compensation circuit 10, an output transistor 11, a voltage dividing circuit 12, a reference voltage circuit 13, an error amplifying circuit 14, a power supply terminal 15, an output terminal 16, and a ground terminal 17. The phase compensation circuit 10 includes a phase compensation capacitor 10a, phase compensation resistors 10b and 10c, a control transistor 10d, an input terminal 10e, an input terminal 10f, and an output terminal 10g.
相位補償電路10係，輸入端子10e與誤差放大電路14的輸出端子接續，輸入端子10f與電源端子15接續，輸出端子10g與輸出電晶體11的閘極接續。輸出電晶體11係，源極以及後閘極(back gate)與電源端子15接續，汲極與輸出端子16接續。分壓電路12係，設於輸出端子16和接地端子17之間，分壓電路12的輸出端子與誤差放大電路14的非反轉輸入端子接續。基準電壓電路13係，設於誤差放大電路14的反轉輸入端子和接地端子17之間。In the phase compensation circuit 10, the input terminal 10e is connected to the output terminal of the error amplifying circuit 14, the input terminal 10f is connected to the power supply terminal 15, and the output terminal 10g is connected to the gate of the output transistor 11. The output transistor 11 is connected, the source and the back gate are connected to the power supply terminal 15, and the drain is connected to the output terminal 16. The voltage dividing circuit 12 is provided between the output terminal 16 and the ground terminal 17, and the output terminal of the voltage dividing circuit 12 is connected to the non-inverting input terminal of the error amplifying circuit 14. The reference voltage circuit 13 is provided between the inverting input terminal of the error amplifying circuit 14 and the ground terminal 17.
相位補償電容10a的一端與相位補償電路10的輸入端子10e接續，其他端與相位補償電路10的輸出端子10g接續。相位補償電阻10b的一端與相位補償電路10的輸入端子10e接續，其他端與控制電晶體10d的閘極接續。相位補償電阻10c的一端與控制電晶體10d的閘極接續，其他端與相位補償電路10的輸出端子10g接續。控制電晶體10d的源極與相位補償電路10的輸入端子10e接續，汲極與相位補償電路10的輸出端子10g接續，後閘極與相位補償電路10的輸入端子10f接續。One end of the phase compensation capacitor 10a is connected to the input terminal 10e of the phase compensation circuit 10, and the other end is connected to the output terminal 10g of the phase compensation circuit 10. One end of the phase compensating resistor 10b is connected to the input terminal 10e of the phase compensating circuit 10, and the other end is connected to the gate of the control transistor 10d. One end of the phase compensating resistor 10c is connected to the gate of the control transistor 10d, and the other end is connected to the output terminal 10g of the phase compensating circuit 10. The source of the control transistor 10d is connected to the input terminal 10e of the phase compensation circuit 10, the drain is connected to the output terminal 10g of the phase compensation circuit 10, and the rear gate is connected to the input terminal 10f of the phase compensation circuit 10.
上述的電壓調整器的動作如以下所述。The operation of the voltage regulator described above is as follows.
輸出電晶體11係，輸出輸出電壓Vout。分壓電路12係，分壓輸出電壓Vout。基準電壓電路13係，發生基準電壓。誤差放大電路14係，以分壓電路12的輸出電壓以及基準電壓為基準，輸出控制輸出電晶體11的控制信號讓輸出電壓Vout維持一定。The output transistor 11 is an output voltage Vout. The voltage dividing circuit 12 is configured to divide the output voltage Vout. The reference voltage circuit 13 is configured to generate a reference voltage. The error amplifying circuit 14 outputs a control signal for controlling the output transistor 11 based on the output voltage of the voltage dividing circuit 12 and the reference voltage to maintain the output voltage Vout constant.
當輸出電壓Vout變低，分壓電路12的輸出電壓也會變低。當分壓電路12的輸出電壓比基準電壓低的時候，誤差放大電路14的輸出電壓以及相位補償電路10的輸入電壓V1會變低。由介著相位補償電路10的控制信號，控制輸出電晶體11的閘極電壓降低升高。又，當輸出電壓Vout變高時，輸出電晶體11的閘極電壓升高，控制讓輸出電壓Vout變低。循此，輸出電壓Vout能控制在一定When the output voltage Vout becomes lower, the output voltage of the voltage dividing circuit 12 also becomes lower. When the output voltage of the voltage dividing circuit 12 is lower than the reference voltage, the output voltage of the error amplifying circuit 14 and the input voltage V1 of the phase compensating circuit 10 become low. The gate voltage of the output transistor 11 is controlled to decrease by the control signal passing through the phase compensation circuit 10. Further, when the output voltage Vout becomes high, the gate voltage of the output transistor 11 rises, and the control causes the output voltage Vout to become low. According to this, the output voltage Vout can be controlled at a certain
再來，說明本發明的電壓調整器的相位補償電路10的動作。相位補償電路10係，補償誤差放大電路14所輸出的控制信號的相位。特別是，相位補償電容10a的電容值以及相位補償電阻10b以及10c的電阻值係，設定成不會造成電壓調整器振盪。Next, the operation of the phase compensation circuit 10 of the voltage regulator of the present invention will be described. The phase compensation circuit 10 compensates the phase of the control signal output from the error amplifying circuit 14. In particular, the capacitance value of the phase compensation capacitor 10a and the resistance values of the phase compensation resistors 10b and 10c are set so as not to cause the voltage regulator to oscillate.
首先，說明當的過渡狀態。First, explain the transition state.
輸出電壓Vout的電壓低下為小的場合，相位補償電路10的輸入電壓V1與輸出電壓V2的電壓差變小。循此，因為控制電晶體10d為OFF，相位補償電路10係，相位補償電容10a和相位補償電阻10b以及10c以並聯接續來構成。When the voltage drop of the output voltage Vout is small, the voltage difference between the input voltage V1 and the output voltage V2 of the phase compensation circuit 10 becomes small. Accordingly, since the control transistor 10d is OFF, the phase compensation circuit 10 is configured such that the phase compensation capacitor 10a and the phase compensation resistors 10b and 10c are connected in parallel.
再來，說明當輸出電壓Vout的電壓變化大時的過渡狀態。Next, a transition state when the voltage of the output voltage Vout changes greatly is explained.
輸出電壓Vout的電壓低下為大的場合，相位補償電路10的輸入電壓V1會大幅降低。這時，如果相位補償電路10的電阻值高的話，輸入電壓V1與輸出電壓V2的電壓差會變大。此電壓差由相位補償電阻10b以及10c分壓後外施於控制電晶體10d的閘極，控制電晶體10d為ON。循此，相位補償電路10係，相位補償電容10a和相位補償電阻10b以及10c和控制電晶體10d以並聯接續來構成。在此狀態，因為控制電晶體10d為ON，相位補償電路10的輸入端子10e和輸出端子1g間的電阻之電阻值變小。也就是，相位補償電路10的過渡反應特性變好。又，當輸出電壓Vout的電壓上昇為大的場合，和上述同樣的，因為控制電晶體10d為ON，相位補償電路10的過渡反應特性變好。When the voltage of the output voltage Vout is low, the input voltage V1 of the phase compensation circuit 10 is greatly lowered. At this time, if the resistance value of the phase compensation circuit 10 is high, the voltage difference between the input voltage V1 and the output voltage V2 becomes large. This voltage difference is divided by the phase compensating resistors 10b and 10c and applied to the gate of the control transistor 10d, and the control transistor 10d is turned ON. Accordingly, the phase compensating circuit 10 is constructed such that the phase compensating capacitor 10a and the phase compensating resistors 10b and 10c and the control transistor 10d are connected in parallel. In this state, since the control transistor 10d is ON, the resistance value of the resistor between the input terminal 10e and the output terminal 1g of the phase compensation circuit 10 becomes small. That is, the transient response characteristics of the phase compensation circuit 10 become better. Further, when the voltage of the output voltage Vout rises to be large, the transient response characteristic of the phase compensation circuit 10 is improved because the control transistor 10d is turned on in the same manner as described above.
圖2係，表示本發明的電壓調整器的相位補償電路之輸入電壓以及輸出電壓的圖。Fig. 2 is a view showing an input voltage and an output voltage of a phase compensation circuit of the voltage regulator of the present invention.
根據本發明的相位補償電路，相位補償電路10的輸入電壓V1發生如圖2的(A)所示的變化後，因為相位補償電路10，與圖4的(B)比較下相位補償電路10的輸出電壓V2會發生如圖2的(B)所示的高速變化。According to the phase compensation circuit of the present invention, after the input voltage V1 of the phase compensation circuit 10 changes as shown in (A) of FIG. 2, the phase compensation circuit 10 compares the phase compensation circuit 10 with the phase compensation circuit 10 of FIG. The output voltage V2 changes at a high speed as shown in (B) of FIG. 2 .
在此，相位補償電路10的輸入電壓以V1、輸出電壓以V2、控制電晶體10d的閥值以Vthp來代表，相位補償電阻10b與10c的電阻值相等的場合，控制電晶體10d為ON的條件以式1來授與。Here, the input voltage of the phase compensation circuit 10 is represented by Vth, the output voltage is V2, and the threshold of the control transistor 10d is represented by Vthp. When the resistance values of the phase compensation resistors 10b and 10c are equal, the control transistor 10d is turned ON. The conditions are given in Equation 1.
｜V1-V2｜/2＞｜Vthp｜‧‧‧(1)|V1-V2|/2>|Vthp|‧‧‧(1)
相位補償電阻10b與10c的電阻值相等的場合下，在輸出電壓Vout變低和變高時，控制電晶體10d也在相同的時間ON。即是，在輸出電壓Vout變化的過渡狀態時，對於輸出電壓Vout變低和變高的場合，控制電晶體11的過渡反應特性為相同。When the resistance values of the phase compensating resistors 10b and 10c are equal, the control transistor 10d is turned ON at the same time when the output voltage Vout becomes lower and higher. That is, when the output voltage Vout is low and high in the transient state in which the output voltage Vout changes, the transient reaction characteristics of the control transistor 11 are the same.
又，在相位補償電阻10b與相位補償電阻10c的電阻值不同的場合的控制電晶體10d為ON的條件係，位補償電阻10b的電阻值以R1、相位補償電阻10c的電阻值以R2表示，輸出電壓Vout變低的場合以式2，輸出電壓Vout變高的場合以式3來授與。Further, when the control transistor 10d is turned on when the resistance values of the phase compensating resistor 10b and the phase compensating resistor 10c are different, the resistance value of the bit compensating resistor 10b is represented by R2, and the resistance value of the phase compensating resistor 10c is represented by R2. When the output voltage Vout becomes low, in the case of Equation 2, when the output voltage Vout becomes high, it is given by Equation 3.
(V2-V1)×R1/(R1＋R2)＞｜Vthp｜‧‧‧(2)(V2-V1)×R1/(R1+R2)>|Vthp|‧‧‧(2)
(V1-V2)×R2/(R1＋R2)＞｜Vthp｜‧‧‧(3)(V1-V2)×R2/(R1+R2)>|Vthp|‧‧‧(3)
如以上，即使因為相位補償電阻10b與相位補償電阻10c的電阻值的不同，在輸出電壓Vout變高的場合讓過渡反應特性變好或是變低的場合讓過渡反應特性變好，是可以調整的。As described above, even if the resistance of the phase compensating resistor 10b and the phase compensating resistor 10c is different, the transition reaction characteristic becomes good when the output voltage Vout becomes high, and the transition reaction characteristic is improved, and the adjustment can be adjusted. of.
尚且，控制電晶體10d的後閘極係，雖然與電源端子15接續，與比電源端子15以外的源極以及汲極的電壓更高電壓的點相接續也可。Further, the rear gate of the control transistor 10d may be connected to the power supply terminal 15 and may be connected to a point higher than the voltage of the source and the drain other than the power supply terminal 15.
又，控制電晶體10d雖然為PMOS電晶體，NMOS電晶體也可以。這時，控制電晶體10d的後閘極係，與比電源端子15以外的源極以及汲極的電壓更低電壓的點相接續。Further, although the control transistor 10d is a PMOS transistor, an NMOS transistor may be used. At this time, the rear gate of the control transistor 10d is connected to a point lower than the voltage of the source and the drain other than the power supply terminal 15.
10．．．相位補償電路10. . . Phase compensation circuit
11．．．輸出電晶體11. . . Output transistor
12．．．分壓電路12. . . Voltage dividing circuit
13．．．基準電壓電路13. . . Reference voltage circuit
14．．．誤差放大電路14. . . Error amplifier circuit
15．．．電源端子15. . . Power terminal
16．．．輸出端子16. . . Output terminal
17．．．接地端子17. . . Ground terminal
10a．．．相位補償電容10a. . . Phase compensation capacitor
10b及10c．．．相位補償電阻10b and 10c. . . Phase compensation resistor
10d．．．控制電晶體10d. . . Control transistor
10e~10f．．．輸入端子10e~10f. . . Input terminal
10g．．．輸出端子10g. . . Output terminal
[圖1]表示本發明的電壓調整器之電路圖。Fig. 1 is a circuit diagram showing a voltage regulator of the present invention.
[圖2]表示本發明的電壓調整器的相位補償電路之輸入電壓以及輸出電壓的圖。Fig. 2 is a view showing an input voltage and an output voltage of a phase compensation circuit of the voltage regulator of the present invention.
[圖3]表示固有的電壓調整器之電路圖。FIG. 3 is a circuit diagram showing a unique voltage regulator.
[圖4]表示固有的電壓調整器的相位補償電路之輸入電壓以及輸出電壓的圖。Fig. 4 is a view showing an input voltage and an output voltage of a phase compensation circuit of a unique voltage regulator.
10．．．相位補償電路10. . . Phase compensation circuit
10a．．．相位補償電容10a. . . Phase compensation capacitor
10b．．．相位補償電阻10b. . . Phase compensation resistor
10c．．．相位補償電阻10c. . . Phase compensation resistor
10d．．．控制電晶體10d. . . Control transistor
10e．．．輸入端子10e. . . Input terminal
10f．．．輸入端子10f. . . Input terminal
10g．．．輸出端子10g. . . Output terminal
11．．．輸出電晶體11. . . Output transistor
12．．．分壓電路12. . . Voltage dividing circuit
13．．．基準電壓電路13. . . Reference voltage circuit
14．．．誤差增幅電路14. . . Error amplifying circuit
15．．．電源端子15. . . Power terminal
16．．．輸出端子16. . . Output terminal
17．．．接地端子17. . . Ground terminal
Claims (5)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007291684 | 2007-11-09 | ||
| JP2008259956A JP2009134698A (en) | 2007-11-09 | 2008-10-06 | Voltage regulator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| TW200937160A TW200937160A (en) | 2009-09-01 |
| TWI448868B true TWI448868B (en) | 2014-08-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| TW097142668A TWI448868B (en) | 2007-11-09 | 2008-11-05 | Voltage regulator |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2009134698A (en) |
| CN (1) | CN101430572B (en) |
| TW (1) | TWI448868B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9411348B2 (en) * | 2010-04-13 | 2016-08-09 | Semiconductor Components Industries, Llc | Programmable low-dropout regulator and methods therefor |
| CN102681577B (en) * | 2011-03-15 | 2014-06-11 | 瑞昱半导体股份有限公司 | Voltage adjusting device with switching and linear voltage adjusting mode |
| CN103123513B (en) * | 2011-11-18 | 2014-11-05 | 博通集成电路（上海）有限公司 | Voltage regulator and electronic device |
| CN103677045B (en) * | 2013-11-28 | 2015-04-15 | 成都位时通科技有限公司 | Voltage regulation circuit |
| US9397682B2 (en) * | 2014-04-25 | 2016-07-19 | Analog Devices, Inc. | Reference buffer with wide trim range |
| JP6884472B2 (en) * | 2017-08-10 | 2021-06-09 | エイブリック株式会社 | Voltage regulator |
| CN112286275B (en) * | 2020-09-16 | 2022-09-20 | 中国电力科学研究院有限公司 | Compensation method and device of active capacitive voltage divider |
| CN114840050A (en) * | 2022-03-16 | 2022-08-02 | 上海华虹宏力半导体制造有限公司 | Loop circuit compensation circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7068018B2 (en) * | 2004-01-28 | 2006-06-27 | Seiko Instruments Inc. | Voltage regulator with phase compensation |
| TW200809454A (en) * | 2006-08-01 | 2008-02-16 | Novatek Microelectronics Corp | Voltage regulator |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3964148B2 (en) * | 2001-04-03 | 2007-08-22 | 株式会社リコー | Voltage regulator |
| JP2004062374A (en) * | 2002-07-26 | 2004-02-26 | Seiko Instruments Inc | Voltage regulator |
-
2008
- 2008-10-06 JP JP2008259956A patent/JP2009134698A/en active Pending
- 2008-11-05 TW TW097142668A patent/TWI448868B/en not_active IP Right Cessation
- 2008-11-07 CN CN2008101741161A patent/CN101430572B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7068018B2 (en) * | 2004-01-28 | 2006-06-27 | Seiko Instruments Inc. | Voltage regulator with phase compensation |
| TW200809454A (en) * | 2006-08-01 | 2008-02-16 | Novatek Microelectronics Corp | Voltage regulator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101430572B (en) | 2012-09-05 |
| TW200937160A (en) | 2009-09-01 |
| CN101430572A (en) | 2009-05-13 |
| JP2009134698A (en) | 2009-06-18 |
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| MM4A | Annulment or lapse of patent due to non-payment of fees |