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JPH03158911A - Voltage regulator - Google Patents

Voltage regulator

Info

Publication number
JPH03158911A
JPH03158911A JP30001189A JP30001189A JPH03158911A JP H03158911 A JPH03158911 A JP H03158911A JP 30001189 A JP30001189 A JP 30001189A JP 30001189 A JP30001189 A JP 30001189A JP H03158911 A JPH03158911 A JP H03158911A
Authority
JP
Japan
Prior art keywords
voltage
output voltage
resistor
output
switching
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP30001189A
Other languages
Japanese (ja)
Inventor
Minoru Sudo
稔 須藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seiko Instruments Inc
Original Assignee
Seiko Instruments Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Seiko Instruments Inc filed Critical Seiko Instruments Inc
Priority to JP30001189A priority Critical patent/JPH03158911A/en
Publication of JPH03158911A publication Critical patent/JPH03158911A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To reduce the overshoot and the undershoot of an output voltage generated at the time of switching the output voltage by giving a delay to an external signal for switching the output voltage, and switching stepwise the output voltage. CONSTITUTION:The voltage regulator is provided with a reference voltage circuit 1, an error amplifier 2, an output transistor 3, and resistances R1, R2, and also, a resistance R3 is connected in series to the resistor R2, and a resistor R4 is connected in series to the resistor R3. Also, it is provided with a transistor M1 in which an output voltage switching terminal is connected to a gate, and a drain is connected to the connecting point of the resistor R2 and the resistor R3, and a transistor M2 in which a delaying circuit is connected to the output switching terminal and the output of the delaying circuit is connected to a gate, and a drain is connected to the connecting point of the resistor R3 and the resistor R4. In such a state, the delay is given to an external signal for switching an output voltage, and the output voltage is switched. In such a manner, the overshoot and the undershoot at the time of switching the output voltage are reduced.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、CMOSモノシリツク化されたボルテージ・
レギュレーターに関するものである。
[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a CMOS monosilicon voltage converter.
It concerns the regulator.

〔発明の概要〕[Summary of the invention]

本発明は、ボルテージ・レギュレーターの出力電圧を変
化させる外部信号に遅延を施し、出力電圧を段階的に変
化させることで、出力電圧を切り換えた時に発生するオ
ーバー・シュートや、アンダー・シュートの小さいボル
テージ・レギュレーターを提供するものである。
The present invention delays the external signal that changes the output voltage of a voltage regulator and changes the output voltage in stages, thereby eliminating overshoots and undershoots that occur when switching the output voltage.・It provides a regulator.

[従来の技術] 従来の出力電圧値が切り換え可能なボルテージ・レギュ
レーターの回路図を第2図に示す。基準電圧回路1と抵
抗R3とR2とR6から取り出された電圧は、誤差増幅
器2で比較され、出力トランジスタ3を制御する。つま
り、抵抗R1とR2とR,から取り出された電圧が、基
準電圧より小さければ、誤差増幅器2の出力は低くなり
、出力トランジスタ3を強くバイアスし、逆に抵抗R1
とR2とR5から取り出された電圧が、基準電圧より高
ければトランジスタ3を弱くバイアスして出力端子6に
は一定の出力電圧が得られる。
[Prior Art] FIG. 2 shows a circuit diagram of a conventional voltage regulator whose output voltage value can be switched. The voltages taken out from the reference voltage circuit 1 and resistors R3, R2, and R6 are compared by an error amplifier 2 to control an output transistor 3. In other words, if the voltage extracted from the resistors R1, R2, and R is smaller than the reference voltage, the output of the error amplifier 2 will be low, strongly biasing the output transistor 3, and conversely,
If the voltage extracted from R2 and R5 is higher than the reference voltage, the transistor 3 is biased weakly and a constant output voltage is obtained at the output terminal 6.

該出力電圧値は、外部よりビカ電圧切り換え端子5に、
ハイ・レベルあるいはロー・レベルの電圧を加えること
で、トランジスタM3がON、OFFして抵抗R5をシ
ョートするかあるいはしないかによって切り換える。
The output voltage value is input from the outside to the voltage switching terminal 5,
By applying a high level or low level voltage, the transistor M3 is turned on or off, depending on whether the resistor R5 is shorted or not.

第2図のボルテージ・レギュレーターの場合、次のよう
な問題点が生じる。
In the case of the voltage regulator shown in FIG. 2, the following problems occur.

出力端子6の出力電圧なV。Uアと呼ぶと、V ouア
は出力電圧切り換え端子5に加える電圧によって式(1
)、式(2)のようになる。
The output voltage of output terminal 6 is V. When called Ua, Voua is expressed by the equation (1) depending on the voltage applied to the output voltage switching terminal 5.
), as shown in equation (2).

VOUTl= (R1+ Ri ) / Rz XVr
Ilr =・(1)Vouyi= (R+ +Rz +
Ri ) / (R2+Rs )×Vr@t     
      ・・・(2)ここで、R+ 、R2、R5
は、それぞれ第2図の抵抗R,,R2,R,の値であり
V r @tは、基準電圧回路lの出力電圧値である。
VOUTl=(R1+Ri)/RzXVr
Ilr =・(1)Vouyi= (R+ +Rz +
Ri) / (R2+Rs)×Vr@t
...(2) Here, R+, R2, R5
are the values of the resistors R, , R2, R, respectively in FIG. 2, and V r @t is the output voltage value of the reference voltage circuit l.

また式(1)は、出力電圧切り換え端子5の電圧なハイ
・レベルにした時の■。uTであり、式(2)は、出力
電圧切り換え端子5の電圧なロー・レベルにした時のV
。Lllである。
Also, equation (1) shows ■ when the voltage at the output voltage switching terminal 5 is set to high level. uT, and formula (2) is V when the voltage of the output voltage switching terminal 5 is set to low level.
. It is Lll.

このように、トランジスタM3をON、OFFさせるこ
とにより出力電圧を切り換えることができる。
In this way, the output voltage can be switched by turning on and off the transistor M3.

しかし、上記のような方法を用いて出力電圧な切り換え
ると、誤差増幅器2の応答速度に限界があり遅延を生し
るため、出力電圧に発生するオーバー・シュートやアン
ダー・シュートが大きいという課題があった。
However, when switching the output voltage using the method described above, there is a limit to the response speed of the error amplifier 2 and a delay occurs, so there is a problem that large overshoots and undershoots occur in the output voltage. there were.

[課題を解決するための手段] 本発明は、従来の技術の課題を解決することを目的とし
、出力電圧が可変なボルテージ・レギュレーターにおい
て、出力電圧切り換え時のオーバー・シュートやアンダ
ー・シュートの小さいボルテージ・レギュレーターを提
供できた。
[Means for Solving the Problems] The present invention aims to solve the problems of the conventional technology, and provides a voltage regulator with variable output voltage that has small overshoots and undershoots when switching the output voltage. We were able to provide a voltage regulator.

具体的には、出力電圧を切り換える外部信号に遅延を施
こし、出力電圧を段階的に切り換えるようにした。
Specifically, an external signal for switching the output voltage is delayed, so that the output voltage is switched in stages.

[実施例1] 以下、図面に従って本発明の一実施例を詳細に説明する
。第1図は本発明の、出力電圧に生じるアンダー・シュ
ートを抑えたボルテージ・レギュレーターの回路図であ
る。基準電圧回路1.誤差増幅器2、出力トランジスタ
3、及び、抵抗R1,R2は第2図と同等である。−1
(4−1)Rs  + R4= Rs        
      ・・・ (3)第1図の、出力電圧を切り
換える外部端子5の信号Aと遅延回路4を通った信号B
と、出力端子6の電圧■。0アの電圧波形図を第3図に
示す。
[Example 1] Hereinafter, an example of the present invention will be described in detail with reference to the drawings. FIG. 1 is a circuit diagram of a voltage regulator according to the present invention that suppresses undershoot occurring in the output voltage. Reference voltage circuit 1. The error amplifier 2, output transistor 3, and resistors R1 and R2 are the same as in FIG. -1
(4-1) Rs + R4 = Rs
(3) Signal A of external terminal 5 that switches the output voltage and signal B that has passed through delay circuit 4 in Fig. 1
and the voltage at output terminal 6■. A voltage waveform diagram of 0A is shown in FIG.

抵抗R2と直列に抵抗R3を結線し、該R3に直列に抵
抗R4を結線する。抵抗R8とR4の値は式(3)を満
足するように決定する。さらに、出力電圧切り換え端子
をゲートに結線し、ドレインを抵抗R2とR3の接続点
に結線したトランジスタM1と、出力電圧切り換え端子
に遅延回路を結線し該遅延回路の出力をゲートに結線し
、トレインを抵抗R3とR4の接続点に結線したトラン
ジスタM2を具備している。
A resistor R3 is connected in series with the resistor R2, and a resistor R4 is connected in series with the resistor R3. The values of resistors R8 and R4 are determined to satisfy equation (3). Furthermore, the output voltage switching terminal is connected to the gate, and the drain is connected to the connection point of resistors R2 and R3, and a delay circuit is connected to the output voltage switching terminal, and the output of the delay circuit is connected to the gate. The transistor M2 is connected to the connection point between the resistors R3 and R4.

信号Aが、ハイ・レベルにある時、VOUTは式(1)
で与えられる電圧になる。信号Aが、ハイ・レベルから
ロー・レベルに切り換えるとV OUTは、時間ΔTの
間、式(4)で与えられる電圧になる。
When signal A is at high level, VOUT is expressed by formula (1)
The voltage will be given by . When signal A switches from high level to low level, V OUT becomes the voltage given by equation (4) for a time ΔT.

VOUT = (R1+Rg +Rs ) / (R2
+Ra )×■rllf           ・・・
(4)この時、アンダー・シュート△■1が生じるが、
このアンダー・シュートによってV。UTが式(2)で
与えられる■。UT2と同程度か、それよりも大きくな
るように抵抗R3の値を決定する。
VOUT = (R1+Rg +Rs) / (R2
+Ra)×■rllf...
(4) At this time, undershoot △■1 occurs, but
V due to this undershoot. ■ UT is given by equation (2). The value of resistor R3 is determined so that it is equal to or larger than UT2.

信号Aが、遅延回路4を通って時間△T後に信号Bがハ
イ・レベルからロー・レベルに切り換わると、V ou
tは式(2)で与えられる電圧になる(式(3)より)
When signal A passes through delay circuit 4 and signal B switches from high level to low level after time ΔT, V ou
t is the voltage given by equation (2) (from equation (3))
.

この時、アンダー・シュート△V2は第2図の従来のボ
ルテージ・レギュレーターのアンダー・シュートの半分
以下にである。
At this time, the undershoot ΔV2 is less than half of the undershoot of the conventional voltage regulator shown in FIG.

〔実施例21 第4図にオーバー・シュートを抑えたボルテージ・レギ
ュレーターの回路図を示す。基準電圧回路l、誤差増幅
器2、出力トランジスタ3、遅延回路4、及び、抵抗R
1,R2は第1図と同等である。−(6−1) Ra +R? =Rs          ・・・(5
)第4図の、出力電圧を切り換える外部端子5の信号A
と遅延回路を通った信号Bと、出力端子6の電圧■。U
アの電圧波形図を第5図に示す。
[Embodiment 21] Figure 4 shows a circuit diagram of a voltage regulator that suppresses overshoot. Reference voltage circuit l, error amplifier 2, output transistor 3, delay circuit 4, and resistor R
1 and R2 are the same as in FIG. -(6-1) Ra +R? =Rs...(5
) Signal A of external terminal 5 that switches the output voltage in Fig. 4
and signal B passing through the delay circuit, and the voltage at output terminal 6 ■. U
Figure 5 shows the voltage waveform diagram of (a).

信号Aが、ロー・レベルにある時、VQUTは式(2)
で与えられる電圧になる(式(5)より)。信号Aが、
ロー・レベルからハイ・レベルに切り換わると■。Ul
は、時間△Tの間、式(6)で与えられる電圧になる。
When signal A is at low level, VQUT is expressed as formula (2)
The voltage is given by (from equation (5)). Signal A is
■ When switching from low level to high level. Ul
becomes the voltage given by equation (6) during time ΔT.

VOIIT = (R+ +Rx +Rs ) / (
R2+ Re )XVrer            
・・・(6)この時、オーバー・シュート△■3が生じ
るか、このオーバー・シュートによってV。UTが式(
1)で与えられるV。LITIと同程度か、それよりも
小さくなるように抵抗R6の値を決定する。
VOIIT = (R+ +Rx +Rs) / (
R2+Re)XVrer
...(6) At this time, either overshoot △■3 occurs or V due to this overshoot. UT is the formula (
V given by 1). The value of the resistor R6 is determined so that it is equal to or smaller than LITI.

信号Aが遅延回路4を通って時間へT後に、信号Bがロ
ー・レベルからハイ・レベルに切り換わるとV。UTは
式(1)で与えられる電圧になる。
When signal A passes through the delay circuit 4 for a time T, signal B switches from low level to high level V. UT becomes the voltage given by equation (1).

この時オーバー・シュート△v4は、第2図の従来のボ
ルテージ・レギュレーターのオーバー・シュートの半分
以下である。
At this time, the overshoot Δv4 is less than half of the overshoot of the conventional voltage regulator shown in FIG.

抵抗R2と直列に抵抗R6を結線し、該R6に直列に抵
抗R7を結線する。抵抗R6とR2の値は式(5)を満
足するように決定する。さらに出力電圧切り換え端子を
ゲートに結線し、ドレインを抵抗R6とR2の接続点に
結線したトランジスタM4と、出力電圧切り換え端子に
遅延回路を結線し該遅延回路の出力をゲートに結線し、
トレインを抵抗R2とR6の接続点に結線したトランジ
スタM5を具備している。
A resistor R6 is connected in series with the resistor R2, and a resistor R7 is connected in series with the resistor R6. The values of resistors R6 and R2 are determined to satisfy equation (5). Further, the output voltage switching terminal is connected to the gate, the drain is connected to the connection point of resistors R6 and R2, and a delay circuit is connected to the output voltage switching terminal, and the output of the delay circuit is connected to the gate,
It includes a transistor M5 whose train is connected to the connection point of resistors R2 and R6.

〔発明の効果] 以上述べたように本発明によれば、出力電圧を切り換え
る外部信号に遅延を施し、出力電圧を段階的に切り換え
ることで、出力電圧切り換え時に発生する出力電圧のオ
ーバーシュートやアンダー・シュートの小さいボルテー
ジ・レギュレーターを提供できるという効果がある。
[Effects of the Invention] As described above, according to the present invention, by delaying the external signal for switching the output voltage and switching the output voltage in stages, overshoot and undershoot of the output voltage that occur when switching the output voltage can be prevented.・It has the effect of providing a voltage regulator with a small shoot.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明のアンダー・シュートを抑えたボルテー
ジ・レギュレーターの回路図、第2図は従来のボルテー
ジ・レギュレーターの回路図、第3図は第1図の各部の
電圧波形図、第4図は本発明のオーバー・シュートを抑
えたボルテージ・レギュレーターの回路図、第5図は第
4図の各部の電圧波形図である。 基準電圧回路 誤差増幅器 出力トランジスタ 遅延回路 出力電圧切り換え端子 出力端子 以上
Figure 1 is a circuit diagram of a voltage regulator that suppresses undershoot according to the present invention, Figure 2 is a circuit diagram of a conventional voltage regulator, Figure 3 is a voltage waveform diagram of each part of Figure 1, and Figure 4. 5 is a circuit diagram of a voltage regulator that suppresses overshoot according to the present invention, and FIG. 5 is a voltage waveform diagram of each part of FIG. 4. Reference voltage circuit error amplifier output transistor delay circuit output voltage switching terminal output terminal or higher

Claims (1)

【特許請求の範囲】[Claims] 基準電圧回路と、抵抗と誤差増幅器と、出力トランジス
タとからなり、外部信号によって出力電圧が可変な、C
MOSモノリシックIC化されたボルテージ・レギュレ
ーターにおいて、前記出力電圧を変化させる外部信号に
遅延を施し、段階的に出力電圧を変える手段を具備する
ことを特徴としたボルテージ・レギュレーター。
A C type circuit that consists of a reference voltage circuit, a resistor, an error amplifier, and an output transistor, and whose output voltage is variable according to an external signal.
1. A voltage regulator configured as a MOS monolithic IC, characterized in that the voltage regulator is provided with means for delaying an external signal for changing the output voltage to change the output voltage stepwise.
JP30001189A 1989-11-17 1989-11-17 Voltage regulator Pending JPH03158911A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP30001189A JPH03158911A (en) 1989-11-17 1989-11-17 Voltage regulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP30001189A JPH03158911A (en) 1989-11-17 1989-11-17 Voltage regulator

Publications (1)

Publication Number Publication Date
JPH03158911A true JPH03158911A (en) 1991-07-08

Family

ID=17879645

Family Applications (1)

Application Number Title Priority Date Filing Date
JP30001189A Pending JPH03158911A (en) 1989-11-17 1989-11-17 Voltage regulator

Country Status (1)

Country Link
JP (1) JPH03158911A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7049880B2 (en) 2003-10-07 2006-05-23 Atmel Corporation High precision digital-to-analog converter with optimized power consumption
US7049879B2 (en) 2002-07-12 2006-05-23 Denso Corporation Power supply circuit with control of rise characteristics of output voltage
JP2009003886A (en) * 2007-06-25 2009-01-08 Samsung Electronics Co Ltd Voltage regulator circuit
US7512821B2 (en) 2002-10-02 2009-03-31 Ricoh Company, Ltd. Power supply system and method for supplying power to CPU providing power saving mode
CN102147629A (en) * 2010-02-04 2011-08-10 立积电子股份有限公司 Voltage regulator capable of randomly modulating output voltage and related voltage regulating method
US8289008B2 (en) 2009-12-24 2012-10-16 Richwave Technology Corp. Voltage regulator which provides sequentially and arbitrarrily shaped regulated voltage and related method
JP2013165350A (en) * 2012-02-09 2013-08-22 Lapis Semiconductor Co Ltd Amplifier
JP2017050902A (en) * 2015-08-31 2017-03-09 三菱電機エンジニアリング株式会社 Voltage output circuit

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7049879B2 (en) 2002-07-12 2006-05-23 Denso Corporation Power supply circuit with control of rise characteristics of output voltage
US7512821B2 (en) 2002-10-02 2009-03-31 Ricoh Company, Ltd. Power supply system and method for supplying power to CPU providing power saving mode
US7049880B2 (en) 2003-10-07 2006-05-23 Atmel Corporation High precision digital-to-analog converter with optimized power consumption
JP2009003886A (en) * 2007-06-25 2009-01-08 Samsung Electronics Co Ltd Voltage regulator circuit
KR101411977B1 (en) * 2007-06-25 2014-06-26 삼성전자주식회사 A voltage regulator, including a flash memory device and a memory system including it
US8289008B2 (en) 2009-12-24 2012-10-16 Richwave Technology Corp. Voltage regulator which provides sequentially and arbitrarrily shaped regulated voltage and related method
CN102147629A (en) * 2010-02-04 2011-08-10 立积电子股份有限公司 Voltage regulator capable of randomly modulating output voltage and related voltage regulating method
JP2013165350A (en) * 2012-02-09 2013-08-22 Lapis Semiconductor Co Ltd Amplifier
JP2017050902A (en) * 2015-08-31 2017-03-09 三菱電機エンジニアリング株式会社 Voltage output circuit

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