WO2010110060A1 - コンパレータおよびdc-dcコンバータ - Google Patents
コンパレータおよびdc-dcコンバータ Download PDFInfo
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- WO2010110060A1 WO2010110060A1 PCT/JP2010/053944 JP2010053944W WO2010110060A1 WO 2010110060 A1 WO2010110060 A1 WO 2010110060A1 JP 2010053944 W JP2010053944 W JP 2010053944W WO 2010110060 A1 WO2010110060 A1 WO 2010110060A1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1588—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load comprising at least one synchronous rectifier element
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Definitions
- the present invention relates to a comparator suitable for a PWM comparator constituting a current mode control type DC-DC converter and a DC-DC converter using the comparator.
- a switching regulator type DC-DC converter is available as a circuit that converts DC input voltage and outputs DC voltages of different potentials.
- a driving switching element that applies a DC voltage supplied from a DC power source such as a battery to an inductor (coil) to flow current and accumulate energy in the coil, and the driving switching element is turned off.
- a DC-DC converter provided with a rectifying element for rectifying a coil current during an energy discharge period and a control circuit for controlling on / off of the driving switching element.
- the magnitude of the output voltage is detected by an error amplifier and fed back to a PWM (pulse width modulation) comparator or PFM (pulse frequency modulation) comparator, and the output voltage is lowered.
- PWM pulse width modulation
- PFM pulse frequency modulation
- the output voltage is controlled to be constant by changing the pulse width in accordance with the ratio between the Vin voltage and the Vout voltage while keeping the drive pulse cycle (frequency) constant.
- the PWM control type DC-DC converter detects a current flowing in the driving switching element or a current flowing in the coil and feeds back a current detection signal to the voltage feedback loop to perform control.
- a DC converter As inventions relating to such a DC-DC converter, there are those described in Patent Document 1 and Patent Document 2, for example.
- FIG. 5 shows a configuration example of a DC-DC converter for current mode control investigated by the present inventors.
- the error amplifier E-AMP amplifies the potential difference between the feedback voltage VFB of the output voltage and the reference voltage Vref and supplies it to the PWM comparator CMP, while the input terminal IN and the coil driving switching transistor.
- the voltage at both terminals of the current sense resistor Rs connected to SW1 is amplified by the differential amplifier AMP and input to the PWM comparator CMP as a detection signal of the current flowing through the coil.
- the PWM comparator CMP also receives a slope compensation sawtooth wave SAW, and compares the output of the current detection differential amplifier AMP with the output voltage of the error amplifier E-AMP. . Specifically, when the voltage between the terminals of the current sense resistor Rs is Vs, the amplification factor of the current detection differential amplifier AMP is Ki, the amplitude of the sawtooth SAW is Vsaw, and the output voltage of the error amplifier E-AMP is Verr.
- the PWM comparator CMP is Ki ⁇ Vs + Vsaw ⁇ Verr (1) It is designed to output a high-level signal when is positive (> 0) and to output a low-level signal when negative ( ⁇ 0). Note that slope compensation is a technique for controlling the slope of change in the current feedback loop in order to prevent oscillation of the feedback control system, and is conventionally performed in current mode control.
- the current detection differential amplifier AMP is required to have a high slew rate as a characteristic, and to have a wide bandwidth so that the amplification factor does not decrease even when the switching frequency is increased.
- it is not easy to realize a differential amplifier having such characteristics and a circuit having a complicated configuration is required, so that the circuit scale is increased or the characteristics of transistors constituting the circuit are improved. There is a problem that costs increase due to the need to change the process.
- the present invention has been made paying attention to the above-described problems, and an object of the present invention is to provide a PWM that does not require a current detection differential amplifier that causes a cost increase in a current mode control type DC-DC converter. To provide a comparator.
- the invention according to the present application An inductor connected between a voltage input terminal to which a DC voltage is input and an output terminal to which a load is connected, a driving element for passing a current through the inductor, and controlling the driving element according to a feedback voltage of the output voltage
- a comparator provided in the voltage control loop of a DC-DC converter of a current mode control system comprising: a voltage control loop that performs feedback; and a loop that feeds back a detection signal of a current flowing through the inductor to the voltage control loop,
- the comparator includes a differential input stage having two sets of input differential transistor pairs connected in common to the sources, two constant current sources connected to a common source of the two sets of input differential transistor pairs, and the 2 A common load element connected to the drain side of the pair of input differential transistor pairs for current-voltage conversion, and an output stage connected to a coupling point between the differential input stage and the load element,
- the feedback voltage of the output voltage and the waveform signal for slope compensation are input to the input terminal of
- a cascode stage that is folded-cascode-connected to the drain terminals of the input differential transistor pair may be provided. Thereby, the input voltage range to the input differential transistor pair can be expanded.
- Another invention according to the present application is directed to an inductor connected between a voltage input terminal to which a DC voltage is input and an output terminal to which a load is connected, a drive element for passing a current through the inductor, and a series connection with the inductor.
- a current detection resistor connected so as to form a voltage, a voltage control loop having a comparator and controlling the drive element in accordance with a feedback voltage of an output voltage, and a detection signal of a current flowing through the inductor in the voltage control loop.
- the comparator includes a differential input stage having two sets of input differential transistor pairs connected in common to the sources, two constant current sources connected to a common source of the two sets of input differential transistor pairs, and the 2 A common load element connected to the drain side of the pair of input differential transistor pairs for current-voltage conversion, and an output stage connected to a coupling point between the differential input stage and the load element,
- the feedback voltage of the output voltage and the waveform signal for slope compensation are input to the input terminal of one input differential transistor pair of the two input differential transistor pairs, and the input of the other input differential transistor pair is input.
- a voltage across the current detection resistor is input to the terminal.
- the comparator may include a cascode stage that is folded cascode-connected to a drain terminal of the input differential transistor pair.
- the current detection resistor is in series with the drive element between the voltage input terminal and the inductor. Connect to make With such a configuration, current flows only through the current detection resistor during the period when the drive element is on. Therefore, the current sensing resistor is connected to the DC-DC converter connected between the inductor and the output terminal. In comparison, the time during which current flows through the resistor is shortened, and power loss can be reduced.
- the on-resistance of the drive element is used as a current detection resistor, and the voltage across the drive element is input to the comparator.
- a current detection resistor is not required, and power loss can be further reduced.
- FIG. 3 is a block diagram showing a DC-DC converter of a current mode control system examined prior to the present invention.
- FIG. 1 shows an embodiment of a comparator according to the present invention.
- the comparator of this embodiment includes a pair of input differential transistors Q1, Q2 whose sources are connected in common, and a pair of input differential transistors Q3, Q4 whose sources are also connected in common.
- the constant current transistors Q5 and Q6 are connected between the common source of each input differential transistor pair and the ground point, and the current differential is connected to the drain side of the input differential transistors Q1 to Q4.
- the transistors Q7 and Q8 are connected as a common load to the two input differential transistor pairs.
- Transistors Q5 and Q6 operate as constant current sources by applying predetermined voltages Vc1 and Vc2 to their gate terminals, respectively.
- the gate of the transistor Q8 whose gate and drain are not coupled is connected to the gate of the transistor Q11 in the output stage composed of the transistors Q11 and Q12 in series, and the drain of the transistor Q11 The terminal is connected to the output terminal OUT.
- a predetermined constant voltage supplied from a bias circuit (not shown) is applied to the gate of the other transistor Q12 in the output stage, and operates as a constant current source.
- the input differential transistors Q1 to Q4 and the constant current transistors Q5 and Q6 function as a voltage-current conversion unit for flowing currents In and Ip according to the input voltage difference
- the load transistors Q7, Q8 and the transistors Q11 and Q12 in the output stage function as a current-voltage converter.
- N-channel MOSFETs gate insulation field effect transistors
- P-channel MOSFETs are used as the transistors Q7, Q8 and Q11.
- An npn bipolar transistor may be used instead of the channel MOSFET, and a pnp bipolar transistor may be used instead of the P channel MOSFET.
- the comparator in FIG. 2 is a circuit having one input differential transistor pair Q1, Q2. This comparator has a potential difference between a pair of input voltages Vin (n) and Vin (p) as ⁇ V, a difference between currents In and Ip flowing through the transistors Q1 and Q2 as ⁇ I, and a transconductance coefficient of the differential pair Q1 and Q2 as Gm.
- the current-voltage converter outputs a high level (Vcc) if ⁇ I is positive, and outputs a low level (GND) if ⁇ I is negative.
- Vin (n1) is the output Verr
- the sawtooth wave Vsaw is input
- the voltages Vs1 and Vs2 of both terminals of the current sense resistor Rs are input as Vin (n2) and Vin (p2)
- the voltage difference (Vs1 ⁇ Vs2) generated in the current sense resistor Rs is Vs.
- the ratio Gm2 / Gm1 of the transconductance coefficients of the two differential pairs is the amplification of the current detection amplifier AMP in the DC-DC converter of FIG. It can be seen that this corresponds to the rate Ki.
- the comparator of this embodiment operates as a PWM comparator with a built-in current detection amplifier having an amplification factor of Gm2 / Gm1.
- the current mode control type DC-DC converter as shown in FIG. 5 it is not necessary to provide a current detection amplifier separately from the PWM comparator, and when a control circuit incorporating the PWM comparator is formed as a semiconductor integrated circuit, The size can be reduced. Further, in the DC-DC converter as shown in FIG. 5 provided with the current detection amplifier, it is desired that the amplifier has a high slew rate and a wide bandwidth as a characteristic of the amplifier. However, when the comparator of this embodiment is used, the current detection amplifier is Since it becomes unnecessary, an increase in cost can be avoided. Furthermore, since no current detection amplifier is required, a response to the current detection signal is possible even when the switching frequency of the drive element is increased.
- the value of Gm2 / Gm1 can be set, for example, by the current ratio of the constant current transistors Q5 and Q6 of the voltage-current conversion unit having the input differential transistor pair.
- FIG. 3 shows a modification of the comparator of the above embodiment.
- the comparator of this modification uses P-channel MOSFETs as input differential transistors Q1 to Q4, and includes transistor pairs Q21, Q22; Q31, Q32; Q41, Q42 that are folded cascode-connected to the differential input stage.
- a cascode stage is provided.
- Each pair of transistors is commonly connected to the gate, and a predetermined bias voltage Vb0, Vb1, Vb2 is applied to a common gate terminal from a bias circuit (not shown), or a potential of an internal node is applied to form a current mirror circuit. To do.
- Such a folded cascode type comparator has an advantage that the input voltage range to the input differential transistor pair can be expanded as compared with the comparator of FIG.
- a folded cascode type in which N-channel MOSFETs are used as shown in FIG. 1 and constant current transistors Q5, Q6 are provided on the ground potential GND side.
- Other comparators are also possible.
- FIG. 4 shows an embodiment in which the comparator according to the present invention is used for a PWM comparator in a current mode control type DC-DC converter having the configuration shown in FIG.
- the DC-DC converter of FIG. 4 includes a driving switching transistor SW1 and a rectifying switching transistor SW2 formed of an N-channel MOSFET connected in series between a voltage input terminal IN to which a DC voltage Vin is input and a ground point GND. , A coil (inductor) Lc connected between a connection node N1 of SW1 and SW2 and an output terminal OUT, a switching control circuit 10 for controlling on / off of the switching transistors SW1 and SW2, and the like. It is configured as a switching regulator. Further, a current sense resistor Rs for detecting a current flowing through the coil Lc through SW1 is connected between the voltage input terminal IN and the driving switching transistor SW1. LD is a load connected to the output terminal OUT of the DC-DC converter, and Cs is a smoothing capacitor.
- the switching control circuit 10 is configured as a control IC on one semiconductor chip, and the driving switching transistor SW1 and the rectifying switching transistor SW2 are discrete components. And is configured to be connected to the control IC as an external element.
- SW1 and SW2 may be formed on the same semiconductor chip as the control IC.
- the control IC 10 includes an error amplifier 11 that amplifies the potential difference between the output feedback voltage VFB and a predetermined reference voltage Vref, and an oscillation circuit, and generates a sawtooth wave SAW for slope compensation and a clock pulse Pc having a predetermined frequency.
- the generation circuit 12 includes a PWM comparator 13 that receives the sawtooth wave SAW generated by the waveform generation circuit 12, the output of the error amplifier 11, and the voltages Vs1 and Vs2 of both terminals of the current sense resistor Rs.
- control IC 10 includes an RS flip-flop 14 in which the clock pulse Pc generated by the waveform generation circuit 12 is input to the set terminal and the output of the PWM comparator 13 is input to the reset terminal, and the output Q, A level shift circuit 15 for level shifting / Q, and drive circuits (drivers) 16a and 16b for generating and outputting drive signals for turning on and off the switching transistors SW1 and SW2 based on the level shifted signal are provided.
- one cycle starts by setting the flip-flop 14 with the clock pulse Pc and turning on the driving switching transistor SW1.
- SW1 is turned on, the current IL flowing through the coil (inductor) increases, and the peak value is controlled by the feedback signal from the output voltage, that is, the output of the error amplifier 11.
- the output of the PWM comparator 13 is inverted, the flip-flop 14 is reset, and the driving switching transistor SW1 is turned off. Be controlled.
- the current sense resistor Rs is connected between the DC voltage input terminal IN and the driving switching transistor SW1, but the current sense resistor Rs is connected between the coil Lc and the output terminal OUT. They may be connected in series. However, when the current sense resistor Rs is connected between the coil Lc and the output terminal OUT, current flows through the coil and the resistor even when the transistor SW1 is turned off, whereas in the embodiment of FIG.
- the current sense resistor Rs is connected between the voltage input terminal IN and the transistor SW1 as in the DC-DC converter, current flows through the resistor only during the period when the SW1 is on, so that power loss is reduced. There is an advantage. Even when the current sense resistor Rs is connected between the node N1 between the coil Lc and the rectifying transistor SW2 and the transistor SW1, the power loss is small as in the embodiment of FIG.
- the on-resistance of the driving switching transistor SW1 may be substituted for the current sense resistor, thereby further reducing power loss.
- the voltage between both ends of the driving switching transistor SW1 may be input to the PWM comparator 13 only while the driving switching transistor SW1 is on.
- the switching control circuit 10 to which the comparator according to the present invention can be applied is not limited to the one having the configuration as shown in FIG. 4, and one using a one-shot multivibrator instead of the flip-flop 14 or level
- the shift circuit 15 may be omitted.
- the output voltage Vout is directly input to the error amplifier 11.
- a series resistor for dividing the output voltage Vout is provided, and the divided voltage is used as a feedback voltage for the error amplifier. 11 may be configured to input to the terminal 11.
- the present invention can also be applied to a step-up DC-DC converter.
- the present invention can also be applied to a diode rectification type DC-DC converter using a diode as a rectification element. it can.
- Switching control circuit (control IC) DESCRIPTION OF SYMBOLS 11 Error amplifier 12 Waveform generation circuit 13 PWM comparator 14 Flip-flop 15 Level shift circuit 16a, 16b Drive circuit LD Load Lc Coil (inductor) Cs Smoothing capacitor SW1 Coil drive switching transistor SW2 Rectification switching transistor AMP Current detection differential amplifier E-AMP Error amplifier
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Abstract
Description
Ki・Vs+Vsaw-Verr ……(1)
が正(>0)のときにハイレベルの信号を出力し、負(<0)のときにロウレベルの信号を出力するように設計される。なお、スロープ補償は、フィードバック制御系の発振を防止するため、電流帰還ループにおける変化の傾きを制御する技術であり、電流モード制御において従来より行なわれている。
直流電圧が入力される電圧入力端子と負荷が接続される出力端子との間に接続されたインダクタと、前記インダクタに電流を流す駆動素子と、出力電圧のフィードバック電圧に応じて前記駆動素子を制御する電圧制御ループと、前記電圧制御ループに前記インダクタに流れる電流の検出信号を帰還するループとを備えた電流モード制御方式のDC-DCコンバータの前記電圧制御ループに設けられるコンパレータであって、
前記コンパレータは、ソース共通接続された入力差動トランジスタ対を2組有する差動入力段と、前記2組の入力差動トランジスタ対の共通ソースにそれぞれ接続された2つの定電流源と、前記2組の入力差動トランジスタ対のドレイン側に接続され電流-電圧変換する共通の負荷素子と、前記差動入力段と前記負荷素子との結合点に接続された出力段と、を備え、
前記2組の入力差動トランジスタ対のうち一方の入力差動トランジスタ対の入力端子には前記出力電圧のフィードバック電圧とスロープ補償用の波形信号とが入力され、他方の入力差動トランジスタ対の入力端子には前記インダクタと直列をなすように接続された電流検出用抵抗の両端の電圧が入力されるように構成した。
前記コンパレータは、ソース共通接続された入力差動トランジスタ対を2組有する差動入力段と、前記2組の入力差動トランジスタ対の共通ソースにそれぞれ接続された2つの定電流源と、前記2組の入力差動トランジスタ対のドレイン側に接続され電流-電圧変換する共通の負荷素子と、前記差動入力段と前記負荷素子との結合点に接続された出力段と、を備え、
前記2組の入力差動トランジスタ対のうち一方の入力差動トランジスタ対の入力端子には前記出力電圧のフィードバック電圧とスロープ補償用の波形信号とが入力され、他方の入力差動トランジスタ対の入力端子には前記電流検出用抵抗の両端の電圧が入力されるようにした。
ΔI=Gm・ΔV ……(2)
で表わされる。電流-電圧変換部は、ΔIが正であればハイレベル(Vcc)を出力し、負でればロウレベル(GND)を出力する。
ΔI=Gm1(Vin(p1)-Vin(n1))+Gm2(Vin(p2)-Vin(n2)) ……(3)
で表わされ、ΔIが正であればハイレベル(Vcc)を出力し、負であればロウレベル(GND)を出力する。
ΔI=Gm1(Vsaw-Verr)+Gm2・Vs
=Gm1{(Gm2/Gm1)・Vs+Vsaw-Verr} ……(4)
のように、変形される。
11 誤差アンプ
12 波形生成回路
13 PWMコンパレータ
14 フリップフロップ
15 レベルシフト回路
16a,16b 駆動回路
LD 負荷
Lc コイル(インダクタ)
Cs 平滑コンデンサ
SW1 コイル駆動用スイッチングトランジスタ
SW2 整流用スイッチングトランジスタ
AMP 電流検出用差動アンプ
E-AMP 誤差アンプ
Claims (6)
- 直流電圧が入力される電圧入力端子と負荷が接続される出力端子との間に接続されたインダクタと、前記インダクタに電流を流す駆動素子と、出力電圧のフィードバック電圧に応じて前記駆動素子を制御する電圧制御ループと、前記電圧制御ループに前記インダクタに流れる電流の検出信号を帰還するループとを備えた電流モード制御方式のDC-DCコンバータの前記電圧制御ループに設けられるコンパレータであって、
前記コンパレータは、ソース共通接続された入力差動トランジスタ対を2組有する差動入力段と、前記2組の入力差動トランジスタ対の共通ソースにそれぞれ接続された2つの定電流源と、前記2組の入力差動トランジスタ対のドレイン側に接続され電流-電圧変換する共通の負荷素子と、前記差動入力段と前記負荷素子との結合点に接続された出力段と、を備え、
前記2組の入力差動トランジスタ対のうち一方の入力差動トランジスタ対の入力端子には前記出力電圧のフィードバック電圧とスロープ補償用の波形信号とが入力され、他方の入力差動トランジスタ対の入力端子には前記インダクタと直列をなすように接続された電流検出用抵抗の両端の電圧が入力されることを特徴とするコンパレータ。 - 前記入力差動トランジスタ対のドレイン端子にフォールデッドカスコード接続されたカスコード段を備えることを特徴とする請求項1に記載のコンパレータ。
- 直流電圧が入力される電圧入力端子と負荷が接続される出力端子との間に接続されたインダクタと、前記インダクタに電流を流す駆動素子と、前記インダクタと直列をなすように接続された電流検出用抵抗と、コンパレータを有し出力電圧のフィードバック電圧に応じて前記駆動素子を制御する電圧制御ループと、前記電圧制御ループに前記インダクタに流れる電流の検出信号を帰還するループとを備えた電流モード制御方式のDC-DCコンバータであって、
前記コンパレータは、ソース共通接続された入力差動トランジスタ対を2組有する差動入力段と、前記2組の入力差動トランジスタ対の共通ソースにそれぞれ接続された2つの定電流源と、前記2組の入力差動トランジスタ対のドレイン側に接続され電流-電圧変換する共通の負荷素子と、前記差動入力段と前記負荷素子との結合点に接続された出力段と、を備え、
前記2組の入力差動トランジスタ対のうち一方の入力差動トランジスタ対の入力端子には前記出力電圧のフィードバック電圧とスロープ補償用の波形信号とが入力され、他方の入力差動トランジスタ対の入力端子には前記電流検出用抵抗の両端の電圧が入力されることを特徴とするDC-DCコンバータ。 - 前記コンパレータは、前記入力差動トランジスタ対のドレイン端子にフォールデッドカスコード接続されたカスコード段を備えることを特徴とする請求項3に記載のDC-DCコンバータ。
- 前記駆動素子が前記電圧入力端子と前記インダクタとの間に接続されている場合に、前記電流検出用抵抗は、前記電圧入力端子と前記インダクタとの間に前記駆動素子と直列をなすように接続されていることを特徴とする請求項3または4に記載のDC-DCコンバータ。
- 前記電流検出用抵抗は前記駆動素子のオン抵抗であり、前記他方の入力差動トランジスタ対の入力端子に前記駆動素子の両端電圧が入力されていることを特徴とする請求項3または4に記載のDC-DCコンバータ。
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CN2010800133446A CN102362418A (zh) | 2009-03-23 | 2010-03-10 | 比较器以及dc-dc变换器 |
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GB201200342D0 (en) * | 2012-01-10 | 2012-02-22 | Texas Instr Cork Ltd | Hybrid peak/average current mode control using digitally assisted analog control schemes |
KR20170125916A (ko) * | 2015-03-05 | 2017-11-15 | 리니어 테크놀러지 엘엘씨 | 저전압 임계의 정확한 검출 |
US10277141B2 (en) * | 2016-09-15 | 2019-04-30 | Psemi Corporation | Current protected integrated transformer driver for isolating a DC-DC convertor |
CN107134989A (zh) * | 2017-05-30 | 2017-09-05 | 长沙方星腾电子科技有限公司 | 一种比较器电路 |
KR101977534B1 (ko) * | 2018-03-21 | 2019-05-10 | 선전 챌운 세미컨덕터 컴퍼니 리미티드 | 전류 모드 제어 방식의 스위칭 모드 전력공급장치와 그 장치에서의 신호발생방법 |
CN113965078A (zh) * | 2021-09-16 | 2022-01-21 | 天津大学 | 基于异质集成的高功率密度同步升压dc-dc转换芯片 |
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