CN104038041A - Switching power supply soft start circuit for bipolar error amplifier - Google Patents
Switching power supply soft start circuit for bipolar error amplifier Download PDFInfo
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- CN104038041A CN104038041A CN201410306923.XA CN201410306923A CN104038041A CN 104038041 A CN104038041 A CN 104038041A CN 201410306923 A CN201410306923 A CN 201410306923A CN 104038041 A CN104038041 A CN 104038041A
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Abstract
The invention relates to the technical field of analogue integrated circuits, in particular to design of a switching power supply soft start circuit for a bipolar error amplifier. The switching power supply soft start circuit for the bipolar error amplifier comprises a reference voltage switching circuit and an error amplifier biasing circuit, and stable switching from beginning to end of a soft start process is achieved according to a clamping feedback principle. The switching power supply soft start circuit for the bipolar error amplifier has the advantages that generalizability is achieved, the input requirements of the bipolar error amplifier and the input requirements of an MOS type error amplifier can be met at the same time, glitch voltages cannot be generated in a power-on process in the switching power supply soft start circuit for the bipolar error amplifier, smooth transition can be achieved, and therefore the stability and the reliability of a system can be improved.
Description
Technical field
The present invention relates to analog integrated circuit technical field, relate to specifically a kind of design of the soft start circuit of switch power supply that is applicable to ambipolar error amplifier.
Background technology
Soft starting circuit is a kind of conventional integrated circuit modules in analog integrated circuit design.It is mainly used in switching power source chip, chip can be because output sampled voltage and the larger difference of reference voltage cause the long-time conducting of switching tube or larger spike burr voltage in the moment powering on, thereby this can make switching tube damage system is caused to expendable destruction, the effect of soft starting circuit is exactly the duty ratio of power-limiting pipe driving voltage while powering on, make output voltage smoothly increase, thereby guarantee that chip can normally work in power up, improve stability and the reliability of chip.
The common way of soft starting circuit is that switching power source chip arranges soft start pin, external soft start capacitor, charge to soft start capacitor by internal current source, make soft start pin voltage increase gradually, simultaneously in the soft start stage using soft start pin voltage as reference voltage, duty ratio is increased gradually, output voltage also raises thereupon gradually, and after the soft start stage finishes, circuit switches to fixed reference voltage, switching power source chip is normally worked, stable output voltage.
Traditional soft starting circuit is whether the voltage that detects soft start pin by comparator reaches threshold value, comparator upset in the time reaching threshold value, and control switch switches to fixed reference voltage, completes soft start-up process, and Switching Power Supply is normally worked.Although this mode is simple, shortcoming equally clearly: first, in the process of switching over, can produce burr voltage, this burr voltage can be coupled on the reference voltage of error amplifier, thereby affects the output of Switching Power Supply; Secondly, the soft start stage, the reference signal that soft starting circuit offers system rises to a tempolabile signal of reference voltage often gradually from zero potential, this tempolabile signal need to be served as the input of operational amplifier conventionally, and because operational amplifier exists the requirement of certain input common-mode range, cannot ensure to contain completely whole excursions of this tempolabile signal, so this structure cannot meet the requirement of error amplifier common-mode input range conventionally, cause nonlinear problem; Again, in a lot of quick response systems, adopt ambipolar error amplifier to meet larger mutual conductance requirement, and traditional soft starting circuit cannot provide input bias current to bipolar device undoubtedly.Therefore, traditional soft starting circuit has significant limitation.
Summary of the invention
Object of the present invention, is exactly simple for above-mentioned existing soft start circuit structure, poor stability, and the problem that applicability is limited, proposes a kind of soft starting circuit for quick response system.
Technical scheme of the present invention is that a kind of soft start circuit of switch power supply for ambipolar error amplifier, is characterized in that, comprises reference voltage commutation circuit and error amplifier biasing circuit; Described reference voltage commutation circuit is by the first operational amplifier OP1, the second operational amplifier OP2, NMOS pipe MNA1, MNA2, MNA3, MNA4, MNA5, PMOS pipe MPA1, MPA3, MPA5, MPA6, the first bias current sources I
b1, capacitor C
sSform; Wherein, the in-phase input end of the first operational amplifier OP1 meets bias current sources I
b1output, the source electrode of its anti-phase input termination MNA1, the grid of its output termination MNA1 and the grid of MNA3; Bias current sources I
b1output pass through capacitor C
sSrear ground connection; The in-phase input end of the second operational amplifier OP2 meets outside reference voltage VREF2, its inverting input and the interconnection of its output, the drain electrode of its output termination MPA1 and the drain electrode of MNA1; The source electrode of MPA1 meets power supply VCC, and its grid connects the grid of MPA3, and its drain electrode connects the drain electrode of MNA1; The source electrode of MNA1 connects the drain electrode of MNA2; The source ground VSS of MNA2, its grid connects the grid of MNA4 and the grid of MNA5; The source ground VSS of MNA4, its grid connects the grid of MNA5, and its drain electrode connects the source electrode of MNA3; The drain electrode of MNA3 connects the drain electrode of MPA3; The source electrode of MPA3 meets power supply VCC, its grid and drain electrode interconnection; The source electrode of MPA5 meets power supply VCC, and its drain electrode connects the source electrode of MPA6; The grid of MPA6 connects the output of the first operational amplifier, and its drain electrode connects the drain electrode of MNA5; The grid of MNA5 and drain electrode interconnection, its source ground VSS;
Described error amplifier circuit is managed MPA7, MPA9, MPA10, MPA11, MPA13, MPA15, MPA16, MPA17, MPA18, MPA19, MPA20, MPA21, MPA22 by PMOS, NMOS pipe MNA7, MNA8, MNA11, MNA12, diode D1, D2, D3, D4, D5, D6, resistance R A1, the second bias current sources I
b2form; Wherein, the source electrode of MPA7 meets power supply VCC, and its grid connects the grid of MPA5, and its drain electrode connects the source electrode of MPA22 by resistance R A1; The grid of MPA22 and grounded drain VSS; The gate interconnection of MPA7, MPA9, MPA10, MPA11, MPA13, MPA15, MPA19; The source electrode of MPA9 meets power supply VCC, and its drain electrode connects the source electrode of MPA10; The gate interconnection of MPA10, MPA22, MNA11, MNA12, MPA16; The drain electrode of MPA10 connects the positive pole of D1 and the drain electrode of MNA11 makes the first output of soft starting circuit; The negative pole of D1 connects the positive pole of D5; The anodal tie point of the negative pole of D1 and D5 connects the tie point of the positive pole of D3 and the drain electrode of MPA11; The negative pole of D5 and D3 connects the inverting input of the first operational amplifier OP1; The source electrode of MPA11 meets power supply VCC; The source electrode of MNA11 connects the tie point of the positive pole of D3 and the drain electrode of MPA11; The negative pole of D3 connects the grid of MPA20; The source electrode of MPA20 connects the drain electrode of MPA7 and the tie point of resistance R A1, and its drain electrode connects the drain electrode of MNA7; The grid of MNA7 and drain electrode interconnection, its grid connects the grid of MNA8, its source ground VSS; The source ground VSS of MNA8, its drain electrode connects the drain electrode of MPA21; The grid of MPA21 connects the output of the first operational amplifier OP1, and its source electrode connects the drain electrode of MPA18; The source electrode of MPA18 meets power supply VCC, its grid and drain electrode interconnection, and its grid connects the grid of MPA17; The source electrode of MPA17 meets power supply VCC, and its drain electrode connects the drain electrode of MPA16; The source electrode of MPA16 connects the drain electrode of MPA15, the second output that the tie point of its drain electrode and the positive pole of D6 and the drain electrode of MNA12 is soft starting circuit; The source ground power supply VCC of MPA15; The anodal tie point of the source electrode of MNA12 and D2 connects the drain electrode of MPA13 and the anodal tie point of D4; The negative pole of D6 connects the drain electrode of MPA13 and the anodal tie point of D4; The negative pole of D2 connects the negative pole of D4; The source electrode of MPA13 meets power supply VCC; The source electrode of MPA19 meets power supply VCC, its grid and drain electrode interconnection, and its drain electrode meets the second bias current sources I
b2positive pole, the second bias current sources I
b2minus earth VSS.
Beneficial effect of the present invention is, there is general applicability, can meet the input requirements of ambipolar error amplifier and MOS type error amplifier, and this circuit there will not be burr voltage in power up simultaneously, can realize and seamlessly transitting, thus stability and the reliability of raising system.
Brief description of the drawings
The soft start circuit of switch power supply that Fig. 1 is traditional;
Fig. 2 is the soft starting circuit for quick response system of the present invention;
Fig. 3 is application schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described
Existing conventional softer start-up circuit utilizes comparator and switching over principle, as shown in Figure 1, in the time that chip just powers on, C
sS1terminal potential V
sS1=0, meanwhile DC current source I
b11start C
sS1charging, makes V
sS1voltage raises gradually, now V
rEF1>V
sS1, comparator C OM2 exports high level, and switching tube MN1 opens, comparator C OM1 output low level, switching tube MN2 turn-offs, and error amplifier is by V
sS1voltage as reference voltage, utilize the duty ratio of loop feedback principle by-pass cock pipe drive waveforms, the output voltage of Switching Power Supply is raise gradually, work as C
sS1terminal voltage V
sS1be increased to V
rEF1time, comparator C OM2 is triggered, and output is turned to low level by high level, and switching tube MN1 turn-offs, and COM1 output is turned to high level by low level, and switching tube MN2 opens, and error amplifier is by stable reference voltage V
rEF1as reference voltage, system completes soft start-up process, starts normally to work.But there are the factors of instability in this structure, first, comparator can make switching tube export in rising or decline process for saturation condition at comparator because of limited slope in the process of upset, this can make the reference voltage of error amplifier uncertain undoubtedly, affects the stability of system output; Secondly, this structure cannot be applied in the system of ambipolar error amplifier, because ambipolar entering apparatus needs certain base current, so likely change reference voltage V
rEF1size; Again, use N-type input difference to pipe during when the requirement in order to meet high transconductance, this structure cannot meet the requirement of error amplifier for common-mode input range.
For this problem, the present invention proposes to utilize clamp feedback principle, realize soft start-up process steady switching from start to end, apply dexterously diode and fixed bias current simultaneously, for the input pipe of rear class error amplifier provides biasing, make the present invention can be applied to the error amplifier of N-type differential pair tube, improved range of application of the present invention.
As shown in Figure 2, be electrical block diagram of the present invention, comprise reference voltage commutation circuit and error amplifier biasing circuit; Described reference voltage commutation circuit is by the first operational amplifier OP1, the second operational amplifier OP2, NMOS pipe MNA1, MNA2, MNA3, MNA4, MNA5, PMOS pipe MPA1, MPA3, MPA5, MPA6, the first bias current sources I
b1, capacitor C
sSform; Wherein, the in-phase input end of the first operational amplifier OP1 meets bias current sources I
b1output, the source electrode of its anti-phase input termination MNA1, the grid of its output termination MNA1 and the grid of MNA3; Bias current sources I
b1output pass through capacitor C
sSrear ground connection; The in-phase input end of the second operational amplifier OP2 meets outside reference voltage VREF, its inverting input and the interconnection of its output, the drain electrode of its output termination MPA1 and the drain electrode of MNA1; The source electrode of MPA1 meets power supply VCC, and its grid connects the grid of MPA3, and its drain electrode connects the drain electrode of MNA1; The source electrode of MNA1 connects the drain electrode of MNA2; The source ground VSS of MNA2, its grid connects the grid of MNA4 and the grid of MNA5; The source ground VSS of MNA4, its grid connects the grid of MNA5, and its drain electrode connects the source electrode of MNA3; The drain electrode of MNA3 connects the drain electrode of MPA3; The source electrode of MPA3 meets power supply VCC, its grid and drain electrode interconnection; The source electrode of MPA5 meets power supply VCC, and its drain electrode connects the source electrode of MPA6; The grid of MPA6 connects the output of the first operational amplifier, and its drain electrode connects the drain electrode of MNA5; The grid of MNA5 and drain electrode interconnection, its source ground VSS;
Described error amplifier biasing circuit is managed MPA7, MPA9, MPA10, MPA11, MPA13, MPA15, MPA16, MPA17, MPA18, MPA19, MPA20, MPA21, MPA22 by PMOS, NMOS pipe MNA7, MNA8, MNA11, MNA12, diode D1, D2, D3, D4, D5, D6, resistance R A1, the second bias current sources I
b2form; Wherein, the source electrode of MPA7 meets power supply VCC, and its grid connects the grid of MPA5, and its drain electrode connects the source electrode of MPA22 by resistance R A1; The grid of MPA22 and grounded drain VSS; The gate interconnection of MPA7, MPA9, MPA10, MPA11, MPA13, MPA15, MPA19; The source electrode of MPA9 meets power supply VCC, and its drain electrode connects the source electrode of MPA10; The gate interconnection of MPA10, MPA6, MNA11, MNA12, MPA16; The drain electrode of MPA10 connects the positive pole of D1 and the drain electrode of MNA11 makes the first output of soft starting circuit; The negative pole of D1 connects the positive pole of D5; The anodal tie point of the negative pole of D1 and D5 connects the tie point of the positive pole of D3 and the drain electrode of MPA11; The negative pole of D5 and D3 connects the inverting input of the first operational amplifier OP1; The source electrode of MPA11 meets power supply VCC; The source electrode of MNA11 connects the tie point of the positive pole of D3 and the drain electrode of MPA11; The negative pole of D3 connects the grid of MPA20; The source electrode of MPA20 connects the drain electrode of MPA7 and the tie point of resistance R A1, and its drain electrode connects the drain electrode of MNA7; The grid of MNA7 and drain electrode interconnection, its grid connects the grid of MNA8, its source ground VSS; The source ground VSS of MNA8, its drain electrode connects the drain electrode of MPA21; The grid of MPA21 connects the output of the first operational amplifier OP1, and its source electrode connects the drain electrode of MPA18; The source electrode of MPA18 meets power supply VCC, its grid and drain electrode interconnection, and its grid connects the grid of MPA17; The source electrode of MPA17 meets power supply VCC, and its drain electrode connects the drain electrode of MPA16; The source electrode of MPA16 connects the drain electrode of MPA15, the second output that the tie point of its drain electrode and the positive pole of D6 and the drain electrode of MNA12 is soft starting circuit; The source ground power supply VCC of MPA15; The anodal tie point of the source electrode of MNA12 and D2 connects the drain electrode of MPA13 and the anodal tie point of D4; The negative pole of D6 connects the drain electrode of MPA13 and the anodal tie point of D4; The negative pole of D2 connects the negative pole of D4; The source electrode of MPA13 meets power supply VCC; The source electrode of MPA19 meets power supply VCC, its grid and drain electrode interconnection, and its drain electrode meets the second bias current sources I
b2positive pole, the second bias current sources I
b2minus earth VSS.
The connected mode of soft starting circuit of the present invention and rear class error amplifier as shown in Figure 3, is described operation principle of the present invention according to power up below:
1. soft start-up process powers on
In the time that chip one powers on, I
b1start to C
sScharging, C
sSon voltage V
sS2rise gradually, amplifier OP1 and MNA1 form clamper feedback circuit makes V
a=V
sS2, now, V
b-V
a=V
rEF2-V
a>V
out1-V
a-V
tHN, NMOS pipe MNA1 is operated in saturation region, so A point voltage V
abe not subject to B point voltage V
bimpact.Now V
oUT1output voltage is lower, and PMOS pipe MPA6 opens, MPA5 mirror image bias current I
b2flow into MNA5, biasing is provided to metal-oxide-semiconductor MNA4 and MNA2, make bias diode D3, the electric current of D5 can flow into MNA2 by A point.In biasing circuit part, in the time of chip power, V
oUT1voltage ratio is lower, and switching tube MPA10 and MPA16 open, and MNA11 and MNA12 turn-off, therefore MPA15 and MPA9 mirror image I
b2flow into respectively bias diode D1 and D6, two bursts of identical currents of flow through MPA9 and MPA11 flow into D3 and D5, and two bursts of identical currents of flow through MPA13 and MPA15 flow into D2 and D4, so can obtain:
∵I
D3＝I
D5＝I
B2?∴V
D3＝V
D5＝V
D1＝V
D6＝V
D
V
INP＝V
A+V
D5+V
D1＝V
A+2V
D
In like manner can obtain:
V
INN＝V
FB+V
D2+V
D6＝V
FB+2V
D
In formula, I
d3, I
d5be respectively diode D3, the electric current on D5, I
b2for bias current sources, V
d1, V
d2, V
d3, V
d5, V
d6be respectively diode D1, D2, D3, D5, the pressure drop on D6, V
afor A point voltage, V
fBfor feedback voltage, the first output V of soft starting circuit
iNPthe second output V with soft starting circuit
iNNconnect respectively positive input terminal and the negative input end of error amplifier.Again because V
d1=V
d6, V
d2=V
d5so, utilize Switching Power Supply feedback principle, adjustable V
fB=V
a=V
sS2thereby, not only meet the requirement of stability while powering on, also met the requirement of rear class error amplifier common mode input by two diode drops.MPA7 in Fig. 2, RA1, MPA22, MPA20, MNA7, MNA8, MPA21, MPA18, MPA17 forms initial condition compensating circuit.Its effect is that, in the time that chip just powers on, because flow through diode D1, the electric current of D3 and D5 need to flow through transistor MNA2, so V
a>0, V
fB=0, this state likely can cause soft start-up process abnormal, affects the normal startup of system, in order to address this problem, adds initialization compensating circuit, and the value that resistance R A1 is set makes V
sGP20=V
c-V
a>|V
tHP|, wherein V
sGP20for source-gate voltage of MPA20, V
cthe voltage of ordering for C.The electric current of the upper generation of MPA20 flows into V by current mirror
iNN, raise V
iNNcurrent potential, guarantee system initially can normally start powering on.Along with the foundation gradually of start-up course, the grid potential of MPA20, i.e. A point current potential, lifting gradually, reduces the electric current that flows through MPA20 gradually, finally eliminates the offset voltage between VINP and VINN.
2. soft start terminal procedure
Work as V
aalong with V
sS2increase until approach V gradually
btime, MNA1 can enter linear zone, now V
a=V
b=V
rEF2, A point voltage is clamped at V
a=V
rEF2place cannot be with V
sS2continue to increase, so amplifier OP1 output high level completes the switching that soft start finishes.Now, metal-oxide-semiconductor MPA6, MPA10, MPA16, MPA21 turn-offs, switching tube MNA11, MNA12 opens and carries out linear zone, therefore can obtain:
V
INP＝V
DSN11+V
D5+V
A≈V
D'+V
REF2
V
INN＝V
DSN12+V
D2+V
FB≈V
D'+V
FB
In formula, V
dSN11for the drain-source voltage of MNA11 now, V
dSN12for the drain-source voltage of MNA12, V
d' be the now pressure drop on diode, again because V
d2=V
d5=V
d', so utilize Switching Power Supply feedback principle, adjustable V
fB=V
rEF2thereby, meeting on the basis of system stability output requirement, met the requirement of rear class error amplifier common mode input by a diode drop.
Comprehensive above analysis can obtain, soft starting circuit of the present invention adopts the principle of clamp feedback soft handover, not only can ensure system stability and complete soft start-up process, realize reference voltage level conversion and bias current output at chip internal, make it to meet the input requirements of N-type MOS and ambipolar error amplifier simultaneously.In addition, the circuit that the present invention proposes can be avoided the impact of circuit initial potential on system effectively, realizes more preferably soft start-up process.
Claims (1)
1. for a soft start circuit of switch power supply for ambipolar error amplifier, it is characterized in that, comprise reference voltage commutation circuit and error amplifier biasing circuit; Described reference voltage commutation circuit is by the first operational amplifier OP1, the second operational amplifier OP2, NMOS pipe MNA1, MNA2, MNA3, MNA4, MNA5, PMOS pipe MPA1, MPA3, MPA5, MPA6, the first bias current sources I
b1, capacitor C
sSform; Wherein, the in-phase input end of the first operational amplifier OP1 meets bias current sources I
b1output, the source electrode of its anti-phase input termination MNA1, the grid of its output termination MNA1 and the grid of MNA3; Bias current sources I
b1output pass through capacitor C
sSrear ground connection; The in-phase input end of the second operational amplifier OP2 meets outside reference voltage VREF2, its inverting input and the interconnection of its output, the drain electrode of its output termination MPA1 and the drain electrode of MNA1; The source electrode of MPA1 meets power supply VCC, and its grid connects the grid of MPA3, and its drain electrode connects the drain electrode of MNA1; The source electrode of MNA1 connects the drain electrode of MNA2; The source ground VSS of MNA2, its grid connects the grid of MNA4 and the grid of MNA5; The source ground VSS of MNA4, its grid connects the grid of MNA5, and its drain electrode connects the source electrode of MNA3; The drain electrode of MNA3 connects the drain electrode of MPA3; The source electrode of MPA3 meets power supply VCC, its grid and drain electrode interconnection; The source electrode of MPA5 meets power supply VCC, and its drain electrode connects the source electrode of MPA6; The grid of MPA6 connects the output of the first operational amplifier, and its drain electrode connects the drain electrode of MNA5; The grid of MNA5 and drain electrode interconnection, its source ground VSS;
Described error amplifier circuit is managed MPA7, MPA9, MPA10, MPA11, MPA13, MPA15, MPA16, MPA17, MPA18, MPA19, MPA20, MPA21, MPA22 by PMOS, NMOS pipe MNA7, MNA8, MNA11, MNA12, diode D1, D2, D3, D4, D5, D6, resistance R A1, the second bias current sources I
b2form; Wherein, the source electrode of MPA7 meets power supply VCC, and its grid connects the grid of MPA5, and its drain electrode connects the source electrode of MPA22 by resistance R A1; The grid of MPA22 and grounded drain VSS; The gate interconnection of MPA7, MPA9, MPA10, MPA11, MPA13, MPA15, MPA19; The source electrode of MPA9 meets power supply VCC, and its drain electrode connects the source electrode of MPA10; The gate interconnection of MPA10, MPA22, MNA11, MNA12, MPA16; The drain electrode of MPA10 connects the positive pole of D1 and the drain electrode of MNA11 makes the first output of soft starting circuit; The negative pole of D1 connects the positive pole of D5; The anodal tie point of the negative pole of D1 and D5 connects the tie point of the positive pole of D3 and the drain electrode of MPA11; The negative pole of D5 and D3 connects the inverting input of the first operational amplifier OP1; The source electrode of MPA11 meets power supply VCC; The source electrode of MNA11 connects the tie point of the positive pole of D3 and the drain electrode of MPA11; The negative pole of D3 connects the grid of MPA20; The source electrode of MPA20 connects the drain electrode of MPA7 and the tie point of resistance R A1, and its drain electrode connects the drain electrode of MNA7; The grid of MNA7 and drain electrode interconnection, its grid connects the grid of MNA8, its source ground VSS; The source ground VSS of MNA8, its drain electrode connects the drain electrode of MPA21; The grid of MPA21 connects the output of the first operational amplifier OP1, and its source electrode connects the drain electrode of MPA18; The source electrode of MPA18 meets power supply VCC, its grid and drain electrode interconnection, and its grid connects the grid of MPA17; The source electrode of MPA17 meets power supply VCC, and its drain electrode connects the drain electrode of MPA16; The source electrode of MPA16 connects the drain electrode of MPA15, the second output that the tie point of its drain electrode and the positive pole of D6 and the drain electrode of MNA12 is soft starting circuit; The source ground power supply VCC of MPA15; The anodal tie point of the source electrode of MNA12 and D2 connects the drain electrode of MPA13 and the anodal tie point of D4; The negative pole of D6 connects the drain electrode of MPA13 and the anodal tie point of D4; The negative pole of D2 connects the negative pole of D4; The source electrode of MPA13 meets power supply VCC; The source electrode of MPA19 meets power supply VCC, its grid and drain electrode interconnection, and its drain electrode meets the second bias current sources I
b2positive pole, the second bias current sources I
b2minus earth VSS.
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| CN201410306923.XA CN104038041B (en) | 2014-06-30 | 2014-06-30 | A kind of soft start circuit of switch power supply for ambipolar error amplifier |
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|---|---|---|---|
| CN201410306923.XA CN104038041B (en) | 2014-06-30 | 2014-06-30 | A kind of soft start circuit of switch power supply for ambipolar error amplifier |
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| CN104038041B CN104038041B (en) | 2016-08-31 |
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Cited By (4)
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| CN108258895A (en) * | 2018-02-05 | 2018-07-06 | 上海艾为电子技术股份有限公司 | Soft starting circuit and power-supply system |
| CN109917842A (en) * | 2019-04-16 | 2019-06-21 | 卓捷创芯科技（深圳）有限公司 | A kind of metastable clamper feedback start-up circuit of elimination automatic biasing band-gap reference degeneracy |
| CN109995331A (en) * | 2017-12-29 | 2019-07-09 | 北京同方微电子有限公司 | A kind of voltage regulator circuit for thering is soft start to protect |
| CN113949257A (en) * | 2021-10-19 | 2022-01-18 | 珠海智融科技股份有限公司 | Soft start circuit based on average current mode control system |
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| CN109995331B (en) * | 2017-12-29 | 2023-12-19 | 紫光同芯微电子有限公司 | Voltage stabilizing circuit with soft start protection |
| CN108258895A (en) * | 2018-02-05 | 2018-07-06 | 上海艾为电子技术股份有限公司 | Soft starting circuit and power-supply system |
| CN109917842A (en) * | 2019-04-16 | 2019-06-21 | 卓捷创芯科技（深圳）有限公司 | A kind of metastable clamper feedback start-up circuit of elimination automatic biasing band-gap reference degeneracy |
| CN113949257A (en) * | 2021-10-19 | 2022-01-18 | 珠海智融科技股份有限公司 | Soft start circuit based on average current mode control system |
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