CN107809176A - DC-DC converter and control method thereof - Google Patents
DC-DC converter and control method thereof Download PDFInfo
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- CN107809176A CN107809176A CN201610891686.7A CN201610891686A CN107809176A CN 107809176 A CN107809176 A CN 107809176A CN 201610891686 A CN201610891686 A CN 201610891686A CN 107809176 A CN107809176 A CN 107809176A
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000010168 coupling process Methods 0.000 claims description 12
- 238000005859 coupling reaction Methods 0.000 claims description 12
- 230000008878 coupling Effects 0.000 claims description 11
- 230000005611 electricity Effects 0.000 claims description 8
- 230000001360 synchronised effect Effects 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 10
- 230000008901 benefit Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000006837 decompression Effects 0.000 description 2
- 239000003985 ceramic capacitor Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- 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
- H02M3/1582—Buck-boost converters
Abstract
The invention discloses a direct current-direct current converter and a control method thereof. The DC-DC converter includes a first power switch, a second power switch, an output pin, a feedback pin and a power switch control pin. The first power switch and the second power switch are both coupled to one end of the external inductor. The output pin is coupled to the second power switch. The feedback pin is coupled to the output pin. The power switch control pin is coupled to the first power switch and provides a first time signal to the first power switch. The compensating circuit is coupled between the feedback pin and the power switch control pin, and comprises an integrator, wherein the integrator receives a first time signal from the power switch control pin and provides a compensating signal to the feedback pin.
Description
Technical field
The present invention is relevant with change-over circuit, especially with regard to a kind of DC-DC converter and its control method.
Background technology
Known decompression DC is to current/direct-current conversion device (Buck DC-DC Converter) using fixed ON time
The mode of (Constant On Time, COT) controls, as shown in figure 1, it is needed by the ripple on output voltage Vout
(ripple) feedback and generation pulse-width modulation signal is triggered.When output capacitance Cout is using with low ESR
During multi-layer ceramic capacitance (Multi-layer Ceramic Capacitor, MLCC), it will so that output voltage Vout feedbacks
Ripple is too small, and excessively smooth feedback signal can be caused error amplifier A1 defeated by the inductance and capacitive effect in circuit
The comparison signal Comp gone out produces phase delay.When comparison signal Comp phase delay reaches 180 degree, it will be total to
Phenomenon of shaking and cause whole system unstable.
Known voltage boosting dc is to current/direct-current conversion device (Boost DC-DC Converter) using the fixed shut-in time
The mode of (Constant Off Time) controls, as shown in Fig. 2 being used as output capacitance according to multi-layer ceramic capacitance (MLCC)
Cout equally has the problem of ripple on output voltage is too small.If the directly control by the way of fixed ON time (COT)
System, especially when output capacitance Cout is using electrochemical capacitor, feedback signal even occurs anti-with ramp signal Ramp
The ripple of phase.If the compensation of phase is not carried out using appropriate compensation circuit, it is likely that the phenomenon that output can be caused to collapse occurs.
The content of the invention
In view of this, the present invention provides a kind of DC-DC converter and its control method, to solve prior art institute
The problem of addressing.
The preferred embodiment of the present invention is a kind of DC-DC converter.In this embodiment, direct current is to straight
Stream transformer couples compensation circuit and couples input voltage by external inductors.DC-DC converter is opened including the first electric power
Pass, the second power switch, output connecting pin, feedback pin and power switch control pin.First power switch couples external inductors
One end.Second power switch couples one end of external inductors.Output connecting pin couples the second power switch.Feedback pin coupling is defeated
Go out pin.Power switch control pin couples the first power switch, and provides very first time signal to the first power switch.Compensation
Circuit is coupled between feedback pin and power switch control pin, and compensation circuit includes integrator, and integrator is from power switch
Control pin to receive very first time signal, and provide thermal compensation signal to feedback pin.
In one embodiment of this invention, integrator includes resistance concatenated with one another and the first electric capacity, and the first of resistance
End coupling power switch control pin, the first electric capacity are coupled between the second end of resistance and earth terminal.
In one embodiment of this invention, integrator includes resistance concatenated with one another and the first electric capacity, and the first of resistance
End coupling power switch control pin, the first electric capacity are coupled to the second end of resistance and the output electricity of DC-DC converter
Pressure.
In one embodiment of this invention, compensation circuit also includes filter capacitor, and filter capacitor is coupled to integrator with returning
Award between pin.
In one embodiment of this invention, thermal compensation signal is ramp signal, and ramp signal is synchronous with very first time signal.
In one embodiment of this invention, DC-DC converter also includes constant on-time generation unit, respectively
Couple the first power switch and the second power switch.
In one embodiment of this invention, DC-DC converter also includes error amplifier and comparator, and error is put
Big device coupling compensation circuit and feedback pin, comparator are coupled between error amplifier and constant on-time generation unit.
According to the control method that another preferred embodiment of the present invention is DC-DC converter.In this embodiment
In, DC-DC converter includes constant on-time generation unit, power switch control pin and feedback pin, wherein electricity
Compensation circuit is coupled between power switch control pin and feedback pin.The control method includes：Produced by constant on-time
Unit provides very first time signal to the first power switch and controls pin；And very first time signal is handled using compensation circuit,
To provide thermal compensation signal to feedback pin.
Compared to prior art, DC-DC converter of the invention and its controlling party genealogy of law are using at compensation circuit
Control signal filters out the direct current component in ripple signal to produce ripple signal by the filter capacitor in compensation circuit, by
This produces stable and good ripple signal and phase compensation is carried out to feedback signal (feedbacksignal), and then produces stable
Control signal so that Boost direct currents are able to maintain that normal operation to DC converting system, can effectively avoid prior art
Output collapse phenomenon.
It can be obtained further by following detailed description of the invention and institute's accompanying drawings on the advantages and spirit of the present invention
Solution.
Brief description of the drawings
Fig. 1 is schematic diagram of the known Buck direct currents to DC converting system.
Fig. 2 is schematic diagram of the known Boost direct currents to DC converting system.
Fig. 3 is the DC-DC converter of a specific embodiment and the function block of compensation circuit according to the present invention
Figure.
Fig. 4 and Fig. 5 is the DC-DC converter and compensation electricity when the second end of the first electric capacity is coupled to earth terminal
The schematic diagram on road.
Fig. 6 is very first time signal when the second end of the first electric capacity is coupled to earth terminal, the second time signal, compensation
The timing diagram of signal and reference voltage.
Fig. 7 and Fig. 8 is the DC-DC converter and compensation when the second end of the first electric capacity is coupled to output connecting pin
The schematic diagram of circuit.
Fig. 9 is the very first time signal when the second end of the first electric capacity is coupled to output connecting pin, the second time signal, benefit
Repay the timing diagram of signal and reference voltage.
Figure 10 is the functional block diagram according to the DC-DC converting circuit of the another specific embodiment of the present invention.
Figure 11 is the flow chart according to the control method of the DC-DC converter of the another specific embodiment of the present invention.
Main element symbol description：
3：DC-DC converting circuit
30：DC-DC converter
32：Compensation circuit
Constant Off Time：Fixed shut-in time control logic circuit
FB：Feedback pin
LG：Power switch controls pin
IN：Integrator
S1：Time signal
S2：Thermal compensation signal
LX：Input pin
VCC：Supply voltage pin
EN：Enable pin
GND：It is grounded pin
OUT：Output connecting pin
L、L1：External inductors
Vin：Input voltage
Cin：Input capacitance
SEN：Enable signal
Vout：Output voltage
Cout：External output capacitance
R1~R2：Non-essential resistance
Rj：Resistance
Cj：First electric capacity
Cf：Second electric capacity
S0：Second time signal
M1：First power switch
M2：Second power switch
COT：Control logic circuit
A1：First error amplifier
A2：Second error amplifier
VFB：Feedback voltage
Vref：Reference voltage
Comp：Comparison signal
Ramp：Ramp signal
Ton：ON time
S10~S12：Step
Embodiment
Now with detailed reference to the one exemplary embodiment of the present invention, and illustrate the reality of the one exemplary embodiment in the accompanying drawings
Example.Element/component of the same or like label used in schema and embodiment is for representing same or like part.
A preferred embodiment according to the present invention is a kind of DC-DC converter (DC-DC converter).
Decompression DC can be applied to voltage boosting dc to DC converting system to direct current transducer (Buck DC-DC Converter)
In (Boost DC-DC Converting System), but it is not limited.Fig. 3 is refer to, Fig. 3 is the direct current of the present embodiment
The functional block diagram of compensation circuit 32 is coupled to direct current transducer 30.
As shown in figure 3, DC-DC converter 30 includes feedback pin FB and power switch control pin LG.Compensation electricity
Road 32 includes integrator IN.Feedback pin FB and power switch control the pin LG of DC-DC converter 30 are respectively coupled to mend
Repay the integrator IN of circuit 32.The power switch control pin LG of DC-DC converter 30 provides very first time signal S1 extremely
The integrator IN of compensation circuit 32.When integrator IN receives very first time signal S1 from power switch control pin LG, product
Device IN is divided to integrate very first time signal S1 to provide thermal compensation signal S2 to feedback pin FB.In this embodiment, compensation circuit
Thermal compensation signal S2 caused by 32 is a ramp signal, and synchronous with very first time signal S1, but is not limited.
Then Fig. 4 is refer to, in an embodiment, DC-DC converter 30 includes input pin LX, output connecting pin
OUT, power switch control pin LG, feedback pin FB, supply voltage pin VCC, enable pin EN and ground connection pin GND.Mend
Repaying circuit 32 includes resistance Rj, the first electric capacity Cj and the second electric capacity Cf, wherein integrator IN include resistance Rj concatenated with one another with
First electric capacity Cj.
It is outside in DC converting system, inputting pin LX couplings in the Boost direct currents of fixed ON time (COT) control
Inductance L first end, and input voltage vin is received by external inductors L.Supply voltage pin VCC couples input voltage vin.
It should be noted that if in Buck direct currents in DC converting system, pin LX can still couple external inductors L, but it is as phase
Position pin (PHASE) with output connecting pin (OUT) and output voltage Vout is provided.
Outside input electric capacity Cin first end is also coupled between external inductors L the second end and input voltage vin, outside
Portion input capacitance Cin the second end is coupled to earth terminal GND.Enable pin EN is receiving an enable signal SEN.
Output connecting pin OUT is to export an output voltage Vout, and external output capacitance Cout is coupled to output connecting pin
Between OUT and earth terminal.Non-essential resistance R1 and R2 are serially connected between output voltage Vout and earth terminal.Feedback pin FB is coupled to
Between non-essential resistance R1 and R2.
Compensation circuit 32 is respectively coupled to the power switch control pin LG and feedback pin FB of DC-DC converter 30,
And compensation circuit 32 is also coupled between non-essential resistance R1 and R2.Resistance Rj is coupled to power switch control pin LG and second
Between electric capacity Cf；First electric capacity Cj first end is coupled between resistance Rj and the second electric capacity Cf, and the second of the first electric capacity Cj
End is coupled to earth terminal；Second electric capacity Cf first end coupling resistance Rj and the first electric capacity Cj；Second electric capacity Cf the second end coupling
It is connected between feedback pin FB and non-essential resistance R1 and R2.
Compensation circuit 32 is used as ripple signal generating circuit, and the second electric capacity Cf in compensation circuit 32 is to as filter
Ripple electric capacity, its function are filtered out in the direct current component in the ripple signal for being provided compensation circuit 32, are thus produced steady
Fixed and good ripple signal to carry out phase compensation to feedback signal so that system can maintain normal operation.
Due to voltage boosting dc to DC converting system using fixed shut-in time (Constant Off Time) mode control
System, if directly applying mechanically fixed ON time (Constant On Time) controller is likely to result in output collapse, therefore this
The signal source of the compensation circuit 32 of invention is that power switch controls pin LG (that is, bridge switch control pin), phase just meeting
Correctly, also just it is avoided that the phenomenon of output collapse occurs.
Fig. 5 is refer to, in an embodiment, DC-DC converter 30 also includes the first power switch M1, the second electricity
Power switch M2, control logic circuit COT, the first error amplifier A1 and the second error amplifier A2.
First power switch M1 is coupled between input pin LX and ground connection pin GND, and the first power switch M1
Gate couples control logic circuit COT and power switch control pin LG.First power switch M1 receives power switch control and connect
Very first time signal S1 that pin LG is exported simultaneously is operated according to very first time signal S1, and input voltage vin is converted to
Output voltage Vout.
Second power switch M2 is coupled between input pin LX and output connecting pin OUT, and the second power switch M2
Gate couples control logic circuit COT, to be operated according to the second time signal S0.Second time signal S0 and the very first time
Signal S1 is synchronous and anti-phase.That is very first time signal S1 is consistent with the second time signal S0 cycle but phase is opposite each other.
Control logic circuit COT is respectively coupled to the first power switch M1 gate, the second power switch M2 gate, electric power
Switch control pin LG, enable pin EN and the second error amplifier A2 output end；First error amplifier A1 positive input
End+reception reference voltage Vref and the first error amplifier A1 negative input end-coupling feedback pin FB are to receive feedback voltage
VFB, and the first error amplifier A1 the second error amplifier A2 of output end coupling positive input terminal+；Second error is amplified
The first error amplifier A1 of device A2 positive input terminal+and negative input end-be respectively coupled to output end and ramp signal Ramp, and
And second error amplifier A2 output end coupling control logic circuit COT.
It refer to Fig. 6, Fig. 6 is very first time signal S1 when the first electric capacity Cj the second end is coupled to earth terminal, the
Two time signal S0, thermal compensation signal S2 and reference voltage Vref timing diagram.As shown in fig. 6, mended caused by compensation circuit 32
It is a ramp signal to repay signal S2, and thermal compensation signal (ramp signal) S2 is synchronous with very first time signal S1.As for second
Time signal S0 is then synchronous and anti-phase with very first time signal S1.
When very first time signal S1 is in high phase place, the second time signal S0 is in low phase position, and thermal compensation signal S2 is past
On ramp signal；When very first time signal S1 is in low phase position, the second time signal S0 is in high phase place, thermal compensation signal S2
For ramp signal down.The time span that very first time signal S1 is maintained at high phase place is ON time Ton.
In addition to the embodiment of earth terminal being coupled to except the second end for the first electric capacity Cj that earlier figures 4 to Fig. 5 illustrate, first
Electric capacity Cj the second end is also coupled to output connecting pin OUT, to produce compensation letter according to output voltage Vout and control signal S1
Number S2, as shown in Fig. 7 to Fig. 8, the thermal compensation signal S2 of such a connection produces according to the very first time signal S1 and output voltage Vout,
DC-DC converter 30 can be made to have preferable response in output voltage Vout transitions (transient).Due to Fig. 7 to figure
8 with being only that the first electric capacity Cj the second end is coupled to output connecting pin OUT without being coupled to ground connection at Fig. 4 to Fig. 5 difference
End, therefore the detailed start situation of its circuit refer to previous embodiment, not repeated separately in this.
Fig. 9 is Fig. 7 and Fig. 8 very first time signal S1, the second time signal S0, thermal compensation signal S2 and reference voltage Vref
Timing diagram.Because the output voltage Vout of (Boost) system of boosting has the ripple anti-phase with thermal compensation signal S2 so that the first electricity
Hold the slope of thermal compensation signal (ramp signal) S2 caused by the compensation circuit 32 when Cj the second end is coupled to output connecting pin OUT
Thermal compensation signal (ramp signal) caused by compensation circuit 32 when the second end that can be less than the first electric capacity Cj is coupled to earth terminal
S2 slope.
Another preferred embodiment that Figure 10 is the present invention is voltage boosting dc to DC converting circuit.As shown in Figure 10,
DC-DC converting circuit 3 includes DC-DC converter 30 and compensation circuit 32.Compensation circuit 32 couples direct current to straight
Stream transformer 30.DC-DC converter 30 includes input pin LX, output connecting pin OUT, feedback pin FB, error amplifier
A1, power switch control pin LG, ground connection pin GND and the first power switch M1.Compensation circuit 32 includes an integrator IN.It is defeated
Enter pin LX and couple an external inductors L.Output connecting pin OUT couples an external output capacitance Cout.Error amplifier A1 is coupled back to
Award pin FB.Power switch control pin LG provide time signal S1 to the integrator IN and the first power switch of compensation circuit 32
M1.First power switch M1 is respectively coupled to input pin LX, power switch control pin LG and ground connection pin GND, and according to when
Between signal S1 operated.Integrator IN is respectively coupled to power switch control pin LG and feedback pin FB.Compensation circuit 32
Integrator IN receives time signal S1 from power switch control pin LG and produces thermal compensation signal S2 to feedback pin FB according to this.Extremely
The content of previous embodiment is refer in the detailed circuit structure of DC-DC converting circuit 3 and start, is not gone to live in the household of one's in-laws on getting married separately in this
State.
According to the control method that another preferred embodiment of the present invention is DC-DC converter.In this embodiment
In, DC-DC converter includes constant on-time generation unit, power switch control pin and feedback pin, wherein electricity
Compensation circuit is coupled between power switch control pin and feedback pin.
Figure 11 is refer to, Figure 11 is the controlling party according to the DC-DC converter of the another specific embodiment of the present invention
The flow chart of method.As shown in figure 11, the control method of DC-DC converter comprises the following steps.
Step S10：Very first time signal to the first power switch control is provided by constant on-time generation unit to connect
Pin；And
Step S12：Very first time signal is handled using compensation circuit, to provide thermal compensation signal to feedback pin.Compensation letter
It number can be ramp signal, but be not limited.
By the above detailed description of preferred embodiments, it is intended to more clearly describe the feature of the present invention with spiritual,
And not scope of the invention is any limitation as with above-mentioned disclosed preferred embodiment.On the contrary, the purpose is to uncommon
Various changes can be covered and have being arranged in the category of the scope of the claims to be applied of the invention of equality by hoping.
Claims (9)
1. a kind of DC-DC converter, couple a compensation circuit and couple an input voltage by an external inductors, it is special
Sign is that above-mentioned DC-DC converter includes：
One first power switch, couple one end of said external inductance；
One second power switch, couple one end of said external inductance；
One output connecting pin, couple above-mentioned second power switch；
One feedback pin, couple above-mentioned output connecting pin；And
One power switch controls pin, couples above-mentioned first power switch, and provides a very first time signal to the above-mentioned first electricity
Power switchs；
Wherein above-mentioned compensation circuit is coupled between above-mentioned feedback pin and above-mentioned power switch control pin, above-mentioned compensation circuit
Including an integrator, above-mentioned integrator receives above-mentioned very first time signal from above-mentioned power switch control pin, and provides one and mend
Signal is repaid to above-mentioned feedback pin.
2. DC-DC converter as claimed in claim 1, it is characterised in that above-mentioned integrator includes concatenated with one another one
Resistance and one first electric capacity, and the first end of above-mentioned resistance couples above-mentioned power switch control pin, above-mentioned first electric capacity coupling
Between the second end of above-mentioned resistance and an earth terminal.
3. DC-DC converter as claimed in claim 1, it is characterised in that above-mentioned integrator includes concatenated with one another one
Resistance and one first electric capacity, and the first end of above-mentioned resistance couples above-mentioned power switch control pin, above-mentioned first electric capacity coupling
In the second end of above-mentioned resistance and an output voltage of above-mentioned DC-DC converter.
4. DC-DC converter as claimed in claim 1, it is characterised in that above-mentioned compensation circuit also includes a filtered electrical
Hold, above-mentioned filter capacitor is coupled between above-mentioned integrator and above-mentioned feedback pin.
5. DC-DC converter as claimed in claim 1, it is characterised in that above-mentioned thermal compensation signal is a ramp signal,
And above-mentioned ramp signal is synchronous with above-mentioned very first time signal.
6. DC-DC converter as claimed in claim 1, it is characterised in that above-mentioned DC-DC converter also includes
One constant on-time generation unit, it is respectively coupled to above-mentioned first power switch and above-mentioned second power switch.
7. DC-DC converter as claimed in claim 5, it is characterised in that above-mentioned DC-DC converter also includes
One error amplifier and a comparator, above-mentioned error amplifier couple above-mentioned compensation circuit and above-mentioned feedback pin, above-mentioned comparison
Device is coupled between above-mentioned error amplifier and above-mentioned constant on-time generation unit.
8. a kind of control method of DC-DC converter, above-mentioned DC-DC converter produces including a constant on-time
Raw unit, power switch control pin and a feedback pin, wherein above-mentioned power switch control pin and above-mentioned feedback pin
Between couple a compensation circuit, it is characterised in that above-mentioned control method includes：
A very first time signal to above-mentioned first power switch, which is provided, by above-mentioned constant on-time generation unit controls pin；
And
Above-mentioned very first time signal is handled using above-mentioned compensation circuit, to provide a thermal compensation signal to above-mentioned feedback pin.
9. the control method of DC-DC converter as claimed in claim 8, it is characterised in that above-mentioned thermal compensation signal is one oblique
Ripple signal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW105129163 | 2016-09-08 | ||
| TW105129163A TW201813267A (en) | 2016-09-08 | 2016-09-08 | DC-DC converter and controlling method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107809176A true CN107809176A (en) | 2018-03-16 |
Family
ID=61576405
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610891686.7A Pending CN107809176A (en) | 2016-09-08 | 2016-10-13 | DC-DC converter and control method thereof |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107809176A (en) |
| TW (1) | TW201813267A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111224645A (en) * | 2018-11-26 | 2020-06-02 | 力智电子股份有限公司 | DC-DC conversion circuit and time signal generator thereof |
-
2016
- 2016-09-08 TW TW105129163A patent/TW201813267A/en unknown
- 2016-10-13 CN CN201610891686.7A patent/CN107809176A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111224645A (en) * | 2018-11-26 | 2020-06-02 | 力智电子股份有限公司 | DC-DC conversion circuit and time signal generator thereof |
| CN111224645B (en) * | 2018-11-26 | 2023-10-20 | 力智电子股份有限公司 | DC-DC conversion circuit and time signal generator thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201813267A (en) | 2018-04-01 |
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Application publication date: 20180316 |