CN101923365A - Low-dropout linear voltage-regulating circuit - Google Patents
Low-dropout linear voltage-regulating circuit Download PDFInfo
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- CN101923365A CN101923365A CN2009103032501A CN200910303250A CN101923365A CN 101923365 A CN101923365 A CN 101923365A CN 2009103032501 A CN2009103032501 A CN 2009103032501A CN 200910303250 A CN200910303250 A CN 200910303250A CN 101923365 A CN101923365 A CN 101923365A
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- regulating circuit
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Abstract
The invention relates to a low-dropout linear voltage-regulating circuit used for providing a voltage for a CCDS (Charge-Coupled Devices System). The low-dropout linear voltage-regulating circuit comprises a low-dropout linear voltage regulator, a capacitor, a voltage-regulating resistor and a first output end which is connected with the CCDS, the low-dropout linear voltage regulator comprises a second output end and used for accessing a DC power supply and converting the voltage value of the DC power supply so as to output to the first output end through the second output end, one end of the capacitor is connected between the first output end and the second output end, and the other end of the capacitor is ground through the voltage-regulating resistor which is connected in series with the capacitor so that the first output end of the low-dropout linear voltage-regulating circuit surely outputs a stable voltage, the CCDS using the low-dropout linear voltage-regulating circuit can acquire good picture effect.
Description
Technical field
The present invention relates to a kind of mu balanced circuit, relate in particular to a kind of be applied to charge-coupled image sensor (Charge CoupledDevice, CCD) low-dropout linear voltage-regulating circuit of camera (Low Drop-OUT linear regulator, LDO).
Background technology
At present, generally need to use conversion that low-dropout linear voltage-regulating circuit carries out DC voltage to be fit to the voltage that uses in the CCD camera, avoid the electric current of moment to change simultaneously CCD is impacted voltage is adjusted into CCD.
Yet, because the charge transfer speed in the CCD system is very fast, circuit load occur to change or the CCD system when switching is moved in accesss/disconnections etc., existing low-dropout linear voltage-regulating circuit is owing to reaction velocity is exported unsettled output voltage slowly, cause the CCD system can be, thereby the picture effect that the CCD system is obtained be bad at transmission charge under the unsure state.
Summary of the invention
In view of this, be necessary to provide a kind of and can export stable output voltage so that the good low-dropout linear voltage-regulating circuit of the picture effect that CCD obtains.
A kind of low-dropout linear voltage-regulating circuit, it is used to a charge-coupled image sensor system that voltage is provided.Described low-dropout linear voltage-regulating circuit comprises a low pressure difference linear voltage regulator, an electric capacity, a voltage regulation resistance and one first output terminal.Described first output terminal links to each other with described charge-coupled image sensor system.Described low pressure difference linear voltage regulator comprises one second output terminal.Described low pressure difference linear voltage regulator is used to insert a direct supply and the magnitude of voltage of described direct supply is changed to export described first output terminal to by described second output terminal.One end of described electric capacity is connected between described first output terminal and described second output terminal.The other end of described electric capacity is by described voltage regulation resistance ground connection.Described voltage regulation resistance is used to make the voltage of first output terminal output of described low-dropout linear voltage-regulating circuit to keep stable.
Compared to prior art, described low-dropout linear voltage-regulating circuit keeps stable by connect with the voltage regulation resistance voltage of first output terminal output that makes low-dropout linear voltage-regulating circuit of electric capacity, and the picture effect that guarantees to use the charge-coupled device (CCD) system of described low-dropout linear voltage-regulating circuit to be obtained is good.
Description of drawings
The circuit diagram of the low-dropout linear voltage-regulating circuit that Fig. 1 provides for embodiment of the present invention.
Fig. 2 is the variable condition figure of the load of low-dropout linear voltage-regulating circuit of Fig. 1 output current and output voltage when constant.
The variable condition figure of output current and output voltage when Fig. 3 is the load variations of low-dropout linear voltage-regulating circuit of Fig. 1.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present invention is described in further detail.
See also Fig. 1, the circuit diagram of a kind of low-dropout linear voltage-regulating circuit 10 that it provides for embodiment of the present invention.Described low-dropout linear voltage-regulating circuit 10 comprises a low pressure difference linear voltage regulator 110, capacitor C 1, a voltage regulation resistance R1 and one first an output terminal O1.The described first output terminal O1 is connected to a CCD system (figure does not show).
Described low pressure difference linear voltage regulator 110 comprises an input end S1, second an output terminal O2 and an earth terminal G1.Low pressure difference linear voltage regulator 110 inserts an external dc power by described input end S1 and also the magnitude of voltage of this direct supply is converted to a predetermined value.In the present embodiment, the magnitude of voltage of the external dc power of access is 4.3 volts (V), the output voltage V after the conversion
OutValue is 3.1 volts (V).Described earth terminal G1 ground connection.The described second output terminal O2 links to each other with an end of described capacitor C 1.
One end of capacitor C 1 is connected between the first output terminal O1 and the second output terminal O2, and the other end of capacitor C 1 links to each other with the end of voltage regulation resistance R1.The other end ground connection of voltage regulation resistance R1.In the present embodiment, the capacitance of capacitor C 1 is 10 microfarads (μ F), and the resistance value of voltage regulation resistance R1 is 0.1 ohm (Ω).
When load variations that the first output terminal O1 connects, as load on access (work) and do not close switching between (not working), this moment, electric current can instantaneous variation oscillatory occurences occur, capacitor C 1 and voltage regulation resistance R1 make the response of low-dropout linear voltage-regulating circuit 10 very fast when forming a compensating circuit with the load variations that is connected at the first output terminal O1, thereby make the voltage of the first output terminal O1 output of low-dropout linear voltage-regulating circuit 10 keep stablizing.
Fig. 2 is the variable condition figure of the low-dropout linear voltage-regulating circuit 10 of present embodiment output current and output voltage when load does not change.In the present embodiment, I
OutBe 100mA (milliampere).As can be seen from Figure 2, when load is constant, i.e. output current I
OutWhen constant, 0-t3 is in the time period, output voltage V
OutAll the time maintain a constant magnitude of voltage 3.1V.Therefore, the output voltage V of low-dropout linear voltage-regulating circuit 10
OutCan keep stability preferably when load is constant, the voltage of keeping first output terminal O1 output is stable.
Fig. 3 is the variable condition figure of the low-dropout linear voltage-regulating circuit 10 of present embodiment output current and output voltage when load variations, promptly load on insert with close between the constitutional diagram of output voltage when variation appears in electric current when doing to switch.In the present embodiment, 0-t1 is in the time period, output current I
OutBe 20mA (milliampere), at t1-t2 in the time period, output current I
OutBe 100mA (milliampere), at t2-t3 in the time period, output current I
OutBe 20mA (milliampere).As can be seen from Figure 3, when load occur to change, i.e. output current I
OutDuring variation, 0-t2 is in the time period, output voltage V
OutAll the time maintain about a constant magnitude of voltage 3.1V, in the present embodiment, output voltage V
OutError amount be 7.4mV (millivolt).Therefore, the output voltage V of low-dropout linear voltage-regulating circuit 10
OutWhen load variations, still can keep stability preferably, keep the voltage of first output terminal O1 output stable.
Described low-dropout linear voltage-regulating circuit keeps stable by connect with the voltage regulation resistance voltage of first output terminal output that makes low-dropout linear voltage-regulating circuit of electric capacity, and the picture effect that guarantees to use the CCD system of described low-dropout linear voltage-regulating circuit to be obtained is good.
In addition, those skilled in the art can also do other variation in spirit of the present invention, and certainly, the variation that these are done according to spirit of the present invention all should be included within the present invention's scope required for protection.
Claims (5)
1. low-dropout linear voltage-regulating circuit, it is used to a charge-coupled image sensor system that voltage is provided, described low-dropout linear voltage-regulating circuit comprises a low pressure difference linear voltage regulator, an electric capacity and one first output terminal, described first output terminal links to each other with described charge-coupled image sensor system, described low pressure difference linear voltage regulator comprises one second output terminal, described low pressure difference linear voltage regulator is used to insert a direct supply and the magnitude of voltage of described direct supply is changed to export described first output terminal to by described second output terminal, one end of described electric capacity is connected between first output terminal and described low pressure difference linear voltage regulator second output terminal of described low-dropout linear voltage-regulating circuit, it is characterized in that, described low-dropout linear voltage-regulating circuit also comprises a voltage regulation resistance, the other end of described electric capacity is by described voltage regulation resistance ground connection, and described voltage regulation resistance is used to make the voltage of first output terminal output of described low-dropout linear voltage-regulating circuit to keep stable.
2. low-dropout linear voltage-regulating circuit as claimed in claim 1 is characterized in that, described low pressure difference linear voltage regulator comprises an input end, and the input end of described low pressure difference linear voltage regulator is used to insert described external dc power.
3. low-dropout linear voltage-regulating circuit as claimed in claim 1 is characterized in that, described low pressure difference linear voltage regulator also comprises an earth terminal that is used for ground connection.
4. low-dropout linear voltage-regulating circuit as claimed in claim 1 is characterized in that, the capacitance of described electric capacity is 10 microfarads.
5. low-dropout linear voltage-regulating circuit as claimed in claim 1 is characterized in that, the resistance value of described voltage regulation resistance is 0.1 ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103032501A CN101923365A (en) | 2009-06-15 | 2009-06-15 | Low-dropout linear voltage-regulating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103032501A CN101923365A (en) | 2009-06-15 | 2009-06-15 | Low-dropout linear voltage-regulating circuit |
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| CN101923365A true CN101923365A (en) | 2010-12-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009103032501A Pending CN101923365A (en) | 2009-06-15 | 2009-06-15 | Low-dropout linear voltage-regulating circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103019291A (en) * | 2012-12-21 | 2013-04-03 | 上海宏力半导体制造有限公司 | Low-voltage-difference linear voltage stabilizer circuit |
| TWI662392B (en) * | 2016-12-29 | 2019-06-11 | 新唐科技股份有限公司 | Reduction of output undershoot in low-current voltage regulators |
-
2009
- 2009-06-15 CN CN2009103032501A patent/CN101923365A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103019291A (en) * | 2012-12-21 | 2013-04-03 | 上海宏力半导体制造有限公司 | Low-voltage-difference linear voltage stabilizer circuit |
| CN103019291B (en) * | 2012-12-21 | 2015-10-21 | 上海华虹宏力半导体制造有限公司 | Low differential voltage linear voltage stabilizer circuit |
| TWI662392B (en) * | 2016-12-29 | 2019-06-11 | 新唐科技股份有限公司 | Reduction of output undershoot in low-current voltage regulators |
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Application publication date: 20101222 |