CN101436082B - Low voltage drop linear voltage-stabilizing apparatus - Google Patents

Low voltage drop linear voltage-stabilizing apparatus Download PDF

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Publication number
CN101436082B
CN101436082B CN2007102025342A CN200710202534A CN101436082B CN 101436082 B CN101436082 B CN 101436082B CN 2007102025342 A CN2007102025342 A CN 2007102025342A CN 200710202534 A CN200710202534 A CN 200710202534A CN 101436082 B CN101436082 B CN 101436082B
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China
Prior art keywords
voltage
low
module
output
steering logic
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CN2007102025342A
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Chinese (zh)
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CN101436082A (en
Inventor
王辉
侯震
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佛山普立华科技有限公司
鸿海精密工业股份有限公司
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Priority to CN2007102025342A priority Critical patent/CN101436082B/en
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Abstract

The invention relates to a low-dropout linear voltage stabilizing device, which comprises a low-dropout linear regulator and a voltage sampling module, wherein the low-dropout linear regulator is provided with an enabling control module which can output a second control logic; the voltage sampling module samples the output voltage of the low-dropout linear regulator and outputs a first control logic; and the first control logic and the second control logic form a third control logic. The low-dropout linear voltage stabilizing device controls the output state of the low-dropout linear regulator through the third control logic and avoids that the output state of the low-dropout linear regulator is in the failure mode caused by the fact that the enabling control module is in the floating state.

Description

Low voltage drop linear voltage-stabilizing apparatus

Technical field

The present invention relates to a kind of stable-pressure device, relate in particular to a kind of low voltage drop linear voltage-stabilizing apparatus.

Background technology

Low-voltage-drop linear voltage regulator (Low Drop-out Linear Regulator; LDO) be widely used in the multiple consumer electronics products such as mobile phone, DVD, digital camera and Mp3 the voltage stabilizing chip, in order to satisfy the requirement of these precise electronic products, input end at power supply adds linear voltage regulator, to guarantee that supply voltage is constant and to realize active noise filtering.In addition, these electronic products have only Battery pack power supply usually, in order to save the electric weight for battery, wish that LDO works in sleep state when equipment is not worked.For this reason, most of LDO has the control function of enabling, thereby makes things convenient for the user to control use.

But, this LDO is in convenient the use, exist the logic working level that makes energy control module of unavoidable problem a: LDO to have no idea to cover a continuous operation level, thereby cause when control signal is in this discontinuous operation level, make energy control module be in quick condition (a uncontrollable stage between high level H and low level L), thereby LDO lose the control to output state.

Summary of the invention

In view of this, be necessary to provide a kind of low-voltage-drop linear voltage regulator that solves to lose low voltage drop linear voltage-stabilizing apparatus to the control problem of output state.

A kind of low voltage drop linear voltage-stabilizing apparatus, it comprises a low-voltage-drop linear voltage regulator and a voltage sample module, this low-voltage-drop linear voltage regulator has the energy control module that makes that can export second steering logic, this voltage sample module is sampled to the output voltage of this low-voltage-drop linear voltage regulator, and export first steering logic, this first steering logic and this second steering logic constitute the 3rd steering logic, and this first steering logic, this second steering logic and the 3rd steering logic satisfy following logical relation: Wherein, Y 1Be this first steering logic; Y 2Be this second steering logic; Y is the 3rd steering logic.

Described low voltage drop linear voltage-stabilizing apparatus, control the output state of this low-voltage-drop linear voltage regulator by the 3rd steering logic, avoided causing the output state of this low-voltage-drop linear voltage regulator to be in failure mode because of this makes energy control module be in quick condition.

Description of drawings

The functional structure chart of the low voltage drop linear voltage-stabilizing apparatus that Fig. 1 provides for first embodiment of the invention.

The output voltage and the time relation curve map of linear voltage regulator falls in Fig. 2 for Fig. 1 mesolow.

Fig. 3 is the synoptic diagram that concerns of the logic level of sampled voltage among Fig. 2 and output voltage.

The functional structure chart of the low voltage drop linear voltage-stabilizing apparatus that Fig. 4 provides for second embodiment of the invention.

Embodiment

Below in conjunction with accompanying drawing embodiment of the present invention is described in further detail.

See also Fig. 1, be a kind of low voltage drop linear voltage-stabilizing apparatus 100 that first embodiment of the invention provides, this low voltage drop linear voltage-stabilizing apparatus 100 comprises a low-voltage-drop linear voltage regulator 101 and a voltage sample module 102.This low-voltage-drop linear voltage regulator 101 comprises that one makes energy control module 1011, MOS driver module 1012, MOS switch module 1013, the 4th comparison amplifier 1014 and feedback module 1015.This voltage sample module 102 includes a logic module output 1024, a comparison amplifier module 1025 and a Postponement module 1026, and this comparison amplifier module 1025 has first comparison amplifier 10251 and second comparison amplifier 10252.

This low-voltage-drop linear voltage regulator 101 receives external input voltage V In, through the inter-process output voltage V Out, to guarantee that supply voltage is constant and to realize active noise filtering.The output voltage V of 102 pairs of these low-voltage-drop linear voltage regulators 101 of this voltage sample module OutCarry out time sharing sampling, obtain the first sampled voltage V 1With the second sampled voltage V 2, and judge this double sampling voltage V 1, V 2Logic level, obtain the first sampled voltage V 1Logic level A 1With the second sampled voltage V 2Logic level A 2, last, with A 1With A 2Constitute one first steering logic Y 1

The output that makes energy control module 1011 of this low voltage drop linear voltage-stabilizing apparatus 100 has a reference voltage V RefWith one second steering logic Y 2The output voltage V of 1015 pairs of these low-voltage-drop linear voltage regulators 101 of this feedback module OutCarry out real-time sampling, and send into the 4th comparison amplifier 1014, this first comparison amplifier 10251 and this Postponement module 1026 respectively.The 4th comparison amplifier 1014 receives output signal and this reference voltage V of this feedback module 1015 Ref, and the output after these two signals are compared and enlarged is used for driving this MOS driver module 1012.This first comparison amplifier 10251 is at first moment t 1Receive the output signal of this feedback module 1015, obtain the first sampled voltage V 1This first comparison amplifier 10251 is with this first sampled voltage V 1With this reference voltage V RefConstitute the first logic level A 1This second comparison amplifier 10252 is because the existence of this Postponement module 1026, so, at second t constantly 2Receive the output signal of this feedback module 1015, obtain the second sampled voltage V 2This second comparison amplifier 10252 is with this second sampled voltage V 2With this reference voltage V RefConstitute the second logic level A 2This logic module output 1024 receives these two logic level A 1, A 2, and constitute this first steering logic Y 1This MOS driver module 1012 receives output signal, this second steering logic Y of the 4th comparison amplifier module 1014 2And this first steering logic Y 1, and with this second steering logic Y 2With this first steering logic Y 1Constitute the 3rd steering logic Y.This MOS switch module 1013 receives the external input voltage V of this low-voltage-drop linear voltage regulator 101 InWith the 3rd steering logic Y, be used for controlling the output voltage V of this low-voltage-drop linear voltage regulator 101 Out

See also Fig. 2, fall the output voltage V of linear voltage regulator 101 for Fig. 1 mesolow OutGraph of relation with time t.The output voltage V of this low-voltage-drop linear voltage regulator 101 OutWith the relation curve of time t be L 1, this voltage sample module 102 is at t 1, t 2Constantly to output voltage V OutSampled voltage be respectively V 1, V 2

See also Fig. 3, be sampled voltage V among Fig. 2 1, V 2Corresponding logic level A 1, A 2With output voltage V OutConcern synoptic diagram.t 1With t 2Between the time interval be T, in the present embodiment, t 1With t 2Between time interval T greater than the soft-start time of this low-voltage-drop linear voltage regulator 101, cause misoperation to avoid load to change suddenly.By judging V 1, V 2Corresponding logic level A 1, A 2, obtain this first steering logic Y 1, its logical relation is converted into truth table can be by shown in the following table 1.

Table 1

Input Input Output ??A 1 ??A 2 ??Y 1 ??0 ??0 ??0 ??0 ??1 ??1 ??1 ??0 ??0 ??1 ??1 ??0

Last table 1 can be represented by following logical relation: Y1=A 1* A 2

The second steering logic Y that makes energy control module 1011 of this low-voltage-drop linear voltage regulator 101 2With this first steering logic Y 1, constituting the 3rd steering logic Y, its logical relation is converted into truth table can be by shown in the following table 2.

Table 2

Input Input Output ??Y 1 ??Y 2 ??Y ??0 ??0 ??0 ??0 ??1 ??1 ??1 ??0 ??1 ??1 ??1 ??1

Last table 2 can be represented by following logical relation: Y=Y 1* Y 2+ Y 1

Because Y 1By this V 1, V 2Corresponding logic level A 1, A 2Logical relation constitute, so, this A 1, A 2With this second steering logic Y 2, the 3rd steering logic Y logical relation be converted into truth table can be by shown in the following table 3.

Table 3

Last table 3 can be represented by following logical relation: Y=(A 1+ A 2) * Y 2+ A 1* A 2

See also Fig. 4, be a kind of low voltage drop linear voltage-stabilizing apparatus 200 that second embodiment of the invention provides, this low voltage drop linear voltage-stabilizing apparatus 200 comprises a low-voltage-drop linear voltage regulator 101 and a voltage sample module 103.The difference of this second embodiment and this first embodiment is, the output voltage V of 103 pairs of these low-voltage-drop linear voltage regulators 101 of this voltage sample module OutCarry out real-time sampling, this voltage sample module 103 includes one the 3rd comparison amplifier 10253, and this voltage sample module 103 receives an external reference voltage V ' RefThis external reference voltage V ' RefDemand according to the user is provided with, because this external reference voltage V ' RefDetermined the output voltage of this low-voltage-drop linear voltage regulator 101, so this external reference voltage V ' RefMake the reference voltage V of energy control module 1011 less than this RefThe 3rd comparison amplifier 10253 is at t 3Constantly, receive the output signal of this feedback module 1015, obtain the 3rd output voltage V 3The 3rd comparison amplifier 10253 is with the 3rd output voltage V 3With this external reference voltage V ' RefConstitute this first steering logic Y 1

In sum in first, second embodiment, as the logic output Y of this voltage sample module 102 1During for high level H, no matter this makes the logic output Y of energy control module 1011 2Be in what state, total logic output Y closes this MOS switch module 1013; Work as Y 1During for low level L, Y 2During for high level H, this MOS switch module 1013 is also closed Y 2During for low level L, this MOS switch module 1013 is not done control.Like this, occur because of this makes energy control module 1011 be in the problem that output state that quick condition makes this low-voltage-drop linear voltage regulator 101 is in failure mode with regard to avoiding.

Though the present invention discloses as above with better embodiment,, it is not in order to qualification the present invention, and in addition, those skilled in the art can also do other variation etc. in spirit of the present invention.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 (6)

1. low voltage drop linear voltage-stabilizing apparatus, it comprises:
A low-voltage-drop linear voltage regulator, this low-voltage-drop linear voltage regulator have the energy control module that makes that can export second steering logic;
It is characterized in that, this low voltage drop linear voltage-stabilizing apparatus further comprises a voltage sample module, this voltage sample module is sampled to the output voltage of this low-voltage-drop linear voltage regulator, and export first steering logic, this first steering logic and this second steering logic constitute the 3rd steering logic, the 3rd steering logic is used to control the output of this low-voltage-drop linear voltage regulator, and this first steering logic, this second steering logic and the 3rd steering logic satisfy following logical relation: Wherein, Y 1Be this first steering logic; Y 2Be this second steering logic; Y is the 3rd steering logic.
2. low voltage drop linear voltage-stabilizing apparatus as claimed in claim 1, it is characterized in that, this makes the output of energy control module also have a reference voltage, this voltage sample module has a logic module output, a comparison amplifier module and a Postponement module, this voltage sample module is carried out time sharing sampling by this Postponement module to the output voltage of this low-voltage-drop linear voltage regulator, obtain first output voltage and second output voltage, this comparison amplifier module has first comparison amplifier and second comparison amplifier, this first comparison amplifier receives this first output voltage and this makes the reference voltage of energy control module, and constitute first logic level, this second comparison amplifier receives this second output voltage and this makes the reference voltage of energy control module, and constituting second logic level, this logic module output constitutes this first steering logic with first logic level and second logic level.
3. low voltage drop linear voltage-stabilizing apparatus as claimed in claim 1, it is characterized in that, this makes the output of energy control module also have a reference voltage, this voltage sample module has a comparison amplifier, and this voltage sample module receives an external reference voltage, and the output voltage of this low-voltage-drop linear voltage regulator carried out real-time sampling, this comparison amplifier receives output voltage and this external reference voltage after the sampling, and constitutes this first steering logic.
4. low voltage drop linear voltage-stabilizing apparatus as claimed in claim 2 is characterized in that the time delay of this Postponement module is greater than the soft-start time of this low-voltage-drop linear voltage regulator.
5. low voltage drop linear voltage-stabilizing apparatus as claimed in claim 2 is characterized in that, this first logic level, this second logic level and this first steering logic satisfy following logical relation:
Wherein, Y 1Be this first steering logic;
A 1Be this first logic level;
A 2Be this second logic level.
6. low voltage drop linear voltage-stabilizing apparatus as claimed in claim 3 is characterized in that this external reference voltage is provided with according to user's demand, and makes the reference voltage of energy control module less than this.
CN2007102025342A 2007-11-14 2007-11-14 Low voltage drop linear voltage-stabilizing apparatus CN101436082B (en)

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Application Number Priority Date Filing Date Title
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CN101436082B true CN101436082B (en) 2010-11-17

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Publication number Priority date Publication date Assignee Title
CN103713679B (en) * 2013-12-17 2016-04-13 深圳市新国都技术股份有限公司 A kind of LDO circuit based on discrete component

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1112250A (en) * 1994-01-10 1995-11-22 莫托罗拉公司 Voltage regulator and method therefor
CN1760782A (en) * 2004-10-13 2006-04-19 鸿富锦精密工业(深圳)有限公司 DC linear stabilizeld voltage power supply for main board
US7265606B1 (en) * 2004-09-02 2007-09-04 National Semiconductor Corporation Apparatus and method for a boot strap circuit for a boost voltage converter
CN101051233A (en) * 2006-04-05 2007-10-10 通嘉科技股份有限公司 Voltage regulating circuit and voltage regulating method for preventing input voltage sudden fall

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1112250A (en) * 1994-01-10 1995-11-22 莫托罗拉公司 Voltage regulator and method therefor
US7265606B1 (en) * 2004-09-02 2007-09-04 National Semiconductor Corporation Apparatus and method for a boot strap circuit for a boost voltage converter
CN1760782A (en) * 2004-10-13 2006-04-19 鸿富锦精密工业(深圳)有限公司 DC linear stabilizeld voltage power supply for main board
CN101051233A (en) * 2006-04-05 2007-10-10 通嘉科技股份有限公司 Voltage regulating circuit and voltage regulating method for preventing input voltage sudden fall

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