CN101123396B - Circuit for multi-function pin via pulse width adjusting controller - Google Patents
Circuit for multi-function pin via pulse width adjusting controller Download PDFInfo
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- CN101123396B CN101123396B CN2006101121032A CN200610112103A CN101123396B CN 101123396 B CN101123396 B CN 101123396B CN 2006101121032 A CN2006101121032 A CN 2006101121032A CN 200610112103 A CN200610112103 A CN 200610112103A CN 101123396 B CN101123396 B CN 101123396B
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Abstract
The invention relates to a circuit to achieve multifunction pins in a pulse width modulation control. The pulse width modulation control is used to switch a high position switch module connected between an input voltage and a phase node, and a low position switch module connected between the phase node and a grounding potential. The circuit comprises a multifunction connection pin, an enabling device, a pulse width modulation control circuit, an external power supply detector and an overcurrent protective device. The multifunction connection pin is connected with the phase node. The enabling device, the pulse width modulation control circuit, the external power supply detector and the overcurrent protective device is used to detect the voltage of the multifunction pin to enable to start up the pulse width modulation control, detect whether to start up the input voltage and detect over-large current output.
Description
Technical field
The invention relates to the technology of pulse-width modulation, refer to a kind of circuit of in PWM controller, realizing multi-function pin especially.
Background technology
Fig. 1 is an existing electric pressure converter 20, wherein PWM controller 22 is switched the transistor 24 and 28 of pair of series between input voltage vin and earthing potential GND, pass through phase node 26 with conducting one output current I, controller 22 has a multi-function pin PH and is connected to phase node 26 through resistance R s, a transistor 29 is connected between multi-function pin PH and the earthing potential GND in addition, is controlled by enable signal Ve.In controller 22, duplicate supply transducer 221 is formed a power supply sensing apparatus with comparator 222, and comparator 223 is formed overcurrent protective device with current source 224, and transistor 29 is formed an activation device with comparator 225.In the activation device, the non-inverting input of comparator 225 is connected to multi-function pin PH, its inverting input then connects voltage Ven, when starting resistor transducer 20, enable signal Ve closes transistor 29, at this moment, if the voltage on the multi-function pin PH is higher than voltage Ven, comparator 225 outputs one signal ENI activation PWM controller 22.After controller 22 is enabled, output voltage V out still is zero, and driver 226 and 227 no signal input still, duplicate supply transducer 221 this moment sensing power source voltage Vcc 1 on the one hand, export a confirmation signal pre-check to driver 226 on the one hand, with turn-on transistor 24, at this moment comparator 222 voltage and the reference voltage Vinpor on the multi-function pin PH relatively, if the voltage on the multi-function pin PH is higher than reference voltage Vinpor, the expression input voltage vin starts, comparator 222 output signal PORE are to duplicate supply transducer 221, when duplicate supply transducer 221 senses power source voltage Vcc 1 when also being activated, output signal POR makes pulse width modulating control circuit 228 produce signal Vc1 and Vc2, seeing through driver 226 and 227 switching transistors 24 and 28 respectively, and produce output current I.Yet in existing electric pressure converter 20, need increase a pair of power sensor 221, this not only increases the cost of electric pressure converter 20 integrated circuits, also because this duplicate supply transducer 221 is an analog circuit, the mortality when more increasing the integrated circuit volume production of electric pressure converter 20.So existing electric pressure converter still has many disappearances and necessity of being improved is arranged.
Summary of the invention
A purpose of the present invention is providing a kind of circuit of realizing multi-function pin in PWM controller, so that reduce the component count of PWM controller, to reduce the cost of PWM controller.
Another object of the present invention is providing a kind of circuit of realizing multi-function pin in PWM controller, so that reduce the component count of PWM controller, and the success rate during with increase electric pressure converter volume production.
A further object of the present invention is providing a kind of circuit of realizing multi-function pin in PWM controller, so that reduce the pin number, to reduce the cost of voltage transitions tolerance.
According to a characteristic of the present invention; the present invention proposes a kind of circuit of realizing multi-function pin in PWM controller; this PWM controller is connected high-order side switch module and between an input voltage and the phase node and is connected low level side switch module between this phase node and the earthing potential in order to switch one, and this circuit comprises a multifunctional pins, an activation device, a pulse width modulating control circuit, an external power source detector and an overcurrent protective device.This multifunctional pins connects this phase node; This activation device is connected to this multifunctional pins, in order to detect the voltage on this multifunctional pins, so that this PWM controller of activation; After this PWM controller was enabled, this pulse width modulating control circuit was exported a pulse-width modulation signal, should high position side switch module with conducting; Whether this external power source detector is connected to this multifunctional pins, in order to detect the voltage on this multifunctional pins, start so that judge this input voltage; This overcurrent protective device is connected to this multifunctional pins, in order to detect the voltage on this multifunctional pins, so that prevent to produce excessive output current.
Description of drawings
Fig. 1 is the calcspar of an existing electric pressure converter;
Fig. 2 is a calcspar of realizing the circuit of multi-function pin in PWM controller of the present invention;
Fig. 3 is the schematic diagram of signal waveform of the present invention.
[primary clustering symbol description]
Electric pressure converter 20 PWM controller 22
Transistor 24,28 phase nodes 26
Transistor 29 duplicate supply transducers 221
Comparator 222 comparators 223
Current source 224 comparators 225
Drive 226,227
Duplicate supply sensing 221
Pulse width modulating control circuit 228
Low level side switch module 303 activation switches 304
The 3rd comparator 320 pulse width modulating control circuits 330
Error amplifier 331 compensating circuits 332
First comparator, 333 external power source detectors 340
Second comparator, 341 overcurrent protective devices 350
Driver 360,370
Embodiment
Fig. 2 is a calcspar of realizing the circuit of multi-function pin in PWM controller 300 of the present invention.This PWM controller 300 is connected high-order side switch module 302 and between an input voltage VIN 2 and the phase node 301 and is connected low level side switch module 303 between this phase node 301 and the earthing potential in order to switch one.
One multifunctional pins 310 sees through resistance R and connects this phase node 301.One activation switch 304 and one the 3rd comparator 320 are formed an activation device.This activation device is in order to detect the voltage on this multifunctional pins 310, so that this pulse width modulating control circuit 330 of activation.
This pulse width modulating control circuit 330 comprises an error amplifier 331, a compensating circuit 332, reaches one first comparator 333.The non-inverting input of error amplifier 331 is connected to the back coupling input FB that the first reference voltage VREF inverting input then is connected to pulse width modulating control circuit 330.Compensating circuit 332 is connected to the usefulness of the output of this error amplifier 331 as the compensation of pulse width modulating control circuit 330, so that produce an error output voltage ERR_OUT.The reverse input end that the non-inverting input of first comparator 333 is connected to these compensating circuit 332, the first comparators 333 receives a triangular signal TRI-OSC.This first comparator 333 is this error output voltage ERR_OUT and this triangular signal TRI-OSC relatively, so that produce this pulse-width modulation signal PWM_OUT.After this PWM controller 300 was enabled, these pulse width modulating control circuit 330 outputs one pulse-width modulation signal PWM_OUT was with conducting one high-order side switch module 302.
Whether external power source detector 340 is connected to this multifunctional pins 310, in order to detect the voltage on this multifunctional pins 310, start so that judge this input voltage VIN 2.External power source detector 340 is made up of one second comparator 341.The reverse input end that the non-inverting input of second comparator 341 is connected to these multifunctional pins 310, the second comparators 341 is connected to one second reference voltage VIN2REF.Second comparator 341 is the voltage on this second reference voltage VIN2REF and this multifunctional pins 310 relatively, so that produce an index signal VIN2OK, wherein, whether this index signal VIN2OK starts in order to indicate this input voltage VIN 2.
Overcurrent protective device 350 is connected to this multifunctional pins 310, in order to detect the voltage on this multifunctional pins 310, so that prevent to produce excessive output current.Overcurrent protective device 350 comprises a current source 351, reaches one the 4th comparator 352.Current source 351 is connected to this multifunctional pins 310, to produce the voltage of a detection of excessive current at this multifunctional pins 310.The non-inverting input that the reverse input end of the 4th comparator 352 is connected to these multifunctional pins 310, the four comparators 352 is connected to one the 4th reference voltage VOC.The 4th comparator 352 is the voltage of the detection of excessive current on the 4th reference voltage VOC and this multifunctional pins 310 relatively, so that produce an overcurrent signal OC, to prevent to export excessive electric current.
When PWM controller 300 make high-order side switch module 302 by and during 303 conductings of low level side switch module, the voltage of phase node 301 can equal-IL*rd, wherein, the resistance value when rd is 303 conductings of low level side switch module.When the IL electrorheological was big, then the voltage of phase node 301 was also low more, and the voltage of multifunctional pins 310 also can be along with reduction relatively.When the voltage of multifunctional pins 310 was lower than VOC voltage, IL was excessive in expression, the overcurrent signal OC of the 4th comparator 352 outputs output high potential.
Fig. 3 is the schematic diagram of signal waveform of the present invention.When the second enable signal EN was high potential, the soft-start signal SS of error amplifier 331 was when slowly rising, and the error output voltage ERR_OUT of error amplifier 331 can rise and rise along with soft-start signal SS.So as shown in Figure 3, error output voltage ERR_OUT rises gradually.At A point place, error output voltage ERR_OUT is greater than triangular signal TRI-OSC, so first comparator, 333 output pulse width modulating signal PWM_OUT.When pulse-width modulation signal PWM_OUT is output as high potential, sees through driver 360 and make the UGATE pin also can export high potential, and cause high-order side switch module 302 conductings.This makes the voltage of multifunctional pins 310 can equal VIN2+ (IB*R).If the voltage of multifunctional pins 310 is higher than the second reference voltage VIN2REF of external power source detector 340, oneself starts expression VIN2 voltage.When oneself started when VIN2 voltage, 330 of this pulse width modulating control circuits can continue output pulse width modulating signal PWM_OUT or will restart pulse width modulating control circuit 330 again after the soft-start signal SS discharge.Otherwise then duplicate detection or certain interval of time duplicate detection are up to the VIN2 voltage starting.External power source detector 340 of the present invention has reduced the action of pre-check compared to the duplicate supply transducer 221 of prior art.
As shown in the above description, the technology of the present invention is used the existing pulse width modulating control circuit 330 of PWM controller (PWM) 300, to replace existing duplicate supply transducer 221, can reduce the component count of PWM controller (PWM) 300, and reduce the cost of PWM controller.Again, the technology of the present invention need not to use the duplicate supply transducer 221 of analog circuit, the success rate in the time of can increasing the electric pressure converter volume production.Simultaneously, the technology of the present invention can reduce the pin number, to reduce the cost of voltage transitions tolerance.
The foregoing description only is to give an example for convenience of description, and the interest field that the present invention advocated should be as the criterion so that claim is described certainly, but not only limits to the foregoing description.
Claims (4)
1. circuit of in PWM controller, realizing multi-function pin, this PWM controller is connected high-order side switch module and between an input voltage and the phase node and is connected low level side switch module between this phase node and the earthing potential in order to switch one, it is characterized in that this circuit comprises:
One multifunctional pins, it connects this phase node;
One activation device is connected to this multifunctional pins, in order to detect the voltage on this multifunctional pins, so that this PWM controller of activation; This activation device comprises: an activation switch, and it is connected between this multifunctional pins and this earthing potential, is controlled by one first enable signal; And one the 3rd comparator, its input is connected to this multifunctional pins and one the 3rd reference voltage, and the 3rd comparator is the voltage on the 3rd reference voltage and this multifunctional pins relatively, so that produce one second enable signal to start this PWM controller;
One pulse width modulating control circuit, after this PWM controller was enabled, this pulse width modulating control circuit was exported a pulse-width modulation signal, should high position side switch module with conducting;
Whether one external power source detector is connected to this multifunctional pins, in order to detect the voltage on this multifunctional pins, start so that judge this input voltage; And
One overcurrent protective device is connected to this multifunctional pins, in order to detect the voltage on this multifunctional pins, so that prevent to produce excessive output current.
2. circuit as claimed in claim 1 is characterized in that, described this pulse width modulating control circuit comprises:
One error amplifier, the voltage difference of amplifying a back coupling input of one first reference voltage and this pulse width modulating control circuit;
One compensating circuit is connected to the output of this error amplifier, as the usefulness of the compensation of this pulse width modulating control circuit, so that produce an error output voltage; And
One first comparator, its non-inverting input is connected to this compensating circuit, and its reverse input end receives a triangular signal, and this first comparator is this error output voltage and this triangular signal relatively, so that produce this pulse-width modulation signal.
3. circuit as claimed in claim 1 is characterized in that, described this external power source detector comprises:
One second comparator, its non-inverting input is connected to this multifunctional pins, and its reverse input end is connected to one second reference voltage, and this second comparator is the voltage on this second reference voltage and this multifunctional pins relatively, so that produce an index signal;
Wherein, whether this index signal starts in order to indicate this input voltage.
4. circuit as claimed in claim 1 is characterized in that, described this overcurrent protective device comprises:
One current source is connected to this multifunctional pins, to produce the voltage of a detection of excessive current at this multifunctional pins; And
One the 4th comparator, its reverse input end is connected to this multifunctional pins, its non-inverting input is connected to one the 4th reference voltage, the 4th comparator is the voltage of the detection of excessive current on the 4th reference voltage and this multifunctional pins relatively, so that produce an overcurrent signal, to prevent to export excessive electric current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101121032A CN101123396B (en) | 2006-08-09 | 2006-08-09 | Circuit for multi-function pin via pulse width adjusting controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101121032A CN101123396B (en) | 2006-08-09 | 2006-08-09 | Circuit for multi-function pin via pulse width adjusting controller |
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| Publication Number | Publication Date |
|---|---|
| CN101123396A CN101123396A (en) | 2008-02-13 |
| CN101123396B true CN101123396B (en) | 2010-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2006101121032A Expired - Fee Related CN101123396B (en) | 2006-08-09 | 2006-08-09 | Circuit for multi-function pin via pulse width adjusting controller |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103401429B (en) * | 2013-08-09 | 2015-08-26 | 杭州茂力半导体技术有限公司 | A kind of Switching Power Supply and control circuit thereof and control method |
| US11949333B2 (en) * | 2021-12-29 | 2024-04-02 | Texas Instruments Incorporated | Peak current limit management for high frequency buck converter |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5502610A (en) * | 1993-09-02 | 1996-03-26 | Micrel, Inc. | Switching regulator having high current prevention features |
| CN1578082A (en) * | 2003-07-28 | 2005-02-09 | 松下电器产业株式会社 | Semiconductor device |
| CN1812235A (en) * | 2005-01-26 | 2006-08-02 | 株式会社瑞萨科技 | Electronic component for power supply and a power supply device |
-
2006
- 2006-08-09 CN CN2006101121032A patent/CN101123396B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5502610A (en) * | 1993-09-02 | 1996-03-26 | Micrel, Inc. | Switching regulator having high current prevention features |
| CN1578082A (en) * | 2003-07-28 | 2005-02-09 | 松下电器产业株式会社 | Semiconductor device |
| CN1812235A (en) * | 2005-01-26 | 2006-08-02 | 株式会社瑞萨科技 | Electronic component for power supply and a power supply device |
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| Publication number | Publication date |
|---|---|
| CN101123396A (en) | 2008-02-13 |
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