CN105099166A - Method for improving power-on stability of multiplexing enabled pin and chip - Google Patents
Method for improving power-on stability of multiplexing enabled pin and chip Download PDFInfo
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- CN105099166A CN105099166A CN201410202619.0A CN201410202619A CN105099166A CN 105099166 A CN105099166 A CN 105099166A CN 201410202619 A CN201410202619 A CN 201410202619A CN 105099166 A CN105099166 A CN 105099166A
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Abstract
The invention discloses a method for improving power-on stability of a multiplexing enabled pin. The method comprises a step S1 of adding a filter circuit between a DC voltage positive input and an enabled/multiplexing pin of a DC-DC chip; and a step S2 of the filter circuit filtering interference signals in the inputted DC voltage in the power-on process, so as to prevent the enabled pin from entry into a multiplexing function due to the interference signals in the DC voltage. The DC-DC chip comprises the filter circuit, and the DC voltage positive input is connected with the enabled/multiplexing pin through the filter circuit. The filter circuit is an RC filter circuit, the DC voltage positive input is connected with the enabled/multiplexing pin through a resistor R, and a common connecting end of the resistor R with the enabled/multiplexing pin is further grounded through a capacitor C. The invention improves an enabled pin circuit, a high level, which is directly connected originally, is now connected through the RC filter circuit, in this way, the interference signals of the inputted DC voltage are effectively filtered by the RC filter circuit in the power-on process, the DC-DC chip is ensured not to mistakenly enter the multiplexing function, and the power-on stability of the DC-DC chip is enhanced.
Description
Technical field
The present invention relates to device power supply (DPS) field, particularly relate to a kind of method and the chip that improve electrical stability on multiplexing enable pin.
Background technology
Dc-dc is the electric pressure converter effectively exporting fixed voltage after changing input voltage, and dc-dc can be divided three classes: booster type dc-dc, buck mode DC-DC converter and buck-boost type dc-dc.Three classes can be adopted according to demand to control: PWM control type efficiency is high and have good output voltage ripple and noise.Even if PFM control type uses for a long time, especially there is during little load the little advantage of power consumption.Carry out PFM during the little load of PWM/PFM conversion hysteria to control, and be automatically transformed into PWM when heavy duty and control.Current dc-dc is widely used in the products such as mobile phone, MP3, digital camera, portable electronic device.
DC-DC conversion chip is provided with enable pin, and enable pin is the lead-out wire making chip enter operating state, and it is effective that the enable pin of general DC-DC chip connects high level.For reducing chip pin quantity, some chips pin can be configured to multiple function, and as other function pins of enable pin reusable, such pin is called as complexing pin.So-called multiplexing function is exactly complexing pin other functions except ena-bung function.
As shown in Figure 1, the DC-DC chip of multiplexing enable pin is not when needing enable pin multiplexing, and chip production producer generally recommends directly to be received on input direct voltage positive pole by enable pin.But problem has occurred: even if the DC-DC chip enable pin of some multiplexing enable pin receives high level, in power up, DC-DC chip enable pin still can enter multiplexing function, thus causes DC-DC chip cisco unity malfunction.Cause the reason of this problem to be exactly there is interference signal in input direct voltage, directly receive on input direct voltage positive pole by DC-DC chip enable pin, in power up, interference signal can make enable pin be strayed into multiplexing function.The enable pin of the DC-DC chip of existing multiplexing enable pin is all directly received on input direct voltage positive pole, the interference signal that cannot exist in filtering input direct voltage.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of method and the chip that improve electrical stability on multiplexing enable pin are provided, RC filter circuit can interference signal on the enable pin that effectively filtering is multiplexing, the interference signal avoiding input dc power in power up to press makes enable pin be strayed into multiplexing function, improves electrical stability on DC-DC chip.
The object of the invention is to be achieved through the following technical solutions: a kind of method improving electrical stability on multiplexing enable pin, it comprises the following steps:
S1: add a filter circuit between DC voltage electrode input and DC-DC chip enable/complexing pin;
S2: in power up, the filtered circuit filtering of the interference signal in the direct voltage of input, avoids the interference signal in direct voltage to make enable pin be strayed into multiplexing function.
Improve a chip for electrical stability on multiplexing enable pin, comprise enable/complexing pin, enable/complexing pin connects DC voltage electrode input, also comprises filter circuit, and DC voltage electrode input connects enable/complexing pin by filter circuit.
Described filter circuit is RC filter circuit, is made up of resistance R and electric capacity C, and DC voltage electrode input is connected with enable/complexing pin by resistance R, and the public connecting end of resistance R and enable/complexing pin is also by electric capacity C ground connection.
The invention has the beneficial effects as follows:
1) enable pin circuit is improved, change into through RC filter circuit by originally directly connecing high level, the interference signal that in such power up, input dc power presses, by the effective filtering of RC filter circuit, is guaranteed that DC-DC chip can not enter multiplexing function by mistake, is improve electrical stability on DC-DC chip;
2) because DC-DC circuit application is in the circuit board very extensive, the cisco unity malfunction if DC-DC circuit powers on, then directly can affect the normal power supply of Circuits System, the problem therefore solving electrical stability in DC-DC circuit has positive meaning to improving containing the stability of enable pin multiplexing DC-DC circuit product and robustness.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that in prior art, enable pin directly connects high level;
Fig. 2 is the schematic diagram that enable pin of the present invention connects RC filter circuit.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail, but protection scope of the present invention is not limited to the following stated.
Improve a method for electrical stability on multiplexing enable pin, it comprises the following steps:
S1: add a filter circuit between DC voltage electrode input and DC-DC chip enable/complexing pin;
S2: in power up, the filtered circuit filtering of the interference signal in the direct voltage of input, avoids the interference signal in direct voltage to make enable pin be strayed into multiplexing function.
As shown in Figure 2, improve a chip for electrical stability on multiplexing enable pin, comprise enable/complexing pin, enable/complexing pin connects DC voltage electrode input, also comprise filter circuit, DC voltage electrode input connects enable/complexing pin by filter circuit.
Because the direct voltage of input often exists interference signal, directly DC-DC chip enable pin is received on input direct voltage positive pole, the interference signal that in power up, input dc power presses may make enable pin be strayed into multiplexing function, thus causes DC-DC chip cisco unity malfunction.And after enable pin sets up filter circuit, can the interference signal that exist in the direct voltage of effective filtering input, guarantee that DC-DC chip can not enter multiplexing function by mistake, improve DC-DC chip stability.
As a further improvement on the present invention, described filter circuit is RC filter circuit, be made up of resistance R and electric capacity C, DC voltage electrode input is connected with enable/complexing pin by resistance R, and the public connecting end of resistance R and enable/complexing pin is also by electric capacity C ground connection.
The above is only the preferred embodiment of the present invention, be to be understood that the present invention is not limited to the form disclosed by this paper, should not regard the eliminating to other embodiments as, and can be used for other combinations various, amendment and environment, and can in contemplated scope described herein, changed by the technology of above-mentioned instruction or association area or knowledge.And the change that those skilled in the art carry out and change do not depart from the spirit and scope of the present invention, then all should in the protection range of claims of the present invention.
Claims (3)
1. improve a method for electrical stability on multiplexing enable pin, it is characterized in that: it comprises the following steps:
S1: add a filter circuit between DC voltage electrode input and DC-DC chip enable/complexing pin;
S2: in power up, the filtered circuit filtering of the interference signal in the direct voltage of input, avoids the interference signal in direct voltage to make enable pin be strayed into multiplexing function.
2. one kind is improved the chip of electrical stability on multiplexing enable pin, comprise enable/complexing pin, enable/complexing pin connects DC voltage electrode input, it is characterized in that: also comprise filter circuit, and DC voltage electrode input connects enable/complexing pin by filter circuit.
3. a kind of chip improving electrical stability on multiplexing enable pin according to claim 2, it is characterized in that: described filter circuit is RC filter circuit, be made up of resistance R and electric capacity C, DC voltage electrode input is connected with enable/complexing pin by resistance R, and the public connecting end of resistance R and enable/complexing pin is also by electric capacity C ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410202619.0A CN105099166A (en) | 2014-05-14 | 2014-05-14 | Method for improving power-on stability of multiplexing enabled pin and chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410202619.0A CN105099166A (en) | 2014-05-14 | 2014-05-14 | Method for improving power-on stability of multiplexing enabled pin and chip |
Publications (1)
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| CN105099166A true CN105099166A (en) | 2015-11-25 |
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| CN201410202619.0A Pending CN105099166A (en) | 2014-05-14 | 2014-05-14 | Method for improving power-on stability of multiplexing enabled pin and chip |
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| CN101276074A (en) * | 2007-03-27 | 2008-10-01 | 台达电子工业股份有限公司 | LCD, backlight module and light source drive control device |
| CN101916136A (en) * | 2010-06-28 | 2010-12-15 | 浙江大华技术股份有限公司 | System and method for reducing requirements for power supply power in hard disk array system |
| US20120140523A1 (en) * | 2010-12-03 | 2012-06-07 | Semiconductor Energy Laboratory Co., Ltd. | Dc-dc converter and manufacturing method thereof |
| CN203942442U (en) * | 2014-05-14 | 2014-11-12 | 成都国星通信有限公司 | The high DC-DC chip of electrical stability on a kind of multiplexing enable pin |
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2014
- 2014-05-14 CN CN201410202619.0A patent/CN105099166A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101254765A (en) * | 2005-05-19 | 2008-09-03 | 曹民 | Multifunctional manual/automatic complementary type headlamp dimmer |
| CN101276074A (en) * | 2007-03-27 | 2008-10-01 | 台达电子工业股份有限公司 | LCD, backlight module and light source drive control device |
| CN101051739A (en) * | 2007-04-13 | 2007-10-10 | 清华大学 | Digital current synthesizer |
| CN101916136A (en) * | 2010-06-28 | 2010-12-15 | 浙江大华技术股份有限公司 | System and method for reducing requirements for power supply power in hard disk array system |
| US20120140523A1 (en) * | 2010-12-03 | 2012-06-07 | Semiconductor Energy Laboratory Co., Ltd. | Dc-dc converter and manufacturing method thereof |
| CN203942442U (en) * | 2014-05-14 | 2014-11-12 | 成都国星通信有限公司 | The high DC-DC chip of electrical stability on a kind of multiplexing enable pin |
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| HTTP://BBS.21DIANYUAN.COM/THREAD-169460-1-1.HTML: "MP8708 DC-DC 电源芯片BST引脚与SW引脚外围设计", 《21世纪电源网》 * |
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Application publication date: 20151125 |
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