CN204794683U - Power supply chip output voltage's dynamic adjustment circuit - Google Patents
Power supply chip output voltage's dynamic adjustment circuit Download PDFInfo
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- CN204794683U CN204794683U CN201520457122.3U CN201520457122U CN204794683U CN 204794683 U CN204794683 U CN 204794683U CN 201520457122 U CN201520457122 U CN 201520457122U CN 204794683 U CN204794683 U CN 204794683U
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- supply chip
- output voltage
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Abstract
The utility model relates to a power supply chip output voltage's dynamic adjustment circuit, including the DCDC power supply chip, FB pin first resistance of series connection and second resistance with the DCDC power supply chip, the first inductance of vout pin series connection of chip, first inductance links to each other with first resistance, the one end of second resistance is connected to the GND pin of chip, series connection third resistance on the way of drawing between first resistance and R2, the one end of third resistance is established ties and is had fourth resistance, the one end of fourth resistance is connected with PWM signal generator, be connected with first electric capacity on the way of drawing between third resistance and R4, a capacitance connection is to the GND pin of chip, the GND pin ground connection of chip. This circuit structure is simple, and is with low costs, carries out the output voltage of linear dynamic adjustment DCDC power supply chip through the PWM ripples duty cycle of adjustment PWM signal generator production for the DCDC power supply chip is become by the adjustment of fixed output voltage can dynamic output voltage, thereby has enlarged the application scope of DCDC power supply chip.
Description
Technical field
The utility model relates to a kind of circuit, specifically the circuit of power supply chip output voltage in a kind of dynamic conditioning electronic system.
Background technology
Power supply is the indispensable part of electronic system, is the basic guarantee that electronic system is run.The key of the stable system stable operation especially of the core voltage of system.In circuit design, stable core voltage is provided by special power supply chip usually, usually the output of these power supply chips is all fixing, need in the application of dynamic conditioning core voltage at some, the application of these chips is restricted, therefore, exigence is a kind of the circuit of dynamic conditioning output voltage can solve above-mentioned technical problem.
Summary of the invention
The purpose of this utility model is the dynamic regulating circuit providing a kind of power supply chip output voltage, applies to the occasion needing dynamic conditioning core voltage.
To achieve these goals, the technical solution adopted in the utility model is, a kind of dynamic regulating circuit of power supply chip output voltage, comprise DC/DC power supply chip, by FB pin serial connection first resistance of DC/DC power supply chip and the second resistance, Vout pin serial connection first inductance of chip, described first inductance is connected with the first resistance, one end of described second resistance is connected to the GND pin of chip, the branch road of drawing between the first resistance with the second resistance to be connected the 3rd resistance, one end of described 3rd resistance is in series with the 4th resistance, one end of described 4th resistance is connected with pwm signal generator, the branch road of drawing between the 3rd resistance and the 4th resistance is connected with the first electric capacity, described first electric capacity is connected to the GND pin of chip, the GND pin ground connection of described chip.
Improve as one of the present utility model, described pwm signal generator is power supply chip MCU in systems in which.
Relative to prior art, structure of the present utility model is simple, cost is low, the PWM ripple duty ratio produced by adjustment pwm signal generator carries out the output voltage of linear dynamic adjustment DC/DC power supply chip, make DC/DC power supply chip can dynamic output voltage by originally fixing that output voltage adjustment becomes, thus expand the scope of application of DC/DC power supply chip.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram of the utility model embodiment.
Embodiment
In order to deepen understanding and cognition of the present utility model, below in conjunction with accompanying drawing the utility model be further described and introduce.
Chip AAT1154 is a power supply chip, and it is input as 3.3V, and the voltage Vfb exporting 1.0V ~ 3.5V, FB leads ends is 1.0V.As shown in Figure 1, the dynamic regulating circuit of chip AAT1154 output voltage, by series resistor R1 and resistance R2 between the output (Vout pin) and ground (GND pin) of chip, the part that resistance R1 with R2 is connected is connected the FB pin of chip, and between the Vout pin and resistance R1 of chip series inductance L1.Series resistance R3 on the branch road of drawing between resistance R1 and R2, makes resistance R3 be connected to the FB pin of chip.One end of described resistance R3 is serially connected with resistance R4, and one end of described resistance R4 is connected to the pwm signal output of the MCU of chip.The branch road of drawing between resistance R3 and R4 is connected with electric capacity C1, described electric capacity C1 is also connected with the GND pin of chip.The direct ground connection of GND pin of described chip.
The ingenious practicality of whole circuit design, the low pass filter that the PWM ripple that system MCU exports forms through resistance R4 and electric capacity C1 becomes direct voltage Vpwm, then is connected to the voltage Vfb of chip FB pin by resistance R3.Thus controlling direct voltage Vpwm by the duty ratio Td of control PWM ripple, the change of direct voltage Vpwm directly affects the output voltage Vout of chip by the feedback of resistance R1, thus realizes dynamic conditioning output voltage.
Relation between direct voltage Vpwm, voltage Vfb and output voltage Vout is as follows:
Vout=(R1+R23)/R23*Vfb–R12*(R1+R23)/(R23*(R3+R12))*Vpwm*Td
Wherein, R23=R2//R3, represents the parallel resistance value of resistance R2 and R3, R12=R1//R2, and represent the parallel resistance value of resistance R1 and R2, Vfb represents chip feedback voltage, and Vpwm represents PWM wave-wave peak-to-peak value, and Td represents the duty ratio of PWM ripple.
It should be noted that above-described embodiment, be not used for limiting protection range of the present utility model, equivalents done on the basis of technique scheme or the alternative scope all falling into the utility model claim and protect.
Claims (2)
1. the dynamic regulating circuit of a power supply chip output voltage, it is characterized in that: comprise DC/DC power supply chip, by FB pin serial connection first resistance of DC/DC power supply chip and the second resistance, Vout pin serial connection first inductance of chip, described first inductance is connected with the first resistance, one end of described second resistance is connected to the GND pin of chip, at the first resistance and the 3rd resistance that the branch road of drawing between R2 is connected, one end of described 3rd resistance is in series with the 4th resistance, one end of described 4th resistance is connected with pwm signal generator, 3rd branch road of drawing between resistance and R4 is connected with the first electric capacity, described first electric capacity is connected to the GND pin of chip, the GND pin ground connection of described chip.
2. the dynamic regulating circuit of a kind of power supply chip output voltage as claimed in claim 1, is characterized in that, described pwm signal generator is power supply chip MCU in systems in which.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520457122.3U CN204794683U (en) | 2015-06-30 | 2015-06-30 | Power supply chip output voltage's dynamic adjustment circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520457122.3U CN204794683U (en) | 2015-06-30 | 2015-06-30 | Power supply chip output voltage's dynamic adjustment circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204794683U true CN204794683U (en) | 2015-11-18 |
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ID=54534657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520457122.3U Expired - Fee Related CN204794683U (en) | 2015-06-30 | 2015-06-30 | Power supply chip output voltage's dynamic adjustment circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN204794683U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105429437A (en) * | 2015-12-11 | 2016-03-23 | 魅族科技（中国）有限公司 | Control circuit with output voltage |
| CN108073213A (en) * | 2016-11-17 | 2018-05-25 | 成都华为技术有限公司 | One-board power supply voltage on-line tuning circuit |
| CN109194123A (en) * | 2018-11-19 | 2019-01-11 | 晶晨半导体(上海)股份有限公司 | A kind of PWM voltage regulator circuit |
-
2015
- 2015-06-30 CN CN201520457122.3U patent/CN204794683U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105429437A (en) * | 2015-12-11 | 2016-03-23 | 魅族科技（中国）有限公司 | Control circuit with output voltage |
| CN108073213A (en) * | 2016-11-17 | 2018-05-25 | 成都华为技术有限公司 | One-board power supply voltage on-line tuning circuit |
| US10642297B2 (en) | 2016-11-17 | 2020-05-05 | Huawei Technologies Co., Ltd. | Online voltage adjustment circuit for board power supply |
| CN109194123A (en) * | 2018-11-19 | 2019-01-11 | 晶晨半导体(上海)股份有限公司 | A kind of PWM voltage regulator circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20171115 Address after: No. 12-9 Fengji road in Yuhuatai District of Nanjing City, Jiangsu province 210039 Patentee after: JIANGSU OUDI ELECTRONIC TECHNOLOGY Co.,Ltd. Address before: No. 3 Gu Tan Road in Gaochun Economic Development Zone of Nanjing city in Jiangsu province 211316 Patentee before: NANJING ODIN TECHNOLOGY Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151118 |