CN107919791A - A kind of Voltage Feedback system and method for integrated circuit module - Google Patents

Abstract

The embodiment of the present application discloses a voltage feedback system and method for an integrated circuit power supply module. The system includes: a voltage conversion chip and multiple sets of feedback resistors, and multiple sets of feedback resistors are integrated in the voltage conversion chip in parallel; the voltage conversion The chip is provided with a feedback pin, an output voltage pin, and a preset voltage pin matching each set of feedback resistors in multiple sets of feedback resistors. The feedback pin is connected to the preset voltage pin that needs to output voltage, and the output voltage pin is The pin is connected to the output voltage terminal of the power supply module. The method includes: acquiring the current output voltage of the integrated circuit, configuring the corresponding voltage pin in the voltage conversion chip to connect with the FB pin according to the output voltage, or using the FB pin to externally connect a feedback resistor to realize the voltage output meeting the requirement. The system and method in the present application can effectively improve the reliability of the circuit, improve the anti-interference performance of the feedback circuit, and help to improve the stability of the output voltage.

Description

A voltage feedback system and method for integrated circuit power supply module

technical field

The present application relates to the technical field of integrated circuits, in particular to a voltage feedback system and method for integrated circuit power supply modules.

Background technique

In high-speed ultra-large-scale integrated circuits, the load has the characteristics of low operating voltage, large operating current, and high current change rate corresponding to the load when the circuit operating state is switched. Since the power supply module of the integrated circuit usually uses a voltage converter to control the output power supply voltage, the voltage converter is a voltage conversion chip. When the input voltage changes, the load disturbance, etc. It may even cause abnormal function of the integrated circuit. Therefore, in order to maintain the stability of the voltage at the load terminal of the integrated circuit, it is necessary to introduce voltage negative feedback into the integrated circuit power supply module, and adjust the output voltage of the voltage converter through a feedback closed-loop circuit.

At present, the feedback closed-loop circuit of the power supply module in the integrated circuit is usually: use the structure of the voltage conversion chip externally connected to the voltage divider circuit, see Figure 1 for details, where R ₁ and R ₂ are voltage divider resistors, and C1, C2, and C are filter capacitors , L is the inductance, U _O is the output voltage of the power supply module, _RL is the load of the integrated circuit, VT1 is the upper bridge MOS tube, and VT2 is the lower bridge MOS tube. In Figure 1, a resistive voltage divider network is used as the voltage divider circuit, and the voltage conversion chip is connected to the voltage divider circuit through the feedback pin FB. Due to the existence of the voltage divider circuit, the voltage converter uses the feedback voltage V _FB to convert the voltage in the voltage divider circuit The voltage drop is amplified to (R ₁ + R ₂ )/R ₂ times the voltage across R2, and the voltage drop of the voltage divider circuit is the output voltage of the power supply module. Therefore, the output voltage of the power supply module is regulated and controlled by the voltage conversion chip .

However, in the feedback closed-loop circuit of the current power supply module, when the voltage conversion chip is externally connected to the voltage divider circuit, the voltage divider resistor and the circuit need to be soldered, too many solder joints are easily interfered by the external circuit, and the feedback circuit is affected by the layout of the voltage divider resistor The reliability of the circuit is not high enough due to the influence of various factors such as the accuracy of the resistor and the voltage divider. In addition, in the current feedback closed-loop circuit, the wiring connected to the feedback pin and the feedback resistor is very sensitive, and a large amount of noise in the circuit will be picked up during the working process, thereby affecting the load regulation rate and causing signal jitter. Therefore, the current feedback closed-loop circuit has poor anti-interference.

Contents of the invention

Embodiments of the present application provide a voltage feedback system and method for an integrated circuit power supply module to solve the problems of poor anti-interference and insufficient reliability of the feedback closed-loop circuit in the prior art.

In order to solve the above technical problems, the embodiment of the present application discloses the following technical solutions:

A voltage feedback system for an integrated circuit power supply module, characterized in that the system includes:

A voltage conversion chip and multiple sets of feedback resistors, the multiple sets of feedback resistors are integrated in the voltage conversion chip in parallel;

The voltage conversion chip is also provided with a feedback pin, an output voltage pin, and a preset voltage pin matching each set of feedback resistors in the plurality of sets of feedback resistors, and the feedback pin is connected to all the feedback pins that need to output voltage. The preset voltage pin is connected, and the output voltage pin is connected to the external load terminal of the power supply module.

Optionally, any set of feedback resistors in the plurality of sets of feedback resistors includes two voltage divider resistors, and the two voltage divider resistors are connected in series.

Optionally, one end of the plurality of groups of feedback resistors is connected to the ground end of the voltage conversion chip, and the other end is connected to an external load end through an output voltage pin.

Optionally, the feedback pin in the voltage conversion chip is also connected to an external voltage dividing resistor for providing an output voltage other than the preset voltage.

Optionally, the voltage values of the preset voltage pins include: 0.9V, 1V, 1.05V, 1.1V.

A voltage feedback method for an integrated circuit power supply module, characterized in that the method includes the following steps:

Obtain the output voltage required by the integrated circuit;

judging whether the output voltage is the voltage value of the preset voltage pin in the voltage conversion chip;

When the output voltage is the voltage value of the preset voltage pin in the voltage conversion chip, the preset voltage pin corresponding to the output voltage in the voltage conversion chip is configured to be connected to the feedback pin.

Optionally, the method also includes:

When the output voltage exceeds the voltage value range of the preset voltage pin in the voltage conversion chip, the feedback pin in the voltage conversion chip is configured to be connected to an external voltage dividing resistor.

Optionally, when the voltage pin is a preset voltage pin, configuring a method for connecting a voltage pin corresponding to the output voltage in the voltage conversion chip to a feedback pin includes the following steps:

Calculate the corresponding feedback resistance according to the output voltage;

Selecting a preset voltage pin matching the feedback resistor according to the feedback resistor;

Connect the preset voltage pin with the feedback pin.

Optionally, one end of the feedback resistor is connected to the ground terminal of the voltage conversion chip at the shortest distance to minimize the voltage drop on the wiring, and the other end of the feedback resistor is connected to the external load terminal through the output voltage pin of the voltage conversion chip. Connect with the shortest distance to maximize the output voltage.

Optionally, when the output voltage exceeds the voltage value range of the preset voltage pin in the voltage conversion chip, configuring the method for connecting the feedback pin in the voltage conversion chip to an external voltage dividing resistor includes the following steps:

According to the output voltage, using the formula Calculate the value of the external voltage divider resistor;

Selecting a corresponding external voltage dividing resistor according to the value of the external voltage dividing resistor;

Connect the external voltage dividing resistor with the feedback pin in the voltage conversion chip.

The technical solutions provided by the embodiments of the present application may include the following beneficial effects:

The embodiment of the present application provides a voltage feedback system for an integrated circuit power supply module. The voltage feedback system integrates multiple groups of feedback resistors in parallel into the voltage conversion chip, which greatly saves the space and solder joints of the external circuit, thereby effectively improving Circuit reliability; since multiple sets of feedback resistors are integrated in parallel into the voltage conversion chip, and the feedback lines between multiple sets of feedback resistors are also integrated into the voltage conversion chip, it can effectively prevent the feedback line from picking up the noise of the external circuit, thereby The anti-interference performance of the feedback circuit is greatly improved, which is conducive to improving the stability of the output voltage. In the embodiment of the present application, the feedback pin is also connected to an external voltage dividing resistor, which facilitates the flexible design of the voltage conversion chip, thereby making the selection range of the output voltage value wider. In addition, in the embodiment of the present application, one end of multiple sets of feedback resistors is connected to the ground terminal of the voltage conversion chip, and the other end is connected to the external load terminal through the output voltage pin. This connection method can output voltage within the range of load current variation. The percentage of the reduction amount change is reduced to the minimum, so as to obtain the best load regulation rate, which is conducive to maximizing the stability of the output voltage from the perspective of voltage divider circuit wiring.

The embodiment of the present application also provides a voltage feedback method for an integrated circuit power supply module, the method first obtains the output voltage required by the integrated circuit; then judges whether the output voltage is the voltage value of the preset voltage pin in the voltage conversion chip; When the output voltage is the voltage value of the preset voltage pin in the voltage conversion chip, the preset voltage pin corresponding to the output voltage in the voltage conversion chip is configured to be connected to the feedback pin. Since the matching relationship between the feedback resistor and the preset voltage pin has been integrated into the voltage conversion chip in the embodiment of the present application, by selecting the feedback pin to be connected to a certain preset voltage pin, it is equivalent to selecting the preset voltage The output voltage corresponding to the pin. Since different voltage pins are connected with different preset voltages in this embodiment, a large number of external circuits can be effectively avoided, which is beneficial to improve the reliability and anti-interference performance of the circuit.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, In other words, other drawings can also be obtained from these drawings on the premise of not paying creative work.

FIG. 1 is a schematic diagram of a circuit structure of a voltage feedback device used in an integrated circuit power supply module in the background technology;

FIG. 2 is a schematic circuit structure diagram of a voltage feedback system for an integrated circuit power supply module provided by an embodiment of the present application;

FIG. 3 is a schematic flowchart of a voltage feedback system method for an integrated circuit power supply module provided by an embodiment of the present application;

Figure 4a is a schematic diagram of a circuit structure in which feedback resistors are connected in series;

Figure 4b is a schematic diagram of a circuit structure in which feedback resistors are connected in parallel;

FIG. 5 is a schematic flowchart of another voltage feedback system method for an integrated circuit power supply module provided by an embodiment of the present application.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

Embodiment one

The voltage feedback system in this application is applied to the power supply module in the integrated circuit, and is used to adjust the output voltage of the power supply module, so as to ensure the stability of the output voltage of the integrated circuit power supply module. Referring to FIG. 2 , FIG. 2 is a schematic circuit structure diagram of a voltage feedback system for an integrated circuit power supply module provided by an embodiment of the present application. It can be seen from FIG. 2 that the voltage feedback system in the embodiment of the present application mainly includes a voltage conversion chip and multiple sets of feedback resistors, and multiple sets of feedback resistors are integrated in the voltage conversion chip in parallel. For example: the voltage conversion chip is provided with a feedback pin FB, an output voltage pin Vo and preset voltage pins FB1, FB2, FB3...FBn, and these preset voltage pins FB1, FB2, FB3...FBn are connected with multiple groups Each set of feedback resistors in the feedback resistors is matched. The number of feedback resistors in this embodiment can be two groups, three groups..., and the specific number is determined according to the requirements of the integrated circuit for different output voltages of the power supply module in actual situations. In addition, the feedback pin FB is connected to a preset voltage pin for voltage output, and the output voltage pin Vo is connected to an external load terminal of the power supply module, and the external load terminal is also the output voltage terminal of the power supply module.

In this embodiment, multiple sets of feedback resistors are integrated in parallel into the voltage conversion chip, which greatly reduces the solder joints of the integrated circuit and is beneficial to improve the reliability of the circuit. Since multiple sets of feedback resistors are integrated into the voltage conversion chip, the connection lines between multiple sets of feedback resistors will also be integrated into the voltage conversion chip, so that many circuits will be integrated into the chip, effectively saving external circuits space, thereby effectively avoiding the troubles caused by the layout and wiring of the feedback circuit, which is conducive to improving the anti-interference performance of the feedback circuit.

In the embodiment of the present application, multiple groups of feedback resistors are connected in parallel, which can increase the number of output voltage values of the power supply module. In the following, multiple sets of feedback resistors are connected in series and in parallel for comparison. Referring to Fig. 4a and Fig. 4b, Fig. 4a is a schematic diagram of a circuit structure in which feedback resistors are connected in series, and Fig. 4b is a schematic diagram of a circuit structure in which feedback resistors are connected in parallel.

In Figure 4a, the feedback resistor consists of four resistors R ₁ , R ₂ , R ₃ , and R ₄ connected in series. One of FB1, FB2, and FB3 is connected to the FB pin to realize three sets of output voltages. In addition, when FB1 and FB2 are connected to the FB pin, the output voltage is When FB1 and FB3 are connected and then connected to the FB pin, or when FB1, FB2 and FB3 are connected and then connected to the FB pin, the output voltage is When FB2 and FB3 are connected to the FB pin, the output voltage is To sum up, when the feedback resistors are connected in series, the number of N pins that can output voltage values is:

In Figure 4b, the feedback resistor is composed of six resistors R ₁ , R ₂ , R ₃ , R ₄ , R ₅ , and R ₆ in series. Select one of FB1, FB2, and FB3 to connect to the FB pin to achieve three sets of output Voltage. In addition, when FB1 and FB2 are connected to the FB pin, the output voltage is When FB1 and FB3 are connected to the FB pin, the output voltage is When FB2 and FB3 are connected to the FB pin, the output voltage is When FB1, FB2, and FB3 are connected to the FB pin, the output voltage is To sum up, when the feedback resistors are connected in parallel, the number of voltage values that can be output by N pins is: 2 ^N -1. When N≧3, the number of output voltage values in parallel connection is more than that in series connection, so in this embodiment, the feedback resistors are connected in parallel.

Any set of feedback resistors among multiple sets of feedback resistors in the embodiment of the present application may be composed of two voltage dividing resistors, wherein the two voltage dividing resistors are connected in series.

In this embodiment, the preset voltage pin is connected to the feedback pin FB, and the output voltage pin Vo is connected to the output voltage terminal of the power supply module. After determining the required feedback voltage value according to the current output voltage, by configuring the preset voltage pin The pin can realize the output of the preset voltage of the chip.

Specifically, for the voltage conversion chip, the voltage of the feedback pin FB is fixed. When the voltage feedback system is used to adjust the output voltage of the power supply module, the feedback resistor is usually calculated and selected according to the required output voltage. However, in this embodiment of the application, multiple groups of feedback resistors are integrated into the voltage conversion chip in parallel, which is equivalent to calculating and selecting the feedback resistors in advance and integrating them into the chip. Each group of feedback resistors corresponds to an output voltage, for example : The FB1 pin is equivalent to the first voltage pin, the FB2 pin is equivalent to the second voltage pin, and then by connecting the feedback pin FB with a preset voltage pin from FB1 to FBn, it can provide An output voltage required by the power supply module. This kind of structural design can directly control the corresponding pin output through the voltage conversion chip, avoiding a large number of external voltage divider circuits, thereby improving the reliability and anti-interference of the circuit, and the selection of the output voltage is very convenient. In this embodiment, the voltage values of the preset voltage pins include commonly used 0.9V, 1V, 1.05V, and 1.1V. Of course, the preset voltage values in the embodiments of the present application are not limited to the above voltage values, and can also be designed as other commonly used voltage values according to user requirements.

In order to further improve the flexibility of feedback voltage selection in the implementation of the present application, the feedback pin in the voltage conversion chip is also connected to an external voltage dividing resistor for providing an output voltage other than the preset voltage. That is to say, in this embodiment, in addition to the preset voltage output values of the chip pins FB1, FB2, FB3 . Therefore, the structural design of the feedback pin further enhances the flexibility of the voltage feedback system in this embodiment. The principle of externally connecting voltage dividing resistors in this embodiment is the same as that in the prior art.

In the embodiment of the present application, one end of multiple sets of feedback resistors is connected to the ground terminal of the voltage conversion chip, and the other end is connected to the external load terminal through the output voltage pin. This connection method can obtain the best load ratio. Specifically, one end of the multiple groups of feedback resistors is connected to the ground end close to the voltage conversion chip, so as to minimize the voltage drop consumed on the ground trace in the feedback circuit. In order to minimize the voltage drop consumed on the ground trace, it can be achieved by selecting the ground trace material and connecting the ground terminals of multiple sets of feedback resistors with the ground terminal of the voltage conversion chip with the shortest distance. The other end of multiple sets of feedback resistors is connected to the external load terminal through the output voltage pin, so that the voltage of the external load terminal, that is, the output voltage can reach the maximum. Correspondingly, it is also possible to select materials from the grounding line to ground multiple sets of feedback resistors Terminal and the ground terminal of the voltage conversion chip are connected with the shortest distance to achieve.

In the following, referring to FIG. 2 , taking the most common resistive voltage divider in a DC-DC voltage conversion chip as an example, a method for realizing the optimal load ratio in the embodiment of the present application will be described in detail. Any set of feedback resistors in the multiple sets of feedback resistors of the resistive voltage divider is composed of two voltage divider resistors, and the two voltage divider resistors are connected in series. First, determine the reference direction. If the direction of resistor R1 in Figure ₂ is up and the direction of resistor R2 is down, a preferred connection method is _{: connect} the lower end of resistor R2 to the ground terminal of the voltage conversion chip, also That is, the lower end of the resistor R2 is connected to the reference voltage point of the feedback voltage V _{FB ;} meanwhile, the upper end _of the resistor R1 is electrically connected to the load end of the integrated circuit power supply module. Since the standard calculation formula for a voltage divider is: It is equivalent to a voltage divider that divides the voltage _drop across the voltage dividing resistor R2 by a leverage factor Amplified to obtain the voltage of the entire voltage divider, and the output voltage of the power supply module is the voltage at both ends of the load. _In practical applications, there are traces between the lower end of resistor R2 and the ground point, and between the upper end _of resistor R1 and the load. These traces themselves have impedance, so when the load current is not 0, there will be a voltage drop . _In the embodiment of this application, the lower end of resistor R2 is connected to the ground terminal of the voltage conversion chip, that is, the lower end of resistor R2 is connected to the reference voltage point of the feedback voltage V _FB , so that the voltage difference between _both ends of R2 is _closest to V _FB ; At the same time, the upper end _of the resistor R1 is electrically connected to the load end of the integrated circuit power supply module, so that the voltage at both ends of the load is the voltage of the amplified voltage divider minus the voltage drop of the wiring. Therefore, this connection method can The best adjustment rate is obtained while keeping the wiring material consistent, so that the voltage stability of the power supply module is the best.

Embodiment two

Referring to FIG. 3 , it can be seen from FIG. 3 that the present application also provides a voltage feedback method for an integrated circuit power supply module. The method comprises the steps of:

S1: Obtain the output voltage required by the integrated circuit.

S2: Determine whether the output voltage is the voltage value of the preset voltage pin in the voltage conversion chip.

S3: When the output voltage is the voltage value of the preset voltage pin in the voltage conversion chip, connect the preset voltage pin corresponding to the output voltage in the voltage conversion chip to the feedback pin, so as to realize the output of the preset voltage value.

Specifically, step S3 also includes the following process:

S31: Calculate the corresponding feedback resistance according to the output voltage.

S32: Select a preset voltage pin matching the feedback resistor according to the feedback resistor.

S33: Connect the preset voltage pin with the feedback pin.

The voltage feedback method and principle of the integrated circuit power supply module in this embodiment have been described in detail in the embodiment shown in FIG. 2 , and the two embodiments may refer to each other, so details will not be repeated here.

Embodiment three

Referring to FIG. 5 on the basis of the embodiment shown in FIG. 3 , FIG. 5 is a schematic flowchart of another voltage feedback system method for an integrated circuit power supply module provided by an embodiment of the present application.

As can be seen from Figure 5, in order to further increase the flexibility of output voltage selection, after step S3, the embodiment of the present application also includes step S4: when the output voltage exceeds the voltage value range of the preset voltage pin in the voltage conversion chip, configure the voltage The feedback pin in the conversion chip is connected with an external voltage dividing resistor.

Specifically, firstly, according to the output voltage, using the formula Calculate the value of the external voltage-dividing resistor; then select the corresponding external voltage-dividing resistor according to the value of the external voltage-dividing resistor; connect the external voltage-dividing resistor to the feedback pin in the voltage conversion chip, so as to realize the preset voltage through the external voltage-dividing resistor A voltage value other than the value is output.

Further, in the embodiment of the present application, the following circuit connection method can be selected: one end of the feedback resistor is connected to the ground terminal of the voltage conversion chip at the shortest distance, and the other end is connected to the external load terminal at the shortest distance through the output voltage pin of the voltage conversion chip .

The voltage feedback method and principle of the integrated circuit power supply module in this embodiment have been described in detail in the embodiments shown in FIG. 2 and FIG. 3 , and the three embodiments may refer to each other and will not be repeated here.

The above descriptions are only specific implementation manners of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the application. Therefore, the present application will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A kind of 1. Voltage Feedback system for integrated circuit module, it is characterised in that the system comprises：

   Voltage conversion chip and multigroup feedback resistance, multigroup feedback resistance are integrated in the voltage conversion core with parallel way In piece；

   Be additionally provided with the voltage conversion chip feedback pin, output voltage pin and with it is every in multigroup feedback resistance The group matched predeterminated voltage pin of feedback resistance, the feedback pin and the predeterminated voltage pin for needing progress voltage output Connection, the external loading end connection of the output voltage pin and power supply module.
2. A kind of 2. Voltage Feedback system for integrated circuit module according to claim 1, it is characterised in that institute Any one group of feedback resistance stated in multigroup feedback resistance includes two divider resistances, and two divider resistances are connected in series.
3. A kind of 3. Voltage Feedback system for integrated circuit module according to claim 2, it is characterised in that institute The one end for stating multigroup feedback resistance is connected with the ground terminal of the voltage conversion chip, the other end by output voltage pin with it is outer Section load end connects.
4. A kind of 4. Voltage Feedback system for integrated circuit module according to claim 1, it is characterised in that institute State the feedback pin in voltage conversion chip to be also connected with external divider resistance, for providing the output electricity outside predeterminated voltage Pressure.
5. 5. a kind of Voltage Feedback system for integrated circuit module according to any one in claim 1-4, It is characterized in that, the magnitude of voltage of the predeterminated voltage pin includes：0.9V、1V、1.05V、1.1V.
6. 6. a kind of voltage feedback method for integrated circuit module, it is characterised in that described method includes following steps：

   Obtain the required output voltage of integrated circuit；

   Judge the output voltage whether be predeterminated voltage pin in voltage conversion chip magnitude of voltage；

   When the output voltage be voltage conversion chip in predeterminated voltage pin magnitude of voltage when, configure voltage conversion chip in The corresponding predeterminated voltage pin of output voltage is connected with feedback pin.
7. A kind of 7. voltage feedback method for integrated circuit module according to claim 6, it is characterised in that institute The method of stating further includes：

   When the output voltage exceeds the range of voltage values of predeterminated voltage pin in voltage conversion chip, voltage conversion core is configured Feedback pin in piece is connected with external divider resistance.
8. A kind of 8. voltage feedback method for integrated circuit module according to claim 6, it is characterised in that when When the voltage pin is predeterminated voltage pin, configure voltage conversion chip in voltage pin corresponding with the output voltage with The method of feedback pin connection, includes the following steps：

   According to the output voltage, corresponding feedback resistance is calculated；

   According to the feedback resistance, selection and the matched predeterminated voltage pin of the feedback resistance；

   The predeterminated voltage pin is connected with feedback pin.
9. A kind of 9. voltage feedback method for integrated circuit module according to claim 8, it is characterised in that institute The one end for stating feedback resistance is connected with beeline by the ground terminal with voltage conversion chip and makes on cabling pressure drop minimum, described The other end of feedback resistance be connected by the output voltage pin of voltage conversion chip with external loading end with beeline make it is defeated Go out voltage maximum.
10. A kind of 10. voltage feedback method for integrated circuit module according to claim 7, it is characterised in that When the output voltage exceeds the range of voltage values of predeterminated voltage pin in voltage conversion chip, configure in voltage conversion chip The method that is connected with external divider resistance of feedback pin, include the following steps：

    According to the output voltage, formula is utilizedCalculate external divider resistance value；

    According to the external corresponding external divider resistance of divider resistance value selection；

    The external divider resistance is connected with the feedback pin in voltage conversion chip.