A TPS54360-based output voltage adjustable step-down control circuit

Abstract

The application provides a TPS54360-based output voltage adjustable step-down control circuit, and relates to the field of control circuits, which comprises an AD / DA converter and a DC / DC conversion circuit, the AD / DA converter comprises a processor U1, and the DC / DC conversion circuit comprises a resistor R1, a resistor R2, a resistor R3, an inductor L1, a processor U2, a capacitor C15, a triode Q1, a capacitor C11, a capacitor C12, a resistor R14, a resistor R13, a resistor R12, a resistor R16, a capacitor C13, a capacitor C14 and a diode D1. The utility model adopts TPS54360B DC / DC converter, has 4.5V-60V wide amplitude power input, can output 3.5 ampere current at most, working frequency is 100kHz to 2.5mHz, output is stable and smooth, is enough to undertake most use scene, has the function of preventing reverse connection, and the protection characteristics include the ability of current limit, voltage limit, hot shutdown and remote shutdown; the circuit working temperature is stable, and under the condition of 3 ampere current long-time output, only air cooling can maintain the temperature at about 50 DEG C.

Description

Technical Field

[0001] This application relates to the field of control circuits, and more specifically, to a buck control circuit with adjustable output voltage based on TPS54360. Background Technology

[0002] Traditional DC-DC voltage reduction schemes have a fixed output voltage without circuit modifications. This makes it impossible to apply a single solution to various scenarios, requiring constant adjustments to the hardware circuitry and causing numerous inconveniences in design and production. Summary of the Invention

[0003] The purpose of this application is to provide an output voltage adjustable buck control circuit based on TPS54360, which can solve the above-mentioned technical problems.

[0004] This application provides an adjustable output voltage buck control circuit based on TPS54360, including an AD / DA converter and a DC / DC conversion circuit. The AD / DA converter includes a processor U1, and the DC / DC conversion circuit includes resistors R1, R2, and R3, an inductor L1, a processor U2, a capacitor C15, a transistor Q1, resistors R15, C11, C12, R14, R13, R12, R16, C13, C14, and a diode D1. The twelfth interface of the processor U1 is connected to the eighth interface of the processor U2 through resistors R1, R2, and L1. The emitter (E) of the transistor Q1 is externally connected to a 3.3V voltage, and the base (B) of the transistor Q1 is connected to... The resistor R15 is connected to an external power supply. The collector of the transistor Q1 is connected to the third interface of the processor U2 through the resistor R14. The second interface of the processor U2 is grounded through the capacitors C11 and C123. The third interface of the processor U2 is grounded through the resistor R13. The fourth interface of the processor U2 is grounded through the resistor R12. The input terminal of the diode D1 is grounded. The output terminal of the diode D1 is connected to the eighth interface of the processor U2. The fifth interface of the processor U2 is grounded through the resistor R3. The sixth interface of the processor U2 is grounded through the resistor R16 and the capacitor C13. The sixth interface of the processor U2 is grounded through the capacitor C14. The seventh interface of the processor U2 is grounded.

[0005] Preferably, the processor U2 is model TPS54360B.

[0006] Preferably, the processor U1 is a TLC5620C.

[0007] The beneficial effects of this utility model are:

[0008] This utility model provides an adjustable output voltage step-down control circuit based on TPS54360, including an AD / DA converter and a DC / DC conversion circuit. The AD / DA converter includes a processor U1, and the DC / DC conversion circuit includes resistors R1, R2, and R3, an inductor L1, a processor U2, a capacitor C15, a transistor Q1, resistors R15, capacitors C11 and C12, resistors R14, R13, R12, and R16, capacitors C13 and C14, and a diode D1. The twelfth interface of the processor U1 is connected to the eighth interface of the processor U2 through resistors R1, R2, and L1. The emitter (E) of the transistor Q1 is externally connected to a 3.3V voltage, and the base (B) of the transistor Q1 is externally connected to resistor R15. With power connected, the collector (C) of transistor Q1 is connected to the third interface of processor U2 through resistor R14. The second interface of processor U2 is grounded through capacitors C11 and C123. The third interface of processor U2 is grounded through resistor R13. The fourth interface of processor U2 is grounded through resistor R12. The input terminal of diode D1 is grounded. The output terminal of diode D1 is connected to the eighth interface of processor U2. The fifth interface of processor U2 is grounded through resistor R3. The sixth interface of processor U2 is grounded through resistor R16 and capacitor C13. The sixth interface of processor U2 is grounded through capacitor C14. The seventh interface of processor U2 is grounded. This utility model uses TPS54360B. This DC / DC converter features a wide power input range of 4.5V-60V, a maximum output current of 3.5 amps, and an operating frequency of 100kHz to 2.5mHz. Its stable and smooth output is sufficient for most applications. It includes reverse connection protection and features such as current limiting, voltage limiting, thermal shutdown, and remote shutdown capabilities. The circuit operates at a stable temperature; even with prolonged 3-amp output, air cooling alone can maintain the temperature at around 50℃. Attached Figure Description

[0009] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is the circuit diagram of the AD / DA converter of this utility model;

[0011] Figure 2This is a circuit diagram of the DC / DC converter of this utility model. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0013] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0014] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0015] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0016] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0017] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0018] like Figure 1-2 As shown, an adjustable output voltage buck control circuit based on TPS54360 includes an AD / DA converter and a DC / DC conversion circuit. The AD / DA converter includes a processor U1. The DC / DC conversion circuit includes resistors R1, R2, and R3, an inductor L1, a processor U2, a capacitor C15, a transistor Q1, resistors R15, C11, C12, R14, R13, R12, R16, C13, C14, and a diode D1. The twelfth interface of the processor U1 is connected to the eighth interface of the processor U2 through resistors R1, R2, and L1. The emitter (E) of the transistor Q1 is externally connected to a 3.3V voltage, and the base (B) of the transistor Q1 is externally connected to a power supply through resistor R15. The collector (C) of transistor Q1 is connected to the third interface of processor U2 via resistor R14. The second interface of processor U2 is grounded via capacitors C11 and C123. The third interface of processor U2 is grounded via resistor R13. The fourth interface of processor U2 is grounded via resistor R12. The input terminal of diode D1 is grounded. The output terminal of diode D1 is connected to the eighth interface of processor U2. The fifth interface of processor U2 is grounded via resistor R3. The sixth interface of processor U2 is grounded via resistor R16 and capacitor C13. The sixth interface of processor U2 is grounded via capacitor C14. The seventh interface of processor U2 is grounded. This invention uses TPS54360B. This DC / DC converter features a wide power input range of 4.5V-60V, a maximum output current of 3.5 amps, and an operating frequency of 100kHz to 2.5mHz. Its stable and smooth output is sufficient for most applications. It includes reverse connection protection and features such as current limiting, voltage limiting, thermal shutdown, and remote shutdown capabilities. The circuit operates at a stable temperature; even with prolonged 3-amp output, air cooling alone can maintain the temperature at around 50℃.

[0019] In the diagram, OPA_DACA and DDACA are connected in the same way. For this solution, VFB is a fixed value of 0.8V. The output voltage can be changed simply by changing the voltage of VDACA. According to Kirchhoff's current law, V... FB / R3=(V OUT -V FB ) / R1+(V DACA -V FB ) / R2, after conversion, we get:

[0020] V OUT =-(R1 / R2)*V DACA +(1+R1*((R2+R3) / (R2*R3)))V FB .

[0021] Substitute R1, R2, R3, and V FB Get V OUT = -3.48 * V DACA +32.78(V). Assume V FB The range is 0-5V, then V OUT The output range is 15.38V to 32.78V. The adjustment range and accuracy of the output voltage can be changed by adjusting the resistance values ​​of R1, R2, and R3.

[0022] Wide operating range: Suitable for operating temperatures from -40℃ to +125℃, ultra-wide output voltage range from 4.5V to 60V, output current up to 3.5 Amperes, and programmable operating frequency range from 100kHz to 2.5mHz.

[0023] Safe and reliable: Protection features include current limiting, voltage limiting, thermal shutdown, and remote shutdown capabilities.

[0024] The solution has a wide range of applications. By making simple modifications to this design, the voltage output range can be well adjusted, making the design a one-time solution.

[0025] Power management further reduces power consumption under low load, making significant strides in low-power application scenarios. High EMC resistance: Inductors are added to reduce EMC, and the circuit itself has a small loop, resulting in low EMC. Stable output voltage: Inductors and tantalum capacitors are used to reduce output ripple, ensuring stable output.

[0026] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A step-down control circuit with adjustable output voltage based on TPS54360, characterized in that: The system includes an AD / DA converter and a DC / DC conversion circuit. The AD / DA converter includes a processor U1. The DC / DC conversion circuit includes resistors R1, R2, and R3, an inductor L1, a processor U2, a capacitor C15, a transistor Q1, resistors R15, capacitors C11 and C12, resistors R14, R13, R12, and R16, capacitors C13 and C14, and a diode D1. The twelfth interface of the processor U1 is connected to the eighth interface of the processor U2 through resistors R1, R2, and L1. The emitter (E) of the transistor Q1 is externally connected to a 3.3V voltage, and the base (B) of the transistor Q1 is externally connected to a power supply through resistor R15. The collector (C) of Q1 is connected to the third interface of the processor U2 through the resistor R14. The second interface of the processor U2 is grounded through the capacitors C11 and C123. The third interface of the processor U2 is grounded through the resistor R13. The fourth interface of the processor U2 is grounded through the resistor R12. The input terminal of the diode D1 is grounded. The output terminal of the diode D1 is connected to the eighth interface of the processor U2. The fifth interface of the processor U2 is grounded through the resistor R3. The sixth interface of the processor U2 is grounded through the resistor R16 and the capacitor C13. The sixth interface of the processor U2 is grounded through the capacitor C14. The seventh interface of the processor U2 is grounded.

2. The adjustable output voltage buck control circuit based on TPS54360 according to claim 1, characterized in that: The processor U2 is model TPS54360B.

3. The adjustable output voltage buck control circuit based on TPS54360 according to claim 1, characterized in that: The processor U1 is model TLC5620C.

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