Cart ( )DC Stabilized Power Supply: How to ensure power supply stability in practical applications?
2023/10/19 16:54:34
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Electronic devices that provide stable DC power supply play a key role in the field of modern electronic technology. The key function of these DC regulated power supplies is to ensure that the output voltage is not affected by input voltage fluctuations or load changes, thereby meeting the requirements of high precision, high stability and high reliability The power supply needs of various electronic equipment.
The requirement of electronic equipment is often to be able to continuously provide stable power, which usually requires the output of DC power. In order to meet this demand, DC stabilized power supplies have emerged. DC stabilized power supplies occupy an important position in modern power supply technology, especially for electronics hobbies. For readers, solving power supply problems is the first step in learning the electronics field.
Stabilized power supplies can be classified in many ways, including the output power supply type (DC or AC), the connection method between the voltage stabilizing circuit and the load (series or parallel), the working state of the regulating tube (linear or switching), and the circuit type (simple or Feedback type). There is a hierarchical relationship between these classification methods. Understanding these relationships will help to understand the types of various power supplies more clearly.
First, we can classify according to the output type of the power supply, that is, whether it is DC or AC power. Then, we can classify according to the working status of the regulating tube. Finally, we can further classify according to the connection method between the voltage stabilizing circuit and the load. At this level, More detailed classifications can be made based on the characteristics of specific categories. DC regulated power supplies can be divided into linear and switching types.
If you need a DC regulated power supply that can flexibly adjust the output voltage as needed, then MP1593 is a good choice. MP1593 is a step-down DC-DC device in a small SOP package and has a wide input voltage range ( 4.75V to 28V), the maximum output current can reach 3A, and has high efficiency (up to 95%). The working principle of this IC is based on feedback control, changing the size of the output voltage by adjusting the ratio of resistors R1 and R2.
When designing the application circuit of MP1593, you need to pay attention to the following points:
1. Using chip-type components can significantly reduce the circuit volume and avoid excessively long connecting wires that may introduce external interference and cause circuit instability.
2. Choose multilayer ceramic dielectric chip capacitors (MLCC capacitors) instead of electrolytic capacitors to ensure smaller output voltage ripple.
3. Capacitor C2 must use an X7R type chip capacitor and be as close as possible to MP1593 to reduce the impact of high-frequency interference.
4. Use Schottky barrier diode D1 with a forward current greater than 3A to ensure that inductor L1 can quickly provide sufficient current to the load.
5. Resistors R3\R4\R5 must be chip resistors with an error not exceeding 1% to ensure the accuracy of the output voltage.
6. The rated operating current of inductor L1 must be above 2A.
7. When wiring the PCB, special attention needs to be paid to the arrangement of the ground wires. The ground wires of the input and output parts should be concentrated at one point and then connected together, and this point should be as close as possible to the GND terminal of MP1593.
8. When wiring the PCB, the inductor L1, diode D1 and capacitor C3 should be connected at one point, and the line segment connected to pin3 of MP1593 should be as short and thick as possible.
9. During PCB wiring, the layout area of the inductor L1, diode D1 and capacitor C4 should be minimized to ensure that they are close to each other.
By following the above design principles, a DC regulated power supply with excellent operating stability, low ripple, high precision and low noise can be designed. These design principles can be adjusted according to the different needs of the output voltage to meet the needs of various applications. Requirements.MP1593 is a powerful integrated circuit suitable for various DC regulated power supply designs.
The requirement of electronic equipment is often to be able to continuously provide stable power, which usually requires the output of DC power. In order to meet this demand, DC stabilized power supplies have emerged. DC stabilized power supplies occupy an important position in modern power supply technology, especially for electronics hobbies. For readers, solving power supply problems is the first step in learning the electronics field.
Stabilized power supplies can be classified in many ways, including the output power supply type (DC or AC), the connection method between the voltage stabilizing circuit and the load (series or parallel), the working state of the regulating tube (linear or switching), and the circuit type (simple or Feedback type). There is a hierarchical relationship between these classification methods. Understanding these relationships will help to understand the types of various power supplies more clearly.
First, we can classify according to the output type of the power supply, that is, whether it is DC or AC power. Then, we can classify according to the working status of the regulating tube. Finally, we can further classify according to the connection method between the voltage stabilizing circuit and the load. At this level, More detailed classifications can be made based on the characteristics of specific categories. DC regulated power supplies can be divided into linear and switching types.
If you need a DC regulated power supply that can flexibly adjust the output voltage as needed, then MP1593 is a good choice. MP1593 is a step-down DC-DC device in a small SOP package and has a wide input voltage range ( 4.75V to 28V), the maximum output current can reach 3A, and has high efficiency (up to 95%). The working principle of this IC is based on feedback control, changing the size of the output voltage by adjusting the ratio of resistors R1 and R2.
When designing the application circuit of MP1593, you need to pay attention to the following points:
1. Using chip-type components can significantly reduce the circuit volume and avoid excessively long connecting wires that may introduce external interference and cause circuit instability.
2. Choose multilayer ceramic dielectric chip capacitors (MLCC capacitors) instead of electrolytic capacitors to ensure smaller output voltage ripple.
3. Capacitor C2 must use an X7R type chip capacitor and be as close as possible to MP1593 to reduce the impact of high-frequency interference.
4. Use Schottky barrier diode D1 with a forward current greater than 3A to ensure that inductor L1 can quickly provide sufficient current to the load.
5. Resistors R3\R4\R5 must be chip resistors with an error not exceeding 1% to ensure the accuracy of the output voltage.
6. The rated operating current of inductor L1 must be above 2A.
7. When wiring the PCB, special attention needs to be paid to the arrangement of the ground wires. The ground wires of the input and output parts should be concentrated at one point and then connected together, and this point should be as close as possible to the GND terminal of MP1593.
8. When wiring the PCB, the inductor L1, diode D1 and capacitor C3 should be connected at one point, and the line segment connected to pin3 of MP1593 should be as short and thick as possible.
9. During PCB wiring, the layout area of the inductor L1, diode D1 and capacitor C4 should be minimized to ensure that they are close to each other.
By following the above design principles, a DC regulated power supply with excellent operating stability, low ripple, high precision and low noise can be designed. These design principles can be adjusted according to the different needs of the output voltage to meet the needs of various applications. Requirements.MP1593 is a powerful integrated circuit suitable for various DC regulated power supply designs.
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