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Common Switching Power Supply Chips and Their Characteristics

Article Source：Kinri Energy | Author：Kinri Energy | Issuing Time：2024.06.04
Switching power supply is a high-efficiency and highly reliable power conversion technology widely used in various electronic devices. The switching power supply chip is the core component of the switching power supply, which determines the performance and characteristics of the switching power supply. In this article, we will introduce several common switching power supply chips and their characteristics.

1. UC3842

UC3842 is a classic current mode PWM controller chip. It has the following characteristics:



●  Internally integrated with functional modules such as oscillators, error amplifiers, PWM comparators, etc., the circuit design is simplified.

●  The working frequency can reach 500kHz, suitable for high-frequency switching power supplies.

●  It has a cycle by cycle current limiting function, which improves the reliability of the power supply.

2.TL494

TL494 is a dual output pulse width modulation chip. Its features include:

●  Internally integrated with two error amplifiers, it can achieve dual output control.

●  It has a dead time control function to prevent two output terminals from conducting simultaneously.

●  The working frequency range is wide, from a few kHz to several hundred kHz.

3. LM2596

LM2596 is a step-down switching power supply chip. Its main characteristics include:

●  The output voltage is adjustable, ranging from 1.25V to 37V.

●  The conversion efficiency is high, reaching over 90%.

●  Internally integrated with functions such as overcurrent protection and overheating protection.

4. TPS5430

TPS5430 is a high-performance buck switching power supply chip. Its characteristics are as follows:

●  The input voltage range is wide, from 4.5V to 36V.

●  It has fast transient response capability and is suitable for situations that require high dynamic performance of power sources.

●  The output voltage and current limiting value can be set through external resistors.

5. MAX1771

MAX1771 is a synchronous rectification buck switching power supply chip. Its prominent features include:

●  The use of synchronous rectification technology has improved conversion efficiency.

●  High output voltage accuracy, up to ± 1%.

●  Has low static current and is suitable for battery powered devices.

These switching power supply chips play important roles in different application scenarios. When selecting a switching power supply chip, factors such as input voltage, output voltage, output power, conversion efficiency, operating frequency, and packaging form need to be considered to meet specific design requirements. At the same time, attention should also be paid to the reliability, cost, and supply situation of the chip.

In summary, the continuous development and innovation of switching power supply chips provide more efficient, reliable, and flexible power solutions for electronic devices. With the advancement of technology, we can expect more high-performance switching power supply chips to be introduced in the future.
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