Switching power supply is a high-frequency switching energy conversion electronic circuit, which is often used as the power supply of equipment. Common switching power supply chip conversion classifications are: AC-DC, DC-DC, DC-AC, etc. When debugging switching power supply, in addition to In addition to measuring the voltage of the pins of the switching power supply chip of related components in the control circuit with a voltmeter, it is more important to observe the relevant voltage waveform with an oscilloscope, so as to judge whether the switching power supply is in the best working state. Let us follow Li Microelectronics to understand Reasons and solutions for the high temperature of the switching power supply chip during debugging.

Reasons and solutions for the high temperature of the switching power supply chip:

1. The internal MOSFET loss is too large:

The switching loss is too large, and the parasitic capacitance of the transformer is too large, resulting in a large cross area between the turn-on and turn-off currents of the MOSFET and Vds.​​

Solution: Increase the distance between the transformer windings to reduce the interlayer capacitance. Just as when the windings are wound in multiple layers, a layer of insulating tape (interlayer insulation) is added between the layers.​​

2. Poor heat dissipation: A large part of the heat of the IC is conducted to the PCB and the copper foil on it by the pins. The area of the copper foil should be increased as much as possible and more solder should be applied.​​

3. The air temperature around the IC is too high: the IC should be in a place where the air flows smoothly, and should be kept away from parts with high temperature.

With the continuous innovation of power electronics technology, the switching power supply industry has broad prospects for development. Switching power supply will gradually replace all applications of transformers in life, and is moving towards popularization and miniaturization. Switching power supply chips are widely used in industrial automation control, Military equipment, scientific research equipment, LED lighting, industrial control equipment, communication equipment, electrical equipment, instrumentation, medical equipment, semiconductor refrigeration and heating, air purifiers, electronic refrigerators, liquid crystal displays, LED lamps, communication equipment, audio-visual products, security monitoring , LED strips, computer cases, digital products and instruments and other fields.