Why are switching power supply chips often damaged
1. The duty ratio of the power supply is large, and it is too late to turn off the power supply when it is working, resulting in damage;
2. The greater the power, the more obvious it is, so it is often damaged.
The switching power supply chip is a power supply that uses modern power electronics technology to control the time ratio of the switching tube on and off to maintain a stable output voltage. The switching power supply is generally composed of a pulse width modulation (PWM) control IC and MOSFET.
With the development and innovation of power electronics technology, switching power supply technology is constantly innovating. At present, switching power supply is widely used in almost all electronic equipment due to its small size, light weight and high efficiency. It is an indispensable power supply method for the rapid development of today's electronic information industry.
Characteristics of switching power chip problems
1. The input voltage range of the chip is wide, the general chip is about 10-30V, this 4-60V;
2. The input voltage range of the whole machine is low. Generally, the input voltage range of the whole power supply is 100-400V. The input voltage range of the whole machine made by this chip is also 4-60V;
3. The input and output are not isolated. Generally, the input and output terminals of the switching power supply are isolated. The input and output of the power supply made by this chip are not isolated, that is, there is a common ground;
4. The drive is different. Generally, the chip output driver of the switching power supply is to drive the N-type MOS tube, and this output is to drive the P-type MOS tube;
5. The nature of the input voltage is different. The general switching power supply is designed to adapt to the AC input of the mains. This chip is designed to adapt to the DC power input. Of course, if the chip is fully equipped with a rectifier bridge and capacitor filtering to become a DC power supply, it is also possible.
