How to check whether the power chip is good or bad? IC chip detection method

Date：2022-04-20 15:38:46 Views：3126

Switching power supply chips can be divided into AC / DC power supply chips and DC / DC power supply chips. DC / DC converters have been modularized, and the design technology and production process have been mature and standardized at home and abroad, and have been recognized by users. However, the modularization of AC / DC has encountered more complex technical and process manufacturing problems in the process of modularization due to its own characteristics. Power chip is an indispensable component of electronic equipment. If the power chip is damaged in the circuit, the electronic equipment will stop working. How to detect the quality of power chip? If you are interested in what this article is about to cover, you might as well read on.

1、 How to detect the quality of switching power supply chip?

The simplest and most intuitive method is to measure the input and output voltage values.

1. First adjust the function switch of the multimeter to the AC voltage (500V or 750V manually) to ensure that the input voltage is normal;

2. Then adjust the function switch of the multimeter to the DC voltage gear (the manual gear is adjusted to higher than this voltage unit according to the marked voltage), measure the output voltage, and it can be considered as good if it is consistent with the marked voltage.

2、 Judging method of power management chip

At present, the manufacturers of power management chips in the market are different. How to judge a good power management chip or the IC chip of a power IC manufacturer requires users to make a good judgment. Let's take the motherboard as an example:

The motherboard power management chip is a very important missing part of the motherboard. We know that the operation of a component should meet this condition, one is voltage, the other is power. The mainboard power management chip is responsible for the voltage of each chip of the mainboard. Generally, when a bad mainboard is placed in front of us, we can first detect the power management chip of the mainboard to see whether the chip has output voltage.

1) First of all, after the mainboard power management chip is broken, the CPU will not work, that is, after the mainboard is powered on, the CPU will have no temperature. At this time, the diode gear of the meter can be used to test the resistance between the inductance coil and the ground. If the resistance rises after the meter drops, it proves that the power management chip is good, on the contrary, there is a problem.

2) Detection of power management chip 2 if the peripheral power supply is normal but the voltage of power management chip is abnormal, you can check the voltage of FET g pole first. If you pay attention to the different resistance value, you can basically confirm that the power management chip is faulty.

Before testing the power chip, we need to master the purpose, internal structure principle and main electrical characteristics of the IC in the circuit, and analyze the internal electrical schematic diagram when necessary, so as to better judge and prove whether the device is damaged. Through the above detection methods, engineers can quickly judge the quality of the power chip. I hope it can help you. We will bring more wonderful content later. The company's testing services cover: electronic component testing and verification, IC authenticity identification, product design and material selection, failure analysis, function testing, factory incoming material inspection, tape braiding and other testing items. Welcome to call Chuangxin testing. We will serve you wholeheartedly.