How to detect the quality of switching power supply chip? IC detection tips

Date：2022-06-20 18:02:08Views：1283

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, due to its own characteristics, has encountered more complex technical and process manufacturing problems in the process of modularization.

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 multimeter function switch to AC voltage (manual 500V or 750V) to ensure that the input voltage is normal;

2. Then adjust the multimeter function switch 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 power management chip manufacturers in the market are different. How to judge a good power management chip or power IC manufacturer's IC chip requires users to make good judgments. We 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 must meet this condition, one is voltage, the other is power. The motherboard power management chip is responsible for the voltage of each chip of the motherboard. Generally, when a bad motherboard is placed in front of us, we can first detect the motherboard power management chip to see whether the chip has output voltage.

1) First of all, the CPU will not work after the mainboard power management chip breaks down, that is to say, the CPU will have no temperature after the mainboard is powered on. 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) For the detection of the power management chip, if the peripheral power supply is normal, but the voltage of the power management chip is abnormal, you can first check the voltage of the G pole of the FET. If you pay attention to the different resistance values, you can basically confirm that the power management chip is faulty.

Power management integrated circuits (pmics) is a chip that takes charge of the transformation, distribution, detection and other power management responsibilities in the electronic equipment system. It is mainly responsible for identifying the CPU power supply amplitude, generating the corresponding short moment wave, and driving the subsequent circuit to output power.

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