Introduction of eight common power management IC chips and detection methods

Date：2022-01-12 15:23:29Views：3631

Power supply IC is an indispensable component of electronic equipment. If the power supply IC is damaged in the circuit, the electronic equipment will stop working. Therefore, it is necessary to make a correct judgment on the integrated circuit. Before testing the power IC 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 if necessary, so as to better judge and prove whether the device is damaged. The following is an introduction to eight common power management IC chips and detection methods.

The main part of the power management semiconductor book is the power management IC, which can be roughly summarized into the following 8 kinds.

1. AC / DC modulation IC.It contains low-voltage control circuit and high-voltage switching transistor.

2. DC / DC modulation IC.Including step-up / step-down regulator and charge pump.

3. Power factor control PFC premodulation IC.Provide a power input circuit with power factor correction function.

4. Pulse modulation or pulse amplitude modulation PWM / PFM control IC.It is a pulse frequency modulation and / or pulse width modulation controller for driving external switches.

5. Linear modulation IC (such as linear low voltage drop regulator LDO, etc.).It includes positive and negative regulators and low-pressure drop LDO modulation tubes.

6. Battery charging and management IC.Including battery charging, protection and power display IC, and "smart" battery IC for battery data communication.

7. Hot plug board control IC(avoid the influence of inserting or unplugging another interface from the working system).

8. Switching function IC of MOSFET or IGBT.

Among these power management ICs, voltage regulation IC is the fastest developing and most productive part. Various power management ICs are basically related to some related applications, so more types of devices can be listed for different applications. In general, the simplest and most intuitive IC detection method of power chip is to measure the input and output voltage.

1. First adjust the function switch of the multimeter to the AC voltage (manual 500V or 750V) 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.

Switching power supply chip has a wide range of applications, including not only separate power conversion (mainly DC to DC, i.e. DC / DC), separate power distribution and detection, but also the system combining power conversion and power management. The development of power management IC is of great significance to improve the performance of the whole machine. Its performance has a direct impact on the performance of the whole machine. Through the above detection methods, I believe that engineers can generally quickly detect the quality of power IC chips.