NTC Thermistor for Switching Power

Working principle of NTC thermistor in switching power supply

The main function of NTC thermistor in the switching power supply circuit is to suppress the surge current, and it is generally connected in series in the circuit. It has a rated zero-power resistance value, and when connected in series in the power circuit, it can effectively suppress the power-on surge current. Once the circuit is energized, the resistance will drop rapidly to negligible power consumption and have no effect on normal operating current. Using a power NTC thermistor to suppress inrush current and protect sensitive electronic equipment from damage is the lowest cost method.

What is the selection principle of thermistor for switching power supply?

In the case of satisfying the steady-state current, the resistance value measured at a temperature of 25 degrees Celsius should be：
R>=1.414*E/Im

Im:Inrush current, it is mentioned that, generally in a switching power supply, the inrush current is 100 times the steady state current

2：Representative inrush current suppression type

3.What type of MF72 NTC Thermistor is used for switching power supply

As mentioned above, if you have difficulty in formula conversion, you can contact us, we will help you choose

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