The relationship between the size of the NTC thermistor and the filter capacitor
The size of the NTC thermistor to choose depends on the size of the filter capacitor. The size of the NTC thermistor is determined, and there are strict requirements on the size of the filter capacitor that is allowed to be connected. This value is also related to the maximum rated voltage. In power supply applications, the power-on surge is generated by the charging of the capacitor, so the capacity of the NTC thermistor to withstand surge current is usually evaluated by the allowable access capacitance under a given voltage value.
The size of the NTC thermistor is determined, and the maximum energy it can withstand has been determined. According to the energy consumption formula E=1/2×CV2 of the resistance in the first-order circuit, it can be seen that the allowable access The capacitance value is inversely proportional to the square of the rated voltage. All in all, the larger the input voltage, the smaller the maximum ca