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Basic Knowledge of PTC Thermistor (POSISTOR)
Temperature of tripping PTC thermistor can be estimated by the operating curve.
How to create the operating curve
The typical dissipation constant is confirmed by measuring the current and the element temperature under the applied abnormal voltage in the environment where the set is used. (This is necessary because chip PTC thermistors have different the dissipation depending on their mounting condition.)
The temperature of PTC thermistor calculate the resistance value using the following formula. Rx=(Abnormal Voltage)2/(typical dissipation constant ×(PTC heating temperature − Ambient Temperature))
This is temperature of PTC thermistor that is tripped by an abnormal voltage.
Figure 1 : R-T characteristics and Operating curves
It represents the relationship between the current and the time until the internal heat generation and external heat dissipation reach an equilibrium state for the application of a voltage above the maximum current.
Figure 2 : Operating time when applying exceeding the trip current
The larger applied voltage (current), the greater the instantaneous power consumption and the shorter the time to thermal equilibrium.
It is defined as the time until the inrush current reaches 1/2 value.
Introduces the basic operating principle and typical applications of PTC thermistors.
We explain here in detail the temperature characteristics (R-T characteristics) of PTC thermistors.
We explain here the maximum voltage / maximum current, withstand voltage, and current-voltage characteristics.
We explain here the hold current and trip current of thermistors.
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