Basic operations of Thermoflagger™
Thermoflagger™ supplies a small constant current to PTC thermistors to detect changes in their resistance (temperature).
The left-hand figure shows the internal block diagram of Thermoflagger™. It consists of a constant-current source, a reference voltage source, a comparator, and a FLAG output function.
Next, we will briefly explain how it works.
When temperature is low, PTC thermistors have relatively small resistance. Therefore, the voltage at the PTCO pin is low. At this time, the PTCGOOD pin is driven High.
When the temperature of a PTC thermistor increases and reaches the critical temperature, its resistance increases dramatically, causing the voltage at the PTCO pin to increase. At this time, the PTCGOOD pin is driven Low.
As shown in this figure, you can easily create an overtemperature detection circuit by combining Thermoflagger™ and PTC thermistors.
Basic of Thermoflagger™
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* Thermoflagger™ is a trademark of Toshiba Electronic Devices & Storage Corporation.
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