Over temperature detection solution

Over temperature detection solution with Thermoflagger™

Thermoflagger™ IC in combination with PTC thermistors helps to configure a simple over temperature detection solution.

Thermal management is important to ensure optimal performance and protect electronic devices from thermal damage.

Toshiba's Thermoflagger™ over-temperature detection ICs offer an over temperature protection solution in combination with PTC thermistors or temperature sensor ICs.

The resistance of PTC thermistors rises with temperature. When several PTC thermistors are connected in series with a constant current source inside the Thermoflagger™, the Thermoflagger™ can detect the PTC thermistor voltage using an internal comparator and constant current source. In case of an over temperature condition the resistor value of the PTC thermistors(s) rises and terminal voltage at the comparator rises. The Thermoflagger™ detects this as the result of a temperature change beyond the temperature set as the normal state.

Features

Reference website of PTC thermistor from Murata Manufacturing Co., Ltd. 
[https://www.murata.com/products/thermistor/ptc/overview/lineup/prf?excid=ww_we%20f_tss_ttl_tmp_xx]

Application

• Solid State Drive
• Tablet Device
• Server 
• Applications that require thermal management.

Benefits

       Comparison with temperature sensor IC

• General temperature sensor ICs can measure temperature at a specific point, however it is necessary to place an IC at each point where the temperature is to be measured.
• Toshiba's Thermoflagger™ solution can detect several points using external PTC thermistors. A more robust over temperature protection solution can be realized by combining Toshiba's Thermoflagger™ with general temperature sensor IC(s).

Block Diagram

Description of Above Graphic

Simple Block Diagram comparing between Temperature Sensor ICs and Thermoflagger