Over Temperature Protection Ic

Over operating free air temperature range unless otherwise noted 1 min max unit in pgate with respect to vss 0 3 30.

Over temperature protection ic.

The same method is used in the design of this battery over charging protection circuit. The resistance of ptc thermistors rises rapidly when a certain temperature is exceeded thus stopping the flow of current. That is why there will be a lot of dissipating heat. I made simple over temperature protection circuit which will shut down leds when a certain temperature is reached.

Ic data sheets often give some informations about the circuits over temperature protection. I believe 70 degrees in celsius is good because high power. Lets take a microchip ldo mcp1702 for example. Bq24308 overvoltage and overcurrent protection ic and li charger front end protection ic 1 features 3 description the bq24308 device is a highly integrated circuit ic.

This will make the exact 7 7 v which is the required cut in voltage in the circuit. For example a zener diode of 7 v can be used in series with a 1n4007 diode. This characteristic is self regulating. Over temperature protection otp 6.

White paper intelligent over temperature protection for led lighting applications 01 october 2013 7 4 ic implementation of smart over temperature protection leveraging the key idea of a patent to use the led driver ic as a thermal sensor a patent pending technology has been developed to protect the leds with a slope dimming characteristic and. Once the ptc cools down it permits the current to flow again. A circuit is used to monitor and generate a trigger signal that starts the shutdown process at the high temperatures. Idea super brigth led light will include 100 leds which consume 1 watt per led.

The accuracy of a relatively simple temperature detection circuit consisting of an ntc thermistor and fixed resistors is fully sufficient for the protection of an hdd and much more cost efficient than a circuit using a temperature sensor ic. Usually power supplies have a monitoring integrated circuit on their secondary see figure 1 which is in charge of the power supply protections. Over temperature protection in a power supply is a protection system that shuts down the power supply when the internal temperature exceeded a safe value. The 1n4007 diode has forward voltage drop of 0 7 v so it will provide the extra 0 7 v drop.

Often the primary protection and gas gauge components are combined into a single ic which may include additional protection features not shown above like over under temperature protection and battery authentication. The diagram below shows the replacement of a temperature sensor ic with an ntc thermistor.