Over Temperature Protection Ic

The same method is used in the design of this battery over charging protection circuit.

Over temperature protection ic.

This characteristic is self regulating. Over operating free air temperature range unless otherwise noted 1 min max unit in pgate with respect to vss 0 3 30. Once the ptc cools down it permits the current to flow again. I made simple over temperature protection circuit which will shut down leds when a certain temperature is reached.

A circuit is used to monitor and generate a trigger signal that starts the shutdown process at the high temperatures. For example a zener diode of 7 v can be used in series with a 1n4007 diode. Temperature protection devices are used to protect internal circuits or devices from overheating. 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.

Over temperature protection otp 6. Usually power supplies have a monitoring integrated circuit on their secondary see figure 1 which is in charge of the power supply protections. 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. That is why there will be a lot of dissipating heat.

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. I believe 70 degrees in celsius is good because high power. The resistance of ptc thermistors rises rapidly when a certain temperature is exceeded thus stopping the flow of current.

The diagram below shows the replacement of a temperature sensor ic with an ntc thermistor. 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. Idea super brigth led light will include 100 leds which consume 1 watt per led. The 1n4007 diode has forward voltage drop of 0 7 v so it will provide the extra 0 7 v drop.

This will make the exact 7 7 v which is the required cut in voltage in the circuit. 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.