Over Temperature Protection Ic

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 ic.

The same method is used in the design of this battery over charging protection circuit. Ic data sheets often give some informations about the circuits over temperature protection. I believe 70 degrees in celsius is good because high power. 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.

For example a zener diode of 7 v can be used in series with a 1n4007 diode. The 1n4007 diode has forward voltage drop of 0 7 v so it will provide the extra 0 7 v drop. Over temperature protection otp 6. The resistance of ptc thermistors rises rapidly when a certain temperature is exceeded thus stopping the flow of current.

Usually power supplies have a monitoring integrated circuit on their secondary see figure 1 which is in charge of the power supply protections. This characteristic is self regulating. That is why there will be a lot of dissipating heat. Lets take a microchip ldo mcp1702 for example.

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

A circuit is used to monitor and generate a trigger signal that starts the shutdown process at the high temperatures. 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. The diagram below shows the replacement of a temperature sensor ic with an ntc thermistor. The secondary protection is composed of the secondary safety ptc tco and nonresettable fuse blocks.

Temperature protection devices are used to protect internal circuits or devices from overheating. Idea super brigth led light will include 100 leds which consume 1 watt per led.