Environmental Temperature Effects On The Non-Operating Current And Operating Current Circuit

Published:2011/5/11 1:25:00 Author:Robert | Keyword: Environmental Temperature, Non-Operating Current, Operating Current | From:SeekIC

The Environmental Temperature Effects On The Non-Operating Current And Operating Current Circuit is shown below. 1.The maximum working voltage.PTC thermistor is in series in the circuit. When normally working it only has little voltage kept on the PTC thermistor. If the PTC thermistor starts in high impedance status, it would stand nearly the whole power supply voltage. So it should have large enough standing voltage while choosing PTC thermistor, and also should consider the possible wave motion caused by the power supply voltage.2.Non-operating current and operating current.To achieve stable switch functions, the operating current should be at least double of the non-operating current.Because of the environmental temperature's effects on the non-operating current and operating current is so big (see picture 1), the worst case should take into account. For non-operating current, it's best to choose the value at the available maximum environmental temperature. For operating current, it's best to choose the value at the available low environmental temperature.3.Available maximum current at the maximum working voltage.If requiring the PTC thermistor to run the protection function, it needs to check out if the circuit has the conditions of producing larger than the available maximum current, which generally means the possible short circuit situation of the users' application. The specifications document has given the maximum current value, and when using exceeding this value it may cause the PTC thermistor broken or early disabled.



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