Hi,
can someone explain the large gap between hold and trip current? For example, I look at a datasheet and see a holding current of 2.5A and a tripping current of 5A. It means, the fuse always holds 2.5A at 25 degrees Celsius, and always trips at 5A.
My real-life circuit is USB powered, by a supply that delivers 5V and 3A max. (USB 2.0 through type-C USB), and the maximum current drawn by my circuit is 2.2A.
If I look at a polyfuse that holds 2.3A then the trip current is 4.6A and way too high to protect the power supply.
If I look at a polyfuse that trips at 3A, then it can only hold 1.5A, which is much too low.
What kind of polyfuse would I need to look for, and why?
Thanks a lot.
can someone explain the large gap between hold and trip current? For example, I look at a datasheet and see a holding current of 2.5A and a tripping current of 5A. It means, the fuse always holds 2.5A at 25 degrees Celsius, and always trips at 5A.
My real-life circuit is USB powered, by a supply that delivers 5V and 3A max. (USB 2.0 through type-C USB), and the maximum current drawn by my circuit is 2.2A.
If I look at a polyfuse that holds 2.3A then the trip current is 4.6A and way too high to protect the power supply.
If I look at a polyfuse that trips at 3A, then it can only hold 1.5A, which is much too low.
What kind of polyfuse would I need to look for, and why?
Thanks a lot.