Is there a design difference between over-current protection and short-circuit protection?
Posted: Wed Nov 25, 2020 5:49 am
For some power protection chips, is there a difference in design between over-current protection and short-circuit protection?
I tested an over-current and over-voltage protection chip, and connected a small resistor to the output terminal to make it over-current. After the chip is turned off, it starts to detect the current every 2 seconds, but if I short-circuit the output terminal directly, the frequency of the chip startup detection will Greatly shortened, and the detection time will be greatly extended, resulting in serious heating of the chip.
I think that short circuit is nothing more than an extreme case of overcurrent, and the chip processing mechanism should be the same. But the performance difference on this chip is very big.
Why does this happen?
I tested an over-current and over-voltage protection chip, and connected a small resistor to the output terminal to make it over-current. After the chip is turned off, it starts to detect the current every 2 seconds, but if I short-circuit the output terminal directly, the frequency of the chip startup detection will Greatly shortened, and the detection time will be greatly extended, resulting in serious heating of the chip.
I think that short circuit is nothing more than an extreme case of overcurrent, and the chip processing mechanism should be the same. But the performance difference on this chip is very big.
Why does this happen?