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 current every 2 seconds, but if I short-circuit the output terminal directly, the frequency of the chip's startup detection will be It is 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.
Are there anyone who can share their insights~~~
Cate Veröffentlicht am November 4, 2020
Some ICs will adjust the detection frequency according to the current value.
Keri Veröffentlicht am November 4, 2020
The overcurrent is generally the current of the mirror MOS, and the short circuit can also detect the voltage drop of the output voltage.
Monet Veröffentlicht am November 4, 2020
This should be determined according to the size of the current, over-current stop vibration, short-circuit burn insurance.
Herman Veröffentlicht am November 4, 2020
The two are not copper, the overcurrent usually continues to output at a constant current, and the short-circuit protection may be constant current or cut off the output.
