Simple current limiting circuit

When the current is less than the value set, the bias current provided by R1 leads the P3 to be saturated to conduct. And it can not afford to control the current. When the current is greater than or equal to the set value, the pressure drop on R would increase and be close to the pressure drop of R2 after acrossing the transistor junction. Then i

t can limit the current through P3 in order to limit the current to a certain level. If R2 is used as a regulator instead, the limiting performance can be more accurate. The drawback of the introduced protection circuit is that the pressure drop can be all down on the transistor when the current is overload, especially a short circuit. Thus, it would lead to certain power consumption.

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