semiconductor
Full Member level 4
electronic fuse question
I intend to use this electronic fuse
**broken link removed**
but I'm dount that the Q3 is wrong connected. If it is connected as above, U(R2) = U(BE). When U(BE) = 0.6, it would conduct but the current will flow from C to E (or from 0V to +V --> I can not understand this circuit if Q3 is connected as above.
But if we change it to PNP transistor, it would be wrong because U(R2) = U(BE) > 0. The transistor Q3 PNP will never conduct.
Can someone explain how this circuit work and if it is wrong, how to correct it to be right?
I intend to use this electronic fuse
**broken link removed**
but I'm dount that the Q3 is wrong connected. If it is connected as above, U(R2) = U(BE). When U(BE) = 0.6, it would conduct but the current will flow from C to E (or from 0V to +V --> I can not understand this circuit if Q3 is connected as above.
But if we change it to PNP transistor, it would be wrong because U(R2) = U(BE) > 0. The transistor Q3 PNP will never conduct.
Can someone explain how this circuit work and if it is wrong, how to correct it to be right?