Hi guys,
I am kinda stuck with the question. I have managed to work out the zener breakdown voltage when maintaining a regulated 25V output using this equation and re-arranging it slighlty.
Vout = (1+(r1/r2)*vz, Vz = (vout/(1+r1/r2) = 25V/(1+4/1) = 25V. I made r1 = 4k.
I am just not sure about how to to calculate the maximum power in the pass transistor? Would it be the max vin of 50V - 25V * Load, although there is no load resistor, so i am confused. Any guidance would be much appreciated.
Thanks
I am kinda stuck with the question. I have managed to work out the zener breakdown voltage when maintaining a regulated 25V output using this equation and re-arranging it slighlty.
Vout = (1+(r1/r2)*vz, Vz = (vout/(1+r1/r2) = 25V/(1+4/1) = 25V. I made r1 = 4k.
I am just not sure about how to to calculate the maximum power in the pass transistor? Would it be the max vin of 50V - 25V * Load, although there is no load resistor, so i am confused. Any guidance would be much appreciated.
Thanks
Attachments
-
56 KB Views: 23