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azlm
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Homework Statement
Create a 15V regulated power supply capable of providing a maximum load current of 25 mA.
Circuit looks like this: http://i.imgur.com/fMtscbG.png?1ILmax (maximum load resistance) = 25mA
Izt (test current) = 20mA
Izk (knee current) = 25mA
rz = 11 Ω
Vz (nominal zener voltage at Izt)= 15V
Vs = 39V[itex]\pm[/itex]1V
RL = 1kΩ
R = ?
Homework Equations
Vz = Vz0 + rz*Iz
The Attempt at a Solution
Vz=14.78 V
To find R I need to determine the total current in the circuit. I'm not sure whether it's correct to assume that the current Iz=0 when IL=25 mA. Since the load voltage is 25V when IL is at its max I thought it meant that the zener diode would be disconnected.
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