By considering this circuitincluding a zener diode and by de

By considering this circuitincluding a zener diode, and by determining the minimum and maximum currents associated with the zener, calculate a maximum value for R. Assuming the units are in ohms, provide only the numerical value.

Note that Vs = 12V, Vz = 5.6V (Pz = 200mW) and R_L = 1k?.

Solution

Vz=5.6V

P=200mW

Izmax=200mW/5.6=35.7mAamps

The Voltage source is greter than Vz so VL=Vz

ILmax=VL/RL=5.6/1K=5.6mA

Ismax=ILmax+Izmax=35.7m+5.6m=41.31mA

Rmax=Vs/Ismax=12/41.31mA=290.5ohm

Rmax=290.5 ohm