for the following circuit determine the range of input voltages V¡ that will maintain V₁ at 8 V. Rs Vo 9192 V₂=8V = 400 mW PZ max RL ' 0.22 ΚΩ
(02) Zener Diode Circuits. (Course: Electronic Devices and Circuit Theory)
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Apply voltage divider rule:VL=RLRS+RLViminso,Vimin=RS+RLRLVLVimin=91Ω+220Ω220Ω×8 voltVimin=311220×8 VoltVi(min)=11.31 Volt
From the circuit:VZ=VL=VA=8 Vso,IL=VLRL=8220AmpIL=36.364 mAandIZM=PzmaxVZ=4008mAIZM=50 mAApply KCL at node-AIRmax=IZM+ILIRmax=50 mA+36.364 mAIR(max)=86.364 mA
Apply KVL in loop:-Vimax+RsIRmax+VZ=0Vimax=RsIRmax+VZput values:Vimax=91Ω×86.364mA+8VVimax=7.859 V+8 VVi(max)=15.859 V
Hence range of Vi:11.31 V⩽V⩽15.859 VAnswer
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