In the circuit given below, let VEB(ON)=0.8v and ß=16. Calculate the output current coming from 7805 IC and collector current coming from transistor Q1 for a load of 5Ω.

In the circuit given below, let VEB(ON)=0.8v and ß=16. Calculate the output current coming from 7805 IC and collector current coming from transistor Q1 for a load of 5Ω. Correct Answer IO =111mA, IC= 889mA

When load = 5Ω, IL= 5v/5Ω =1A. The voltage across R1 is 7Ω × 1A=7v. Since, IL is more than 100mA, the transistor Q1 turns on and supplies the extra current required. Therefore, IL =(ß+1)IO-+ + ≅111mA. => IC=IL-IO=1A-111mA =889mA.
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