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Question
Assuming VCEsat = 0.2 V and β = 50, find the minimum base current (IB) required to drive the transistor given in the figure to saturation.
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Solution
VCC = 3 V
β = 50
IB =?
Collector current
VCC = 3 – 0.2 = 2.8 V
IC = `"V"_"CC"/"R"_"c"`
= `2.8/(1 xx 10^3)`
= 2.8 × 10−3 A
β = `"I"_"c"/"I"_"B"`
IB = `"I"_"c"/β`
= `(2.8 xx 10^-3)/50`
= 56 × 10−6 A
IB = 56 µA
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