The circuit shown in Figure P10.25 is a 9-V battery charger. The purpose of the Zener diode is to provide a constant voltage across resistor R2, such that the transistor will source a constant emitter (and therefore collector) current. Select the values of R2, R1, and VCC such that the battery will be charged with a constant 40-mA current.
Known quantities:
The circuit of Figure P10.25: IC = 40 mA; Transistor large signal parameters.
Find:
Design a constant-current battery charging circuit, that is, find the values of VCC, R1, R2 that will cause the transistor Q1 to act as a 40-mA constant current source.
Assumptions:
Assume that the transistor is forward biased. Use the large-signal model with ? = 100.
Analysis:
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