Question 15.14: Determine the maximum value of load current at which regulat...
Determine the maximum value of load current at which regulation is maintained for the circuit of Fig. 15.29 .
To maintain V_{i}(\min ) \geq 7.3 V,
V_{r}(\text { peak }) \leq V_{m}-V_{i}(\min )=15 V -7.3 V =7.7 V
so that
V_{r}( rms )=\frac{V_{r}(\text { peak })}{\sqrt{3}}=\frac{7.7 V }{1.73}=4.4 VThe value of load current is then
I_{ dc }=\frac{V_{r}( rms ) C}{2.4}=\frac{(4.4 V )(250)}{2.4}=458 mAAny current above this value is too large for the circuit to maintain the regulator outputat + 5 V.
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