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Electronics-I Lecture 06

# Electronics-I Lecture 06 - VoltageRegulation theloadcurrent...

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Lecture 06 Electronics I 1 Voltage Regulation Voltage regulator circuits provide Constant output voltage in spite of changes in  the load current Constant output voltage in spite of changes in  the input voltage In forward bias region Diode output voltage remains constant at 0.7 Current varies by large amount

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Lecture 06 Electronics I 2 Voltage Regulation In example Variation in input voltage is ±10% (10 V with 1  V ripple) Variation in output voltage is ±0.8% (0.7 V  with 5.35 mV  ripple) Simple voltage regulator can be designed Connecting forward biased diodes in series
Lecture 06 Electronics I 3 Example 3.7 Circuit provides a  constant voltage of 2.1 V Calculate % change in  the regulated voltage  output caused by ±10% change in the  supply voltage Connection of a 1K load n = 2

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Lecture 06 Electronics I 4 With no load I D  = (V DD  - 3V D )/R  = (10 – 2.1)/1 = 7.9 mA              = 2(25)/7.9 = 6.33                  3r d
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Electronics-I Lecture 06 - VoltageRegulation theloadcurrent...

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