Published:2011/6/15 5:44:00 Author:chopper | Keyword: input voltage, three-terminal, integrated regulator, measure | From:SeekIC
The following picture is a regulator circuit,the difference of input voltage and output voltage totally adds to the collector and emitter of controlled transistor.The output current is also the collector current of transistor.The power consumption of transistor Pc=I0 (Ui-U0),that is to say,the higher input voltage Vi is,the great power consumption of transistor is.The input voltage Uimin has to satisfy Uiminā„U0+UDROP.In the formula,UDROP is a voltage drop of the emitter and collector of transistor.Its lowest value is over the saturation voltage UCESAT of transistor.The UDROP of general regulator is about 30V,and regulator with low dropout is below 1V.
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