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PNP Output Regulator Grounding Current Circuit

2014-11-27 23:15  
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PNP Output Regulator Grounding Current Circuit
The PNP output low-voltage-drop regulators' common weakness is the grounding current (current consumption of the regulator itself) is more than the input current. Also the output current causes the grounding current having a big variation. The PNP output regulator is that the transistor's base electrode current control the load current, thus this base electrode current would go through the ground and make up a part of the grounding current. As shown in the picture, thepicture shows the control circuit consumption current, also the picture shows the base current. The IH is output current. So, even the load current (the transistor collector electrode current) is small, the I/hFE's grounding current would also change to be the consumption current.