The function circuit of bootstrap circuit

Published:2011/7/29 2:36:00 Author:Sophia | Keyword: bootstrap circuit, function | From:SeekIC

The function of bootstrap circuit When the circuit is in the static state, , when R3C3 is large enough,VC3doesn't change with vi, actually has no change. So when vi is negative, T1 conducts the electricity,vKwill change from VCC/2 to correct direction. Considering vD=vC3+vK= VC3+vK, obviously, with the rise of electric potential of K spot, D spot electric potential vD will rise automatically. So even if the output voltage amplitude rise very highly, there are enough current iB1 to make theT1 fully conductive. This working is called the bootstrap, which means the circuit itself increase vD.



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