The serial connection current expanding circuit of 3-terminal regulated chip

Published:2011/6/24 7:41:00 Author:Seven | Keyword: serial connection, 3-terminal regulated chip | From:SeekIC

When a current that is higher than 0.1A is needed, we can use other types of integrated circuit the following current expanding circuit. The output current of the 78 series circuit is I0=I01+I02, of which I01=Ic1, I02≈0.7V/R1. This serial connection current expanding circuit of 3-terminal regulated chip has the function of over-current protection, when it is normally working, T2 and T3 are blocked; when IO is over-current, IO1 is increasing, the voltage drop of the current limiting resistor R3 makes T3 and T2 conducting, the VBE of T1 is falling ,which limits the IC1 of T1 and it also protects T1 from being broken of over current.



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