Larger current steady voltage circuit with current limit

Published:2011/4/17 8:07:00 Author:Nicole | Keyword: larger current, steady voltage, current limit | From:SeekIC

In figure, the choice of resistances R1 and R2 should meet the condition of R2≧5*R1. Such as R1=0.2Ω, R2=1Ω. In practice, according to the current, R1 should be between 0.1~2Ω, because of UBE=UD, then UR1=UR2, so I2 is lower than 5 times of I3, total current I1=I2+I3≈I4, neglecting the base current of transistor, then I3 is equal to the adjustment current of integrated circuit IC. For large current transistor, the resistance R3 can be selected between 10~20Ω. For small current transistor, the resistance can be choiced of 100Ω.



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