Output current expanding circuit

Published:2011/7/8 5:49:00 Author:Christina | Keyword: Output current, expanding | From:SeekIC

When the needed current is larger than the maximum output current of the voltage stabilizer, you can expand the output current by using the high-power transistor, the circuit is as shown in the figure. In this figure, VT is the high-power semiconductor transistor, you need to choose the semiconductor transistor according to the maximum current which needs to be expanded. The resistance value of the R1 can be decided by this formula: In the formula: VBE--Positive pressure drop of transistor BE, the Ge transistor is 0.3V, the Silicon transistor is 0.7V;IR--Output current of the three-port integrated voltage stabilizer;Ir--Output current of the power transistor, Ir=i. -iR.β--Amplification coefficient of the power transistor. The circuit uses the powertransistor to expend the output current



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