TRANSISTOR_INCREASES_ZENER_RATING

Published:2009/6/28 21:28:00 Author:May | From:SeekIC

The simple zener shunt in A may not handle sufficient current if the zener available is of low wattage. A power transistor will do most of the work for the zener as shown in B. Once the zener starts conducting, a bias voltage develops across the resistor (330 Ω to 1K), turning on the transistor. The output voltage is 0.7 V greater than the zener voltage.



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