Extending_the_range_of_pnp_three_terminal_regulators

Published:2009/7/24 0:07:00 Author:Jessie | From:SeekIC

This circuit shows a way to extend the range of a pnp three-terminal regulator. The output voltage equals the regulator voltage plus the Zener voltage. If the Zener is selected to keep the input and ground-pin differential well below the IC breakdown, the input can exceed the maximum rating. For example, a 5-V three-terminal LM2931Z (maximum input 26 V) can become a 56-V regulator with a 51-V Zener. The input can be as low as 56.6 V with a load current of 150 mA or less.



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