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VARIABLE_REFERENCE

2015-03-20 18:12  
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VARIABLE_REFERENCE
With 759 power opamp used as variable-output voltage regulator, output voltage can be varied over full range from zener maximum down to zero by varying voltage from zener. With 791 opamp, voltage can be adjusted down to 2 V. Since output voltage can be less than zener rating, simple boot- 68V strapping cannot be used. Alternate biasing techniques are then required to improve line regulation. Arrangement is capable of supplying several hundred milliamperes while using only low-drift (5 PPM/℃) zener.-R. J. Apfel, Power Op Amps-Their Innovative Circuits and Packaging Provide Designers with More 0ptions, EDN Magazine, Sept. 5, 1977, p 141-144.