SIMULTANEOUS_CURRENT_LIMITING

Published:2009/7/19 20:53:00 Author:Jessie | From:SeekIC

Limiting action of circuit depends on output current of positive regulator but acts simultaneously on both positive and negative outputs of National LM125 dual tracking regulator. Positive output current produces voltage drop across R1 that makesQ1conduct. When increase in current makes voltage drop across R2 equal negative current limit sense voltage, negative regulator will current-limit. Positive regulator closely follows negative output down to level of about 700 mV.Q2 turns off negative pass transistor during simultaneous current limiting. Output voltages are ±15V.- Linear Applications, Vol. 2, National Semiconductor, Santa Clara, CA, 1976, AN-82, p 12-13.



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