HV_REGULATOR_WITH_FOLDBACK_CURRENT_LIMITING

Published:2009/7/2 4:57:00 Author:May | From:SeekIC

Circuit NotesA TMOS MTM7N45 (Q2) is used as a series pass element in a linear high voltage supply that accepts +275-V unregulated and produces 250 V regulated with foldback current limiting.A 15-V zener, D1, provides the dc reference for operational amplifier U1, whose other input is obtained from a fraction of the output voltage. UI drives Q3, which drives the gate of Q2. Foldback current limiting is achieved by RI, R2, R3, R4, Q1, and D2. The formula to estab!ish the current knee for limiting is:



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