HV REGULATOR WITH FOLDBACK CURRENT LIMITING

  
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A 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 t
HV REGULATOR WITH FOLDBACK CURRENT LIMITING - schematic

he 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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