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, Dlf provides the dc reference for operational amplifier Ul, whose other input is obtained from a fraction of the output voltage. Ul drives Q3, which drives the gate of Q2. Foldback current limiting is achieved by Rl, R2, R3, R4, Ql, and D2.
HV Regulator with Foldback current limiting Circuit Digram
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