HV regulator with foldback current limiting

Posted on Dec 11, 2012

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.

HV regulator with foldback current limiting
Click here to download the full size of the above Circuit.

Foldback current limiting is achieved by Rl, R2, R3, R4, Ql, and D2.

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