The High Voltage Regulator Circuit Diagram delivers 100-V at 100 mA and withstands shorts to
ground. Even at 100 V output, the LT317A functions in the normal mode,
maintaining 1.2 V between its output and adjustment pin. Under these
conditions, the 30-V zener is off and Ql conducts. When an output short
occurs, the zener conducts, forcing Q1`s base to 30 V.
This causes Q1`s
emitter to clamp 2 VnEs below Vz. well within the V.w VouT rating of
the regulator. Under these conditions, Q1, a high-voltage device, sustains 90
V-VcE at whatever current the transformer specified saturates at 130
mA, while Q1 safely dissipates 12 W. If Q1 and the LT317 A are
thermally coupled, the regulator will soon go into thermal shutdown and
oscillation will commence.
This action will continue, protecting the
load and the regulator as long as the output remains shorted. The
500-pF capacitor and the 10 0/0.02 11F damper aid transient response and
the diodes provide safe discharge paths for the capacitors.
High Voltage Regulator Circuit Diagram
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