Extending_high_voltage_three_terminal_regulator_capability

Published:2009/7/24 4:46:00 Author:Jessie | From:SeekIC

This circuit delivers 100 V at 100 mA and withstands shorts to ground. When an output short occurs, the zener conducts, forcing the Q1 base to 30 V. The Q1 emitter clamps 2 VBE below VZ, well within the VIN/VOUT regulator rating. Q1 sustains 90 VCE at whatever current the transformer and regulator current limit will support. If the regulator and Q1 are thermally coupled, the regulator goes into thermal shutdown and protects the load and regulator as long as the output is shorted.



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