33_kW_SWITCHING

Published:2009/7/14 4:12:00 Author:May | From:SeekIC

Delco DTS-518 and DTS-519 power transistors in high-efficiency stacked supply are operated at 25-kHz switching rate to provide 330 VDC at 10 A. Control circuit operates at primary 50-kHz pulse frequency, with negative-going pulses having 2-μs duration. Flip-flop converts this to 25-kHz complementary square-wave signal driving Darlington DTS-2000s. Transformer cores are Magnetics EE No. 42510 each having 15-tum primary and 5-tum secondary for driving DTS-518s. Error amplifier compares portion of total output voltage to zener reference for control of DTS-519 power transistor switching at 25 kHz. Efficiency is 95% at full Ioad.- 3.3kW High Efficiency Switch Mode Regulator, Delco, Kokomo, IN, 1977, Application Note 59.



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