250_V_AT_3_A

Published:2009/7/14 4:52:00 Author:May | From:SeekIC

Single high-voltage silicon power transistor al serves as series element in switching regulator, with regulation obtained by pulse-width modulation. Delco DTS-431 pro-vides output of 250 V for maximum input of 325 V; other Delco transistors in same series give different combinations of output voltage and current in range of 300-750 W maximum output power. Efficiency is 92% at full load. Differential amplifier Q2-Q3 senses output voltage of regulator and feeds Schmitt trigger Q4-Q5 for turning series transistor al on and off. Resulting square wave of voltage is smoothed by LC filter between Q1 and load.- Pulse Width Modulated Switching Regulator, Delco, Kokomo, IN, 1972, Application Note 39, p 3.



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