DUAL_OUTPUT_500_kHz±15_V_DC_TO_DC_CONVERTER

Published:2009/7/13 2:11:00 Author:May | From:SeekIC

The LT1371 dual-output flyback converter circuit shown generates ±15 V at 200 mA each from a 5-V supply. The LT1371 is a 500-kHz high-efficiency switching regulator with 3-A power switch, yet it uses only 4 rnA typical quiescent current. The high operating frequency allows a small surfacemount, dual-output winding flyback transformer to be used. Each output is monitored by separate positive and negative feedback inputs on the LT1371 to be sure that neither output rises above its set point. This removes a common problem in dual-output designs using a single controller: the tendency of the voltage of the least loaded output to fly high. Output voltage regulation is best when both outputs are evenly loaded.



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