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ST eto nawernoe Semtech, no delo po-moemu ne w firme a w tom shto LM2576-5 (NS = National Semiconductor)rabotaet s "fixed voltage" na wyxode, a u LM2576-adj wyxodnoe naprjagenie "ajustable" (iswinite, ne snaju kak po-russki) i, esli ja ne oshibajus, sxema ego wkljuchenija slegka drugaja. Wot posmotrite datasheet:
http://www.freetradezone.com/dc_images/63/55/D2746355.pdf
ili sdes:
http://www.freetradezone.com/dc_images/37/52/D0083752.pdf
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