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LM2574 switch-mode power supply

LM2574 switch-mode power supply
If you are after a small, reliable and inexpensive switch-mode power supply, National Semiconductor's LM257x series of switch-mode power supply controller ICs has several advantages over competitive products like the LTI 070 (powerful but also more expensive) and the TL 497 (obsolescent). The LM157x family is second-sourced by Motorola.
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