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LM2574HVM-ADJ Datasheet(PDF) 10 Page - National Semiconductor (TI) |
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LM2574HVM-ADJ Datasheet(HTML) 10 Page - National Semiconductor (TI) |
10 / 24 page Test Circuit and Layout Guidelines As in any switching regulator, layout is very important. Rap- idly switching currents associated with wiring inductance generate voltage transients which can cause problems. For minimal inductance and ground loops, the length of the leads indicated by heavy lines should be kept as short as pos- sible. Single-point grounding (as indicated) or ground plane construction should be used for best results. When using the Adjustable version, physically locate the programming resis- tors near the regulator, to keep the sensitive feedback wiring short. Fixed Output Voltage Versions DS011394-11 CIN — 22 µF, 75V Aluminum Electrolytic COUT — 220 µF, 25V Aluminum Electrolytic D1 — Schottky, 11DQ06 L1 — 330 µH, 52627 (for 5V in, 3.3V out, use 100 µH, RL-1284-100) R1 — 2k, 0.1% R2 — 6.12k, 0.1% Adjustable Output Voltage Version DS011394-12 FIGURE 2. www.national.com 10 |
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