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LM2576T-3.3 Arkusz danych(PDF) 10 Page - National Semiconductor (TI) |
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LM2576T-3.3 Arkusz danych(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 possible. Single-point grounding (as indicated) or ground plane con- struction 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 01147607 CIN — 100 µF, 75V, Aluminum Electrolytic COUT — 1000 µF, 25V, Aluminum Electrolytic D1 — Schottky, MBR360 L1 — 100 µH, Pulse Eng. PE-92108 R1 — 2k, 0.1% R2 — 6.12k, 0.1% Adjustable Output Voltage Version 01147608 where VREF = 1.23V, R1 between 1k and 5k. FIGURE 2. www.national.com 10 |
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