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LM2595 Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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LM2595 Datasheet(HTML) 8 Page - National Semiconductor (TI) |
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8 / 29 page  Test Circuit and Layout Guidelines As in any switching regulator, layout is very important. Rap- idly switching currents associated with wiring inductance can generate voltage transients which can cause problems. For minimal inductance and ground loops, the wires indicated by heavy lines should be wide printed circuit traces and should be kept as short as possible. For best results, ex- ternal components should be located as close to the switcher lC as possible using ground plane construction or single point grounding. If open core inductors are used, special care must be taken as to the location and positioning of this type of induc- tor. Allowing the inductor flux to intersect sensitive feedback, lC groundpath and C OUT wiring can cause problems. When using the adjustable version, special care must be taken as to the location of the feedback resistors and the as- sociated wiring. Physically locate both resistors near the IC, and route the wiring away from the inductor, especially an open core type of inductor. (See application section for more information.) Fixed Output Voltage Versions DS012565-22 CIN — 120 µF, 50V, Aluminum Electrolytic Nichicon “PL Series” COUT — 120 µF, 25V Aluminum Electrolytic, Nichicon “PL Series” D1 — 3A, 40V Schottky Rectifier, 1N5822 L1 — 100 µH, L29 Adjustable Output Voltage Versions DS012565-23 CIN — 120 µF, 50V, Aluminum Electrolytic Nichicon “PL Series” COUT — 120 µF, 25V Aluminum Electrolytic, Nichicon “PL Series” D1 — 3A, 40V Schottky Rectifier, 1N5822 L1 — 100 µH, L29 R1 —1 kΩ,1% CFF — See Application Information Section FIGURE 1. Standard Test Circuits and Layout Guides www.national.com 8 |
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