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LM2596 Datasheet(PDF) 9 Page - National Semiconductor (TI) |
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LM2596 Datasheet(HTML) 9 Page - National Semiconductor (TI) |
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9 / 31 page  Test Circuit and Layout Guidelines (Continued) 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, external 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 associated 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.) Adjustable Output Voltage Versions 01258323 where VREF = 1.23V Select R1 to be approximately 1 kΩ, use a 1% resistor for best stability. CIN — 470 µF, 50V, Aluminum Electrolytic Nichicon “PL Series” COUT — 220 µF, 35V Aluminum Electrolytic, Nichicon “PL Series” D1 — 5A, 40V Schottky Rectifier, 1N5825 L1 — 68 µH, L38 R1 — 1 k Ω,1% CFF — See Application Information Section FIGURE 1. Standard Test Circuits and Layout Guides www.national.com 9 |
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