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LM2596T-ADJ/LB05 Datasheet(PDF) 9 Page - Texas Instruments |
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LM2596T-ADJ/LB05 Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 42 page  LM2596 www.ti.com SNVS124C – NOVEMBER 1999 – REVISED APRIL 2013 Test Circuit and Layout Guidelines Fixed Output Voltage Versions CIN —470 μF, 50V, Aluminum Electrolytic Nichicon “PL Series” COUT —220 μF, 25V Aluminum Electrolytic, Nichicon “PL Series” D1 —5A, 40V Schottky Rectifier, 1N5825 L1 —68 μH, L38 Adjustable Output Voltage Versions 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 20. Standard Test Circuits and Layout Guides As in any switching regulator, layout is very important. Rapidly 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 inductor. Allowing the inductor flux to intersect sensitive feedback, lC groundpath and COUT 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 Information section for more information.) Copyright © 1999–2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM2596 |
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