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LM2596 Datasheet(PDF) 7 Page - Estek Electronics Co. Ltd |
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LM2596 Datasheet(HTML) 7 Page - Estek Electronics Co. Ltd |
7 / 12 page TEST CIRCUIT AND LAYOUT GUIDELINES Figure 1. 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. + L1 C OUT + C IN 2 3 4 5 +V IN + L1 + Fixed Output Voltage Versions C - 470 F,50V,Aluminum Electrolytic Nichicon “PL Series” IN µ C - 220 F,25V,Aluminum Electrolytic Nichicon “ PL Series” D1 - 5A,40V Schottky Rectifer,1N5825 L1 - 68 H,L38 OUT µ µ + L1 C OUT + C IN 2 3 4 5 +V IN + R1 R2 C FF Adjustable Output Voltage Versions Select R1 to be approximately 1 C - 470 F,50V,Aluminum Electrolytic Nichicon “PL Series” IN µ k,use a1% resistor for best stability. C - 220 F,35V,Aluminum Electrolytic Nichicon “ PL Series” D1 - 5A,40V Schottky Rectifer,1N5825 L1 - 68 H,L38 R1 - 1k ,1% C - see Application Information Section Ω µ µ Ω OUT FF V=V (1+ ) OUT REF R = R ( -1) 21 where V = 1.23V REF V V OUT REF R R 2 1 7 BEIJING ESTEK ELECTRONICS CO.,LTD LM2596 3AStep-Down VoltageRegulator |
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