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LM2598T-12 Arkusz danych(PDF) 10 Page - National Semiconductor (TI) |
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LM2598T-12 Arkusz danych(HTML) 10 Page - National Semiconductor (TI) |
10 / 33 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.) LM2598 Series Buck Regulator Design Procedure (Fixed Output) PROCEDURE (Fixed Output Voltage Version) EXAMPLE (Fixed Output Voltage Version) Given: Given: V OUT = Regulated Output Voltage (3.3V, 5V or 12V) V OUT =5V V IN(max) = Maximum DC Input Voltage V IN(max) = 12V I LOAD(max) = Maximum Load Current I LOAD(max) = 1A 1. Inductor Selection (L1) 1. Inductor Selection (L1) A. Select the correct inductor value selection guide from Figures Figure 4, Figure 5,or Figure 6 (Output voltages of 3.3V, 5V, or 12V respectively.) For all other voltages, see the design procedure for the adjustable version. A. Use the inductor selection guide for the 5V version shown in Figure 5. B. From the inductor value selection guide, identify the in- ductance region intersected by the Maximum Input Voltage line and the Maximum Load Current line. Each region is identified by an inductance value and an inductor code (LXX). B. From the inductor value selection guide shown in Figure 5, the inductance region intersected by the 12V horizontal line and the 1A vertical line is 68 µH, and the inductor code is L30. C. Select an appropriate inductor from the four manufactur- er’s part numbers listed in Figure 8. C. The inductance value required is 68 µH. From the table in Figure 8, go to the L30 line and choose an inductor part number from any of the four manufacturers shown. (In most instance, both through hole and surface mount inductors are available.) 2. Output Capacitor Selection (C OUT) 2. Output Capacitor Selection (C OUT) A. In the majority of applications, low ESR (Equivalent Series Resistance) electrolytic capacitors between 47 µF and 330 µF and low ESR solid tantalum capacitors between 56 µF and 270 µF provide the best results. This capacitor should be located close to the IC using short capacitor leads and short copper traces. Do not use capacitors larger than 330 µF. For additional information, see section on output capaci- tors in application information section. A. See section on output capacitors in application infor- mation section. www.national.com 10 |
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