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LM2675EP Datasheet(PDF) 18 Page - National Semiconductor (TI) |
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LM2675EP Datasheet(HTML) 18 Page - National Semiconductor (TI) |
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18 / 25 page  LM2675EP Series Buck Regulator Design Procedure (Adjustable Output) (Continued) PROCEDURE (Adjustable Output Voltage Version) EXAMPLE (Adjustable Output Voltage Version) 2. Inductor Selection (L1) 2. Inductor Selection (L1) A. Calculate the inductor Volt • microsecond constant E • T(V • µs), from the following formula: A. Calculate the inductor Volt • microsecond constant (E • T), where V SAT = internal switch saturation voltage = 0.25V and VD = diode forward voltage drop = 0.5V B. Use the E • T value from the previous formula and match it with the E • T number on the vertical axis of the Inductor Value Selection Guide shown in Figure 7. B. E • T = 21.6 (V • µs) C. On the horizontal axis, select the maximum load current. C. I LOAD(max) = 1A D. Identify the inductance region intersected by the E • T value and the Maximum Load Current value. Each region is identified by an inductance value and an inductor code (LXX). D. From the inductor value selection guide shown in Figure 7, the inductance region intersected by the 21.6 (V • µs) horizontal line and the 1A vertical line is 68 µH, and the inductor code is L30. E. Select an appropriate inductor from the four manufacturer’s part numbers listed in Figure 8. For information on the different types of inductors, see the inductor selection in the fixed output voltage design procedure. E. From the table in Figure 8, locate line L30, and select an inductor part number from the list of manufacturers part numbers. 3. Output Capacitor Selection (C OUT) 3. Output Capacitor SeIection (C OUT) A. Select an output capacitor from the capacitor code selection guide in Figure 16. Using the inductance value found in the inductor selection guide, step 1, locate the appropriate capacitor code corresponding to the desired output voltage. A. Use the appropriate row of the capacitor code selection guide, in Figure 16. For this example, use the 15–20V row. The capacitor code corresponding to an inductance of 68 µH is C20. B. Select an appropriate capacitor value and voltage rating, using the capacitor code, from the output capacitor selection table in Figure 17. There are two solid tantalum (surface mount) capacitor manufacturers and four electrolytic (through hole) capacitor manufacturers to choose from. It is recommended that both the manufacturers and the manufacturer’s series that are listed in the table be used. A table listing the manufacturers’ phone numbers is located in Figure 11. B. From the output capacitor selection table in Figure 17, choose a capacitor value (and voltage rating) that intersects the capacitor code(s) selected in section A, C20. The capacitance and voltage rating values corresponding to the capacitor code C20 are the: Surface Mount: 33 µF/25V Sprague 594D Series. 33 µF/25V AVX TPS Series. Through Hole: 33 µF/25V Sanyo OS-CON SC Series. 120 µF/35V Sanyo MV-GX Series. 120 µF/35V Nichicon PL Series. 120 µF/35V Panasonic HFQ Series. Other manufacturers or other types of capacitors may also be used, provided the capacitor specifications (especially the 100 kHz ESR) closely match the characteristics of the capacitors listed in the output capacitor table. Refer to the capacitor manufacturers’ data sheet for this information. www.national.com 18 |
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