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## LM2675EP Datasheet(PDF) 18 Page - National Semiconductor (TI)

 [Old version datasheet] Texas Instruments acquired National semiconductor.
 Part No. LM2675EP Description Enhanced Plastic SIMPLE SWITCHER Power Converter High Efficiency 1A Step-Down Voltage Regulator Download 25 Pages Scroll/Zoom 100% Manufacturer NSC [National Semiconductor (TI)] Direct Link http://www.national.com Logo

## LM2675EP Datasheet(HTML) 18 Page - National Semiconductor (TI)

 18 / 25 pageLM2675EP 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 VSAT = internal switch saturation voltage = 0.25V and VD= diode forward voltage drop = 0.5VB. Use the E• T value from the previous formula and match itwith the E• T number on the vertical axis of the Inductor ValueSelection Guide shown in Figure 7.B. E• T = 21.6 (V • µs)C. On the horizontal axis, select the maximum load current.C. ILOAD(max) = 1AD. Identify the inductance region intersected by the E• T valueand the Maximum Load Current value. Each region is identifiedby 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) horizontalline and the 1A vertical line is 68 µH, and the inductor code isL30.E. Select an appropriate inductor from the four manufacturer’spart numbers listed in Figure 8. For information on the differenttypes of inductors, see the inductor selection in the fixed outputvoltage design procedure.E. From the table in Figure 8, locate line L30, and select aninductor part number from the list of manufacturers partnumbers.3. Output Capacitor Selection (COUT)3. Output Capacitor SeIection (COUT)A. Select an output capacitor from the capacitor code selectionguide in Figure 16. Using the inductance value found in theinductor selection guide, step 1, locate the appropriate capacitorcode corresponding to the desired output voltage.A. Use the appropriate row of the capacitor code selectionguide, in Figure 16. For this example, use the 15–20V row. Thecapacitor 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 selectiontable 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 thatboth the manufacturers and the manufacturer’s series that arelisted 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 thecapacitor code(s) selected in section A, C20.The capacitance and voltage rating values corresponding to thecapacitor code C20 are the:Surface Mount:33 µF/25VSprague 594D Series.33 µF/25VAVX TPS Series.Through Hole:33 µF/25VSanyo OS-CON SC Series.120 µF/35VSanyo MV-GX Series.120 µF/35VNichicon PL Series.120 µF/35VPanasonic HFQ Series.Other manufacturers or other types of capacitors may also beused, provided the capacitor specifications (especially the 100kHz ESR) closely match the characteristics of the capacitorslisted in the output capacitor table. Refer to the capacitormanufacturers’ data sheet for this information.www.national.com18

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