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## LM2671 Datasheet(PDF) 21 Page - Texas Instruments

 Part No. LM2671 Description LM2671 SIMPLE SWITCHER짰 Power Converter High Efficiency 500-mA Step-Down Voltage Regulator With Features Download 36 Pages Scroll/Zoom 100% Manufacturer TI1 [Texas Instruments] Direct Link http://www.ti.com Logo

## LM2671 Datasheet(HTML) 21 Page - Texas Instruments

 21 / 36 page21LM2671www.ti.comSNVS008L – SEPTEMBER 1998 – REVISED JUNE 2016Product Folder Links: LM2671Submit Documentation FeedbackCopyright © 1998–2016, Texas Instruments Incorporated9.2.2.1 Design RequirementsTable 7 lists the design parameters for this example.Table 7. Design ParametersPARAMETERVALUERegulated output voltage, VOUT20 VMaximum input voltage, VIN(max)28 VMaximum load current, ILOAD(max)500 mASwitching frequency, FFixed at a nominal 260 kHz9.2.2.2 Detailed Design Procedure9.2.2.2.1Programming Output VoltageSelect R1 and R2, as shown in Figure 21.Use the following formula to select the appropriate resistor values.where•VREF = 1.21 V(3)Select R1 to be 1 kΩ, 1%. Solve for R2.(4)Select a value for R1 between 240 Ω and 1.5 kΩ. The lower resistor values minimize noise pickup in the sensitivefeedback pin. For the lowest temperature coefficient and the best stability with time, use 1% metal film resistors.(5)R2 = 1 kΩ (16.53 − 1) = 15.53 kΩ, closest 1% value is 15.4 kΩ.R2 = 15.4 kΩ.9.2.2.2.2Inductor Selection (L1)1. Calculate the inductor Volt • microsecond constant E • T (V • μs) from Equation 6.where•VSAT = internal switch saturation voltage = 0.25 V•VD = diode forward voltage drop = 0.5 V(6)Calculate the inductor Volt • microsecond constant (E • T) with Equation 7.(7)2. Use the E • T value from the previous formula and match it with the E • T number on the vertical axis of theinductor value selection guide shown in Figure 20.E • T = 21.6 (V • μs)(8)3. On the horizontal axis, select the maximum load current in Equation 9.ILOAD(max) = 500 mA(9)4. Identify the inductance region intersected by the E • T value and the maximum load current value. Eachregion is identified by an inductance value and an inductor code (LXX). From the inductor value selectionguide shown in Figure 20, the inductance region intersected by the 21.6 (V • μs) horizontal line and the 500-mA vertical line is 100 μH, and the inductor code is L20.5. Select an appropriate inductor from the four manufacturer's part numbers listed in Table 2. For information

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