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## LM2596T-ADJ Datasheet(PDF) 13 Page - National Semiconductor (TI)

 [Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
 No. de pieza LM2596T-ADJ Descripción Electrónicos SIMPLE SWITCHER Power Converter 150 kHz 3A Step-Down Voltage Regulator Download 31 Pages Scroll/Zoom 100% Fabricante Electrónico NSC [National Semiconductor (TI)] Página de inicio http://www.national.com Logo

## LM2596T-ADJ Datasheet(HTML) 13 Page - National Semiconductor (TI)

 13 / 31 pageLM2596 Series Buck Regulator Design Procedure (Adjustable Output)PROCEDURE (Adjustable Output Voltage Version)EXAMPLE (Adjustable Output Voltage Version)Given:VOUT = Regulated Output VoltageVIN(max) = Maximum Input VoltageILOAD(max) = Maximum Load CurrentF = Switching Frequency(Fixed at a nominal 150 kHz).Given:VOUT = 20VVIN(max) = 28VILOAD(max) = 3AF = Switching Frequency(Fixed at a nominal 150 kHz).1. Programming Output Voltage (Selecting R1 and R2,asshown inFigure 1 )Use the following formula to select the appropriate resistorvalues.Select a value for R1 between 240Ω and 1.5 kΩ. The lowerresistor values minimize noise pickup in the sensitive feed-back pin. (For the lowest temperature coefficient and the beststability with time, use 1% metal film resistors.)1. Programming Output Voltage (Selecting R1 and R2,asshown inFigure 1 )Select R1 to be 1 kΩ, 1%. Solve for R2.R2 = 1k (16.26 − 1) = 15.26k, closest 1% value is 15.4 kΩ.R2 = 15.4 kΩ.2. Inductor Selection (L1)A. Calculate the inductor Volt• microsecond constant E • T(V• µs), from the following formula:where VSAT = internal switch saturation voltage = 1.16Vand 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 inFigure 7.C. on the horizontal axis, select the maximum load current.D. Identify the inductance region intersected by the E• T valueand the Maximum Load Current value. Each region is identi-fied by an inductance value and an inductor code (LXX).E. Select an appropriate inductor from the four manufacturer’spart numbers listed inFigure 8.2. Inductor Selection (L1)A. Calculate the inductor Volt• microsecond constant(E• T),B. E• T = 34.2 (V • µs)C. ILOAD(max) = 3AD. From the inductor value selection guide shown inFigure 7,the inductance region intersected by the 34 (V• µs) horizontalline and the 3A vertical line is 47 µH, and the inductor code isL39.E. From the table inFigure 8, locate line L39, and select aninductor part number from the list of manufacturers part num-bers.www.national.com13

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