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LM2596T-ADJ Datasheet(PDF) 13 Page - National Semiconductor (TI) |
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LM2596T-ADJ Datasheet(HTML) 13 Page - National Semiconductor (TI) |
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13 / 31 page  LM2596 Series Buck Regulator Design Procedure (Adjustable Output) PROCEDURE (Adjustable Output Voltage Version) EXAMPLE (Adjustable Output Voltage Version) Given: V OUT = Regulated Output Voltage V IN(max) = Maximum Input Voltage I LOAD(max) = Maximum Load Current F = Switching Frequency (Fixed at a nominal 150 kHz). Given: V OUT = 20V V IN(max) = 28V I LOAD(max) = 3A F = Switching Frequency (Fixed at a nominal 150 kHz). 1. Programming Output Voltage (Selecting R 1 and R2,as shown in Figure 1 ) Use the following formula to select the appropriate resistor values. Select a value for R 1 between 240Ω and 1.5 kΩ. The lower resistor values minimize noise pickup in the sensitive feed- back pin. (For the lowest temperature coefficient and the best stability with time, use 1% metal film resistors.) 1. Programming Output Voltage (Selecting R 1 and R2,as shown in Figure 1 ) Select R 1 to be 1 kΩ, 1%. Solve for R2. R 2 = 1k (16.26 − 1) = 15.26k, closest 1% value is 15.4 kΩ. R 2 = 15.4 kΩ. 2. Inductor Selection (L1) A. Calculate the inductor Volt • microsecond constant E • T(V • µs), from the following formula: where V SAT = internal switch saturation voltage = 1.16V and V D = 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. C. on the horizontal axis, select the maximum load current. D. Identify the inductance region intersected by the E • T value and 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’s part numbers listed in Figure 8. 2. Inductor Selection (L1) A. Calculate the inductor Volt • microsecond constant (E • T), B. E • T = 34.2 (V • µs) C. I LOAD(max) = 3A D. From the inductor value selection guide shown in Figure 7, the inductance region intersected by the 34 (V • µs) horizontal line and the 3A vertical line is 47 µH, and the inductor code is L39. E. From the table in Figure 8, locate line L39, and select an inductor part number from the list of manufacturers part num- bers. www.national.com 13 |
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