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LM2671 Datasheet(PDF) 27 Page - Texas Instruments

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

LM2671 Datasheet(HTML) 27 Page - Texas Instruments

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LM2671
www.ti.com
SNVS008L – SEPTEMBER 1998 – REVISED JUNE 2016
Product Folder Links: LM2671
Submit Documentation Feedback
Copyright © 1998–2016, Texas Instruments Incorporated
11 Layout
11.1 Layout Guidelines
Layout is very important in switching regulator designs. Rapidly switching currents associated with wiring
inductance can generate voltage transients which can cause problems. For minimal inductance and ground
loops, the wires indicated by heavy lines (in Figure 15 and Figure 21) must be wide printed-circuit traces and
must be kept as short as possible. For best results, external components must be placed as close to the switcher
IC as possible using ground plane construction or single point grounding.
If open core inductors are used, take special care as to the location and positioning of this type of inductor.
Allowing the inductor flux to intersect sensitive feedback, IC ground path, and COUT wiring can cause problems.
When using the adjustable version, take special care as to the location of the feedback resistors and the
associated wiring. Physically place both resistors near the IC, and route the wiring away from the inductor,
especially an open core type of inductor.
11.2 Layout Examples
CIN = 15-μF, 25-V Solid Tantalum Sprague, 594D series
COUT = 68-μF, 10-V Solid Tantalum Sprague, 594D series
D1 = 1-A, 40-V Schottky Rectifier, surface mount
L1 = 47-μH, L13 Coilcraft DO3308
CB = 0.01-μF, 50-V ceramic
Figure 27. Typical Surface Mount PCB Layout, Fixed Output (4x Size)
CIN = 15 μF, 50 V Solid Tantalum Sprague, 594D series
COUT = 33 μF, 25 V Solid Tantalum Sprague, 594D series
D1 = 1-A, 40-V Schottky Rectifier, surface mount
L1 = 100-μH, L20 Coilcraft DO3316
CB = 0.01-μF, 50-V ceramic
R1 = 1 k
Ω, 1%
R2 = Use formula in Detailed Design Procedure
Figure 28. Typical Surface Mount PCB Layout, Adjustable Output (4x Size)


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