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LM2678SD-12 데이터시트(PDF) 10 Page - Texas Instruments

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부품명 LM2678SD-12
상세설명  LM2678 SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator
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LM2678
SNVS029I – MARCH 2000 – REVISED APRIL 2013
www.ti.com
DESIGN CONSIDERATIONS
Figure 19. Basic Circuit for Fixed Output Voltage Applications.
Figure 20. Basic Circuit for Adjustable Output Voltage Applications
Power supply design using the LM2678 is greatly simplified by using recommended external components. A wide
range of inductors, capacitors and Schottky diodes from several manufacturers have been evaluated for use in
designs that cover the full range of capabilities (input voltage, output voltage and load current) of the LM2678. A
simple design procedure using nomographs and component tables provided in this data sheet leads to a working
design with very little effort. Alternatively, the design software, LM267X Made Simple (version 6.0), can also be
used to provide instant component selection, circuit performance calculations for evaluation, a bill of materials
component list and a circuit schematic.
The individual components from the various manufacturers called out for use are still just a small sample of the
vast array of components available in the industry. While these components are recommended, they are not
exclusively the only components for use in a design. After a close comparison of component specifications,
equivalent devices from other manufacturers could be substituted for use in an application.
Important considerations for each external component and an explanation of how the nomographs and selection
tables were developed follows.
10
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