LM2670

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SNVS036J – APRIL 2000 – REVISED APRIL 2013

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 LM2670 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 LM2670. 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.

Copyright © 2000–2013, Texas Instruments Incorporated

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