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LM2673S-ADJ Datasheet(PDF) 10 Page - National Semiconductor (TI) |
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LM2673S-ADJ Datasheet(HTML) 10 Page - National Semiconductor (TI) |
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10 / 26 page  Application Hints (Continued) DESIGN CONSIDERATIONS Power supply design using the LM2673 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 LM2673. A simple design procedure using nomographs and component tables pro- vided 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 compari- son of component specifications, equivalent devices from other manufacturers could be substituted for use in an ap- plication. Important considerations for each external component and an explanation of how the nomographs and selection tables were developed follows. INDUCTOR The inductor is the key component in a switching regulator. For efficiency the inductor stores energy during the switch ON time and then transfers energy to the load while the switch is OFF. Nomographs are used to select the inductance value re- quired for a given set of operating conditions. The nomo- graphs assume that the circuit is operating in continuous mode (the current flowing through the inductor never falls to zero). The magnitude of inductance is selected to maintain a 10091323 FIGURE 1. Basic circuit for fixed output voltage applications. 10091324 FIGURE 2. Basic circuit for adjustable output voltage applications www.national.com 10 |
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