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LM2676S-5.0 参数 Datasheet PDF下载

LM2676S-5.0图片预览
型号: LM2676S-5.0
PDF下载: 下载PDF文件 查看货源
内容描述: SIMPLE SWITCHER高效率3A降压型稳压器 [SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator]
分类和应用: 稳压器
文件页数/大小: 25 页 / 451 K
品牌: NSC [ National Semiconductor ]
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Application Hints (Continued)  
DESIGN CONSIDERATIONS  
10091407  
FIGURE 1. Basic circuit for fixed output voltage applications.  
10091408  
FIGURE 2. Basic circuit for adjustable output voltage applications  
Power supply design using the LM2676 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 LM2676. 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.  
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  
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-  
11  
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