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参数资料
| 型号： | LM2670TADJEP |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 5.4 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, PZFM7 |
| 封装： | PLASTIC, TO-220, 7 PIN |
| 文件页数： | 3/25页 |
| 文件大小： | 465K |
| 代理商： | LM2670TADJEP |
Application Hints (Continued)
DESIGN CONSIDERATIONS
Power supply design using the LM2670EP is greatly simpli-
fied by using recommended external components. A wide
range of inductors, capacitors and Schottky diodes from
several manufacturers have been evaluated for use in de-
signs that cover the full range of capabilities (input voltage,
output voltage and load current) of the LM2670EP. 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 calcula-
tions 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
20097707
FIGURE 1. Basic circuit for fixed output voltage applications.
20097708
FIGURE 2. Basic circuit for adjustable output voltage applications
LM2670EP
Enhanced
Plastic
www.national.com
11
相关PDF资料 |
PDF描述 |
|---|---|
| LM2670T-5.0EP | 5.4 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, PZFM7 |
| LM2670S-12EP | 5.4 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, PSSO7 |
| LM2670SD-5.0EP | 5.4 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, PDSO14 |
| LM2670SD-3.3EP | 5.4 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, PDSO14 |
| LM2670T-12EP | 5.4 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, PZFM7 |
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