參數(shù)資料
型號(hào)： LM2678
廠商： National Semiconductor Corporation
英文描述： SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator
中文描述： 高效率的SIMPLE SWITCHER第5A降壓穩(wěn)壓器
文件頁(yè)數(shù)： 14/27頁(yè)
文件大?。?/td> 459K
代理商： LM2678
Application Hints
(Continued)
The switching frequency of 260KHz is the nominal value to
use to estimate the ON time of the switch during which
energy is stored in the inductor.
For this example E
T is found to be:
Using
Figure 6
, the intersection of 27V
μS horizontally and
the 3.5A vertical line (I
max) indicates that L48 , a 47μH
inductor, or L49, a 33μH inductor could be used. Either
inductor will be suitable, but for this example selecting the
larger inductance will result in lower ripple current.
From Table 1, L48 in a surface mount component is available
from Pulse Engineering with part number P0848.
Step 4:
Use Table 6 to determine an output capacitor. With a
14.8V output the 12.5 to 15V row is used and with a 47μH
inductor there are three surface mount output capacitor so-
lutions. Table 2 provides the actual capacitor characteristics
based on the C Code number. Any of the following choices
can be used:
1 x 33μF/20V AVX TPS (code C6)
1 x 47μF/20V Sprague 594 (code C8)
1 x 47μF/20V Kemet T495 (code C8)
Important Note:
When using the adjustable device in low
voltage applications (less than 3V output), if the nomograph,
Figure 6, selects an inductance of 22μH or less, Table 6 does
not provide an output capacitor solution. With these condi-
tions the number of output capacitors required for stable
operation becomes impractical. It is recommended to use
either a 33μH or 47μH inductor and the output capacitors
from Table 6.
L
www.national.com
14
相關(guān)PDF資料
PDF描述
LM2679S-12 SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit
LM2679S-3.3 SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit
LM2679S-5.0 SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit
LM2679T-12 392 Series Industrial Potentiometer, Conductive Plastic Element, PC Terminals, 0.5 W Power Rating, 250 Ohm Resistance Value
LM2679T-3.3 392 Series Industrial Potentiometer, Conductive Plastic Element, PC Terminals, 0.5 W Power Rating, 2.5 kOhm Resistance Value
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM2678_05 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER㈢ High Efficiency 5A Step-Down Voltage Regulator
LM2678-12 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator
LM2678-3.3 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator
LM2678-5.0 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator
LM2678-ADJ 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator
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