參數(shù)資料
型號(hào)： LM2676LD-5.0
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： 5.4 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, DSO14
封裝： LLP-14
文件頁(yè)數(shù)： 6/25頁(yè)
文件大小： 435K
代理商： LM2676LD-5.0
Application Hints (Continued)
Using Figure 6, the intersection of 27V
S horizontally and
the 2A vertical line (I
load max) indicates that L38 , a 68H
inductor, should be used.
From Table 1, L38 in a surface mount component is available
from Pulse Engineering with part number PE-54038S.
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 68H
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 33F/20V AVX TPS (code C6)
1 x 47F/20V Sprague 594 (code C8)
1 x 47F/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 22H 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 33H or 47H inductor and the output capacitors
from Table 6.
Step 5: An input capacitor for this example will require at
least a 35V WV rating with an rms current rating of 1A (1/2
Iout max). From Table 2 it can be seen that C12, a 33F/35V
capacitor from Sprague, has the required voltage/current
rating of the surface mount components.
Step 6: From Table5a3A Schottky diode must be selected.
For surface mount diodes with a margin of safety on the
voltage rating one of five diodes can be used:
SK34
30BQ040
30WQ04F
MBRS340
MBRD340
Step 7: A 0.01F capacitor will be used for Cboost.
LLP Package Devices
The LM2676 is offered in the 14 lead LLP surface mount
package to allow for a significantly decreased footprint with
equivalent power dissipation compared to the TO-263. For
details on mounting and soldering specifications, refer to
Application Note AN-1187.
LM2676
www.national.com
14
相關(guān)PDF資料
PDF描述
LM2676LD-3.3 5.4 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, DSO14
LM2676LDX-12 5.4 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, DSO14
LM2682MWC SWITCHED CAPACITOR CONVERTER, 15 kHz SWITCHING FREQ-MAX, UUC
LM2711MT-ADJ/NOPB 1.4 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO20
LM285AH-2.5 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.5 V, MBCY2
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM2676LD-ADJ 制造商:Rochester Electronics LLC 功能描述:3A STEP DOWN SIMP SWITCH 260KH - Bulk 制造商:Texas Instruments 功能描述:
LM2676LDX-ADJ 制造商:Rochester Electronics LLC 功能描述:3A STEP DOWN SIMP SWITCH 260KH - Bulk 制造商:Texas Instruments 功能描述:
LM2676S12 制造商:National Semiconductor 功能描述:Conv DC-DC Single Step Down 8V to 40V 8-Pin(7+Tab) TO-263 Rail
LM2676S-12 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
LM2676S-12/NOPB 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 HIGH EFF 3A STEP- DOWN VLTG REG RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
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