參數(shù)資料
型號(hào)： LM3205
廠商： National Semiconductor Corporation
元件分類： DC/DC變換器
英文描述： 650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers
中文描述： 六百五十零毫安微型，可調(diào)，降壓型DC - DC轉(zhuǎn)換器的射頻功率放大器
文件頁(yè)數(shù)： 16/18頁(yè)
文件大?。?/td> 1285K
代理商： LM3205
Board Layout Considerations
(Continued)
3.
Above layout patterns should be placed on the compo-
nent side of the PCB to minimize parasitic inductance
and resistance due to via-holes. It may be a good idea
that the SW to L1 path is routed between C2(+) and
C2(-) land patterns. If vias are used in these large cur-
rent paths, multiple via-holes should be used if possible.
Connect C1(-), C2(-) and PGND with wide GND pattern.
This pattern should be short, so C1(-), C2(-), and PGND
should be as close as possible. Then connect to a PCB
common GND pattern with as many via-holes as pos-
sible.
4.
5.
SGND should not connect directly to PGND. Connecting
these pins under the device should be avoided. (If pos-
sible, connect SGND to the common port of C1(-), C2(-)
and PGND.)
V
should not be connected directly to PV
. Connect-
ing these pins under the device should be avoided. It is
good idea to connect V
DD
to the C1(+) to avoid switching
noise injection to the V
DD
line.
FB line should be protected from noise. It is a good idea
to use an inner GND layer (if available) as a shield.
6.
7.
BOARD LAYOUT FLOW (LLP)
1.
Minimize C1, PV
, and PGND loop. These traces
should be as wide and short as possible. This is most
important.
2.
Minimize L1, C2, SW and PGND loop. These traces also
should be wide and short. This is the second priority.
3.
Above layout patterns should be placed on the compo-
nent side of the PCB to minimize parasitic inductance
and resistance due to via-holes. It may be a good idea
that the SW to L1 path is routed between C2(+) and
C2(-) land patterns. If vias are used in these large cur-
rent paths, multiple via-holes should be used if possible.
4.
Connect C1(-), C2(-) and PGND with wide GND pattern.
This pattern should be short, so C1(-), C2(-), and PGND
should be as close as possible. Then connect to a PCB
common GND pattern with as many via-holes as pos-
sible.
5.
SGND should connect directly to PGND through a single
common via as close to C1 as possible. Connecting
these pins under the LLP device on a different layer
should be avoided.
V
should not be connected directly to PV
. Connect-
ing these pins under the device should be avoided. It is
good idea to connect V
DD
to the C1(+) to avoid switching
noise injection to the V
DD
line.
FB line should be protected from noise. It is a good idea
to use an inner GND layer (if available) as a shield.
Note:
The evaluation board shown in
Figure 5
and
Figure 6
for the LM3205TL/
LM3205SD were designed with these considerations, and it shows
good performance. However some aspects have not been optimized
because of limitations due to evaluation-specific requirements. The
board can be used as a reference, but it is not the best. Please refer
questions to a National representative.
6.
7.
20158032
FIGURE 6. Evaluation Board for LLP
L
www.national.com
16
相關(guān)PDF資料
PDF描述
LM3205SD-2 650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers
LM3205SDX-2 650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers
LM3205TL 650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers
LM3205TLX 650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers
LM325H Dual Voltage Regulator
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM320-5 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC
LM3205_09 制造商:NSC 制造商全稱:National Semiconductor 功能描述:650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers
LM3205SD-2 制造商:NSC 制造商全稱:National Semiconductor 功能描述:650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers
LM3205SD-2/NOPB 功能描述:DC/DC 開(kāi)關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
LM3205SDX-2 制造商:NSC 制造商全稱:National Semiconductor 功能描述:650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*