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參數(shù)資料
| 型號： | LM2637MWC |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, UUC |
| 封裝： | WAFER |
| 文件頁數(shù)： | 8/20頁 |
| 文件大?。?/td> | 404K |
| 代理商： | LM2637MWC |
Applications Information (Continued)
1.
Try to use 2 oz. copper for the ground plane if tight load
regulation is desired. In the case of dynamic voltage po-
sitioning, this may not be a concern because the loose
load regulation is desired anyway. However, do not for-
get to take into consideration the voltage drop caused by
the ground plane when calculating dynamic voltage po-
sitioning parameters.
2.
Try to keep gate drive traces short. However, do not
make them too short or else the LM2637 may be placed
too close to the FETs and get heated up by them. For the
same reason, do not use wide traces, 10 mil traces
should be enough.
3.
When not employing dynamic voltage positioning, place
the feedback point at the VRM connector pins so as to
have a tight load regulation. If it is an embedded power
supply, place the feedback point at Slot I connector or
wherever closest to the MPU.
4.
Start component placement with the power devices such
as FETs, and inductors.
5.
Do not place the LM2637 directly underneath the FETs
(on the other side of the PCB) when surface mount FETs
are used. Also try to avoid staying too close to the output
inductor, especially when using an open core inductor.
6.
If possible, keep the capacitors some distance away
from the inductors and FET heatsinks so that the capaci-
tors will have a better thermal environment. Keep in
mind that the input capacitors are usually much hotter
than output capacitors.
7.
When
implementing
dynamic
voltage
positioning
through a PCB trace, keep in mind that the PCB trace is
a heat source and try to avoid placing the trace directly
underneath the LM2637.
8.
Try to place a ceramic capacitor as close as possible to
the V
DD pin.
9.
If it is a MPU core supply, try to place the output bulk ca-
pacitors fairly close to the MPU for lower inductance.
www.national.com
16
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| LM2638M | 制造商:Texas Instruments 功能描述: |
| LM2638M/NOPB | 功能描述:IC MOTHERBRD PWR SUPPLY 24-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 應(yīng)用說明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件 |
| LM2638MX | 功能描述:IC MOTHERBRD PWR SUPPLY 24-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 應(yīng)用說明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件 |
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