- 您现在的位置：买卖IC网 > PDF目录67755 > LM10506TME (NATIONAL SEMICONDUCTOR CORP) 1-CHANNEL POWER SUPPLY SUPPORT CKT, PBGA34 PDF资料下载
参数资料
| 型号： | LM10506TME |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PBGA34 |
| 封装： | 0.40 MM PITCH, MICRO SMD-34 |
| 文件页数： | 25/34页 |
| 文件大小： | 1020K |
| 代理商： | LM10506TME |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页当前第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页
22.0 PCB Layout Considerations
PC board layout is an important part of DC-DC converter de-
sign. Poor board layout can disrupt the performance of a DC-
DC converter and surrounding circuitry by contributing to EMI,
ground bounce, and resistive voltage loss in the traces. These
can send erroneous signals to the DC-DC converter resulting
in poor regulation or instability. Good layout can be imple-
mented by following a few simple design rules.
30166225
FIGURE 8. Schematic of LM10506 Highlighting Layout Sensitive Nodes
1.
Minimize area of switched current loops. In a buck
regulator there are two loops where currents are
switched rapidly. The first loop starts from the C
IN input
capacitor, to the regulator SWx_VIN pin, to the regulator
SW pin, to the inductor then out to the output capacitor
C
OUT and load. The second loop starts from the output
capacitor ground, to the regulator SWx_GND pins, to the
inductor and then out to C
OUT and the load (see figure
above). To minimize both loop areas the input capacitor
should be placed as close as possible to the VIN pin.
Grounding for both the input and output capacitors
should consist of a small localized top side plane that
connects to PGND. The inductor should be placed as
close as possible to the SW pin and output capacitor.
2.
Minimize the copper area of the switch node. The SW
pins should be directly connected with a trace that runs
on top side directly to the inductor. To minimize IR losses
this trace should be as short as possible and with a
sufficient width. However, a trace that is wider than 100
mils will increase the copper area and cause too much
capacitive loading on the SW pin. The inductors should
be placed as close as possible to the SW pins to further
minimize the copper area of the switch node.
3.
Have a single point ground for all device analog grounds.
The ground connections for the feedback components
should be connected together then routed to the GND pin
of the device. This prevents any switched or load currents
from flowing in the analog ground plane. If not properly
handled, poor grounding can result in degraded load
regulation or erratic switching behavior.
4.
Minimize trace length to the FB pin. The feedback trace
should be routed away from the SW pin and inductor to
avoid contaminating the feedback signal with switch
noise.
5.
Make input and output bus connections as wide as
possible. This reduces any voltage drops on the input or
output of the converter and can improve efficiency. If
voltage accuracy at the load is important make sure
feedback voltage sense is made at the load. Doing so will
correct for voltage drops at the load and provide the best
output accuracy.
31
www.national.com
LM10506
相关PDF资料 |
PDF描述 |
|---|---|
| LM10506TMX-A | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PBGA34 |
| LM122H/883 | RECTANGULAR, TIMER, MBCY10 |
| LM122H/883B | RECTANGULAR, TIMER, MBCY10 |
| LM12438CIWMX | SPECIALTY ANALOG CIRCUIT, PDSO28 |
| LM12434CIWMX | SPECIALTY ANALOG CIRCUIT, PDSO28 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LM10506TME/NOPB | 功能描述:直流/直流开关转换器 Triple Buck & LDO Power Mgmt Unit RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| LM10506TME-A | 制造商:TI 制造商全称:Texas Instruments 功能描述:Triple Buck LDO Power Management Unit |
| LM10506TME-A/NOPB | 功能描述:直流/直流开关转换器 Triple Buck & LDO Power Mgmt Unit RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| LM10506TMX | 制造商:TI 制造商全称:Texas Instruments 功能描述:Triple Buck LDO Power Management Unit |
| LM10506TMX/NOPB | 功能描述:PMIC 解决方案 Triple Buck & LDO Power Mgmt Unit RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。