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LNK302DN

更新时间： 2024-01-11 20:27:04
品牌 Logo 应用领域
帕沃英蒂格盛 - POWERINT 开关光电二极管
页数 文件大小 规格书
20页 712K
描述
LinkSwitch-TN Family Lowest Component Count, Energy-Effi cient Off-Line Switcher IC

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LNK302DN 技术参数

是否无铅：不含铅是否Rohs认证：符合
生命周期：Active零件包装代码：DIP
包装说明：DIP-8/7针数：8
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.39.00.01Factory Lead Time：14 weeks
风险等级：1.5Is Samacsys：N
其他特性：REQUIRES AN AC SUPPLY OF 85 TO 256V模拟集成电路 - 其他类型：SWITCHING REGULATOR
控制技术：PULSE WIDTH MODULATIONJESD-30 代码：R-PDIP-T8
JESD-609代码：e3长度：9.575 mm
功能数量：1端子数量：8
最高工作温度：125 °C最低工作温度：-40 °C
最大输出电流：0.2 A封装主体材料：PLASTIC/EPOXY
封装代码：DIP封装形状：RECTANGULAR
封装形式：IN-LINE峰值回流温度（摄氏度）：NOT SPECIFIED
认证状态：Not Qualified座面最大高度：3.68 mm
表面贴装：NO切换器配置：BUCK
最大切换频率：70 kHz温度等级：AUTOMOTIVE
端子面层：Matte Tin (Sn)端子形式：THROUGH-HOLE
端子节距：2.54 mm端子位置：DUAL
处于峰值回流温度下的最长时间：NOT SPECIFIED宽度：6.35 mm
Base Number Matches：1

LNK302DN 数据手册

 浏览型号LNK302DN的Datasheet PDF文件第5页浏览型号LNK302DN的Datasheet PDF文件第6页浏览型号LNK302DN的Datasheet PDF文件第7页浏览型号LNK302DN的Datasheet PDF文件第9页浏览型号LNK302DN的Datasheet PDF文件第10页浏览型号LNK302DN的Datasheet PDF文件第11页 
LNK302/304-306  
Pre-load Resistor R4  
Quick Design Checklist  
In high-side, direct feedback designs where the minimum load  
is <3 mA, a pre-load resistor is required to maintain output  
regulation. This ensures sufficient inductor energy to pull the  
inductor side of the feedback capacitor C3 to input return via  
D2. The value of R4 should be selected to give a minimum  
output load of 3 mA.  
As with any power supply design, all LinkSwitch-TN designs  
should be verified for proper functionality on the bench. The  
following minimum tests are recommended:  
1) Adequate DC rail voltage – check that the minimum DC  
inputvoltagedoesnotfallbelow70VDCatmaximumload,  
minimum input voltage.  
2) Correct Diode Selection – UF400x series diodes are  
recommended only for designs that operate in MDCM at  
an ambient of 70 °C or below. For designs operating in  
continuousconductionmode(CCM)and/orhigherambients,  
then a diode with a reverse recovery time of 35 ns or better,  
such as the BYV26C, is recommended.  
3) Maximum drain current – verify that the peak drain current  
is below the data sheet peak drain specification under  
worst-case conditions of highest line voltage, maximum  
overload (just prior to auto-restart) and highest ambient  
temperature.  
4) Thermal check – at maximum output power, minimum  
input voltage and maximum ambient temperature, verify  
that the LinkSwitch-TN SOURCE pin temperature is  
100 °C or below. This figure ensures adequate margin due  
to variations in RDS(ON) from part to part. Abattery powered  
thermocouplemeterisrecommendedtomakemeasurements  
whentheSOURCEpinsareaswitchingnode.Alternatively,  
the ambient temperature may be raised to indicate margin  
to thermal shutdown.  
In designs with an optocoupler the Zener or reference bias  
current provides a 1 mA to 2 mA minimum load, preventing  
“pulse bunching” and increased output ripple at zero load.  
LinkSwitch-TN Layout Considerations  
In the buck or buck-boost converter configuration, since the  
SOURCEpinsinLinkSwitch-TNareswitchingnodes,thecopper  
area connected to SOURCE should be minimized to minimize  
EMI within the thermal constraints of the design.  
In the boost configuration, since the SOURCE pins are tied  
to DC return, the copper area connected to SOURCE can be  
maximized to improve heatsinking.  
The loop formed between the LinkSwitch-TN, inductor (L1),  
freewheeling diode (D1), and output capacitor (C2) should  
be kept as small as possible. The BYPASS pin capacitor  
C1 (Figure 6) should be located physically close to the  
SOURCE (S) and BYPASS (BP) pins. To minimize direct  
coupling from switching nodes, the LinkSwitch-TN should be  
placed away from AC input lines. It may be advantageous to  
place capacitors C4 and C5 in-between LinkSwitch-TN and the  
AC input. The second rectifier diode D4 is optional, but may  
be included for better EMI performance and higher line surge  
withstand capability.  
InaLinkSwitch-TNdesignusingabuckorbuckboostconverter  
topology, the SOURCE pin is a switching node. Oscilloscope  
measurements should therefore be made with probe grounded  
to a DC voltage, such as primary return or DC input rail, and  
not to the SOURCE pins. The power supply input must always  
be supplied from an isolated source (e.g. via an isolation  
transformer).  
8
Rev. I 11/08  
1...567891011...20

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