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DF1117-5.0 Datasheet(PDF) 6 Page - List of Unclassifed Manufacturers

Part # DF1117-5.0
Description  DF1117
Download  9 Pages
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Manufacturer  ETC1 [List of Unclassifed Manufacturers]
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DF1117-5.0 Datasheet(HTML) 6 Page - List of Unclassifed Manufacturers

  DF1117-5.0 Datasheet HTML 1Page - List of Unclassifed Manufacturers DF1117-5.0 Datasheet HTML 2Page - List of Unclassifed Manufacturers DF1117-5.0 Datasheet HTML 3Page - List of Unclassifed Manufacturers DF1117-5.0 Datasheet HTML 4Page - List of Unclassifed Manufacturers DF1117-5.0 Datasheet HTML 5Page - List of Unclassifed Manufacturers DF1117-5.0 Datasheet HTML 6Page - List of Unclassifed Manufacturers DF1117-5.0 Datasheet HTML 7Page - List of Unclassifed Manufacturers DF1117-5.0 Datasheet HTML 8Page - List of Unclassifed Manufacturers DF1117-5.0 Datasheet HTML 9Page - List of Unclassifed Manufacturers  
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上海大缔微电子有限公司
DF1117
1A 低压差稳压器
6
of
6
图1.
VOUT = VRE F (1+ R2/R1)+IADJR2
图2. 典型可调整器
负载调整率
DF1117没有精确的负载偏差,是因为接在调整脚的电阻阻值限制了电路的标准。这个
规格说明书的数据从散热端测得(散热片和输出脚直接连在一起),由于散热片反馈到二极
管的负极,所以二极管的负极是一个精确的绝对温标。当
R1直接接地而不是接负载时,可
以得到最大的负载调整率。当
R1接负载时,接在调整端和负载之间的有效电阻是:
RP x ((R2+R1)/ R1),
RP =寄生线性阻抗
接法如下图所示
, R P不是分压比积分得到的。
* R1 接地
* R2接负载
F3.最高负载调整率连线图
在稳压器里
R1接内部的绝对温标,接地端可以作为二极管的负极接线端。
热设计
DF1117系列有一个内部电源和热限制电路,当电路超负荷运行时起到保护作用 ,但能
起作用的最大温度范围为
125°C 。结型周围热敏电阻的原始数据必需认真考虑 ,安装在
SOT-223表面的散热片也应认真考虑。芯片和铜皮的散热性能是利用散热片来实现的。 从
DF1117结型点到焊片的热敏电阻是15°C/W,从焊片到四周的热敏电阻是30°C/W,所以从


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