参数资料
型号: LP3875ESX-ADJ/NOPB
厂商: National Semiconductor
文件页数: 11/20页
文件大小: 0K
描述: IC REG LDO ADJ 1.5A TO263-5
标准包装: 500
稳压器拓扑结构: 正,可调式
输出电压: 可调
输入电压: 2.5 V ~ 7 V
电压 - 压降(标准): 0.38V @ 1.5A
稳压器数量: 1
电流 - 输出: 1.5A(最小值)
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: TO-263-6,D²Pak(5 引线+接片),TO-263BA
供应商设备封装: TO-263-5
包装: 带卷 (TR)
其它名称: LP3875ESX-ADJ
LP3875ESX-ADJ-ND
LP3875ESX-ADJ/NOPBTR
SNVS247D – SEPTEMBER 2003 – REVISED APRIL 2013
In this equation, θ CH is the thermal resistance from the case to the surface of the heat sink and θ JC is the thermal
resistance from the junction to the surface of the case. θ JC is about 3°C/W for a TO-220 package. The value for
θ CH depends on method of attachment, insulator, etc. θ CH varies between 1.5°C/W to 2.5°C/W. If the exact value
is unknown, 2°C/W can be assumed.
HEATSINKING DDPAK/TO-263 PACKAGE
The DDPAK/TO-263 package uses the copper plane on the PCB as a heatsink. The tab of these packages are
soldered to the copper plane for heat sinking. Figure 17 shows a curve for the θ JA of DDPAK/TO-263 package for
different copper area sizes, using a typical PCB with 1 ounce copper and no solder mask over the copper area
for heat sinking.
Figure 17. θ JA vs Copper (1 Ounce) Area for DDPAK/TO-263 Package
As shown in the figure, increasing the copper area beyond 1 square inch produces very little improvement. The
minimum value for θ JA for the DDPAK/TO-263 package mounted to a PCB is 32°C/W.
Figure 18 shows the maximum allowable power dissipation for DDPAK/TO-263 packages for different ambient
temperatures, assuming θ JA is 35°C/W and the maximum junction temperature is 125°C.
Figure 18. Maximum Power Dissipation vs Ambient Temperature for DDPAK/TO-263 Package
HEATSINKING SOT-223-5 PACKAGE
Figure 19 shows a curve for the θ JA of SOT-223 package for different copper area sizes, using a typical PCB with
1 ounce copper and no solder mask over the copper area for heat sinking.
Copyright ? 2003–2013, Texas Instruments Incorporated
Product Folder Links: LP3875-ADJ
11
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