參數(shù)資料
型號: LP3856
廠商: National Semiconductor Corporation
英文描述: 3A Fast Response Ultra Low Dropout Linear Regulators
中文描述: 第3A快速響應(yīng)超低壓差線性穩(wěn)壓器
文件頁數(shù): 15/18頁
文件大?。?/td> 417K
代理商: LP3856
Application Hints
(Continued)
HEATSINKING TO-263 PACKAGE
The 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 5
shows a curve for the
θ
JA
of 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.
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 TO-263 package mounted to a PCB is
32C/W.
Figure 6
shows the maximum allowable power dissipation
for TO-263 packages for different ambient temperatures,
assuming
θ
JA
is 35C/W and the maximum junction tempera-
ture is 125C.
20030932
FIGURE 5.
θ
JA
vs Copper (1 Ounce) Area for TO-263
package
20030933
FIGURE 6. Maximum power dissipation vs ambient
temperature for TO-263 package
L
www.national.com
15
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LP3856-ADJ 制造商:NSC 制造商全稱:National Semiconductor 功能描述:3A Fast Response Ultra Low Dropout Linear Regulators
LP3856ES-1.8 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓(最大值):307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
LP3856ES-1.8/NOPB 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓(最大值):307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
LP3856ES-2.5 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓(最大值):307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
LP3856ES-2.5/NOPB 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓(最大值):307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20