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參數資料
| 型號： | LP3893 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 3A Fast-Response Ultra Low Dropout Linear Regulators |
| 中文描述： | 第3A快速反應超低壓差線性穩(wěn)壓器 |
| 文件頁數： | 9/12頁 |
| 文件大小： | 342K |
| 代理商： | LP3893 |
Application Hints
(Continued)
HEATSINKING TO-220 PACKAGE
The thermal resistance of a TO220 package can be reduced
by attaching it to a heat sink or a copper plane on a PC
board. If a copper plane is to be used, the values of
θ
JA
will
be same as shown in next section for TO263 package.
The heatsink to be used in the application should have a
heatsink to ambient thermal resistance,
θ
HA
≤ θ
JA
θ
CH
θ
JC
.
In this equation,
θ
is the thermal resistance from the case
to the surface of the heat sink and
θ
is the thermal resis-
tance from the junction to the surface of the case.
θ
JC
is
about 3C/W for a TO220 package. The value for
θ
CH
de-
pends on method of attachment, insulator, etc.
θ
between 1.5C/W to 2.5C/W. If the exact value is unknown,
2C/W can be assumed.
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. The graph below 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.
20069725
FIGURE 1.
θ
JA
vs Copper (1 Ounce) Area for TO-263
package
L
www.national.com
9
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LP3893ES-1.2 | 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 負載調節(jié):0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LP3893ES-1.2/NOPB | 功能描述:低壓差穩(wěn)壓器 - LDO Dual-Rail 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 負載調節(jié):0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LP3893ES-1.5 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述:V REG LDO DR 3A 1.5V SMD TO-263-5 |
| LP3893ES-1.5/NOPB | 功能描述:IC REG LDO 1.5V 3A TO-263-5 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 產品變化通告:Heatsink Pkg Change 09/Oct/2007 標準包裝:50 系列:- 穩(wěn)壓器拓撲結構:正，固定式 輸出電壓:24V 輸入電壓:最高 40 V 電壓 - 壓降（標準）:2V @ 1A 穩(wěn)壓器數量:1 電流 - 輸出:1A 電流 - 限制（最?。?- 工作溫度:0°C ~ 125°C 安裝類型:通孔 封裝/外殼:TO-220-3 供應商設備封裝:TO-220-3 包裝:管件 |
| LP3893ES-1.8 | 制造商:Texas Instruments 功能描述:V REG LDO DR 3A 1.8V SMD TO-263-5 |
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