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參數(shù)資料
| 型號(hào)： | LM883K |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 3-Terminal Adjustable Regulator |
| 中文描述： | 三端可調(diào)穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 9/25頁(yè) |
| 文件大?。?/td> | 697K |
| 代理商： | LM883K |
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Application Hints
(Continued)
when
either
the input or output is shorted. Internal to the
LM117 is a 50
resistor which limits the peak discharge
current. No protection is needed for output voltages of 25V
or less and 10μF capacitance.
Figure 3
shows an LM117
with protection diodes included for use with outputs greater
than 25V and high values of output capacitance.
When a value for
θ
(HA)
is found using the equation shown,
a heatsink must be selected that has a value that is less than
or equal to this number.
θ
(HA)
is specified numerically by the heatsink manufacturer
in the catalog, or shown in a curve that plots temperature rise
vs power dissipation for the heatsink.
HEATSINKING TO-263, SOT-223 AND TO-252 PACKAGE
PARTS
The TO-263 (“S”), SOT-223 (“MP”) and TO-252 (”DT”) pack-
ages use a copper plane on the PCB and the PCB itself as
a heatsink. To optimize the heat sinking ability of the plane
and PCB, solder the tab of the package to the plane.
Figure 4
shows for the TO-263 the measured values of
θ
for different copper area sizes using a typical PCB with 1
ounce copper
and no solder mask over the copper area used
for heatsinking.
As shown in the figure, increasing the copper area beyond 1
square inch produces very little improvement. It should also
be observed that the minimum value of
θ
(JA)
for the TO-263
package mounted to a PCB is 32C/W.
As a design aid,
Figure 5
shows the maximum allowable
power dissipation compared to ambient temperature for the
TO-263 device (assuming
θ
is 35C/W and the maxi-
mum junction temperature is 125C).
Figure 6
and
Figure 7
show the information for the SOT-223
package.
Figure 7
assumes a
θ
of 74C/W for 1 ounce
copper and 51C/W for 2 ounce copper and a maximum
junction temperature of 125C.
00906307
D1 protects against C1
D2 protects against C2
FIGURE 3. Regulator with Protection Diodes
00906355
FIGURE 4.
θ
(JA)
vs Copper (1 ounce) Area for the
TO-263 Package
00906356
FIGURE 5. Maximum Power Dissipation vs T
AMB
for
the TO-263 Package
L
www.national.com
9
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM883W | 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:Operational Amplifier |
| LM8850 | 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:Evaluation Board Application Note working demonstration |
| LM8850URE/NOPB | 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| LM8850UREV/NOPB | 功能描述:BOARD EVAL LM8850 RoHS:是 類(lèi)別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - DC/DC 與 AC/DC（離線）SMPS 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:DC/DC，步降 輸出及類(lèi)型:1，非隔離 功率 - 輸出:- 輸出電壓:3.3V 電流 - 輸出:3A 輸入電壓:4.5 V ~ 28 V 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):降壓 頻率 - 開(kāi)關(guān):250kHz 板類(lèi)型:完全填充 已供物品:板 已用 IC / 零件:L7981 其它名稱(chēng):497-12113STEVAL-ISA094V1-ND |
| LM8850URX/NOPB | 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 High-Perf,Step-Up DC-DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
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