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參數(shù)資料
| 型號(hào)： | LM883E |
| 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： | LM883E |
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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) |
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| LM883HVK | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:3-Terminal Adjustable Negative Regulators (High Voltage) |
| LM883HVKSTL | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:3-Terminal Adjustable Regulator |
| LM883J | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low Power Quad Operational Amplifiers |
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