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| 型號： | TS2937CZ8 |
| 廠商： | Taiwan Semiconductor Co., Ltd. |
| 英文描述： | Monitors a steady state temperature and provides an alarm if the desired temperature measurement drops below the set point. |
| 中文描述： | 500mA的超低壓差固定正電壓穩(wěn)壓器 |
| 文件頁數(shù)： | 4/6頁 |
| 文件大?。?/td> | 152K |
| 代理商： | TS2937CZ8 |
TS2937
4-4
2003/12 rev. B
Application Information (continued)
T
R
(max) is calculated by the using to formula:
T
R
(max) = T
J
(max) – T
A
(max)
Where: T
J
(max) is the maximum allowable junction
temperature, which is 125
o
C for commercial
grade parts.T
A
(max) is the maximum ambient
temperature which will be encountered in the
application.
Using the calculated values for T
R
(max) and P
D
, the
maximum allowable value for the junction to ambient
thermal resistance,
θ
ja
, can now be found:
θ
ja
= T
R
(max) / P
D
IMPORTANT:
if the maximum allowable value for is
found to be
≥
60
o
C/W for the TO-220 package,
≥
80
o
C/W for the TO-263 package,
≥
150
o
C/W for the
TO-252 package, or
≥
170
o
C/W for the SOT-223
package, no heatsink is needed since the package
alone will dissipate enough heat to satisfy these
requirements. If the calculated value for
θ
ja
falls below
these limits, a heatsink is required.
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