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參數(shù)資料
| 型號： | TS2940CZ5.0 |
| 廠商： | Taiwan Semiconductor Co., Ltd. |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 5.0 AMP POSITIVE VOLTAGE REGULATOR |
| 中文描述： | 5.0放大器正電壓穩(wěn)壓器 |
| 文件頁數(shù)： | 4/6頁 |
| 文件大小： | 139K |
| 代理商： | TS2940CZ5.0 |
TS2940
4-6
2003/12 rev. B
Application Information (continued)
The next parameter which must be calculated is the
maximum allowable temperature rise, T
R
(max). this 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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