參數(shù)資料
型號： TS2940CZ3.3
廠商： Taiwan Semiconductor Co., Ltd.
英文描述： 40 Characters x 1 Lines, 5x7 Dot Matrix Character and Cursor
中文描述： 40 個(gè)字符 x 1 線、 5 x 7 點(diǎn)陣字符和光標(biāo)
文件頁數(shù)： 4/6頁
文件大小： 139K
代理商： TS2940CZ3.3
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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