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參數(shù)資料
| 型號(hào)： | HDSP-253X |
| 英文描述： | Eight Character 5 mm Smart Alphanumeric Display |
| 中文描述： | 八字5毫米智能字符顯示 |
| 文件頁(yè)數(shù)： | 14/16頁(yè) |
| 文件大小： | 417K |
| 代理商： | HDSP-253X |
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14
I
DD
(V) = (54 x V
DD
-0.6 x T
J
) x B
x N/8
I
DD
(#) is the supply current
using “#” as the displayed
character.
I
DD
(V) is the supply current using
“V” as the displayed character.
T
J
is the IC junction temperature.
B is the percent brightness level.
N is the number of characters
illuminated.
Operation in high temperature
ambients may require power
derating or heatsinking. Figure 10
shows how to derate the power
for an HDSP-253X. You can
reduce the power by tighter
supply voltage regulation or
lowering the brightness level.
Table 3 shows the calculated
maximum allowable ambient
temperature for several different
sets of operating conditions. The
worst case alphanumeric
characters (#,@,B) have 20
pixels. Displaying eight 20-pixel
characters will not occur in
normal operation. Thus, using
eight 20-pixel characters to
calculate power dissipation will
over estimate the power and the
IC junction temperature. The
average number of pixels per
character, supply voltage,
brightness level, and number of
characters are needed to calculate
the power dissipated by the IC.
The ambient temperature, power
dissipated by the IC, and the
thermal resistance are then used
to calculate IC junction tempera-
ture. The typical alphanumeric
character is 15 pixels. For
conditions not listed in Table 3,
you can calculate the power
dissipated by the IC and use
Figure 10 to determine the
maximum ambient temperature.
Table 3. Maximum Allowable Ambient Temperature for Various Operating Conditions
AlGaAs Red
Number of
Characters
Brightness
Level
V
DD
V
I
DD
mA
P
D
W
R
θ
J-A
°
C/W
39
T
A
MAX
°
C
64
Character
# (20 dots)
8
100%
5.5
408
2.2
# (20 dots)
8
100%
5.25
387
2.0
39
72
# (20 dots)
8
100%
5.0
366
1.8
39
80
# (20 dots)
7
100%
5.5
357
2.0
39
72
# (20 dots)
6
100%
5.5
306
1.7
39
84
# (20 dots)
8
80%
5.5
327
1.8
39
80
# (20 dots)
8
80%
5.25
310
1.6
39
85
# (20 dots)
8
53%
5.5
216
1.2
39
85
V (12 dots)
8
100%
5.5
228
1.3
39
85
Figure 10. Maximum Allowable
Power Dissipation vs. Ambient
Temperature. T
J
MAX = 150
°
C or
120
°
C.
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