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STCS05A データシート(PDF) 13 Page - STMicroelectronics

部品番号 STCS05A
部品情報  0.5 A max constant current LED driver
PDF  18 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STCS05A データシート(HTML) 13 Page - STMicroelectronics

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STCS05A
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In this case VDRAIN = 12 - 3 x 3.6 = 1.2 V
PD = (1.2 - 0.1) x 0.35 + 12 x 0.5 x 10
-3 = 0.385 + 6 x 10-3 = 391 mW
The junction temperature will be:
TJ = 100 x 0.391 + 50 = 89 °C
For a correct operation of the chip, the junction temperature must not exceed 110 °C.
The following pictures show the maximum power dissipation according to the ambient
temperature:
Figure 16.
Maximum power dissipation vs TA for SO-8
0.20
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[°C]
R
thJA = 100 [°C/W]
P
DMAX = (TJMAX-TA)/RthJA
0.20
0.40
0.60
0.80
1.00
1.20
1.40
25
35
45
55
65
75
85
95
105
115
125
[°C]
R
thJA = 100 [°C/W]
P
DMAX = (TJMAX-TA)/RthJA



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