STCS05 STMicroelectronics, STCS05 Datasheet - Page 11

• Manufacturer Part Number: STCS05
• Description: 1.5A MAX CONSTANT CURRENT LED DRIVER
• Manufacturer: STMicroelectronics

Figure 12. Maximum power dissipation vs T
In this case V
P
The junction temperature will be:
T
The following pictures show the maximum power dissipation according to the ambient
temperature:
J
D
= 100 x 0.391 + 50 = 89 °C.
= (1.2 - 0.1) x 0.35 + 12 x 0.5 x 10
1.40
1.40
1.20
1.20
1.00
1.00
0.80
0.80
0.60
0.60
0.40
0.40
0.20
0.20
25
25
DRAIN
P
P
DMAX
DMAX
35
35
= 12 - 3 x 3.6 = 1.2 V
= (T
= (T
45
45
JMAX
JMAX
55
55
-T
-T
A
A
A
)/R
)/R
65
65
for SO-8
-3
thJA
thJA
= 0.385 + 6 x 10
[°C]
[°C]
75
75
85
85
R
R
thJA
thJA
95
95
-3
= 100 [°C/W]
= 100 [°C/W]
= 391 mW
105
105
115
115
125
125
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