Datasheet

ILD4035
350 mA Step Down LED Driver
Thermal Characteristics
Data Sheet 12 Revision 2.0, 2011-08-17
4 Thermal Characteristics
Figure 2 Total Power Dissipation
Equation (1) is gives an estimation for the power dissipation of ILD4035.
(1)
Table 3 Maximum Thermal Resistance
Parameter Symbol Values Unit Note /
Test Condition
Min. Typ. Max.
Junction - soldering point
1)
1) For calculation of R
thJA
please refer to application note AN077 (Thermal Resistance Calculation)
R
thJS
––65K/W–
0
0.2
0.4
0.6
0.8
1
1.2
0 20 40 60 80 100 120 140 160
P
tot
[W]
T
S
[°C]
mA
I
µWfcycledutyIVP
LED
SwitchLEDtot
350
11.1 ⋅⋅+⋅⋅=