Datasheet

DocID15917 Rev 6 23/33
VNL5050N3-E, VNL5050S5-E Package and PC board thermal data
32
Figure 25. SO-8 thermal impedance junction ambient single pulse
Equation 3: pulse calculation formula
where δ = t
P
/T
Figure 26. Thermal fitting model of a LSD in SO-8
1. The fitting model is a semplified thermal tool and is valid for transient evolutions where the embedded
protections (power limitation or thermal cycling during thermal shutdown) are not triggered.
0.1
1
10
100
1000
0.0001 0.001 0.01 0.1 1 10 100 1000
Time (s)
ZTH (°C/W)
Cu=footprint
Cu=2 cm2
Z
THδ
R
TH
δ Z
THtp
1 δ–()+Þ=