IRFB4115PbF
5 www.irf.com © 2014 International Rectifier Submit Datasheet Feedback November 11, 2014
Fig 13. Maximum Effective Transient Thermal Impedance, Junction-to-Case
1E-006 1E-005 0.0001 0.001 0.01 0.1
t
1
, Rectangular Pulse Duration (sec)
0.0001
0.001
0.01
0.1
1
T
h
e
r
m
a
l
R
e
s
p
o
n
s
e
(
Z
t
h
J
C
)
°
C
/
W
0.20
0.10
D = 0.50
0.02
0.01
0.05
SINGLE PULSE
( THERMAL RESPONSE )
Notes:
1. Duty Factor D = t1/t2
2. Peak Tj = P dm x Zthjc + Tc
Ri (°C/W) τi (sec)
0.245 0.0059149
0.155 0.0006322
τ
J
τ
J
τ
1
τ
1
τ
2
τ
2
R
1
R
1
R
2
R
2
τ
C
τ
C
Ci = τi/Ri
Ci= τi/Ri
Fig 14. Typical Avalanche Current vs.Pulsewidth
1.0E-06 1.0E-05 1.0E-04 1.0E-03 1.0E-02
tav (sec)
0.1
1
10
100
1000
A
v
a
l
a
n
c
h
e
C
u
r
r
e
n
t
(
A
)
Allowed avalanche Current vs avalanche
pulsewidth, tav, assuming
∆Τ
j = 25°C and
Tstart = 150°C.
Allowed avalanche Current vs avalanche
pulsewidth, tav, assuming
∆
Tj = 150°C and
Tstart = 25°C (Single Pulse)