155CMQ015
Bulletin PD-20.595 11/01
4
www.irf.com
Fig. 7 - Max. Non-Repetitive Surge Current (Per Leg)
Fig. 5 - Max. Allowable Case Temperature
Vs. Average Forward Current
Fig. 6 - Forward Power Loss
Characteristics
Average Forward Current - I
F(AV)
(A)
Allowable Case Temperature (°C)
Average Forward Current - I
F(AV)
(A)
Average Power Loss (Watts)
Square Wave Pulse Duration - t
p
(microsec)
Non-Repetitive Surge Current - I
FSM
(A)
(2)
Formula used: TC
= T
J
- (Pd + Pd
REV) x RthJC ;
Pd = Forward Power Loss = IF(AV)
x V
FM
@ (I
F(AV)
/ D) (see Fig. 6);
PdREV
= Inverse Power Loss = V
R1
x I
R
(1 - D); I
R
@ V
R1 = 5V
100
10 100 1000 10000
1000
10000
At Any Rated Load Condition
And With Rated Vrrm Applied
Following Surge
0
0 20 40 60 80 100 120
20
see note (2)
40
60
Square wave (D = 0.50)
80
100
120
140
DC
5V applied
0
10
20
30
40
50
0 20 40 60 80 100 120
D = 0.25DC
RMS Limit
D = 0.75
D = 0.50
D = 0.33
D = 0.20
DC
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