50WQ10FN
Bulletin PD-20526 rev. E 03/03
150
Allowable Case T
emperature - (°C)
5.5
5
Average Power Loss - (Watts)
D = 0.20
D = 0.25
D = 0.33
D = 0.50
D = 0.75
RMSLimit
DC
145
DC
140
135
130
125
see note (2)
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
S
quare wave (D = 0.50)
80% Rated V
R
applied
120
0
1
2
3
4
5
6
7
8
Average Forward Current - I
F(AV)
(A)
0
1
2
3
4
5
6
7
8
Average Forward Current - I
F(AV)
(A)
Fig. 5 - Maximum Allowable Case Temperature
Vs. Average Forward Current
1000
Fig. 6 - Forward Power Loss Characteristics
Non-R
epetitive S
urge Current - I
FSM
(A)
At Any Rated Load Condition
And With Rated V
RRM
Applied
Following S
urge
100
10
100
1000
10000
S
quare Wave Pulse Duration - t p (microsec)
Fig. 7 - Maximum Non-Repetitive Surge Current
(2)
Formula used: T
C
= T
J
- (Pd + Pd
REV
) x R
thJC
;
Pd = Forward Power Loss = I
F(AV)
x V
FM
@ (I
F(AV)
/
D) (see Fig. 6);
Pd
REV
= Inverse Power Loss = V
R1
x I
R
(1 - D); I
R
@ V
R1
= 80% rated V
R
4
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