DEFINITION OF K FACTOR AND QRA1
dIR/dt
t1
0.5x IRR
IRR
QRA1 = 0.5x IRR(t1 + t2)
t2 k = t1/t2
τ
CURVES
3000
Measured under pulse conditions
2500
2000
Tj = 150˚C
Tj = 25˚C
1500
1000
500
0
2.0
4.0
6.0
8.0
Instantaneous forward voltage VF - (V)
Fig. 1 Maximum (limit) forward characteristics
DF685
3/8