MBRS320

Bulletin PD-20645 rev. D 03/03

4

www.irf.com

Fig. 5 - Maximum Average Forward Current

Vs. Allowable Lead Temperature

Fig. 6 - Maximum Average Forward Dissipation

Vs. Average Forward Current

Fig. 7 - Maximum Peak Surge Forward Current Vs. Pulse Duration

(2) Formula used: T

C

= T

J

- (Pd + Pd

REV

) x R

thJC

;

Pd = Forward Power Loss = I

F(AV)

x V

FM

@ (I

D) (see Fig. 6);

Pd

REV

= Inverse Power Loss = V

R1

x I

R

(1 - D)

Average Forward Current - I

F(AV)

(A)

Average Forward Current - I

F(AV)

(A)

Square Wave Pulse Duration - t

p

(microsec)

120

125

130

135

140

145

150

155

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5

DC

see note (2)

Square wave

D = 0.20

D = 0.25

D = 0.33

D = 0.50

D = 0.75

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

01

234

5

DC

RMS Limit

D = 0.20

D = 0.25

D = 0.33

D = 0.50

D = 0.75

10

100

1000

10

100

1000

10000

Tj = 25˚C

At Any Rated Load Condition

And With Rated Vrrm Applied

Following Surge