•

AN604: Calculation of conduction losses in a power rectifier

•

AN4021: Calculation of reverse losses on a power diode

1.1

Characteristics (curves)

Figure 1. Average forward power dissipation versus

average forward current

0

2

4

6

8

10

12

14

16

18

20

22

24

26

0

4

8

12

16

20

24

28

32

36

=0.05

=0.1

= 0.2

=0.5

=1

T

=t /T

p

tp

PF(AV)(W)

δ

δ

δ

δ

δ

δ

IF(AV)(A)

Figure 2. Average forward current versus ambient

temperature (δ = 0.5, TO-220AB)

0

5

10

15

20

25

30

35

0

25

50

75

100

125

150

Rth(j-a)=Rth(j-c)

Rth(j-a)=15°C/W

T

=tp/T

tp

T

(°C)

amb

IF(AV)(A)

δ

Figure 3. Normalized avalanche power derating versus

pulse duration (Tj = 125 °C)

P

(tp)

P

(10 µs)

ARM

ARM

0.001

0.01

0.1

1

1

10

100

1000

t (µs)

p

Figure 4. Relative variation of thermal impedance junction

to case versus pulse duration (TO-220AB)

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.E-03

1.E-02

1.E-01

1.E+00

Single pulse

Zth(j-c) /Rth(j-c)

tp(s)

TO-220AB

STPS30M100S

Characteristics (curves)

DS6171 - Rev 4

page 3/11