For more information, please refer to the following application notes related to the power losses :

•

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

P

(W)

F(AV)

T

δ=tp/T

tp

I

(A)

F(A V)

δ = 1

δ = 0.1

δ = 0.5

δ = 0.2

δ = 0.05

0.0

0.2

0.4

0.6

0.8

1.0

1.2

0.50

0.45

0.40

0.35

0.30

0.25

0.20

0.15

0.10

0.05

0.00

Figure 2. Average forward current versus ambient

temperature (δ = 0.5)

0

1

2

3

4

5

6

0

25

50

75

100

125

150

I

(A)

F(AV)

T

δ=tp/T

tp

(°C)

Tam

th(j-a) R

b

SMA

R

= th(j-l)

SMB

Figure 3. Normalized avalanche power derating versus

junction temperature (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 ambient versus pulse duration (SMB)

Z

/ R

th(j-a)

th(j-a)

0.01

0.10

1.00

1.E-03

1.E-02

1.E-01

1.E+00

1.E+01

1.E+02

1.E+03

Single pulse

SMB

t (s)

p

STPS1L30

Characteristics (curves)

DS1243 - Rev 8

page 3/15