AN2344

Datasheet avalanche ratings

19/27

Figure 14.

STP11NM60FP switch-OFF details

Figure 15.

STP11NM60FP switch-ON details

Note:

That the peak current before the turn OFF, that in this case is 4.8A, should be taken into

account as very worst case for avalanche in case of a higher dV/dt, but also in this last case,

the specification is satisfied.

Average power is calculated as follows:

Equation 16

Equation 17

Note:

For the conduction losses, the worst case of a triangular power shape is considered, even if

the right one should not be.

Equation 18

A quick way to calculate the maximum temperature during the avalanche is to add the peak

temperature due to the avalanche pulse to the average temperature:

P

AVE

t

AV

T

--------0.5

P

PEAK AV

()

t

COND

T

----------------

+

•

0.5

P

PEAK COND

()

•

t

ON

T

---------0.5

P

PEAK ON

()

•

+

=

+

t

OFF

T

-----------0.5

P

PEAK OFF

()

•

+

P

AVE

8.77

1.73

0.43

1.68

12.61W

=

+++

=

T

J

P

T

CASE

45

° C70° C115° C

=

+

=

+

=