STP120NF04 Electrical characteristics
9/14
The previous curve gives the safe operating area for unclamped inductive loads, single
pulse or repetitive, under the following conditions:
P
D(AVE)
=0.5*(1.3*BV
DSS
*I
AV
)
E
AS(AR)
=P
D(AVE)
*t
AV
Where:
I
AV
is the allowable current in avalanche
P
D(AVE)
is the average power dissipation in avalanche (single pulse)
t
AV
is the time in avalanche
To derate above 25 °C, at fixed I
AV,
the following equation must be applied:
I
AV
= 2 * (T
jmax
- T
CASE
) / (1.3 * BV
DSS
* Z
th
)
Where:
Z
th
= K * R
th
is the value coming from Normalized Thermal Response at fixed pulse width
equal to T
AV
.
Figure 17. Allowable Iav vs time in avalanche
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