STGW40NC60V
6/10
Figure 15: Thermal Impedance
Figure 16: Turn-Off SOA
Figure 17: Ic vs Frequency
For a fast IGBT suitable for high frequency appli-
cations, the typical collector current vs. maximum
operating frequency curve is reported. That fre-
quency is defined as follows:
f
MAX
= (P
D
- P
C
) / (E
ON
+ E
OFF
)
1) The maximum power dissipation is limited by
maximum junction to case thermal resistance:
P
D
= ∆T / R
THJ-C
considering ∆T = T
J
- T
C
= 125 °C- 75 °C = 50°C
2) The conduction losses are:
P
C
= I
C
* V
CE(SAT)
* δ
with 50% of duty cycle, V
CESAT
typical value
@125°C.
3) Power dissipation during ON & OFF commuta-
tions is due to the switching frequency:
P
SW
= (E
ON
+ E
OFF
) * freq.
4) Typical values @ 125°C for switching losses are
used (test conditions: V
CE
= 390V, V
GE
= 15V,
R
G
= 3.3 Ohm). Furthermore, diode recovery en-
ergy is included in the E
ON
(see note 2), while the
tail of the collector current is included in the E
OFF
measurements (see note 3).
Obsolete Product(s) - Obsolete Product(s)
