Infineon EVALIGBT1200V247TOBO1, User Manual, Page: 15 / 27

Application Note 15 Revision 1.0
2017-11-15
1200V HighSpeed 3 IGBT in TO-247PLUS Evaluation Board
User Manual
Examples
4
Examples
After the in-depth explanation of possible test settings and procedures that were provided in the previous
section, this section shows two practical examples: a switching loss and a temperature measurement.
4.1
Turn-on loss reduction with a 4pin package
As extensively explained in [2] on the basis of 650V
TRENCHSTOP™ 5 IGBTs, the main advantage of
four-pin packages over three-pin packages is the reduction of turn-on losses, particularly at higher
current levels. The reason for that is the virtual elimination of the inductive coupling between the gate
and the commutation loop. This section demonstrates the positive impact of the Kelvin Emitter
connection, i.e. the fourth pin, on 1200V/75A HighSpeed 3 IGBTs. Table 4 summarizes the test cases.
Table 4 Turn-on loss comparison of TO-247PLUS 3pin and 4pin: test conditions
Solution 1 Solution 2
Part number (IGBT and diode) IKQ75N120CH3 IKY75N120CH3
Package
TO-247PLUS TO-247PLUS 4pin
Junction temperature T
j
=T
c
25°C 25°C
Switched voltage V
CE
800V 800V
Switched current I
C
5A-80A 5A-80A
Gate voltages V
GE(on)
+15V +15V
Gate resistors R
G(on)
10
Ω
10
Ω
Driver Ground Connection
0
Ω at R214 and R224
0
Ω at R213 and R223
The evaluation board was set up as explained in section 3.2.2. Following the recommendations in
section 2.2, current measurements were made using a coaxial shunt and voltage probes were connected
via PCB adapters. Figure 10.a shows the evaluation board and the measurement hardware as the main
part of the setup
– power supplies and the signal generator are not included in the picture.
(a) (b)
Figure 10 Turn-on loss comparison of TO-247PLUS 3pin and 4pin: (a) main parts of the test
setup, (b) absolute and relative comparison of the measured losses
By multiplying V
CE
and I
C
on the oscilloscope the waveform of the momentary power dissipation was
calculated. Integration of this power waveform resulted in the turn-on energy values E
on
which are shown
in Figure 10.b for different current levels and for both package variants. It is clearly visible that the
switching losses can be significantly reduced by going to a 4pin package. Since the Kelvin Emitter is
increasing di/dt, this is particularly true for higher current levels.