Toshiba TLP7820, Reference Manual

Page: 5 / 19

RD014-RGUIDE-01
2018-03-15
Rev. 1
5 / 19
© 2018
Toshiba Electronic Devices & Storage Corporation
Figure 2.1 shows an example of a test circuit for measuring the output waveform with a common-
mode voltage (V
CM
) applied.
Figure 2.1 Example of a test circuit for measuring the output waveform with a
common-mode voltage (V
CM
) applied
An inverter contains discrete IGBT (or IGBT module) with a collector-emitter voltage (V
CE
) of
600 to 650V or 1200V. The 600V to 650V IGBTs are generally used at a supply voltage of 400V,
and 1200V IGBTs are commonly used at 800V. Typically, IGBTs have rise and fall times (t
r
and
t
f
) of roughly 100ns when switching. Under these conditions, the slew rate (dV/dt) of V
CM
is
calculated to be 4kV/μs at a supply voltage of 400V and 8kV/μs at 800V. Figure 2.2 shows
examples of output waveforms of the TLP7820 when common-mode voltages (V
CM
) with 4-kV/μs
and 8-kV/μs slew rates are applied. As shown in Figure 2.2, V
OUT
does not have much noise,
which proves that the TLP7820 has enough CMTI performance to apply actual applications.
A
）
When dV/dt = 4 kV/μs B
）
When dV/dt = 8 kV/μs
Figure 2.2 Example of output waveforms of the TLP7820 with common-mode voltages
(V
CM
) applied
V
CM
(V
OUT+
) - (V
OUT-
)
V
CM
: 1 kV/div
dV/dt = 4 kV/μs
(V
OUT+
) - (V
OUT-
): 100 mV/div
t: 80 ns/div
V
CM
(V
OUT+
) - (V
OUT-
)
V
CM
: 1 kV/div
dV/dt = 8kV/μs
(V
OUT+
) - (V
OUT-
): 100 mV/div
t: 80 ns/div