5-6
Fuji Electric Co., Ltd.
MT6M12343 Rev.1.0
Dec.-2016
Chapter 5
Recommended wiring and layout
To COM terminal
of interface part
NC
P
U
V
W
N(W)
SR
C
Power
Supply
Power
GND
IPM
N(V)
N(U)
To IS terminal
Fig.5-5 Image of recommended PCB layout
(Power supply for high side drive part)
(2) Power input part
(A) Connect the snubber capacitor between P
terminal and the negative node of the shunt
resistor as close as possible.
The pattern between the snubber capacitor and
P terminal, and shunt resistor should be as
short as possible to avoid the influence of
pattern inductance.
(B) Pattern of the bulk capacitor and snubber
capacitor should be separated near the P
terminal and shunt resistor.
(C) The pattern from power GND and COM
terminal should be connected as close as
possible to the shunt resistor with single-point-
grounding.
(D) Please use low inductance shunt resistor.
(E) The pattern between N(U),N(V),N(W) terminals
and the shunt resistor should be as short as
possible.
(A)
(B)
(B)
(C)
(D)
(E)
Fig.5-4 Image of recommended PCB layout
(Power input part)
(3) Power supply for high side drive part.
(A) The pattern between VB(U), VB(V),
VB(W) and the electronic components
(ceramic capacitor, electrolytic capacitor
and Zener diode) should be as short as
possible to avoid the influence of pattern
inductance.
(B) Please use appropriate capacitor
according to applications. Especially,
please use ceramic capacitor or low-ESR
capacitor close to VB(U), VB(V), VB(W)
terminals.
(C) The pattern to Motor output and negative
pole of the capacitor connected to VB(U),
VB(V), VB(W) should be separated close
to U,V and W terminals in order to avoid
malfunction due to common impedance.
(D) If the stray capacitance between VB(U)
and power GND (or equal potential) is
large, the voltage between VB(U) and U
terminals might become overvoltage or
negative voltage when IGBT turns on and
off with high dV/dt. Therefore, connecting
a Zener diode between VB(U) and U are
recommended. It should be connected
close to VB(U) terminal.
(The same applies to VB(V) and VB(W).)
VB(U)
VB(V)
VB(W)
U
V
W
C
C
C
C
C
C
TO
Motor
ZD
ZD
ZD
IPM
(A)
(B)
(D)
(C)
bulk
capacitor
2. Recommendation and Precautions in PCB design
