Fuji Electric Co., Ltd.
3-15
MT6M12343 Rev.1.0
Dec.-2016
Chapter 3
Detail of Signal Input/Output Terminals
The input logic of this IPM is active high. This logic has removed the sequence restriction between the
control supply and the input signal during startup or shut down operation. Therefore it makes the
system failsafe. In addition, the pull down resistors are built in to each input terminals in Fig.3-16. Thus,
external pull-down resistors are not needed reducing the required external component. Furthermore, a
3.3V-class MPU can be connected directly since the low input signal threshold voltage.
As shown in Fig.3-16, the input circuit integrates a pull-down resistor. Therefore, when using an
external filtering resistor between the MPU output and input of the IPM, please consider the signal
voltage drop at the input terminals to satisfy the turn-on threshold voltage requirement. For instance,
R=100Ω and C=1000pF for the parts shown dotted in Fig.3-15.
Fig.3-16 shows that the internal diodes are electrically connected to the V
CCL
, IN(HU, HV, HW, LU, LV,
LW) and COM terminals.
Please don’t use the diode for a voltage clamp intentionally. When the diode
is used as a voltage clamp, it may damage the IPM.
Fig.3-16 Input terminals IN(HU,HV,HW), IN(LU,LV,LW) Circuit
2. Input terminal circuit
Vcc
<HVIC>
Vs
OUT
VB
IGBT ( H )
IGBT ( L )
D
R
< BSD >
COM
N ( U , V , W )
U , V , W
P
V
CCH
Vcc
GND
U
,
V
,
W
OUT
R
Driver
R
Driver
R
V
CCL
IN ( LU )
IN ( LV )
IN ( LW )
U
IN
V
IN
W
IN
internal supply
+
-
Delay
Input
Noise
Filter
+
-
IN ( HU )
IN ( HV )
IN ( HW )
IN
HV
level
shift
GND
VB(U,V,W)
<LVIC>
Input
Noise
Filter
