
Fuji Electric Co., Ltd.
2-4
MT6M12343 Rev.1.0
Dec.-2016
Chapter 2
Description of Terminal Symbols and Terminology
Item Symbol Description
Input current IIN Current flowing between signal input IN(HU,HV,HW,LU,LV,LW) and COM.
Input pull-down resistance RIN
Input resistance of resistor in input terminals IN(HU,HV,HW,LU,LV,LW).
They are inserted between each input terminal and COM.
Fault output voltage
VFO(H)
Output voltage level of VFO terminal under the normal operation (The lower side arm
protection function is not actuated.) with pull-up resistor 10kW.
VFO(L)
Output voltage level of VFO terminal after the lower side arm protection function is
actuated.
Fault output pulse width tFO
Period in which an fault status continues to be output (VFO) from the VFO terminal
after the lower side arm protection function is actuated. Refer chapter 3 section 6.
Over current protection
voltage level VIS(ref)
Threshold voltage of IS terminal at the over current protection.
Refer chapter 3 section 5.
Over Current Protection
Trip delay time td(IS)
The time from the Over current protection triggered until the collector current
becomes 50% of the rating. Refer chapter 3 section 5.
Output Voltage of
temperature sensor V(temp)
The output voltage of temp. It is applied to the temperature sensor output model.
Refer chapter 3 section 7.
Overheating protection
temperature TOH
Tripping temperature of over heating. The temperature is observed by LVIC.
All low side IGBTs are shut down when the LVIC temperature exceeds overheating
threshold. See Fig.2-2 and refer chapter 3 section 8.
Overheating protection
hysteresis TOH(hys)
Hysteresis temperature required for output stop resetting after protection operation.
See Fig.2-2 and refer chapter 3 section 8.
TOH and TOH(hys)are applied to the overheating protection model.
Vcc Under voltage trip level of
Low-side VCCL(OFF)
Tripping voltage of the Low-side control IC power supply.
All low side IGBTs are shut down when the voltage of VCCL drops below this threshold.
Refer chapter 3 section 1.
Vcc Under voltage reset level
of Low-side VCCL(ON)
Resetting threshold voltage from under voltage trip status of VCCL.
Refer chapter 3 section 1.
Vcc Under voltage hysteresis
of Low-side VCCL(hys) Hysteresis voltage between VCCL(OFF) and VCCL(ON).
Vcc Under voltage trip level of
High-side VCCH(OFF)
Tripping voltage of High-side control IC power supply.
The IGBTs of high-side are shut down when the voltage of VCCH drops below this
threshold. Refer chapter 3 section 1.
Vcc Under voltage reset level
of High-side VCCH(ON)
Resetting threshold voltage from under voltage trip status of VCCH.See Fig.3-3
Resetting voltage at which the IGBT performs shut down when the High-side control
power supply voltage VCCH drops. Refer chapter 3 section 1.
Vcc Under voltage hysteresis
of High-side VCCH(hys) Hysteresis voltage between VCCH(OFF) and VCCH(ON).
VB Under voltage trip level VB(OFF)
Tripping voltage in under voltage of VB(*). The IGBTs of high-side are shut down
when the voltage of VB(*) drops below this threshold. Refer chapter 3 section 2.
VB Under voltage reset level VB(ON)
Resetting voltage at which the IGBT performs shut down when the upper side arm
IGBT bias voltage VB(*) drops. Refer chapter 3 section 2.
VB Under voltage hysteresis VB(hys) Hysteresis voltage between VB(OFF) and VB(ON).
(2) Control circuit block (Continued)
Table 2-2 Description of Terminology