What is the variance of the internal gate resistance (rg) in an IGBT module?

It is ±10%. However, it is not guaranteed.

What is the successor of the thermal grease G746 (by Shin-Etsu Chemical Co., Ltd) which is recommended in the IGBT Module Application Note?

Fuji recommends the paste ‘G776’. Please contact Shin-Etsu Chemical for details. However, Fuji Electric does not guarantee its characteristics when combined with IGBT module.

The alarm output terminal VFO of the small IPM goes to low level when an anomaly occurs within the IPM. What is the alarm output pulse width tFO?

The alarm output period tFO is minimum 20μs, but typical value is about 50μs. The typical value, however, is not guaranteed.

What do I have to take care of when using an IGBT module in a converter circuit?

If diode loss increases, check that the diode temperature does not exceed the absolute maximum ratings, and that ΔTvj power cycle capacity is satisfied. Also check that the system will not be broken due to inrush current at power-on or temporary interruption of power.

The recommended dead time for V-Series IPM is minmum 1μs. Does it indicate the input side (primary side) of a opto-coupler?

No. The dead time indicates the dead time on IPM input terminal Vin.

Are 2in1 modules suitable for chopper circuits?

Yes, it is possible to use a 2in1 module in a chopper circuit and use only one of the two IGBTs. To avoid misfiring, please carefully short-circuit gate and the emitter of the unused IGBT.

We would like to design a DC/DC conversion circuit. Please propose us suitable IGBT modules.

For a voltage boosting circuit, we can offer chopper modules with an IGBT in the low arm side. For step-up/down converter a 2in1 module with 2 IGBTs in series would be suitable. If only one of the two IGBTs is used, please short-circuit gate and emitter of the other one to avoid misfiring.

The IGBT module for 3-level inverter (Package No.:M403) has an extraordinary terminal. What is the C terminal in the photo used for?

Please do not connect that terminal to anything. It does not have any electrical connection to the IGBT module.

Which X Series IGBT module power cycle curves ΔTvj, Tvj min=25oC, Tvj max=150oC and Tvj max=175oC should be used for my design?

These are only exemplary temperatures. If they are not suitable for your application, use the curve that gives the shortest lifetime for your design.

What is a recommended soldering condition for the solder pin terminals of IGBT modules?

“Please solder the pins within "Soldering Heat-Resistance Test Conditions" specified in the reliability test items in the specifications. Please confirm the actual terminal temperature by using a thermocouple.”