Internal SMD Gate Resistance of CAB400M12XM3 and CAB320M17XM3

Nico

Hello,

I have a question regarding the Wolfspeed Modules CAB400M12XM3 and CAB320M17XM3: We are about to order these modules and wanted to ask for information regarding the built-in SMD gate resistors. At this year's PCIM, I saw that there is the possibility of integrating an SMD resistor into the power modules. For example, for the power module CAB320M17XM3, the datasheet provides information of an internal gate resistance of 1.5 Ohm. I'm wondering if only the internal (on chip) gate resistor of the MOSFETs itself is used or if an additional SMD resistor is also included. If the additional SMD resistor is used, would you be able to share this information?

It is planned to use a high switching frequency, and we are wondering if we need to consider the power loss at the SMD resistors. As far as I saw in the opened power module at PCIM, the SMD resistors are not connected to any cooling.

Thank you very much for your help!

Best regards,

Nico

Forum_Moderator

Thank you for your post, it has been approved and we will respond as soon as possible.

AustinC

Hi Nico,

The various XM3 module variants feature different resistor values in the gate network. Some have SMD chip resistors on the PCB and some have no additional resistance. The CAB400M12XM3 (4-die per switch position) has a 2 Ω SMD chip resistor at the Gate of each MOSFET on the PCB with a power rating 0.4 W; it also has a 1 Ω chip resistor of similar power rating on each Kelvin-Source. The CAB320M17XM3 does not have any SMD chip resistors on the PCB.

Best Regards,

Austin C.

Nico

Hello,

thank you very much for the information! That helps a lot. One additional question to that: In the module CAB320M17XM3  is then a 0 Ohm jumper resistor for both, gate and kelvin, assembled, right?

Best regards,

Nico

AustinC

Hi Nico,

The CAB320M17XM3 does not have any SMD chip resistors; the PCB was updated to remove the resistors.

Austin C.