SiC MOSFET CAS300M12BM2 High Frequecy

NandishJasani

Hello,

I want to used CAS300M12BM2 in induction heating application. But my applications need 400KHz of switching frequency. My query is, Can CAS300M12BM2 module operate at 400KHz? I mean, is this module having internal RG. If yes then internal RG's wattage can handle this much of switching gate current?

Waiting for your reply.

Regards,

Nandish Jasani.

TBhatia

Hello, thank you for your message. A member of our technical team is looking into your questions and we will respond shortly. 

PaulKanatzar

Nandish,

In short, yes, the internal gate resistors are rated to dissipate up to 3/4 W per switch position. 400 kHz will result in about 0.62 W dissipated in the resistors. Assuming you are running a ZVS the gate charge should reduce so you may be able to push higher if needed.

As I'm sure you are aware there are many more design considerations to account for but the power rating of the resistors is in spec.

-Paul

NandishJasani

Thanks you Paul for reply.

yes we are running a ZVS and we are aware other design considerations.

Can you suggest the driver for it from Wolfspeed?

PaulKanatzar

Nandish,

I had in mind the gate loop inductance from your driver. Our reference designs are a good place to start for low inductance layouts (CGD1700HB2P-BM2).

Unfortunately, that design only has a 2 W power supply. You'll need 8-10 W to supply to support the 400 kHz switching frequency. I would recommend modifying that reference design to support a larger isolated supply. The design files are available on the link above.

Hope that helps,

-Paul

NandishJasani

Thank you so much for you suggestion. This reference design will help to design driver.