ISO5852S: Can Clamp pin prevents crosstalk of SiC?

Jaehoon,

Thank you for your question.

Both (-)ve VEE and miller clamp prevent false-turn on of the mosfet. In ISO5852S, these features can be used in conjunction with one another.

Essentially, the way miller clamp functions is as follows: during turn-off, once gate voltage falls below a certain threshold, the internal miller clamp FET is switched on to provide an additional, low-impedance path to VEE on the gate.

The nature of SiC FETs experience very dv/dt, this dv/dt can feed-thru the CGD cap on FET, like shown in the below figure.

In the case of your full-bridge configuaration, when Low-side SiC is turned on, the VDS of  high-side rises with very high dv/dt and couples thru the CGD cap of SiC FET, which likely cause of the false turn-on you observe. False turn-on can also be exacerbated by parasitics of the circuit also. Sometimes, external miller clamp mosfet is even used.

jaehoon kim said:

Can the clamp pin prevent cross talk?

So Yes, it can prevent "cross talk" / false-turn on. thats exactly its purpose.

I always think of "cross talk" as between two signal lines, but this phenomenon is commonly caused by the behavior of the rest of the circuit rather than direct coupling between signal lines.

For Further information, please see a great resrouce on driving SiC:
Link to "Dv/Dt & Miller clamp" Section

next page shows more about miller clamp general function

Please let me know if I've answered your question by pressing the green button, otherwise let us know if you have any further questions.

Best,
Dimitri