CRD-30DD12N-K reference design : DC primary power supply for the gate driver

gkim

Hello,

With respect to the reference design of CRD-30DD12N-K, I have a question on the MAIN board.

The DC/DC converter R15P21503D is used as the DC primary power supply for the gate driver.

The negative output of R15P21503D is -3V nominally.

Meanwhile I have two replacements for R15P21503D: QA15115R2 and QA151C3.

The negative output of QA15115R2 is -2.5V nominally whereas the negative output of QA151C3 is -4V nominally.

I am planning to use one of two replacements for R15P21503D as the DC primary power supply for the gate driver.

I wonder which one is better as the DC primary power supply for the gate driver.

QA15115R2 or QA151C3?

Thank you for your consideration.

With regards,

GKIM