TPS92641: TPS92641 Schematic review.

Hi Chun,

Calculations shows that your are trying to run the regulator at about 500Khz switching frequency.  You did not give rD (led dynamic resistance) but from your values it give rD of about 0.3 Ohm and this is reasonable.  If this is not the case then you need to follow equation 22 in the data sheet to calculate Cout.

You did not specified the input voltage tolerance but this can change some of the design parameters so you might want to re-do the calculations with you input tolerance if it varies greatly from 24V.

The other comment I want to make is that the input filter of only 2.2uF is quite low depending on your input ripple requirement.  In general, I would have at 47uF to 100uF since you are driving 9A.  Please see example in the data sheet.

Thanks Tuan

Dear Tuan,

Thank you for answer.

Can you review the design of IADJ and the resistance values ​​of VOUT, CS, and VREF?

Thanks.

Hi Chun,

Those values seem correct and you can verify all this yourself with the equations provide in the data sheet.

Thanks Tuan

Dear Tuan

It is calculated by referring to the data sheet, and I want to make sure that there is no problem.

Can you confirm?

Thanks.

Hi Chun,

I did confirm that for you.

Thanks Tuan

Hi Tuan,

Thank you.