LM5116: LM5116 double confirm schematic

Hi Lawrence,

I recommned increasing the boot cap to 100nF and using only one FET in the high-side and low-side positions (no need for 2 in parallel as the output current is only 2A). Also, it's good to install a ceramic output cap to conduct the switching frequency ripple current as the electrolyitc has quite large ESR and ESL. Note that VCCX max operating voltage is 15V (abs max 16V), so there is little margin here for output load transients.

Please also complete the LM5116 quickstart file (available by download from the product folder) and forward for review.

You may also consider the LM5146-Q1 controller for this application as it has smaller package and lower quiescent current.

Regards,
Tim

OK, Thank for your reply.

For used two FET in the high-side and low-side ,

because  Ti online WEBENCH® Designer in this case show the temperature is too high (90°C more),

so I think add MOS will improve.

Hi, Tim

OK, Thank for your reply.

For used two FET in the high-side and low-side,

because  Ti online WEBENCH® Designer in this case show the temperature is too high (90°C more),

so I think add MOS will improve.

if any, Please advise me.

Thanks,

Best regards,

Lawrence.

Lawrence,

FETs with 5 x 6mm footprint should be adequate for this application (this is better than two parallel-connected 3 x 3mm devices).

Regards,
Tim

Hi, Tim

We will change FET with 5X6mm and fill up LM5116 quickstart file as below.

LM5116_quickstart.xls

If any suggestion, Please advise me.

Thanks,

Best regards,

Lawrence.