LM5170: Input GND and output GND are different

Francis Jiang

Part Number: LM5170
Other Parts Discussed in Thread: PMP21867,

Hi Team,

Customer want to use LM5170 to achieve -48V input & 12V output. I think LM5170 can be used without problem and have verified by PMP21867.

But in customer system, the input GND and output GND are different, which in reference design is same. So will two different GND have problem? Or must use a same GND? Thanks.

BRs,

Francis

over 1 year ago

+1 Moritz over 1 year ago

TI__Genius 12505 points

Hello Francis,

Thanks for reaching out. What is the reason for having 2 seperate grounds? Does the customer want isolation? We are looking forward for your response.

Best regards,

Moritz

0 Francis Jiang over 1 year ago in reply to Moritz

TI__Intellectual 2220 points

Hi Mueller,

Thanks for your prompt reply.

After check with customer again, there is a mistake, they use a same GND for system, and he mispassing the concepts of PGND and AGND. No problem here.

BRs,

Francis

Power management

Power management forum

LM5170: Input GND and output GND are different