LM5145: the function of SS/TRK

zixuan zhao

Part Number: LM5145
Other Parts Discussed in Thread: TPS40170

Tool/software:

In my design, the reference voltage of FB pin should be 0.6V. If it is possible to use SS/TRK pin to clamp the Vref to 0.6V, rather than 0.8V. And other function of the LM5145 is not be influenced by the clamp ? Thanks

1 day ago

0 Timothy Hegarty 1 day ago

TI__Guru 73652 points

Yes, you can use the SS/TRK to reduce the effective reference voltage. See the LM5145 data sheet for more detial. Is this because you need an output voltage of 0.6V?

Regards,

Tim

0 zixuan zhao 11 hours ago in reply to Timothy Hegarty

Prodigy 85 points

No. This LM5145 design is plan to replace an old DC/DC. But the old one use TPS40170，the VREF of 40170 is 0.6V. I need to keep the trim of DC/DC same to the old one , so I need to change the Vref of LM5145 to 0.6V

0 Timothy Hegarty 3 hours ago in reply to zixuan zhao

TI__Guru 73652 points

Is it just a matter of adjusting hte FB divier for 0.8V?

Or maybe reuse the TPS40170.

Power management

Power management forum

LM5145: the function of SS/TRK