Hi Team,
Customer currently is using our TPS548D22 to supply power to two CPU in their board. The overall architecture is shown below. Now customer wants to add two remote sense points for CPUA and CPUB simultaneously. Do we have any mature scheme for this? Many thanks.
Best,
Stanley
Hi Stanley,
In order to have a multi-point remote sense scheme, I typically recommend careful attention to detail in the layout of the output voltage trace. Specifically, this scheme would require that the series resistance of the PCB trace from the output of the inductor to CPUA and CPUB be the same (or as close as possible to the same resistance value). Then the remote sense lines of the TPS548D22 (RSP and RSN respectively) may be routed to one of the CPUs and the voltage seen by each CPU will be the same.
This diagram may hopefully clarify what I mean:
In this case R1 and R2 are the resistances of the PCB trace from the output of the inductor to the input of CPUA and CPUB respectively. If the layout can be done such that R1 = R2 and the current drawn by each CPU is nearly the same, then the sense lines may be routed to one CPU and the voltage seen by each CPU will be the same as shown above.
Regards,
Alec Biesterfeld
