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TPS548D22: TPS548D22 RSP,RSN,VOSNS Pins routing

IBRAHIM P
Prodigy 80 points
Part Number: TPS548D22

Hi,

In the TPS548D22RVFR buck converter, We are using the output voltage set by VSEL(pin number 33) pin of TPS548D22RVFR, As per the datasheet VOSNS, RSP connected to the output and RSN connected to Load return,

                                                                       

We have simulated the same in the webench that shows the VOSNS connected output, RSP connected to the output with 10E, and RSN connected to load return with 10E,

                                                                                  

As per this recommendation, we need clarification on the layout routing of the 3 nets VOSNS, RSP, and RSN also the placement of the two10E resistors
We have planning to place the two 10E resistors at the load side, the capacitor at the module side, and rout the 3 nets(VOSNS, RSP, RSN) from the load side. please find the image

                                                                                

Please confirm is this correct or not otherwise please suggest the best method for routing.

  • +1
    TI__Genius 15247 points

    Hi,

    Our US team will reply you after Thanksgiving holiday.

  • 0
    TI__Expert 5310 points

    Hello,

    The routing in your diagram is correct. The routing in figure 18 of the datasheet represents a simplified view application in which RSP and RSN are routed to the point of load and load return respectively with VOSNS connected to the output voltage at the load along with RSP. In the diagram you shared, the 10E resistor will simplify layout and separate the nets to allow RSP and RSN to connect to the point of load/load return easily when routing the hardware. VOSNS can then be connected directly to the output voltage net at the point of load or output bulk capacitors (in this case I recommend the point of load for the best on-time adjustment when using RSP/RSN in a remote sense fashion such as the diagram you included). 

    Please see section 10.1 of the datasheet for further layout guidance such as routing VOSNS, RSP, and RSN away from noisy traces.

    Regards,

    Alec Biesterfeld