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Original question:

PMP11371: Reference design PMP11371 - PCB and schematic

PMP11371: Layout UCC28740 - CS pin layout

LS
Prodigy 140 points
Part Number: PMP11371
Other Parts Discussed in Thread: UCC28740

Dear TI,

may anyone look at below layout,cricital area are marked with correspondding text, the area shown is around 65mm vertical x 60mm ,

my concern is CS pin routing and placement, 

i tried to route UCC28740 GND and CS PIN return path through separate traces, the trace between  CS resistor and Bulk cap is  around 10mm long, 

pls give your comments , below is snapshot of placement, routing , 

let know if i am clear, if more information is needed 

Post

Regards

ls

  • 0
    TI__Intellectual 1410 points

    Hi ls,

    This configuration will add parasitic inductance to both the CS path and DRV path. I would add a GND connection by where R22 and R19 are to reduce the inductance for those connections. For the connection you can use a thinner trace to separate the power and signal loops, the higher current from the primary loop would follow the wider trace you have now and the signal lops will flow through the other connection that has less inductance.

    Let me know if you have any questions on this.

    Thanks,

    John

  • 0 in reply to John Dorosa
    Prodigy 140 points

    Hi John,

    thank you for looking and providing suggestion ,

    now keeping a thinner trace for CS and DRV loop on pcb, and power path remains as it is through a wider trace 

    Regards

    Ls