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TPS543620: Design Review

nikhil sankar
Prodigy 70 points
Part Number: TPS543620
Other Parts Discussed in Thread: TPS543320

Tool/software:

Vin=12V and Vout=1.2V @2.5A . please give feedback on the above design

  • 0
    TI__Mastermind 23695 points

    Recommend R126 (MODE), R125 (FSEL), R129,R128 (ls fb) and C230 (BP5) connect to AGND, instead of GND.   

    Connect AGND to PGND at one point.  See figure 8-32 in TPS543620 datasheet page 31 link for example schematic. a zero resistor can be substituted for the net tie. 

    See figure 10-1 in datasheet  for example pcb layout showing the agnd island and connection to pgnd and placement of vin to pgnd capacitors. 

    Consider adding a 0 zero ohm resistor in series with C232 (boot). Depending on PCB layout a 2.2Ohm resistor may be required to reduce SW node voltage overshoot.

    Recommend adding a 0-Ohm placeholder for an Rff in series with C232 . This can help improve load regulation in case of non-ideal AGND to PGND connection in the PCB layout. 

    With TPS543620 Rmode can be 26.7kohm for the lower current limit setting.   Make use the inductor saturation current is greater than current limit. 

    The TPS543320 is the 3A version of TPS543620, if  TPS543320 used, use Rmode of 2.21kohm