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  • TI Thinks Resolved

TPS546D24: Check the TPS546D24 schematic

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Replies: 2

Views: 81

Part Number: TPS546D24

Hi

Could you help check the TPS546D24 schematic as below and any need to adjust?

ThanksTPS546D24.pdf

  • Hi Gareth

       TO make it easy for our customers with schematic and layout reviews, we put together this excel tool that can help. Can you please have this completed and send it to us. It has all the critical information that you should not miss when doing the schematic/layout.

    Regards,

    Gerold

    TPS546x24A_ExcelCalculator_SchematicLayoutChecklist_21Apr2020.xlsx

  •  

    This is a TPS546D24 not a TPS546D24A design.

     

    TI has put together a series of design tools and schematic review checklists to assist with detailed schematic reviews.

    The TPS546D24 is a restricted release device.  The design tools for power-stage design, compensation selection, and pin-strapping are posted to the MySecure Software folder for the TPS546D24 and can be found there.  If you have those filled out, you can attach them and we can review the results.

    Alternately, you can change the design to use the TPS546D24A, which is pin to pin compatible to the TPS546D24, offers several improvements, but uses different pin programming resistor values.

    Looking over the schematic quickly for connection issues:

    The PGND pins and the Thermal Pad (EPAD) are internally connected to the synchronous rectifier of the low-side FET and should be directly connected to the system ground planes with multiple vias within the thermal pad area for electrical and thermal stability of the device.  The existing schematic has them connected to AGND1-0.8V, and shorted to the system ground through a tie-net.  That could create significant current crowding and operational issues.

    A tie net connecting the AGND pin to the EPAD under the IC with the EPAD and PGND pins connected to the main ground would be much better.

    If being used in a single phase configuration, NC, BCX_CLK, and BCX_DAT can be connected to the EPAD with traces under the IC as well.

    Everything else appears to be connected correctly.  Once you have the design tools for compensation and pin-strapping, we can review the component selection.

    Peter James Miller

    Senior Applications Engineer

    TI Power - Buck Switching Regulators - Mid Voltage

    Senior Member Technical Staff 2020

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