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TPS546B24A: TPS546x and TPS65400 schematics review

SW zhao
Prodigy 10 points
Part Number: TPS546B24A
Other Parts Discussed in Thread: TPS65400,

Hello

Can you review the schematics of TPS546x and TPS65400 for me?

P03_POWER_SUPPLY.pdf

  • 0
    TI__Genius 14827 points

    Hi Zhao,

    Our US team will review it then reply you soon.

  • 0
    TI__Mastermind 48200 points

       

    What design tool was used to develop the 4 TPS546B24A designs?

    Have you filled out a the schematic review check-list?  https://www.ti.com/lit/zip/slurb01 

    All of the designs are listing compensation coming from default NVM.  Are you planning to program this prior to first power-up, or are you expecting the default NVM value to be stable?  If you are programming it, please enter the desired programming values into the design check list.

    Why does the design use the same 6-pin header with 3 enable options?  Is this an evaluation board that needs different enable options?

    I will ask someone from the TPS65400 team to review those 8 outputs.

  • 0 in reply to Peter James Miller
    Prodigy 10 points

    What design tool was used to develop the 4 TPS546B24A designs?

    Reply:TPS546x24A Compensation and Pin-Strap Resistor Calculator , www.ti.com/.../SLUC686 

    Have you filled out a the schematic review check-list?  https://www.ti.com/lit/zip/slurb01 

    Reply:NO,I don't have this, thanks for sharing

    All of the designs are listing compensation coming from default NVM.  Are you planning to program this prior to first power-up, or are you expecting the default NVM value to be stable?  If you are programming it, please enter the desired programming values into the design check list.

    Reply:Plan to program this prior to first power-up.

    Why does the design use the same 6-pin header with 3 enable options?  Is this an evaluation board that needs different enable options?

    Reply:Yes,need different enabling options

    At the same time, please help to check whether the output inductance and capacitance are correct,Tks

  • 0
    TI__Genius 15135 points

    Hi, SW

    I have reviewed the schematic. 

    The Vin for TPS65400 is 12V, right? 

    If yes, suggest lower down the frequency to 500kHz which is benefit for efficiency. 

    So suggest changing R142=R70=374kohm. 

    Others looks good. 

  • 0 in reply to Zhao Ma
    Prodigy 10 points

    Hi Zhao Ma,

    Our PCBA has come out and found that it is unstable for no load and max loads. Is this related to the switching frequency?Or do you have debug suggestions?

  • 0 in reply to SW zhao
    TI__Genius 15135 points

    Hi, SW

    Could you send me some waveforms? 

    I think it is related with Fsw. 

    Yes, suggest reduce the Fsw, then test again.