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TPS54335 problem, replace by TPS54335A?

Intellectual 450 points

Replies: 7

Views: 1108

Dear all,


I designed a 24V to 15V / 2.5A power supply beginning of the year with WEBENCH. Due to some delays my prototypes are now finally ready.

Unfortunately the designed circuit only delivers up to 1A. If higher output currents are drawn then  the 15V break down.


I saw now that the TPS54335 has been taken from the market and was replaced by TPS54335A. The new WEBENCH design suggests now different resistor, capacitor and inductor values. May there a chance that only replacing the TPS54435 with the A version will make the circuit work again?

Best regards,

Karlheinz

  • Karlheinz,

    TPS54335A has replaced the TPS54335. Please design with the new version.

    I will loop in application engineers who can assist more with the problem.
  • In reply to Surinder Singh:

    TPS54335A address some reliability problems. I doubt it is what is affecting your design. If your input supply is falling, you may be current limiting the input supply.

    Best  Regards,

    John Tucker

    BSR-MV DC/DC Applications

     

    “Working on an automotive power design? Read the E2E technical article Meet European Commission ADAS requirements with TI DC/DC for device recommendations and other helpful resources.”

     

  • In reply to JohnTucker:

    John,

    thank you very much for your answer.

    Just to be sure: my input supply is not falling, my design with the TPS54435 fails, here the output voltage is falling. It should deliver 2.5 amps but fails even with 0.5 amps.

    I designed the whole circuit with WEBENCH and considered the layout recommendation. I will know exchange the TPS54435 by the A version in the next days and see what happens. Until now all my designs of WEBENCH worked, this is the first one which fails.

    Best regards,

    Karlheinz

  • In reply to KarlheinzRieber:

    Can you post your schematic?

    Best  Regards,

    John Tucker

    BSR-MV DC/DC Applications

     

    “Working on an automotive power design? Read the E2E technical article Meet European Commission ADAS requirements with TI DC/DC for device recommendations and other helpful resources.”

     

  • In reply to JohnTucker:

    Contact me directly at j(dash)tucker(at)ti(dot)com. I can provide some material for your review.

    Best  Regards,

    John Tucker

    BSR-MV DC/DC Applications

     

    “Working on an automotive power design? Read the E2E technical article Meet European Commission ADAS requirements with TI DC/DC for device recommendations and other helpful resources.”

     

  • In reply to JohnTucker:

    Thanks John,

    I will prepare the schematic for you on Monday.

    Best regards,

    Karlheinz

  • In reply to KarlheinzRieber:

    John,


    for your information I solved the problem. It was mainly because of the too small input capacitor in front of the TPS54435A circuit (15V output). Therefore the 24V input voltage dropped and this led to the 15V failure.


    Thank you very much for your help.

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