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TPS54240: Difference with TPS54040A

Jejomar Ildefonso
Genius 9500 points
Part Number: TPS54240
Other Parts Discussed in Thread: TPS54040A,

Hi Team,

May we know if there are any notable difference(s) between the parts TPS54240 and TPS54040A? We've looked at the datasheets and it seems that they are drop-in compatible.

The slva592 app note shows an improvement of A versions versus non-A devices but it seems that the non-A device TPS54240 also supports the tighter enable threshold and higher ESD rating improvements. Are there any other differences that we may have overlooked? Just making sure of it before we confirm to our customer.

Thanks in advance!


Kind Regards,

Jejomar

  • 0
    TI__Mastermind 31315 points

    Hi Jejomar,

    Thanks for promoting the parts. You are correct in your assessment. Please keep in mind that since the TPS54240 and TPS54040A are rated for different load currents, so there are some other differences:

    1) The current limit threshold of the TPS54040A will be smaller than that of the TPS54240 by 6 times. 

    2) The transconductance of the error amplifier is smaller on the TPS54040A than the TPS54240 by 3 times, so keep in mind this when designing the compensation network of the converter. 

    Regards,

    Richard

  • 0 in reply to Richard Fu22
    TI__Genius 9500 points

    Hi Richard,

    My apologies for the delay. Your response really helped a lot. However, our customer can't change the compensation network circuit because the production is active and the components were already bought. Could you help us analyze whether their compensation network circuit would be in the safe stability region if they simply swapped the TPS54040A IC with the TPS54240? Thanks!

    Please let me know if I should create a new thread for this follow-up question.


    Kind Regards,

    Jejomar

  • +1 in reply to Jejomar Ildefonso
    TI__Mastermind 31315 points

    Hi Jejomar,

    My comment about the compensation network is just something to keep in mind. Ideally, keeping all else the same, the crossover frequency will be increased by 3 times, which is less than a decade away from what you would have had with the TPS54040A, so I think it should be ok.   

    Regards,

    Richard