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LM5072: DC current limit setting

Polly Chung1
Intellectual 2110 points
Part Number: LM5072
Other Parts Discussed in Thread: TPS23754, TPS23751

Dear team,

According to LM5072 datasheet, maximum current limit is 800mA. If my customer Rdccl = 15kohms which means the current limit is 850mA. Do that have any risk? And can the current limit setting value be really up to 850mA or LM5072 will auto-set the current limit to 800mA? Thank you.

Regards,

Polly

  • 0
    TI__Expert 5615 points
    Polly, I have assigned this thread to our PD Application Engineer and he will reply within 48 hours to your technical question. Our apologies for the brief delay as he is presenting at a conference today.

    In addition, I wanted to write and reinforce what is on www.ti.com/product/lm5072 - which is that our team recommends the TPS23751 (or TPS23754) over the LM5072 from a general guidance perspective. This part was inherited from the National portfolio and does not have the same level of collateral, or support (in TI Designs, etc.), that these other suggestions have in place today.

    If the project which the LM5072 is being considered for still has a window to discuss part selection, please do check with the customer if these other suggestions will work. If not, don't worry, there are no plans to obsolete it...I only mention it in order to provide the best system support possible.

    Regards,
  • 0 in reply to Thomas Lewis
    TI__Mastermind 40120 points
    Hi Polly,

    As this is an older part, the datasheet is the most information we have regarding the performance. Unfortunately, looking at the datasheet, the part was characterized only as far as 800mA. The block diagram does not suggest that you can't go higher to 850mA. However, if it can, there's no guarantee that the current limit accuracy will hold true.

    The LM5072 is a non-standard to power levels greater than 13W (which is the case here). The PD must to hardware classification which this PD cannot do (older device). TPS23751 and TPS23754 is recommended and has a min limit of 850mA (~1A nom).
  • 0 in reply to Darwin Fernandez
    TI__Intellectual 2110 points

    Dear Thomas and Fernandez,

    Thanks for your reply. Customer already finish the design. I will try to promote new parts if there is new project. Thanks again.

    Regards,

    Polly Chung