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LM62460-Q1: Load dump protection

Amine LTAIEF
Intellectual 545 points
Part Number: LM62460-Q1
Other Parts Discussed in Thread: TIDA-020047, AM2732, LM62460, LM706A0

Tool/software:

Hello

I am redesigning my board based on the TIDA-020047 reference design. However, my circuit needs to be powered by a 24V nominal input instead of the 12V recommended for TIDA-020047. I need to customize the components to support 24V input and include load dump protection.

Could you recommend any reference designs for this purpose? My goal is to retain the core design of TIDA-020047 while adapting it for the 24V input. The board will be powered by an electric vehicle (EV), so protection against high voltage surges is critical. The vehicle's fuse box delivers 24V, but I damaged my TIDA-020047 board (specifically, the AM2732) due to high voltage exposure.

Regards

  

  • 0
    TI__Mastermind 35210 points

    Hello, sorry for the issue. The device can support 24V, but it is my understanding that for a 24V battery load dump profile, the voltage may exceed the absmax of hte device.

    In that case, you may want to consider a higher intput voltage device to support the load dump profiles such as: https://www.ti.com/product/LM706A0-Q1

  • 0 in reply to Marshall_Beck
    Intellectual 545 points

    Hi thank you for your answer so if I understand well I have to replace my Lm62460 by lm706A ?

    What is the function of the TVS diode in this case ?

    Regards 

  • 0 in reply to Amine LTAIEF
    Intellectual 545 points

    HI,

    I hope you can assist me with an issue I've encountered. Under the same test conditions, using an EV as the voltage source, the TIDA020047 board was damaged (specifically the AM2732 component). However, when using the AM2732EVM kit, the board was not damaged, although it did not start.

    Based on this, I suspect the AM2732EVM may have better protection mechanisms compared to the TIDA020047. Could you provide any insights or suggestions regarding this observation?

    Should I replace  my Lm62460 by lm706A0 to garant the protection/functionalities of my AM2732.

    Thank you in advance for your help.

    Amine

  • 0 in reply to Amine LTAIEF
    TI__Mastermind 23695 points

    Hi,

    Marshall is out of office and will return to provide a response to this tomorrow.

    Thanks,
    Andrew

  • 0 in reply to Andrew Kutzler
    Intellectual 545 points

    Hi

    Ok thank you 

    Amine 

  • 0 in reply to Amine LTAIEF
    TI__Mastermind 35210 points

    Hi Amine,

    Load dump protection is a system level requirement.

    It is my understanding that no device self-protects its input voltage from exceeding its absmax.

    Most customers I see protecting from load dump by implementation of a TVS diode in their system.

    This diode breakdwon voltage is below the ABSMAX of the converter.

    Given typical operating voltage and TVS clamp voltage for 24V battery systems, I see most systems selecting 60V+, max operating devices for a 24V battery system.

    LM706A0 seems like a good fit for this application.

    In regards to your evaluation, it is inclusive to me if one design is more robust that the other. It is certain though, the ABSMAX of a any device must not be violated to ensure it is not damaged. Without input protection, you may have damaged components on the board.