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LM74701-Q1: JASO D 001 load dump requirement?

Yoshiki Ochi
Genius 9435 points
Part Number: LM74701-Q1

Hi team, 

Does this device follow "JASO D 001 type-A: A-1 load dump requirement? Or is ISO7637-2 test corresponding to that certification?

Regards,
Ochi

  • 0
    TI__Guru 57737 points

    Hi Ochi,

    LM74701-Q1 has been tested for ISO7637-2.

    If you can share details about the JASO D 001 type-A: A-1 load dump test condition, we can confirm if the device will be able to pass the test.

  • 0 in reply to Praveen GD
    TI__Genius 9435 points

    Hi Praveen, 

    I found that customer requirement and zener diode spec sheet on the web.

    https://industrial.panasonic.com/cdbs/www-data/pdf/AWA0000/AWA0000C2.pdf

    Meet for load dump surge test (JASO D 001-94) [Vp=70 V，τ=200 ms，Ri=0.8 Ω] (page1)
    The test waveform of transient voltage which specified JASO Category A A-1 70 V without breakdown (page3)

    Does LM74701-Q1 follow "JASO D 001 type-A: A-1 load dump requirement? Or is ISO7637-2 test corresponding to that certification?

    Regards,
    Ochi

  • 0 in reply to Yoshiki Ochi
    TI__Guru 57737 points

    Hi Ochi,

    Thanks for sharing the JASO D 001-94 test condition details. This test waveform is similar to ISO 16750-2 Pulse 5 Test A – without centralized load dump suppression.

    As you can see in the figure above, the peak voltage of the pulse is 70V. The LM74701-Q1 device maximum rating is only 65V and hence the device cannot withstand the ASO D 001-94 (70V) pulse alone. You will have to use an additional TVS at the input to clamp the voltage to less than 65V so that the LM74701-Q1 device does not get damaged.