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LM63615-Q1: LM63615DQPWPRQ1 - Pulse 5b of 35V (400ms) - is sustainable? - 15 Pulse each/min.

Shubham Jagtap
Prodigy 90 points
Part Number: LM63615-Q1

We are using LM63615DQPWPRQ1 Step Down Voltage Converter in our design as we are using the TVS Diode of rated 24V and Vbr = 26.7 and clamping of 38.9V So during the Pulse 5b - TVS remain in the Breakdown region, and it gets on - large current is flowing and damaging itself. 

So we are checking our product with TVS Diode - 33V rated, Vbr=36.7 and clamping voltage of 53.3, So in this case Pulse 5b - 35V time -400ms is directly applied it to LM63615DQPWPRQ1 which is having the voltage range of 3.6V to 36V. So can this IC Sustain the Pulse 5b ?

Please check on the Priority.

Kind Regards,

Shubham 

  • 0
    TI__Mastermind 29990 points

    Hello Shubham,

    Can you share the part numbers and/or links to datasheet of the TVS being considered for this design?

    I often see customers considering 33V TVS for 12V battery designs, though, of course, extensive validation is preformed on the design to ensure robustness.

  • 0 in reply to Marshall_Beck
    Prodigy 90 points

    Hello Beck,


    Thanks for the reply. TVS part is SZ1SMB24CAT3G ; During the Pulse 5b - This TVS remain in Breakdown region and Damage due to Excessive current as our Load dump is of 35V and it is not fully clamped.

    In our design there is no any Overvoltage protection - We are using only TVS for Transient Pulses. 

    We are also considering the 33V TVS from Littlefuse but for Pulse 1b - We have raised the below Query

    As we are using the LM63615DQPWPRQ1 in our design, As we are testing it for Transient Pulse 1b as per the ISO 6737-2, so max voltage will be appeared across the device is 43.5V for 2ms - after every 5Sec for 500 Repetitive pulses.  

    As max. Absolute rating of device is 40V, so can device withstand with the Pulse 1b of 43.5V for 2ms.

    Can you please specify the behavior?

    Awaiting for your reply.

     

  • 0 in reply to Shubham Jagtap
    TI__Mastermind 29990 points

    Hello Shubham,

    The device will adjust duty cycle automatically during load dump. 

    The only criteria is the device doesn't see a voltage higher than the absmax to ensure reliability/robustness of the design.

    To me, the max breakdown voltage for this TVS appears satisfactory.

  • 0 in reply to Marshall_Beck
    Prodigy 90 points

    Hello Beck,

    i got it. Thanks for the reply.