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Original question:

LM3409HV: Power Sequence of Power Off

LM3409HV: Vin=75V, VOUT=66V, Iout=3.5A

Julian Chen
Expert 2550 points
Part Number: LM3409HV
Other Parts Discussed in Thread: TPS92640, LM3444

Dear Team,

I check that LM3409HV can't simulate the condition  which "Vin=75V, VOUT=66V, Iout=3.5A"on WEBECH 

Does TI have any part can support this condition?

Thanks!

  • 0
    TI__Mastermind 28655 points
    Hello Julian,

    Running the LM3409HV at 75 volts input is possible but I would not recommend it. The ABS MAX on Vin is 76V, there's no margin for the design. The TPS92640/641 can run to 85V input giving some margin. You can also look at the LM3444/45 which has a low side N-FET that can be designed for 100's of volts. The LED stack will not be referenced to GND with the LM3444/45 if that is a concern.

    Best Regards,