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SM74611: Two SM74611KTTR smart diodes be operated in parallel

Josel Go
Expert 6465 points
Part Number: SM74611
Other Parts Discussed in Thread: LM74610-Q1, LM74670-Q1

Hi Experts,

Good day.

Can two SM74611KTTR smart diodes be oriented in parallel for increased capacity?
Any application notes on that?

Please advise.

Regards,

Josel

  • 0
    TI__Guru** 107121 points

    Hi Josel,

    Thanks for reaching out!

    Can you share the use case and max path current details ? Is it different than solar panel bypass diode replacement 

    We will check the impact on the device regulation loop while running units in parallel and confirm on the feasibility

    Best Regards,

    Rakesh

  • 0 in reply to Rakesh
    TI__Expert 6465 points

    Hi Rakesh,

    Good day.

    The customer responded.

    I will use the SM74611KTTR as a 3-brush generator cutout (reverse battery protection) substitution on my 1925 Studebaker bus and 1939 Chris-Craft boat. The 1925 Studebaker has a 6-volt positive ground electrical system. Normal charging rate is 10 AMPS. The maximum charging rate is up to 15 AMPS. The 1939 Chris-Craft has an 8-volt negative ground electrical system. Normal charging rate is 12 AMPS. The maximum charging rate can go over 15 AMPS for a short interval. In both applications, I plan on including heat sinking for the SM74611KTTR. I have PCB-mounted SM74611KTTR in hand from Europe however since possible replacements now appear difficult to obtain, I am hesitant to do extensive testing on them for fear of damaging one of them. I am interested in knowing if two SM74611KTTR can be paralleled to give me a factor of safety over an individual piece rating.

    Please advise.

    Regards,

    Josel

  • 0 in reply to Josel Go
    TI__Guru 57737 points

    Hi Josel,

    2x SM74611 devices cannot be connected in parallel as the charge pumps of these devices would be asynchronous. When one SM74611 turns OFF its FET so as to allow its charge pump to charge the internal charge pump capacitor, the parallel SM74611 FET could be ON and allow more current to flow through it. having a lower voltage drop across the parallel SM74611 FET (when ON) will also not allow the charge pump to charge its capacitor.

    I would recommend you to have a look at LM74610-Q1 or LM74670-Q1  which drive and external FET and allows for selecting the FET as per load current requirement.