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SM72445: detail for mppt way of sm72445

user6194872
Prodigy 60 points
Part Number: SM72445
Other Parts Discussed in Thread: DXP

Hello,

I bought the board which didn't mark the designator of material on the panel.

I found some datasheet about designator. However it was unclear and inconvenient grossly.

Sorry to bother you, but could you send me dxp or pcb document for comparing.

Ohhh, additionally, I sticked to test setup that load in current mode(CC) and waited for two minutes. Then, after I see a little variation, it wasn't at maximum power point yet.

What I saw is It always operates at BOOST mode, and could I change it to BUCK mode? (when it wasn't at PM mode)

I would appreciate your help.

  • 0
    TI__Guru* 78470 points

    Hi user, 

    Where do you bought the board?  I don't think Ti is producing it anymore. It was made during National Semi time (2009) and attached is a copy of the original SM3320 board assembly drawing which may not be exactly the same as yours but should be close if not.   Beta 3 Assembly Drawings.PDF

    Thanks,

    Youhao Xi, Applications Engineering

  • 0 in reply to Youhao Xi
    Prodigy 60 points

    Thanks for your reply,

    I think it is bought from "TI", though I didn't know the manufacturing date.

    So, can it running MPPT ? What's it test environment?

    or something another board or IC for MPPT?

    Thanks.

  • 0 in reply to user6194872
    TI__Guru* 78470 points

    Thanks. These are seemingly no longer available from TI.com.  

    Yes, you can run mppt with it.  You should use a PV panel simulator, and should not use a regular bench power supply.  The PV panel simulator emulates the PV I-V curve, such that the circuit can track to the maximum power point. 

    On the load side, you should use an Electronic load in CV mode for 36V or lower.  The PV simulator Voc should not be greater than 50V.  The circuit's maximum output current is limited to about 11A, if my memory is correct. 

    Thanks,

    Youhao 

  • 0 in reply to Youhao Xi
    Prodigy 60 points

    I still can't manipulate it, but doesn't matter, thank you.