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questions of SM72442/72445 MPPT controller

John J Wu
Genius 3870 points
Other Parts Discussed in Thread: SM72445, SM72442

I am testing the demo board of SM72445 , and here are few questions:

 1). How to disable the PM( panel mode), or prevent it from going into PM at startup?  

 2). What is the spec of the inductor L1 (PA2965.203NL) in the demo board ?  I can't find it anywhere online.

 3). What are the differences between SM72442 and 72445 ?  Besides A/D resolution, seems there are other variations in their configuration too. Not sure if there are more. 

  • 0
    TI__Intellectual 1775 points

    Hi John,

    1)There are a few things you can do depending on what you want to achieve:

    First setting A6 to 5V (or whatever your vref+ is) should remove panel mode at startup. See table2 of the SM72445 data sheet.

    You can switch the IC to a panel mode operation where it uses the H bridge FETs instead of dedicated FET for panel mode. See table1 of the SM72445 datasheet.

    Also if enough current is detected on AIOUT at startup during the ramp-up of the output voltage (before it gets to PM) then the unit will skip panel mode and begin MPPT operation immediately.

    2) it is a 20uH. I believe it is rated around 20A but I need to find the data sheet first. It was a custom made device for the SM3320 junction box integrated MPPT.

    3) The SM72442 and SM72445 are very similar. The only difference I can think of is that the SM72445 has more options of switching frequencies and other config option such as H-bridge panel mode option. Most of the differences are on the A2 and A6 config pin descriptions.

    Florent Boico

  • 0 in reply to Florent Boico
    Genius 3870 points

    Thanks Florent!

    Other than SM72442/5, is there newer part you could recommend?

  • 0 in reply to John J Wu
    TI__Expert 4415 points

    Hi John,

    SM72445 is the latest offering from TI.

    The product by itself is relatively new and differentiated in the market place.