LT3083 as a Voc Clamp to power LTC4015

Hello,

I am using the LTC4015 with Solar Panels that have Open Circuit Voltage (Voc) as high as 42V, but the maximum voltage that can go into the LTC4015 is about 36V. So I am looking for a Voltage clamp / Regulator that can output 36V/3A from a 42V/3A power input. 

 For this requirement my search lead me to LT3083, and specifically to the high voltage regulator mentioned on the datasheet (Page20).  

Following are my questions

1. Is this a good solution for the requirement I have? or are there better alternatives?

2. For the above schematic to output 36V/3A apart from Rset, any other parts on the schematic will need changing?

3. I dont completely understand the input section FET circuitry, can someone explain this part?

Thanks.

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  • 0
    •  Analog Employees 
    on Jan 28, 2020 9:00 PM over 1 year ago

    Hi Deepak,

    I am not familiar with LT3083, but I can give some LTC4015 perspective. It may work. Your idea is basically to protect the circuit when above 36V, knowing you will not get much power in that case, but then operate the regulator in dropout the entire time. This will essentially cause the regulator to be a pass-through for the solar panel (minus the dropout voltage). It just might work with the LTC4015's MPPT scheme, but it is not something we have tested.

    Regards,

    Zack

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  • 0
    •  Analog Employees 
    on Jan 28, 2020 9:00 PM over 1 year ago

    Hi Deepak,

    I am not familiar with LT3083, but I can give some LTC4015 perspective. It may work. Your idea is basically to protect the circuit when above 36V, knowing you will not get much power in that case, but then operate the regulator in dropout the entire time. This will essentially cause the regulator to be a pass-through for the solar panel (minus the dropout voltage). It just might work with the LTC4015's MPPT scheme, but it is not something we have tested.

    Regards,

    Zack

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