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 29, 2020 4:14 PM over 1 year ago

    I apologize but I am the product applications engineer for the LT3083 but I don't recommend using the LT3083 or any other non-switching device to drop the 6V between your solar panel and the LTC4015 because the non-switching device used that way will dissipate (waste) too much power.  Contact Technical Support from the Analog Devices web site and see if they can recommend a part that is a better fit than the LTC4015.

  • 0
    •  Analog Employees 
    on Jan 29, 2020 4:31 PM over 1 year ago in reply to ARad

    It should be noted that the customer is not looking for high efficiency while the LT3083 is active. My understanding is that this is mostly meant for OV protection and to get a little power through (unlike OV protection alone). The solar panel will have low current capability in the voltages where the LT3083 is active (operating near the solar panel's open-circuit voltage), so the actual power dissipated may be acceptible.

    We do have some other solar chargers with higher voltages. You might consider LTC4013. However, we do not have any higher-voltage charger with the digital telemetry that the LTC4015 has.

    Regards,

    Zack

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  • 0
    •  Analog Employees 
    on Jan 29, 2020 4:31 PM over 1 year ago in reply to ARad

    It should be noted that the customer is not looking for high efficiency while the LT3083 is active. My understanding is that this is mostly meant for OV protection and to get a little power through (unlike OV protection alone). The solar panel will have low current capability in the voltages where the LT3083 is active (operating near the solar panel's open-circuit voltage), so the actual power dissipated may be acceptible.

    We do have some other solar chargers with higher voltages. You might consider LTC4013. However, we do not have any higher-voltage charger with the digital telemetry that the LTC4015 has.

    Regards,

    Zack

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