The LT8490 asks if you can build a high capacity MPPT charger.

The LT8490 is used to make MPPT chargers.
It was about 250W.
I must do a new design.
The new solar cell has a voltage of 75V and a current of about 30A.

Is this possible?
If possible, we would recommend selecting a MOSFET on the input and output side that we can recommend.

I can't find any data on the LT8490's GATE DRIVE, so I find it difficult to select the correct MOSFET.

And can the LT8490 run in parallel?
If possible, please give a hint.

Thank you for your technical support.

Parents
  • +1
    •  Analog Employees 
    on Sep 11, 2019 3:43 AM
    • Hi, according to the datasheet on page 1, the input voltage ranges from 6 to 80V. In the press release, it says that "The device is capable of charging currents as high as 10A depending on the choice of external FETs".
    • Kindly refer to page 9 of the datasheet for the GATE DRIVE details of LT8490. It says that "The GATEVcc pin must be connected to the INTVcc pin". This means that the power supply for gate drivers are coming from the INTVcc pin which is 6.35V. BG1 and BG2 drives the gate of the bottom N-channel MOSFETs between ground and GATEVcc. On the other hand, TG1 and TG2 drives the gate of the top N-channel MOSFETs with voltage swings equal to GATEVcc superimposed on the switch node voltages. In page 12, it says there that "LT8490 is based on LT8705 buck-boost controller, refer to its datasheet for more detailed information about the switching regulator portions of the LT8490".
    • Parallel configuration is not recommended in the applications and features of the LT8490 on page 1 of the data sheet. Other characteristic such as battery charging algorithm and MPPT may be affected if two or more LT8490 are put in parallel to charge and supply a single battery. 
Reply
  • +1
    •  Analog Employees 
    on Sep 11, 2019 3:43 AM
    • Hi, according to the datasheet on page 1, the input voltage ranges from 6 to 80V. In the press release, it says that "The device is capable of charging currents as high as 10A depending on the choice of external FETs".
    • Kindly refer to page 9 of the datasheet for the GATE DRIVE details of LT8490. It says that "The GATEVcc pin must be connected to the INTVcc pin". This means that the power supply for gate drivers are coming from the INTVcc pin which is 6.35V. BG1 and BG2 drives the gate of the bottom N-channel MOSFETs between ground and GATEVcc. On the other hand, TG1 and TG2 drives the gate of the top N-channel MOSFETs with voltage swings equal to GATEVcc superimposed on the switch node voltages. In page 12, it says there that "LT8490 is based on LT8705 buck-boost controller, refer to its datasheet for more detailed information about the switching regulator portions of the LT8490".
    • Parallel configuration is not recommended in the applications and features of the LT8490 on page 1 of the data sheet. Other characteristic such as battery charging algorithm and MPPT may be affected if two or more LT8490 are put in parallel to charge and supply a single battery. 
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