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LM74610-Q1: solar panels in parallel

D3jun58
Intellectual 370 points
Part Number: LM74610-Q1

Hello,

I'm planning to connect three solar panels to the one MPPT. Each solar panel will use a some type of reverse current protector connected in a series. The easiest way would be to use a schottky diode, but at higher currents this could lead to relatively high power dissipation. The better variant is to use P-MOS transistor or N-MOS. N-MOS has lower Rds_on in the same case (in compare to P-MOS), but it needs a driver. LM74610-Q1 looks good for this application. But, I'm not sure - if any of solar panel is completly shaded at one moment, and other two panels are normaly illuminated at the same time, could this lead that the reverse current from other two panels will flow in to the shaded panel?- in this example the panel will get negative voltage, but LM74610-Q1 will turn-off N-MOS relatively immediately, am I right?
On the other side...maybe N-MOS with driver is "too complicated", P-MOS could perform task in a simmilar way but with small number of components...

Many thanks for suggestions,
Kind regards.

  • 0
    TI__Genius 16305 points

    Hi 

    LM74610 or LM74670 can be used for reverse current blocking 

    Let me sugggest which better suited among them as soon as posible today.

    Regards,
    Kari.

  • 0 in reply to Karikalan Selvaraj
    TI__Genius 16305 points

    Hi

    Yes, LM74610 or LM74670 will block reverse current when one module is shaded and sees reverse current flow from other modules.

    LM74670 is same as LM74610, but LM74670 has higher gate drive (67uA) compared to 10uA gate drive current of LM74610, this allows LM74670 to drive bigger MOSFETs for higher power requirements.

    Maximum reverse voltage is -42V and in this application we don't see that violating.

    For same RdsON, NMOS is smaller and cheaper compared to the PMOS.

    Another benefit of LM74610 (LM74670) is that the GND current is 0A. No power wasted, which is crucial in solar panel application which can improve the efficiency.

    Regards,

    Kari.