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Original question:

SM74611: Can I use this as a battery reverse polarity connection protection?

SM74611: Can I use Sm74611 as a series PV blocking diode?

Dave Bullock13
Prodigy 20 points
Part Number: SM74611
Other Parts Discussed in Thread: LM74610-Q1, LM74700-Q1

I have seven 12V PV panels that are to be connected in parallel to generate the current required for my application.

Each panel has it's own integral 'bypass' diode across the panel

But, to prevent illuminated panels 'driving' current into a shaded one i also need blocking diodes 'anding' the panels into a single combined 12V output.

However due to the current available from each panel, the power dissipation in conventional series diodes is too great. (even with Schottky diodes 10W for some panels)

So an 'ideal' diode is required to reduce the Vf and the SM74611 looks like a possible solution.
Looking at the datasheet I can't see any reason why the SM74611 can't be used in a 'series' application, blocking the shaded (lower voltage) PV panel from shunting the illuminated ones.

However I have not seen any applications other than the device being used as a 'Bypass' diode.

Why is this?
Am I missing something or can the device be used in a series circuit.

Please advise

Thanks

Dave

  • 0
    TI__Genius 16305 points
    Hi Dave,

    SM74611 is mainly used for bypass diode application. Its reverse blocking capability is weak, due to large reverse recovery time 260ms.
    This will be a concern in series diode application.

    If 260ms reverse recovery time is acceptable, then it can be used here.

    LM74610-Q1 or LM74700-Q1 are more suitable for using in a series blocking diode application, but these are ideal diode controllers and doesn't have MOSFET integrated. Need external MOSFET.

    Regards,
    Kari.