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SM74611: How to turn bypass diode back off after it started conducting?

Tine Wildiers
Prodigy 10 points
Part Number: SM74611

Hi, 

I was wondering if anyone could offer me some technical help with a component: the SM74611 smart bypasss diode. 

I ordered about 300 a year ago and have been using them for a while, but i've been trying to implement something new and it's not working as expected.

I'm trying to implement a system that boosts current through cells in a solar cell string, when a certain cell is producing less energy because of shadow. This system worked fine without bypass diodes in the system, but i've added them now and it doesn't work anymore.

This raised the question: how does the diode turn back off? (after it started conducting)

  • 0
    TI__Guru 57737 points

    Hi Tine,

    SM74611 turns OFF the internal FET when the  ANODE voltage is lower than CATHODE voltage. 

    During normal operation (when ANODE> CATHODE), the internal FET is turned OFF occasionally and forces the current to flow through the body diode of the FET. This voltage drop across the diode is used to charge the charge pump capacitor. For more understanding on this operation, please refer to section '7.3 Feature Description' of the datasheet.