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LM74610-DQEVM: OR'ing FET check function

Timothy Tran2
Intellectual 410 points
Part Number: LM74610-DQEVM

LM74610 controller has a FET check function that periodically turn off/on OR'ing FETs for brief moment as indicated in the attached user guide - does it turn off/on both FETs (FET1_A, FET2_A) at the same time or alternating between the 2 ORing FET1, FET2?

Thanks,

Tim

  • 0
    TI__Guru 57737 points

    Hi Tim,

    LM74610 controller turns OFF the FET occasionally (~2% Duty cycle) so that the body diode drop of the FET can be used by the controller to charge the charge pump capacitor. The FETs are not turned OFF and ON for FET check functionality.

    There is no synchronization between the two controllers to turn OFF and ON the FETs. So, the behavior will be random.