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Boost controller shutdown

Arpan Gupta57
Prodigy 40 points

Hi TI team,

I was experimenting with few Boost controller and created a test condition where I stutdown the controller i.e the controller stopped switching. In this case, it turns off the MOSFET M. Voltage at VOUT node comes down to VIN. Hence, constant (VIN/R) DC current flows from the supply through inductor/diode. This current in turn loads the supply in shut down state as well. Is this expected that VIN will be loaded in shutdown state also? Please correct me if I am wrong.

Thanks & Regards,

Arpan Gupta

  • 0
    TI__Mastermind 31580 points
    Hi Arpan,

    Yes this a feature of the boost topology, the load is always connected to the input by a DC path through the boost inductor and diode.

    If the PWM drive to the boost FET is disable and boost mosfet is held off only the boost function is disabled.

    Regards

    Peter