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LM51571-Q1: LM51571-Q1:

PRINCE ALEXIS
Prodigy 90 points
Part Number: LM51571-Q1

Hello Team, 

i have a query related to LM51571Q1 . Question is we would like to confirm our understanding. The query is suppose if we are applying a voltage >0.7v the device will go into standby mode. if the voltage at UVLO pin is greater than 1.575 then device goes into run mode. So if i want to stop the SEPIC from operating i should pull down the voltage at UVLO less than 0.3 V right ?

Also whether we can use the VCC voltage from the SEPIC as a pull up for the PGOOD pin ?

  • 0
    TI__Mastermind 19595 points

    Hello Prince,

    Thanks for reaching out to us via e2e.

    So if i want to stop the SEPIC from operating i should pull down the voltage at UVLO less than 0.3 V right ?

    To really turn off the controller, we would usually recommend pulling down the UVLO pin to a voltage below 0.33V.

    For short gaps which also require a quick re-start, it is also possible to pull the UVLO pin to a voltage between 1.37 and 0.7V
    This will keep the internal regulators alive and the part will NOT go through the initialization process when it starts up again.

    Compare Figure 9-2 and figure 9-3 in the datasheet.

    The VCC voltage can be used to drive a pull-up for the PGOOD pin. but it must not be used to supply or drive any loads.

    Best regards,
    Harry