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TPS745-Q1: How to connect FB pin?

Paul Yeh
Genius 16145 points
Part Number: TPS745-Q1

Hi team,

My customer will design fixed output voltage version-

PPS74512PQWDRBRQ1

So could you advise how to connect FB pin? is it directly connected to OUT pin?

Thanks

  • 0
    TI__Genius 14245 points

    Hi Paul,

    The PG is open-drain topology and so needs a pull up resistor between the PG pin and the voltage it is being pulled up to. Please see the applications schematics that I got from the datasheet as an example. 

    The pull-up voltage does not have to be Vout, but in general we recommend that the pull-up voltage be either Vout or Vin in order to eliminate the indeterminant PG voltage during a slow startup. The Supervisor product line has published an app note covering this in more detail if you are interested in more detail. https://www.ti.com/lit/an/snva845/snva845.pdf