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UCC2897A: How to understand SS and FB?

Dylan Zheng
Intellectual 1815 points
Part Number: UCC2897A

Hi team,

As the datasheet shown, the amplifier output will be the lower voltage of VFB and Vss. How to understand the this amplifier configuration work principle?

Thanks

  • 0
    TI__Mastermind 34465 points

    Hi Dylan,

    The simplified block schematic is intended to show that the output of the opamps  is which ever is the lower value of FB or SS/SD pins.

    I added the resistors (marked in blue) to the block schematic and this is intended to show that the negative input of the top opamp and
    the positive input of the lower opamp will force the corresponding input to equal the output.

    Hopefully this gives helps. Remember this is only a visual block schematic of the actual ic design

    Regards

    John