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TIDA-01333: why is TPS55010 needed?

Viktorija Cecil
Genius 17961 points
Part Number: TIDA-01333
Other Parts Discussed in Thread: ISOW7841, TPS55010, , INA149

Team,

If ISOW7841 provides isolated power, why does this reference design use TPS55010?

Thanks

Viktorija

  • 0
    TI__Intellectual 880 points
    Hi Viktorija,
    Here is an extract from the user's guide p2, for more details on this topic i would refer you to the rest of the UG
    "The TIDA-01333 design has two isolated power supplies to power the isolated side of the board. A FlyBuck™
    converter topology, built up with a TPS55010 Fly-Buck regulator and a transformer, is used to
    create the ±15-V rails required for the MUX and the INA149 device. The board offers two options for
    creating the +5-V supply rail. In the first option, the same transformer used for the ±15-V rails has another
    separate winding to generate a +5-V rail. This rail can be disabled or enabled with a jumper that turns on
    or turns off a low-dropout regulator (LDO), which is connected subsequently to the separate the 5-V
    winding of the transformer. In the second option, the +5-V rail created by the ISOW7841 device can be
    used. The two options are implemented so that the user can evaluate the two options against each other"
    MCV