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TPS568215: Use as an inverter

Elder Costa17
Expert 2825 points
Part Number: TPS568215

I read in one app note that nearly every buck converter may be used as an inverter. In my case I need to invert from 5-7V to -1V. As I am using TPS568215 in several other converters, I am considering it for that function as well.

Is this plan OK?

Any counter-indication for the above? Any trap I should be aware of?

Comments, critics, ideas welcome.

Thank you all.

  • 0
    TI__Mastermind 27030 points

    HI 

    it is OK using TPS568215 as inverting buck boost topology.

    you need take care below points:

    1. the DC value of inductor current will be Iin_dc+Io_dc, 

    2. the UVLO function can be just used for turn on the device, will be not accurate in turn off, because even VIn=0, there is still 1V between VIN pin and GND pin

    3. the PGOoD HIGH and LOW will be based on -1V Vo

  • 0 in reply to Daniel Li14
    Expert 2825 points
    Hi, Daniel,

    Thank you for the quick response.

    Another question: how do I design the stabilization network? I use the same network as in the normal buck configuration?

    In other words, taking my original example, do I design the network as it was 6-8V input, +1V output, same output current?

    Or there are other considerations to take into account when using it as an inverter?

    Thanks.

    Elder.
  • 0 in reply to Elder Costa17
    TI__Expert 4795 points
    Hi Elder,

    The Input voltage and output voltage is right. But for the current, you should add previous input current and output current together.

    Vincent Zhang