• State Resolved
  • Locked Locked
  • Replies 7 replies
  • Subscribers 64 subscribers
  • Views 688 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Please advise ( +3.3V or +12V ) => +5V ( 0.1 A ) and -5V ( 0.1 A ).

Sergei Vereskov
Intellectual 510 points
Other Parts Discussed in Thread: TPS65135, TPS65130, TPS62170, TPS65132, TPS65133, TPS54140, TPS54040, DRV135, INA137

Hello!

Please advise an optimal, compact ( low-BOM ) and based on TI power management devices solution to make dual-power +5v and -5V out from +3.3V or +12V to power DRV135 and INA137.

P.S. Webench is not offering a single IC solution.

  • 0
    TI__Expert 5425 points

    This is a difficult requirement. I think the devices which come closest to what you need is TPS65133,TPS65132,TPS65135 or TPS65130. You may also want to look at the other AMOLED devices (TPS6513x). Unfortunately all of them do not cover the 12V input. An additional step down converter, e.g. TPS62170 might address that.

  • 0 in reply to Juergen
    TI__Guru**** 191445 points

    Does it need to operate off both 3.3 AND 12 V, or 3.3 OR 12 V?

  • 0 in reply to Juergen
    Intellectual 510 points

    I meant , that either +12V or +3.3V can be chosen as Input voltage ( that is on a PCIe card ).

    If +3.3 V is easier to handle, then lets make it as an Input voltage
    TPS65133 seems to be the best choice, but apparently it is too new and is not available anywhere ( checked www.findchips.com ) to buy 2 pcs. for testing at prototype card.
    How could I find TPS65133 at WEBENCH by myself? It cannot be found!

  • 0 in reply to Sergei Vereskov
    TI__Guru**** 191445 points

    If you want 12 V input , you could use TPS54040 and a coupled inductor to generate both +5 and -5 V.  Depending on the total switch current (that I have not calculated) you may have to move up to a higher current device, TPS54140.

    The basic approach is outlined here:

    http://www.ti.com/lit/an/slva369a/slva369a.pdf

  • 0 in reply to Sergei Vereskov
    TI__Expert 5425 points

    You should be able to order a few free samples of TPS65133 from TI. Just follow the links in the product folder.

  • 0 in reply to Juergen
    Intellectual 510 points

    TPS65133 Datasheet says, that it operates in CCM Mode for Noise Free Output Voltage and its application is Operational Amplifier Supply.
    Does that mean, that TPS65133 can be used to power Operational Amplifiers ( such as DRV135 and INA137 that I need ) without using LDOs?
    If Yes, then what passive filters would You recommend to be used with TPS65133 so, that it could power Operational Amplifiers directly ( without LDOs )?

  • 0 in reply to Sergei Vereskov
    TI__Expert 5425 points

    The device is designed to power AMOLED displays directly. Those displays are very sensitive for noise on the supply. It depends on the performance needs of your amplifier circuit, but I assume you could power the amplifiers directly.