• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 275 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.

TPS61022: ripple noise

Tommy Tzeng
Genius 5790 points
Part Number: TPS61022
Other Parts Discussed in Thread: TPS61033, TPS61089

Hi Sir,

Our customer has requirement, the condition as follows:

1.

VIN =2.16V

VOUT =3.3V, IOUT:2.5A

2.

VIN =3.0V

VOUT =3.3V, IOUT:2.5A

we use webench to simulate the output ripple, can not meet the condition of output ripple noise below 10mV. any other suggested solution or ways to improve? thanks for your support.

  • 0
    TI__Genius 12505 points

    Hi Tommy,

    The output voltage ripple is much related to the value of output cap and output current, so if you want smaller ripple with large load current, you need larger output cap.

    And more, for your application, we suggest to use TPS61033, because the switching frequency of TPS61033 is 2.4MHz, higher than TPS61022(~1MHz), so with same requirements of output voltage ripple, you can use smaller cap.

    Because TPS61033 is new device just RTM in last month, so we don't have Webench model by now, you can use Vp-p=Iout/Cout * (1-D) / fs to estimate the output voltage ripple roughly first and apply for a  EVM to test.

    Regards,

    Nathan

  • 0 in reply to Nathan Ding
    Genius 5790 points

    Hi Nathan,

    got it, thanks. 

    semms that TPS61089 is also a good choice, right?

  • 0 in reply to Tommy Tzeng
    TI__Genius 12505 points

    Hi Tommy,

    Yes, TPS61089 can work but needs larger output capacitors.