• State TI Thinks Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 205 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

DRV2700: DRV2700 frequency response on 10nF load.

Peter Wei
Expert 3030 points
Part Number: DRV2700

Hi Team,

Could you provide the frequency response of DRV2700 on 10nF load?

The other conditions are: 3.6V supply voltage, Gain=28.8.

If we don't have the full curve, could we tell the Vpp on 20kHz only? We have 21Vpp on 33nF on the plots as figure 9, Could it be 27~28Vpp on 10nF?

Best Regards,

Peter Wei

  • 0
    TI__Guru* 84915 points

    Hi, Peter,

    We don't have the full curve for the 10nF load yet. However, the 20KHz Vpp value cannot reach the 27-28Vpp for a 10nF load. This range is barely reached when no load is attached.

    I think the maximum Vpp level you could reach under these conditions is 25Vpp.

    You would need to increase the gain to 38.4dB or 40.7dB and the boost current to 1.25A - 1.5A in order to reach the 27-28Vpp level.

    Please let me know if you have additional questions or comments.

    Best regards,
    Luis Fernando Rodríguez S.

  • 0 in reply to Luis Fernando Rodriguez S.
    TI__Expert 3030 points

    TKS, Fenando,

    Do we have the efficiency data of 3.7V battery voltage, Vout 13Vrms, 70mA output current on the load? Or similar data. Not sure if you can measure it?

    Best Regards,

    Peter Wei

  • 0 in reply to Peter Wei
    TI__Genius 13610 points

    Hey Peter,

    Sorry for the delay in this response, I am going to inquire if we have this data for you now.

    Best,

    Carson Allen

    LPAA Applications Team

  • 0 in reply to Peter Wei
    TI__Genius 13610 points

    Hey Peter,

    If we take a look at figure 1 on page 6 we can see the efficiency graph for the parameters that match closest to the ones you listed above. The voltage you are using is lower than the 30V listed on the graph, which would mean the efficiency would be higher around the 70 - 75 % range. But you can see the line ends at 60mA and it goes out of regulation long before that at 20mA. So it may not be possible to even supply that 70mA.

    Also referring to your initial question it also may not be possible to reach 27 - 28 Vpp for 20kHz at any gain level because of bandwidth issues, it would be more realistic to try to achieve that voltage closer to 15kHz..

    Best,

    Carson