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DRV591: TEC driver advantage

Luke Sun
Intellectual 1830 points

Part Number: DRV591
Other Parts Discussed in Thread: DRV593

Hi team,

My customer is always using DRV591 for TEC driver. Now they have the requirement of less BOM size. As you know, the inductor near the output of DRV591 is very big. Do we have some more advanced solution on it?

Also customer has question that what's the advantage of our PWM driver compared with DC-DC product. In his understanding, two DC-DC could do the same TEC driver as DRV591. Is he correct?

Thank you!

  • 0
    TI__Expert 6985 points
    Hello Luke! There is a lot of development at many inductor companies where new materials are being developed and in many cases leading to much smaller inductors while offering the same level of inductance. There is also a good inductor selection primer at: www.ti.com/.../sloa242.pdf and while it references automotive products, the approach is the same and these companies also offer consumer gradde deives as well. Further, there is a topical video located at: training.ti.com/inductor-selection-inductor-terminology. As far a the difference between our DRV and perhaps some other DC/DC is likely to be cost versus performance. Our DRV devices are high performance, and were designed for this type of application . For example our DRV products are very efficient and decrease power dissipation in the amplifier in general. Thanks, Jeff
  • 0 in reply to Jeff Kohnle
    TI__Intellectual 1830 points

    Jeff,

    Thanks for your feedback.

    I found DRV593/594 which only needs one LC filter rather than tw . Can they replace DRV591 as a simpler solution?

    Also you meniton DRV products are more efficient. Do we have a compare table between DRV products and DC-DC solution to show our competiveness?

  • 0 in reply to Luke Sun
    TI__Expert 6985 points
    Hello Luke! The DRV593/4 were released as newer parts to help optimize the output filter size and system cost when compared to the DRV591, otherwise parametrically the same. Also, my comment was a general one as it relates to system cost when comparing to DC/DC and I don't have any specific comparisons. Thanks, Jeff
  • 0 in reply to Jeff Kohnle
    TI__Intellectual 1830 points
    Jeff,
    Thanks for your explanation.
    Then do we have some method to calculate DRV591/593's efficiency?
  • 0 in reply to Luke Sun
    TI__Expert 6985 points
    Hello Luke! We measure efficiency here, much like we do on our class-D amps as Eff = (Pout/(Pout + Ploss). The DS efficiency plots are based on the EVM configuration with the conditions noted on Figures 2 & 3. These results can of course change depending on what load the customer is trying to drive as well as what power, freq, etc is driven through the system. There is also a good app note on power amplifier measurements in general: www.ti.com/.../sloa068.pdf Thanks, Jeff