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DRV2667: What is the difference with Flyback mode and normal mode

Cedrick
Expert 8270 points
Part Number: DRV2667
Other Parts Discussed in Thread: DRV2700

Hi,

Good day.

Our customer has this question for DRV2667. Please see below

1. We are wondering what is the difference between DRV2667 and DRV 2700? Which one is better choice for high power application?

2. What is the difference between flyback mode and normal mode? Does DRV2667 have flyback mode? How to design



3.  should pin 1,4connected with out+ and out- if we don't use flyback mode?



Thank you for your help.


Regards,

Cedrick

  • 0
    TI__Mastermind 19335 points

    Hi Cedrick,

    1)The DRV2667 is essentially a DRV2700 with the addition of a digital playback engine. the analog portion (Amp + boost) is the same, so neither is better suited than the other for high power applications.

    2)The main difference between the normal mode and the flyback mode is that in normal mode the device can drive 105Vpeak (~200 V differential) while the flyback mode allows the device to drive up to 500 V single ended. I see no reason why the DRV2667 cannot support the same flyback circuit, however since the outputs (OUT+,OUT-) are not used in this mode the extra cost of the digital playback engine is an unnecessary cost. if you wish to use the flyback mode the DRV2700 is recommended.

    3) if you use the device in normal mode. you should use a schematic similar to that on the EVM. and the piezo should be connected directly to OUT+/OUT-

    Regards,
    Arthur