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Controlling Peltier element with an H-Bridge IC

Den L
Intellectual 980 points
Other Parts Discussed in Thread: DRV8412, DRV8837, DRV8834, DRV8834EVM, DRV8837EVM, DRV8832, DRV8830

Hey,

 

I am trying to find a suitable solution for heating and cooling of a special part of my circuit. For that, I have chosen a Peltier element and would like to use an H-Bridge IC with a PWM Control. Do you have a suitable IC for the regulation of the Peltier element?

 

 I’ve attached the datasheet of this Peltier element.

Additional features that the circuit should have:

-          H-Bridge: I should be able to have only 3 states: Heat-Up, Cool-Down or do nothing. I.e. the short-circuit should be disabled.

-          H-Bridge should be controlled via PWM.

Any help, like reference design, is much appreciated since I’ve never worked with Peltier elements and now we need to integrate them into more than 10 000 devices with really little time for prototyping.

 

Kind Regards,

Den

  • 0
    TI__Guru** 114905 points
    Hi Den,

    The DRV8412 and DRV8432 have been used for Peltier elements. Please refer to Figure 17 of the datasheet.
  • 0 in reply to Rick Duncan
    Intellectual 980 points

    Hi Rick, 

    thank you for your suggestions. I've also found these ICs in your product selection, but they seem a bit of overkill for me. Also my application is a wearable and I don't have much space and these ICs are quite big. Is there more ... "compact" solution from TI? 

    Kind Regards,

    Den 

  • 0 in reply to Den L
    TI__Guru** 114905 points
    Hi Den,

    The datasheet did not appear. Would you please re-send?

    What voltage and current do you need?
    What PWM frequency do you need?
  • 0 in reply to Rick Duncan
    Intellectual 980 points

    Please find the datasheet file attached. it is a PDF file. This Peltier element is not on the market yet, so I can't send you the link to the online product. If for some reason it doesn't appear on the forum could you give me your TI email, I would send it to you directly.

    - PWM: I think around 10 kHz 

    Kind Regards,

    Den.

  • 0 in reply to Den L
    TI__Guru** 114905 points
    Hi Den,

    Thank you. I received the file, but have removed it since the element is not on the market yet.
  • 0 in reply to Rick Duncan
    TI__Guru** 114905 points
    Hi Den.,

    At 10kHz PWM and <5V, there are many options available.

    One option is the DRV8837.
    If you need to automatically control the current, the DRV8834 is a possible option.
    If you need higher PWM frequency, please let us know how high. Depending on the device, >100kHz could be a challenge.

    Both the DRV8837EVM and DRV8834EVM are available for evaluation.
  • 0 in reply to Rick Duncan
    Intellectual 980 points

    Hi Rick,

    thank you for the suggestions. 10kHz is our PWM frequency so it should be enough. Is there something like a mix of these two ICs? I would like to have more control, but DRV8834 looks like overkill to me. Regarding schematics, could you provide me with some reference design for Peltier with DRV8837 or DRV8834? You can send it to me on my email at TI in case you can't post it here. 

    Kind Regards,
    Den

  • 0 in reply to Den L
    TI__Guru** 114905 points
    Hi Den,

    Unfortunately, there is no mix of these two. And there is no reference design for Peltier with the DRV8837 or DRV8834.

    There may be another option to consider. Please take a look at the DRV8830 and DRV8832. These devices adjust the duty cycle for you to achieve a set voltage across an inductive load. If you think the DRV8830 may work, please contact the peltier element vendor to ensure there is no problem.