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Original question:

DRV8873H-Q1EVM: LC filter for driving Peltier element

DRV8145-Q1: Possibility to use as a Peltier Driver

Takuchi
Prodigy 175 points
Part Number: DRV8145-Q1
Other Parts Discussed in Thread: DRV8706-Q1

Hello,

I am looking into options to fully drive this Peltier element rated at 128.7W, 13.1A, 15.7V (link: https://de.rs-online.com/web/p/peltiermodule/4901402).

Is is possible to use this DRV8145? I want to fully drive the Peltier at 100kHz (or even lower if not possible).

According to the Datasheet, the device is rated at IoutMax = 46A. Does this mean that if I connect two Peltier in series, I can drive both the Peltiers with this driver?

Thank you very much in advance.

Best Regards,

  • 0
    TI__Mastermind 24555 points

    Hi,

    Thank you for your question.

    TI has FET integrated drivers then it could be used for Peltier driving, although it is designed for motor driver originally.

    - 100KHz is tough condition especially with high current (13.1A). DRV8145-Q1 can support 100KHz, however switching loss could be huge. Do you have load current waveform for PWM driving? Any possibility customer can reduce PWM frequency like 10 or 20KHz?

    We can try helping Ploss rough estimation if load current waveform(on DRV) is available. 

    - I know Peltier driving current on motor driver will be different from motor load. So it is difficult to estimate power loss in DRV. Evaluation module is available to try- FYI. 

    -Gate driver (DRV8706-Q1) could be option.

    regards

    Shinya Morita

  • 0 in reply to Shinya Morita
    Prodigy 175 points

    Hello Shinya,

    Thank you a lot for your reply.

    We don't have a load current waveform right now. I think for now we can estimate the Peltier as a linear load.

    I got back from the customer, we only have +12V input so maybe we only need to drive the Peltier at about 10A (80% capacity)

    What is the maximum frequency vs load current that you recommend?

    We can try to lower the PWM to about 50kHz or 20kHz.

  • 0 in reply to Takuchi
    TI__Mastermind 24555 points

    Hi,

    Thank you for your feedback. I will reply to you within 24hours.

    regards

    Shinya Morita

  • 0 in reply to Shinya Morita
    TI__Mastermind 24555 points

    Hi,

    We can use thermal estimator for motor/inductive load.

    We can check with your customized condition. Thermal estimator is available on TI.com. 

    www.ti.com/.../DRV8145-Q1

    Assuming load looks same with Peltier, here is result with 20KHz PWM and 50KHz PWM. 20KHz looks OK to drive longer time. 50KHz might be up to ~5sec.

    regards

    Shinya Morita