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DRV8873-Q1: EMC

Mark Ackerson
Genius 10190 points
Part Number: DRV8873-Q1
Other Parts Discussed in Thread: DRV8873

Customer asked if "TI has a recommended output protection scheme that will ensure DRV8873 passes CE mark immunity testing (EN60730)?  Surge, ESD, EFT, etc.”

I did point out that the “DRV8873 integrates a spread spectrum clocking feature for both the internal digital oscillator and internal charge pump. This feature combined with output slew rate control minimizes the radiated emissions from the device.”

Please advise.

Thanks,
Mark

  • 0
    TI__Guru** 114905 points
    Hi Mark,

    We are currently researching your question and should have a reply tomorrow.
  • 0 in reply to Rick Duncan
    TI__Guru** 114905 points
    Hi Mark,

    The short answer is no.

    The longer answer is that our internal information has some examples at lower voltages.

    Assuming en 60730 and iec 60730 are similar, there are some lower voltage devices that can be used for concepts.
    A quick search using "site:www.ti.com system level esd protection" located several articles and devices.

    I have contacted one of the group members for comment.
  • 0 in reply to Rick Duncan
    TI__Guru 62920 points
    Hi Mark,

    I don't have expertise in DRV8873 specifically, but in general when trying to protect against ESD/EFT/surge I would first evaluate a TVS diode. That is generally the simplest and least expensive solution, but at certain levels the protection is limited (I'm unfortunately not sure what immunity levels are required per EN 60730). Here are some guidelines for understanding different TVS parameters and how to compare them against the needs of an application:

    e2e.ti.com/.../how-to-choose-a-tvs-diode-for-rs-232-rs-485-and-can-based-on-voltage-ratings

    To understand whether or not this would give the required immunity level, you could look at the peak pulse power rating of the component and compare it against the transient stress you expect. Note that as higher-voltage TVS diodes are selected (which may be needed in order to support a wider operating voltage range) it can become more difficult to find one with a given power rating.

    If a TVS is found not to be an option, then, there are several other components that can be used instead such as metal-oxide varistors (MOVs), gas discharge tubes (GDTs), etc. You can find a reference implementation using these (in order to achieve > 4 kV system-level surge) here:

    www.ti.com/.../tida-00629
    www.ti.com/.../TIDA-00731

    These references all apply specifically to interface devices, but the fundamental concepts will apply to other types of circuit as well.

    Regards,
    Max
  • 0 in reply to Miguel Robertson
    TI__Guru** 114905 points
    Hi Max,

    Thank you for your inputs.