• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 46 subscribers
  • Views 123 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DAC8742H: test result and/or reference design for IEC61000-4

Atsushi Hirai
Expert 3630 points
Part Number: DAC8742H
Other Parts Discussed in Thread: DAC8760, TVS3300

Hi team,

Is there any test result and/or reference design for IEC61000-4(especially for 4-4 fast transient burst and 4-5 lightning surge) EMC immunity of DAC8742H?

Thanks,

  • +1
    TI__Guru* 92715 points

    Atsushi-san,


    At this point, we do not have any tests results or reference designs for the DAC8742H regarding any IEC61000-4 tests with EMC immunity. The only reference design that incorporates any IEC61000-4 testing that we have done revolves around the DAC8760 (with https://www.ti.com/tool/TIPD153#tech-docs). I've given a link here, but this design is for an industrial voltage and current output driver.

    Because the DAC8742H is basically a modem device, I'm not sure that this will help because the operational voltages are so different. Regardless, this might help for other designs.


    Joseph Wu

  • 0 in reply to Joseph Wu
    TI__Expert 3630 points

    Joseph-san,

    My customer want us to suggest(not guarantee) a protection circuit for DAC8742H against IEC61000-4-4 and 4-5.

    Could you suggest an example circuit?

    Datasheet typical application circuit has 40V TVS, ferrite beads and 1000pF capacitor.

    What level of EMC is covered by this protection circuit?

    Best Regards,

  • 0 in reply to Atsushi Hirai
    TI__Guru* 92715 points

    Atsushi-san,


    The protection circuit shown for in the typical application has not been tested for EMC, so I cannot guess what level of EMC protection is given by that circuit.

    This circuit does use some layering of protection devices, and I don't have any other recommendations at the present time. The bi-directional TVS is the primary protection in the circuit. If the voltage level rises above the TVS voltage, the over-voltage is shunted by the diode. The ferrite beads suppresses the current rise from and EMC/ESD event, while the capacitance can act as a low impedance path to shunt the fast rise in voltage. There is a bridge, that allows for accidental mis-wiring which is also part of the protection.

    For the TVS, what voltage are they expecting to operate the loop at? TI does have some surge protection devices. One example is the TVS3300. The standoff voltage is 33V, which might be a little low for the application depending on the target operational voltage.


    Joseph Wu