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AMC1200: ACM1200B safety standards

Lao Hu
Intellectual 790 points
Part Number: AMC1200


Hello,

A system is using the AMC1200B to measure the AC voltage between the primary and secondary of a SMPS.

In order to complies with  IEC 62368-1 safety standard, the certification laboratory is requesting IEC60747-5-5 certification.

Please, may I know is this certification is available for the P/N AMC1200BDWVR?

TI already offers the following certifications:

  • VDE Certification (Certificate: 40016131) (Rev. C)
  • UL Certification (File: E181974 Project: 478705069) (Rev. C)
  • CSA Certification (Certificate: 220991) (Rev. A)

Thanks

  • 0
    TI__Guru 55512 points

    Hi Lao,

    This certification appears to apply to opto/photocoupler devices which does not apply to the AMC1200. The AMC1200 uses a capacitive isolation barrier. 

    The certifications that you pointed to are the only certifications that we have for this device. 

    There are several sources of information regarding our capacitive isolation barrier, including the documents and video series at the bottom of this page: http://www.ti.com/product/AMC1200/support

  • 0 in reply to Alexander Smith
    Intellectual 790 points

    Hi Alex,

    Thanks for your quick reply.

    As you mentioned and confirmed, I shared same info  that standards doesn’t apply to digital isolators. In this case, the laboratory still request certification for optocouplers.

    Please, may you let me know if this part is used in this kind of applications, involving the primary and secondary in a SMPS.

    Thanks again

  • 0 in reply to Lao Hu
    TI__Guru 55512 points

    Hi Lao,

    Yes, this device is used in applications that require isolation - however optocouplers/photodiodes are not used. This device uses capacitors to transfer digital data across the barrier. 

  • 0 in reply to Alexander Smith
    Intellectual 790 points

    Hi Alex, you answered my question regarding the AMC1200.

    Still, I would need to perform some homework relating the standard IEC 62368-1, because the person in the certification company doesn't accept a device without IEC60747-5-5, which look odd for me.

    Thanks

  • 0 in reply to Lao Hu
    Intellectual 790 points

    Hi ,

    In the post https://e2e.ti.com/support/amplifiers/f/14/p/809922/2997181?tisearch=e2e-sitesearch&keymatch=62368%20digital%20isolator#2997181 you talk about the Isolated Amplifier ACM1100.

    Currently, I'm having trouble to justify that a similar device AMC1200 can be used in a SMPS between the primary and the secondary. Please, may you help to justify that the AMC1200 can be used in such application?

    Thanks

  • 0 in reply to Lao Hu
    TI__Guru**** 181781 points

    Hi Lao Hu,

    Here is a paper that describes some of the differences between optical and digital isolation devices.  I don't know of any specific requirement to use optical isolation devices in equipment that is subject to IEC 62368-1 testing.  As Alex mentioned, our AMC1200 is certified to the digital coupler standards and to the best of my knowledge should meet IEC 62368-1 requirements. 

  • 0 in reply to Tom Hendrick
    Intellectual 790 points

    Hi ,

    Thanks for your quick reply and sharing the paper, which concludes that "Product standards, such as IEC 60950-1 or similar, do not adequately address isolator component safety".

    I think this last sentence is what is happening in this project/case. The certification laboratory (perhaps) is not interpreting the standard in favor of these devices and approve only the semiconductors with IEC 60747-5-5 certification.

    In this case, this project cannot use the AMC1200 because is lacking of IEC 60747-5-5 certification, which I understand because doesn't applies.

    I was expecting, perhaps, TI (the manufacturer) could help in this regards, in order to give an interpretation on how this IC can be integrated in a system and applies for IEC 60950 or IEC 62368 using the available documentation. 

    Please, may you proposes an approach to affront this situation? 

    Thanks

  • 0 in reply to Lao Hu
    TI__Guru**** 181781 points

    Hi Lao Hu,

    I believe you are right, the equipment standards should only be looking for isolation voltage levels, minimum spacings (creepage/clearance), etc.  As I said before, I'm not aware of any that specifically say you must adhere to a particular component standard.  Sure - if you are using an OPTO, that component would ideally adhere to the IEC 60747-5-5.  If you like, I can send you a note offline and perhaps we can discuss the mater with your test house. 

  • 0 in reply to Tom Hendrick
    Intellectual 790 points

    Hi , appreciated your note offline in order to discuss further. Thanks