• TI Thinks Resolved

ISO7842: When DC voltage applied case

Part Number: ISO7842

Hello,

There is a description as below which equivalent DC voltage when applied DC, not AC case.  There is a spec 2828VDC in DWW package case of VIOWM. Do we think ok DC spec is equal with AC peak voltage? For example VISO is 5700Vrms. In this case, 5700 x 1.414=8060VDC?

Best regards,

Toshihiro Watanabe

  • Hi Watanabe-san,

    I discussed this with our team expert on this. Here is a summary:

    -Technically , the VISO spec ( 5.7kv RMS ) and VIOTM spec (8000 V peak) are for 60 seconds duration.
    -The DC performance rated per datasheet is 2828V for the DWW package.
    - Our DC performance is quite strong. Internal data shows DC to be on par /better than AC performance, so this should be OK.

    ---
    Having said this, can you please tell us more background on this?
    Is there an application you havethat requires 8000V DC working voltage? What is the expected lifetime ?

    Regards,
    Abhi

  • In reply to Abhi Aarey:

    Hello Abhi-san,
    Thank you for your answer. specified as Vrms is only VIOWM and VISO so we can say DC is stronger than AC.
    There is a concern if DC is weaker than AC because DC voltage is always applied the same voltage, AC is cycled which there is a period lower voltage but there is a higher voltage.
    The working voltage is 1500V DC. I may ask you something later in newer post.
    Best regards,
    Toshihiro Watanabe