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UCC21530-Q1: UCC21530-Q1 CTI and Channel to channel internal isolation voltage

Terry Liang
Intellectual 1910 points
Part Number: UCC21530-Q1

Hi team,

Customer have some confusions on some parameters definition of UCC21530-q1:

1. How to define the CTI(comparative tracking index)? is that tested on the IC package materials? 

2. The Channel to channel internal isolation voltage is 1850V, but the distance between these two channel is only 3.3mm. How to figure out the isolation voltage(1850V)? is it a tested value or a calculated value? whether the isolation voltage have some relationship with CTI? and what's the relationship?

Thanks!

  • 0
    TI__Guru**** 189399 points
    Hi, Terry, Please see this post: e2e.ti.com/.../965238
  • 0 in reply to Don Dapkus
    TI__Intellectual 1910 points

    Hi Don,

    It seems the post you mentioned is not related with my questions. My questions are about CTI and Channel to channel internal isolation voltage.

    Can you please feedback on it? Thanks!

  • 0 in reply to Terry Liang
    TI__Intellectual 2061 points

    Hi Terry, for CTI you understanding is in the right direction. Here are some details.

    • Material groups depend on the comparative tracking index (CTI)
    • CTI – the maximum voltage VAC (in Volts) at which an insulating material withstands 50 drops ( per 30 s) of contaminated water (0.1% ammonium chloride)
      • No tracking (<0.5 A) (formation of conductive paths)
      • This is an accelerated simulation of conditions of surface in equipment using insulating material

    • Material group is verified by evaluation of the test data according to IEC 60112

    Material groups

    CTI range

    Material group I

     CTI ≥ 600

    Material group II

    400 ≤ CTI < 600

    Material group IIIa

    175 ≤ CTI < 400

    Material group IIIb

    100 ≤ CTI < 175

    About the second question, The 1850 has nothing to do with CTI or material group. since 1850 and 3.3mm are functional operating voltage and clearance based on different pollution degrees or conformal coating which is highly dependent on the application as what Don pointed. The 1850 is the number comes from our characterization.

    Wish it help.