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TL1451 & LM6144 Analog MPPT Failure Question (X-post)

Other Parts Discussed in Thread: TL1451A, LM6144, LM6142, TL1451

I was advised that this is the correct forum to post this question to about my MPPT project.

I'll link to it instead of reposting. Basically I have a stateless analog MPPT designed from the TL1451A due to concerns over long term radiation susceptibility (use in a cubesat). I've identified several possible failure mechanisms causing me to have low yield rates on my MPPT's following professional pick and place assembly.

Any help is highly appreciated! I will mark this answered with the other post simultaneously when appropriate.

  • Hello Bryce,

    We did TID testing on the LM6142, which is the dual version of the quad LM6144.   It started failing at 10 krad.

    The testing we did was a long time ago.   The products have since been moved to a new wafer fab.   It is possible that the radiation response will be different for the current material.

    If you would like to see a list of products that are radiation qualifed go to:

    ti.com/space

    ti.com/radiation for radiation reports

     

  • Thanks Kirby, The group I'm helping performed their own radiation testing in 2012 to show it was suitable for our uses. Maybe the fab change helped that.

    FYI I posted a final response to this TL1451 and LM6144 project on the original forum post. Might not be a root cause but it's a fault space reduction and so far overall better design and testing.

    e2e.ti.com/.../1695129

    Thanks!
  • Thanks Kirby for offering this help to Bryce.