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bq500212AEVM-550 fire

kyle sweet
Prodigy 105 points
Other Parts Discussed in Thread: BQ51013

My evaluation module completely stopped working.  Upon visual examination, I see U2 and U3 both have pin-head sized holes burned right through their plastic casings.  I need to figure out why or how this happened.  Is it an isolated incident or is this a known issue with the transmitter design?

I have designed a new product that uses Qi charging and my biggest concern is if my product has caused the evaluation module to fail.  I suspect that is not possible because the evaluation module ought to control itself well enough to not fry it's own ICs.  I am using a 3A power supply per specification.

Please help me diagnose the cause of failure for my TI evaluation module!

  • 0
    TI__Genius 14890 points

    Kyle,

    This is NOT a know issue.  Please send your schematic for evaluation.

    What was the input voltage to the transmitter?  How long was the system working before it failed?  What can you tell us about your product's requirements (receiver IC, power requirements)?

    Regards,

    Dick

  • 0 in reply to Dick Stacey
    Prodigy 105 points

    Thanks for the response, Dick.

    We are using a TI Tx module, TI Rx chip and TI battery charge control chip.  We did find that our product had the Rx coil tuned out-of-spec.  Usually the failure mode is that the device won't charge or begins charging for several seconds and then simply quits charging.  I'm guessing this shouldn't cause the transmitter to fail, especially with the power loss feature enabled.

    We have a small handful of chargers and mobile devices so it's hard for me to know exactly how long this particular unit worked before it failed.  It might have been very new.

    The transmitter is supplied by a 5V/3A charger (marked CE & UL).  Our product requirements are that we'd like to charge the battery (as fast as safely possible, of course).  We set the bq51013 current limit under 1A @ 5V to keep within the 5W spec of that part.