Hi,
What do you mean by "first power on"? Connecting or reconnecting the power
cable, or pressing the power button?
When the board is still hot from the previous run (e.g. you didn't connect
fan or heatsink on your prototype), and you reconnect the power cable, this
can easily happen.
Make sure your board does not get too hot during normal run.
Only reconnect the power cable after it cooled down.
For electrical/functional reasons it is also good to wait 5s...30sec before
reapplying the power, for letting registers clear and do hard reset.
Istvan Nagy
-----Original Message-----
From: Bni I
Sent: Thursday, February 04, 2016 7:50 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Tantalum explode
Hi experts
I am having issues with my 100uF 20V 1206 tantalum capacitor for 12V input.
The ripple is lower, but close to the limit (said in the DS) [~150mA]
I am facing 20% failure.Most of the time, it explodes on the first power on.
Sadly I have a lot of PCB without any hope to change the PCB.
I haven't found much on the application of the tantalum.
I found that there is some condensation/crystallization time on the first
power up.
The article suggest to use 3xVin [Ohm] serial resistor.
I am not satisfied with this solution. I think it does not help on the
problem.
It only mitigates the problem and it will blow up in my customer hands.
Any experience or artical/book are welcome.
Thanks
Steve
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