LM3429: have built 4K circuits, and a small percent can not misteriously be repaired. Please Help! Need to improve reliability.

Hello,

We apologize for the delay in response. Someone will get back to you. However, we will need more details of your schematic, the nature of the issue, waveforms etc to be able to help out.

Thanks

Hi Lupillo,

We did not hear back from you with the requests above so we believe that you may have solved the issue.  The thread will close now but will re-open if you reply.

Thanks Tuan

Hi Tuan,

I was waiting for you guys to contact me, but did not hear back from you.

Please advice how to proceed from here. Thanks.

Hi Lupillo,

Sumeet first responded to you asking for schematic, nature of the issue and waveforms showing the issue.  We will need that as a first step to help here.

Thanks Tuan

I was about to send the pdf schematic, but there is no attachment button.How do I send you my schematic in this venue?

Hi Lupillo,

Please see the following link to help you with this.

https://e2e.ti.com/support/site-support/f/1024/t/761619

Thanks Tuan

Here is my schematic:

SM-222 LT Dim Ballast 24V to 48V_rev3.pdf

Hi Lupillo,

You mention above' the board cannot be repaired no matter what you do'...Does this mean that you have tried replacing all the components on the board and it still does not work?  When things failed how does it failed?  I there any switching coming out of the GATE of the LM3429 at all?  Did you try trouble shooting to see if any trace has opened up? 

Thanks Tuan