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MiniProg3 'repair'.
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MiniProg3 'repair'.

rolf posted on 13 Sep 2012 4:47 PM PST
Top Contributor
81 Forum Posts

 I'd like to share some info on how to 'fix' a broken MiniProg3.

 

I have several broken MiniProg3 and after a little investigation, I noticed Vtarg was short-circuiting to GND. My first thought was that the protection diode TVS3 could be the culprit, but after removing it, the short circuit was still present. Next I suspected the switched power IC TPS65053, so to determine this I removed L2. And bingo, the switched power IC is short circuiting at it's output to GND.

 

Because L2 was removed I had to power the target PSoC externally and all programming and debugging worked again.

 

The downside of this repair is that you are no longer able to use any other programming voltage setting than "external". To fully fix this problem, one needs to replace the TPS65053 which will probably cost more than a MiniProg3.

 

Regards,

Rolf

Re: MiniProg3 'repair'.

H L posted on 13 Sep 2012 05:17 PM PST
Top Contributor
679 Forum Posts

Good work.

You may be able to get samples from TI to get it repaired.

Re: MiniProg3 'repair'.

danaaknight posted on 14 Sep 2012 04:21 AM PST
Top Contributor
1773 Forum Posts

In unit volumes on Digikey is ~ $ 6 each.

 

Regards, Dana.

Re: MiniProg3 'repair'.

rolf posted on 14 Sep 2012 05:59 AM PST
Top Contributor
81 Forum Posts

Yes, the part itself would be not expensive but the time to replace it would probably be not worth it.

 

I noticed more people on internet having problems with the same TI part. It seems the negative side of the half bridge is burned, which could be due of over-/under voltage on the Vtarg or a too high current. The internal lower side FET or the protection diode may be the cause of the short circuit. The funny thing is that the protection diode TVS3 is still okay.

 

Regards,

Rolf

Re: MiniProg3 'repair'.

H L posted on 14 Sep 2012 06:38 AM PST
Top Contributor
679 Forum Posts

Yes, you are right.

But if you have the right tools and in need to have it fix. it is still possible to do.

Re: MiniProg3 'repair'.

occupy posted on 21 Sep 2012 10:14 PM PST
Top Contributor
61 Forum Posts

worth to  do！after all     the ICis $ 6 each.



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