Author Topic: A very unfortunate TNY279PN released the magic smoke — violently  (Read 1392 times)

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Online golden_labelsTopic starter

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A (most likely) Power Integrations TNY279PN was very unfortunate. Found in a BQT L7-630W that experienced a failure on the primary side.
People imagine AI as T1000. What we got so far is glorified T9.
 

Offline jimdeane

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Re: A very unfortunate TNY279PN released the magic smoke — violently
« Reply #1 on: August 08, 2020, 08:47:00 pm »
You're going to need some really small bodge wires and solder tip.
 
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Online tom66

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Re: A very unfortunate TNY279PN released the magic smoke — violently
« Reply #2 on: August 08, 2020, 09:21:45 pm »
Interesting, it looks like the points of failure were the bond wires rather than the device itself.
 

Online golden_labelsTopic starter

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Re: A very unfortunate TNY279PN released the magic smoke — violently
« Reply #3 on: August 09, 2020, 10:08:41 am »
Unfortunately I do not know, what has happened. I received the PSU in a non-working condition with information that it blows fuses in the apartment. The context and the wording suggests that the power supply experienced a few shorts in the two-digit amps range. Besides this poor chip, primary side had rectifier with shorts and epoxy on one leg broken out, at least one MOSFET killed and a 10A fuse blown. But only this one got hit so hard that it literally exploded.

Coincidentally Zeptobars’ last post is about Power Integrations INN2605K. A far cousin that shares many features of this one. They also have TNY264, a specimen from the earlier iteration of this family.

You're going to need some really small bodge wires and solder tip.
I should also buy one of those fancy focused ion beam deposition devices to fix the transistor, which seems to be shattered into pieces. I have seen some used power supplies for those on eBay for a bargain price of $40k. ;)
People imagine AI as T1000. What we got so far is glorified T9.
 

Offline chris_leyson

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Re: A very unfortunate TNY279PN released the magic smoke — violently
« Reply #4 on: August 09, 2020, 10:35:19 am »
I've seen Power Integrations LinkSwitch-3 parts leave a small crater where there used to be silicon. After two supplies blew up violently at a mere 2kV EFT test we don't use P.I. parts and probably never will.
 

Offline newbrain

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Re: A very unfortunate TNY279PN released the magic smoke — violently
« Reply #5 on: August 09, 2020, 09:09:11 pm »
You're going to need some really small bodge wires and solder tip.
You are joking, but I once did something similar to a TO3 2N3055.
Hacksawed away the top, resoldered the Emitter, and used solder to put back together the sliced case.

I then used it in the 5V linear supply in my home-made-all-TTL-mains-frequency-synchronized 4 digits frequency meter (yes, max 1 MHz with a 7490 prescaler)
It is still there, and after about 40 years it's still going! (not that I use it any longer...)
Nandemo wa shiranai wa yo, shitteru koto dake.
 

Online golden_labelsTopic starter

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Re: A very unfortunate TNY279PN released the magic smoke — violently
« Reply #6 on: August 14, 2020, 06:56:04 am »
I don’t have tools to properly take photos of the die, but this is what I managed to squeeze from a cheap webcam “microscope”.
People imagine AI as T1000. What we got so far is glorified T9.
 


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