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A very unfortunate TNY279PN released the magic smoke — violently

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golden_labels:
A (most likely) Power Integrations TNY279PN was very unfortunate. Found in a BQT L7-630W that experienced a failure on the primary side.

jimdeane:
You're going to need some really small bodge wires and solder tip.

tom66:
Interesting, it looks like the points of failure were the bond wires rather than the device itself.

golden_labels:
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.


--- Quote from: jimdeane on August 08, 2020, 08:47:00 pm ---You're going to need some really small bodge wires and solder tip.
--- End quote ---
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. ;)

chris_leyson:
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.

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