General > General Technical Chat
A very unfortunate TNY279PN released the magic smoke — violently
(1/2) > >>
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.
Navigation
Message Index
Next page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod