Violent Smoke release took Part ID with

Posted by: Peter Bottom on 10/31/2013

Hello from Australia,
Happy to come by your company, interesting products, and active forum.
Love the prospect of designing around your products many fine features but alas todays amusement comes back to a repair job in the workshop that keeps us going while we wonder about (the next/a) hit/any product. With the MOV vapourised and taking out a 1uf polycarbonate cap, we are suspecting surge induced death.

It happens to be a CIGweld inverter 170 (Victor Technologies rebadge?) that uses one of your Tinyswitch IC's (over TopSw.. going by Pin outs) in the DIP8 7Pin arrangement. Just wondering what size/model would be suitable in any estimation better than ours.
We came by a tny264g kickin around but would hate to lose the smoke from IT TOO seeing there so useful. The circuit utility is for the Power Supply Section(board) for the Main Control Board. The circuit diagram for the 200A unit herefollowing seems roughly analogous http://victortechnologies.com/IM_Uploads/DocLib_6054_200AC-DC%20Inverter%20Arc%20Welding%20Machine%20Operating%20Manual%20%280-5207%29.pdf

It has a serious array of solder filled vias and heavy tracking for dissaption purposes presumably. The Cap that is removed (not)in the topside photo is a 22uf 400v & the still fitted one is 47uF 100v.

Having trouble attaching photos, perhaps they are too big, I'll try a reply posting for inclusion.

Very many thanks in advance for any assistance.

Regards Pete

Comments

Photos of PCB with USB plug for rough scale guide. Really quite big, wishing I could mask out zones for lower res but then again what for is run length encoding?

Hi,

Thanks for contacting PI. If I understand well, the TNY264g from us used in one of power supply board in the product, some the IC exploded together with some other components like MOV and caps.

I am sorry, but would you please repeat your question? And let us know what exactly you want us to do that could help you.

Thanks

Sorry Terry,

Only from a "T" on a remnant and it's circuit placement did we come to PI, then from the pinouts did we deduct a Tiny instead of it being a Top-switch line. The TNY264g is but merely a candidate retrieved from a codemned unit.

MOV was between the poly cap and the switcher, so perhaps took them both out.

Thanks & Regards Pete

Hi, Peter:

You want us to help you to identify the part, right?

Thanks Terry,

Yes, if at all possible and/or convenient.

Regards

Pete

Hi,

I really want to help you. Unfortunately, from the photos that you attached, it is really difficult to see the pin out. Sorry.

I would suggest you to clean the soldering (remove the tin), clean the board, and take clear photos to show. You could also draw some schematic for the external circuits connected to this part. By this way, we may figure out what exactly the device used.

Hope this is helpful/

Thanks for your response and attention Terry.

I am confident the pinout is consitent with the TinySwitch series, I hoped (and still wonder) that the wise eye might pick the likely "size" based on some surrounding circuits or that the application was so familiar. Remis of me to not provide a photo of the main control pcb circuit it seems to supply really, I apologise. The photos I did didn't really show so well what I'd hoped, fancy resolution not making up for focus!!! again, sorry. I guess I was just hoping the few discretes and spacings might suggest to the trained eye a likely sort've size switcher, I realise though my photos or descriptions might have not been clear enough.

I've got 5 TNY276 on the way so I figured such the topside was a chance worth playing if we couldn't disqualify it in the interim.

Attached is a photo of the Main control PCB just in case it is possibly relevant, also a squarer one of the Larger PCB with some markings to show the Dip7 pin locations.

Thanks and regards, Pete

Regards Pete

Hi,

I would agree with you. From the pin out point of view, it most likely a Tiny switcher.

Still it is hard to tell only from the picture, if you can draw a schematic showing the associated circuit connected to the pin, including the resistor, capacitor values, it will be very easy to tell after that.

Thanks