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Electronics => Projects, Designs, and Technical Stuff => Topic started by: tcsaba101 on January 02, 2015, 12:38:55 pm

Title: Auxiliary supply controller
Post by: tcsaba101 on January 02, 2015, 12:38:55 pm

I have a 15V 400W chinese made power supply.

The auxiliary controller ic has been exploded, also it has blowed the coupling 0ohm resistor (picture).

The main PSU circuit works from an external supply.

I tried to identify the controller, but couldn't.

Hopefully somebody will recognize.

I have enclosed the drawing of the circuit, it is a normal very simple smps circuit.
I have another of this kind of supply, if something needs to be measured I can.

Thanks

Title: Re: Auxiliary supply controller
Post by: Seekonk on January 03, 2015, 12:27:56 am

There are a lot of them out there like the TNY26x series with slightly different pin outs.  I thought I had saved a couple to my desktop but can't find them.  Responding just so I can bookmark this post for when I do find it.

Title: Re: Auxiliary supply controller
Post by: tcsaba101 on January 03, 2015, 05:10:32 pm

Thanks!
Functionally the TNY2X series also fits to this function.

I have found two more similar parts:
On-semi NCP1027
Sanken STR-A6100

You gave me the idea to convert the original pin layout by a "pin adapter" and use NCP1027 (anyway I bought some NCP1027-s, before detailed backdrawing........).

Title: Re: Auxiliary supply controller
Post by: tcsaba101 on January 03, 2015, 08:38:32 pm

I have found an almost identical pin layout controller: STR-A6251 -A6252.  :)

The only pin what is very different is pin1.

On the A6252, this is the Source connection of the power transistor while in the SMPS unit it is probaly a brown-out protection like in NCP1207.

The other pins are looks functionally identical.