[sdiy] DC/DC DC/AC converter IC ???

[Chris Stecker]

Hi all,

I'm trying to identify an IC in a circuit I'm modding (a headphone 
buffer/amplifier system). The case markings are pretty descriptive, but I'd 
like to know more about it's operation, maybe a data sheet...

It appears to be a set of 3 step-up DC/DC and DC/AC converters. The package is 
orange, 16-pin DIP size (but tall). It has 8 pins. In our device, only 4 are 
connected. The markings are:

NAiS 9906A
DS2E-5-DC12V

0.6A 125v AC
0.6A 110v DC
2A 30v DC

Here's a photo of the markings:
http://www.ebire.org/~cstecker/ic_marks.jpg

And a side-on view of the package:
http://www.ebire.org/~cstecker/ic_wide.jpg

The system is powered by 9v DC wallwart, and the "DS2E" provides power to  the 
differential amp IC (balanced-line input buffer) next door to it (which can 
run on anything from +/- 4v to +/- 18v). My guess is that the "DS2E" is 
converting the 9v to something like +/- 15 on it's "30v" output, but I'm 
really not sure.

We need to replace the 9v supply with a 12v DC supply (to power other circuits 
in the system) and mainly need to know whether we can get away with feeding 
this thing 12v or we need to get back to 9v first. I'd be super-happy with 
any information, but a data sheet would be tops!

Thanks,

Chris Stecker