smps controller IC datasheet?

oem power supply, 31.5 vdc 1.5 A.
I want to change the output to 24 v.
There is one 8-pin IC, labeled:
230D1
PUICO
I don't see a datasheet anywhere for this. 
Any ideas?
Thanks,
Dave
Reply to
DaveC
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Logo seems pretty non-descript...
Anyone recognize it?
Thanks.
Reply to
DaveC
Probably a custom chip specific to that assembly (or company, actually). The board it is on looks pretty cheap... single layer even (practically)
When they make several M number of pieces, they get to make custom dies. Just a guess.
Reply to
DecadentLinuxUserNumeroUno
It is an OnSemi PWM controller:

The board is a 5-layer. Here's the other side of the board (the LV end):

This is a ASTEC ps from a large HP inkjet printer.
Reply to
DaveC
Well, that should be easy to get a couple of.
If you had a schematic, you could likely tell what type of chip you might be able to replace it with, should you not find the exact item.
The one you pointed to is fixed freq, so there won't be a pair of pins for setting the frequency.
Reply to
DecadentLinuxUserNumeroUno
It's a simple 2-resistor voltage divider on the output which determines the output voltage. I'll replace one of these with a pot -- for trials -- then a fixed R when the value is determined.
Thanks.
Reply to
DaveC

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