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smps controller IC datasheet?

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DaveC
Guest

Wed Aug 14, 2013 2:05 pm   



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

DaveC
Guest

Thu Aug 15, 2013 5:13 am   



Quote:
230D1
PUICO


http://oi44.tinypic.com/33a6o89.jpg

Logo seems pretty non-descript...

Anyone recognize it?

Thanks.

DaveC
Guest

Fri Aug 16, 2013 3:32 am   



Quote:
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.


It is an OnSemi PWM controller:

<http://www.onsemi.com/PowerSolutions/product.do?id=NCP1230>

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

<http://oi42.tinypic.com/102w1go.jpg>

This is a ASTEC ps from a large HP inkjet printer.

DaveC
Guest

Sat Aug 17, 2013 7:30 am   



Quote:
The one you pointed to is fixed freq, so there won't be a pair of pins
for setting the frequency.


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.

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