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:
I don't see a datasheet anywhere for this.
Thu Aug 15, 2013 5:13 am
Logo seems pretty non-descript...
Anyone recognize it?
Fri Aug 16, 2013 3:32 am
Probably a custom chip specific to that assembly (or company,
actually). The board it is on looks pretty cheap... single layer even
When they make several M number of pieces, they get to make custom
dies. Just a guess.
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.
Sat Aug 17, 2013 7:30 am
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.