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post #21 of 31
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Damn that's confusing
 
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post #22 of 31
Quote:
Originally Posted by lzf995 View Post

Damn that's confusing

Yes, not a cakewalk. In your picture, I believe the pin on the lower left of IC401 will be connected to the mid-point of the divider network. If you power up the supply, that pin should be at 2.5V in reference to the ground on your 12V output rail. If it is, then you know you're on the right track.

Most TL431's have a 2.5V internal reference but there are exceptions. Further, there are different pinouts for TL431's where they move the pin assignements so it's easier to layout in the case you are designing.
post #23 of 31
Thread Starter 
Right I'll check that then there isn't a 2.5 on any of the bottom pins at all
Edited by lzf995 - 4/7/17 at 10:32am
 
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post #24 of 31
Wait. We need to be clear about what you're measuring.

First, do you see that line that is formed by the main transformer, the optocouplers, and that 5VSB transformer? You need to stay on the low voltage side of that line. The other side looks like it has a Power Factor Correction IC on it which means that there are potentials of 350VDC or more over there. DO NOT go over there to measure anything. You should stay well away from that side with the board powered up.

If I look at your picture in the orientation taken, the regulator IC (IC401) has one pin on the right and two pins on the left. In the orientation shown, I'm talking about that lower pin on the left. There's no need to go hunting around. Further, when I say "ground" I mean the return line on the low voltage side. You should be able to find and attach to the return on that side for the reference point. I don't mean the ground or any other signal on the other side of the line of isolation. Again, don't go over there. There are high voltages at low impedences over there that will end your existence.

I suspect that the resistor marked "332" along with the one marked "0" are the low side of the divider. The 0ohm shunt is likely just a placeholder to allow them to adjust the voltage during manufacture. If true, then that 0ohm shunt would be where you could wire in a potentiometer to adjust the output down. Those pads are so small though you'll probably need some 30 gauge Kynar wire to tap in.
post #25 of 31
Thread Starter 
I will look when I get home and just try it see what happens
 
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post #26 of 31
smile.gif Just don't wing it too much. I'm not sure if that's a 2 or 4 layer board but it shouldn't been too hard to draw those connections out on paper. There's only a handful of parts.
post #27 of 31
Thread Starter 

Well i took that resistor and put a 100k pot on it the power supply powered on and shut off now won't power up...

Never mind needed to drain caps

Right I can adjust to 13.5volt then ocp I will adjust that soon as there's a little pot with ocp on it but do you think it's safe to goto 14volt as it has like a coil whine kinda noise to it.. And I can't go below 12volt only up
Edited by lzf995 - 4/7/17 at 2:32pm
 
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post #28 of 31
The OVP (not OCP) would stop you from going higher. What kind of resistance are you applying where that shunt was located? A 100K pot may be way out of range. That shunt may have been just connecting the upper resistor to the 12V output.

The whine may be from the supply losing stability in it's feedback loop. You're obviously trying to do something outside of the design window.
Edited by Master Chicken - 4/7/17 at 3:39pm
post #29 of 31
Thread Starter 
Quote:
Originally Posted by Master Chicken View Post

The OVP (not OCP) would stop you from going higher. What kind of resistance are you applying where that shunt was located? A 100K pot may be way out of range. That shunt may have been just connecting the upper resistor to the 12V output.

The whine may be from the supply losing stability in it's feedback loop. You're obviously trying to do something outside of the design window.

Yeah I though I meant ovp not ocp I reloaded after about an hour and Im don't know the exact resistance but I started off with 50k then slowly went down and the voltage started to pick up slowly so I have to fine adjust to around 13.45volt, and I've tried messing with the other basic pots on the PSU and calmed down the buzzing a little bit it's just a little bit louder than normal now.. So do you think it's going to last and not kill 6 underpowered Peltiers at 6.75v each almost the 7 I wanted
 
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post #30 of 31
Well, are you still at 13.45V and not the 6.75V you're trying to target? I think the OCP is going to trip you up at some point. The transformer and inductor are designed to target a certain range and 6.75V is pretty far below the 12V of the original design.

I'm working on a variable supply for TECs but I've not sent the boards off to be cut yet.
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