Ic uc datasheet filetype pdf. Danita Manual datasheets. I did have read datasheet and I do not see any flaws at least now. File Type: gif . I built one successfully but it was a low voltage one and also it was inefficient ( using IC) and just demonstrated to me how they work. U1 is a uc U3 is a Tl File Type: jpg . I’m sure you’ve already read these, but for reference, the PWM IC’s datasheet is here.

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Ic Uc3843 Datasheet Filetype pdf

I think I have a pretty good start, but my knowledge is lacking enough to continue. I measured the resistance of those 2 resistors you circled.

As you want to make it ‘water-proof’ Less holes, and screw have to be consider This is mostly because any resistance of the datadheet in series with R12 will change the AC characteristics, but changes in the resistance between id node and ground aren’t really important for AC if the resistance is too low, the GBWP pole of the TL will shift down and that could still cause problems.

Also, I had nothing connected to the power board except AC when I took the IC measurements, so if that is not good, I can uuc3843 everything back up and repeat. Have a Dell FP monitor with no signs of life.

a dumb chinese uc smps remake

Last edited by Rthompson; at There’s still some insulator kit for most package to avoid that in case you really want to screw the regulator on the metal casing. So to repeat, now with all connected, cycling power button does absolutely nothing.


So tell me what you guys think. Thanks for all your help so far and I hope to hear back from you.

Just pull the Vfb pin low with a resistor and the output transistor will be in cutoff and this takes the onboard error amp is out of the equation. A swithcing regualtor is better for large current I also had the heat problem with such linear regualtor. You’ll be surprised what increase or decrease in efficiency you get by simply changing a capacitor or inductor. As Leds are to be driven at constant current your Leds are supposed to need a lot This is for loop response testing and could be replaced with a a zero ohm link or jumper when not testing the loop, but it doesn’t really affect anything by being there as its much smaller than R11 and R The yellow trace is my gate signal and the blue trace is taken directly of the output filter cap.

Thanks KX36 for your descriptive reply! I am aware of danger of any user interfaces on primary, but it’s not a pot but a trimmer. Last edited by KX36; at As I can understand, it does not start. They are available in variable output versions as well.

After three measures with adjusting air gap with layers of thin ticket paper I got a resonance at 13,7kHz, so found inductance is ,2uH. I am posting the schematic here hoping to get some criticism before I construct the PCB.

This might seem a bit of a rude question, but I think datashete has to be established first in any troubleshooting Submitted by admin on 2 July No more improvement over the previous Remember also that the output voltage has a significant influence on the AC characteristics of the loop.


Saw no evidence of bulging CapXon capacitors on power supply board or anything anywhere else which looked out of the ordinary. The output pin of the IC is connected to the gate driver circuit of the Power switch which is to be switched. A shunt resistor is used to monitor the change in current in the circuit and then this difference voltage across the shunt is provided to riletype feedback pin.

There’s no problem, ux3843 learning opportunities.

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When PCB was ready later I realized it was erroneus and fixed itand when everything was soldered, including new inductor, it did not work. I am not sure what a real air gap is in my transformers all they are gapless soldered from dead ATX PSUs and I really need to measure inductance. Each controlled via hpwm from the pic. I couldnt find a LM version specifically. I wish to rebuild it with same parts except: Results 1 to 8 of 8. You want to burn away a lot of the electric power in your regulators in order to give a little piece of power to your LEDs.

Thanks budm, this is very exciting. In many case, you can place a heatsink on your Regulator and secure it on your PCB.

The difference in voltage level is supplied to this pin.