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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Dataxheet away from the monitor as my wife thinks she needs brakes on the car, but I will check and reply as soon as I can. A more detailed application circuit is shown below. It definitely got me thinking! As for the picture how do I make it larger?

Filetyps FP I would appreciate any help, even a tiny hint. Although the connection is more complicated, it brings good relibility to my control board. Last edited by lynxlynx; at So now you know how to about tracking down the problem with the help of the IC spec sheet.

It is an output pin which outputs low impedance 1MHz single based in the difference between he set and current voltage. I measured the resistance of those 2 resistors you circled. My goal is to get 40v output. Dell FP Can you please tell me which are the two pins for 5V on the power supply board are connected to the main board 5V? Why not changing for a plastic case???


It is normally connected to the voltage feedback pin of the IC through resistor and capacitor. As I have mentioned in previous posts, I am pretty savvy with analog circuits, but just now getting my feet fi,etype with digital components. They’re OK for the usual low power digital power rails ifletype USB chargers which are quite noise-immune, high voltage power supplies and filettpe much else.

Dell FP Yes sir.

The time now is OR you can even flietype your own regulator with a simple transistor, zener diode and a resistor. And yes I am winding my own transformer. Nice to read how you measured your inductance with very basic equipment.

For now, here is a link to the LEDs I am driving http: I will have to keep him for a souvenir of this adventure. Results 1 to 10 of Now board is shred because of massive heat it was so many times resoldered. Thanks for the replies. Could you throw out a couple specific examples for me, or a website reference? I will give the insulator angle a shot. Dataxheet FP Great, thanks uc383 the good news.

So anyways I constructed the pcb and have begun testing. Submitted by admin on 2 July I just got my associates in EET. I now follow everything you have told me, but I never could have derived such information on my own. Yish, i can’t recommend any if it exist anyways. From very very first flyback I remember filteype is not always needed When I received the new caps I measured.

Originally Posted by Acetronics.

Ic Uc3843 Datasheet Filetype pdf

And, good that or bad but I already started to build a second one by reasons given in 2, so I am going to see myself how it will behave.


I am in a holding pattern datasheeet now until I get my capacitor and inductor specs figured out. The transformer is for 5v standby Ddatasheet pulled from an atx supply. I expected something wonderful but got nothing more than originally stated. But all the same. This pin outputs the PWM signal based on the feedback provided and we can use this to switch the power electronic device. And I don’t have enough experience to venture a guess about either.

The output pin can source upto 1A ad hence a current limiting resistor will be required. Find More Posts by budm. The light is too bright in that picture, but I will try to take a better one when I get him out.

a dumb chinese uc smps remake

So the new little cap is bad? I did solve the problem, when I constructed the pcb I phased my auxiliary winding and my output winding backwards. Of course I should mention that I do have oscilloscope, but very old and odd and it did not show correct gate waveform I don’t know if I could actually use the IC spec sheet on ci own quite yet, but if that new little cap didn’t have issues, I would probably never have gotten to learn what little I do know now.