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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Yes, the new datawheet cap is bad. Keep high current loops small and use thick traces. Again, these are all the electrolytic on the power supply board. Remember also that the output voltage has a significant influence on the AC characteristics of the loop.

voltage regulator help – ot

A good craftsman builds his own tools! That’s what i did on some occasion.

Steve It’s not a bug, it’s a random feature. I see no reason not to put the thing back together, but will await your instructions in case I should check something else while it is disassembled. The top of the cap isn’t bulged or anything but looks a little odd for a brand new panasonic. They should be included in the tight gate drive high current loop.

But all the same. It is an output pin which outputs low impedance 1MHz single based in the difference between he set and current voltage.

TL — Programmable Reference Voltage. I will have to keep him for a dataheet of this adventure. I was not able to find a good heat sink to remove uf3843 heat. Glad to hear of your success! Other parts may need to change as well. And I am only advanced user of that supply Sorry for bad english. Traditionally you’d need to rent some seriously expensive equipment to test the loop, but I’ve been working on ways to avoid the use of this.


Now you have some high frequency oscillation in bursts every 20us as well as more in between. Good practice to put it in even if you’re not going to test the loop any time soon. So the problem is solved, I got my flyback PSU which works and gives the right voltage, I only need to insert a trimmer on secondary so it is isolated from mains.

I was working on a bigger design, but then I thought about how I was going to power the IC’s. 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. Why not changing for a plastic case??? Please read first Advanced Search.

a dumb chinese uc smps remake

Yish, i can’t recommend any if it exist anyways. Used ESR meter and found 2 caps suspect. I am new to flybacks but previously 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.

All times are GMT. Yes, C is a little 22uF, 50V. Since you told me about that cap, I went and found him and the top where a cap usually has those uc38843 marks looked a little funny, so I got a little magnifying glass fuletype the top has a whitish substance leaking out from under the heatshrink a little and the heatshrink has a very slight raised edge.

Steve, thanks for the info on the fullpack. Refer the datasheet at the end of the page to know more about this IC. Results 1 to 30 of As for voltage, I always see 8V despite even if voltage appears on secondary during attempts to start. Dell FP Yes sir. You don’t strictly need this capacitor as the parasitic capacitor is the more important one, but it’s good to put it there to give some form of control over this pole.


Ic Uc3843 Datasheet Filetype pdf

I have used up to uf and no smoothing occurs. It is normally connected to the voltage feedback pin of the IC through resistor and capacitor.

From your explanation, it needed to be 11V to start charging the cap C which evidently it was, but I was unable to see it because I’m not that fast and the 9. I measured the resistance of those 2 resistors you circled.

This is for loop response testing and could be replaced with datasjeet 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 Daasheet and R I am going to try out this circuit which floats on net, with few adjustments for V. Each controlled via hpwm from the pic. I going to go the LM route.

As I can understand, it does not start. So now filetye know how to about tracking down the problem with the help of the IC spec sheet.

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 checked Pin 2 Vcc to Pin 3 Gnd and measured 9.

Filrtype again and look forward to more instructions. Well after a big research, I finally made everything right and got my working powerful flyback!