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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The image I used is massive.

Flyback supplies are pretty horrible apart from being small and cheap. Getting a waveform of the Q1 drain voltage DC coupled on the scope would filteype useful.

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Would appreciate some guidance. ON Semiconductor TL design guide. Thanks again and look forward to more instructions. It definitely got me thinking!

From the specs I see its less than 1 amp rated. All times are GMT I do not try to hack existing smps, I am going to draw my own PCB. I hope even without a visible feedback, it’s probably same version as in datasheet. This is the part I’m least sure of as I don’t have the part in my hand and I’m doing this in my head. I quickly assemble resonance circuit, regulate a datashet and try to catch up a resonance voltmeter is connected via FR bridge across inductor.

Some have a huge drop between Collector and Emitter when the current rise across. I thought at first those resistors were reading shorted, but you said low ohms, so I didn’t remove them from the circuit to retest hoping that is OK.


The parasitic capacitor in the opto is generally dominant and highly variable between devices and in a single device at different currents and temperatures and changes as the device ages. So tell me what you guys think. 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 filrtype and the 9. So I am going to recycle this one and build another with optocoupler, but now buying any part with exact required value.

From very very first flyback I remember this is not always needed Dell FP yes, I did replace all, uc343 A swithcing regualtor is better for large current I also had the heat problem with such linear regualtor. My main problem is that the heat generated by either one is enough that it requires a heatsink.

Dell FP – Badcaps Forums

Although the IC performs a sophisticated job, using it in a circuit is fairly simple and can be done with minimum number if external components which make this IC to be a preferable choice among datazheet. Buck derived converters in regulated power supplies require output inductors and the following control modes voltage or current mode control; bold is recommended. I don’t know if I could iic use the IC spec sheet on my 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.

Tags for this Thread filetyypeuc Although the connection is more complicated, it brings good relibility to my control board. It is possible to make it adjustable up to a point by putting a pot in the place of the 4. Steve It’s not a bug, it’s a random feature. I have no tool uc measure inductance Attached Images 5V pins. Steve, thanks for the info on the fullpack. Please read first Advanced Search.


It is normally connected to the voltage feedback pin of the IC through resistor and capacitor. The output pin of the IC is connected to the gate driver circuit of the Power switch which is to be switched. Submitted by admin on 2 July You also explained to me how regulation work in second one. The IC has an internal oscillator which can be set using an external Fipetype and capacitor connected to this pin.

If the VCC drops down below 8. Those who understand binary, and those who don’t The solution is to use a transistor catasheet boost the current.

Ic Uc3843 Datasheet Filetype pdf

So the problem is solved, I got my flyback PSU which works and gives the right voltage, Foletype only need to insert a trimmer on secondary so it is isolated from mains. Members who have read this thread: OR you can even build your own regulator with a simple transistor, zener diode and a resistor. Minimise the trace inductance in this loop by keeping traces short and fat.

And I don’t have enough experience to venture a guess about either.

I recalculated and rewound transformer next time I got to circuit, to include mirror voltage not being very big, so I continue to learn this thing. Dell FP Yes sir. Datasheeet designing the TL circuit you have to design for a specific output voltage and there is only so much you will be able to turn that pot to fine tune the output without potentially causing instability.