UC3843 Switching Mode Power Supply (SMPS) 0-50Volts 10Amps!

It is better to use an oxiliary winding to power the uc3843 and R1 just for start up

I will not use the uc3843 here, because the pwm is not limitet to 50 %. Uc3844 or 45 should be ok.

schematics please

The maximum power of the flyback BP is not more than 150-200 WATT. 50 * 10 = 500 watts. Overall power throttle will not allow to remove such power. What am I wrong?
Sorry for the translation.

Hope, that there is nobody following your howto. You have apparently just copy&pasted the schematic from czech engineer.
a) There is a czech description for what resistors, capacitors, graetz rectifier and MOSFET you should use.
b) The same schematic, but with removed czech texts can be easily found on few russian pages.
c) Given the parts, it is not 0 to 50V PSU, but it can be set between 11.7 and 15.7V.
d) No, it is not capable handling 10A load, at least there is a fuse at the output limiting the usable current to 6.3A.


Please, do not steal others schematics. Show your own work! Thanks

How turn for tranfomer...

Please mention transformer details.

Input voltage is 110v/230?

burlen a su maxxx el numero del diagrama es distinto al que anuncian i ademas es falsa la potencia que dicen

I like the background sound, please tell me it's title

Buenas noches,que pasarìa si invertimos la polaridad del devanado secundario del transformador??

very nice teaching but sir language no understand
please Hinde

How did you calculate the value of the choke for removing high frequency ac noise

Good day Admin...Pls kindly help me out with 12v 5A adjustable power supply based on the UC3845 PWM IC

How can I make 12V 4A smps with 24V power supply

Far East accent and fast speech makes it difficult to ascertain the windings required for the transformer more [email protected] onwards... Pz take a look.

Were i can find transformer info

This channel has something dishonest, poorly understood. People considered before believing what he said.

Good power supply it works fine but R1 produce too much heat

I wonder how power of 50X10=500 watts is available from mosfet having max power output of 150 watts(if 840).

Para fonte de 0V a 50V 10A, qual seria a especificação do transformador? Qual é a sua frequencia de trabalho?

Can i use same circuit for uc3843???

Good tiching karte hai 👌👍👌👌👌👍👌

Wrong circuit information.
Flyback cant give higher than 150W.
You say 50Vx10A=500W

Zener diode 2528 ??

Software name?

Not Working!

Always explain your work bit by bit for good knowledge transfer give details about your components value you selected

How did you calculate the value of the start up resistor

If output is 10A! Why output fuse is 6.3A?😮😮😮

Can i use the uc3843an? And what is the diference with the version bn?

Powa supry 😂😂😂😂

The information in the presentation is wrong. This topolgy, kind of flyback, is not capable of giving such powers. And in the schematic, feedback circuitry tells me that it can adjust the output voltage only in a narrow window.

6.3A output fuse on a 10A SMPS.
8W resistor to feed the IC
Sounds legit