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That's right, It's important not to give up when we hit one of the obstacle :)
Now, when power supply is over, i will upgrade it, there is always room for improvement, next stop feedback using optocoupler and TL431
I spent 2 hours reading various books trying to find solution, and it paid off...
Problem solved, i added 1N4007 and 47ohm 2W resistor between VCC of the power supply and VCC of the PWM controller. Power supply is now fully functional. R12 is increased to 3.9k, short circuit current is about 4.6amps, before it was 0.28 amps. Max power i manage to get out is 87 watts, for this...
Tried to connect emitter to output voltage, but nothing... I think this is too much. I should choose voltage mode controler, they are easier for first project.
Power supply is already on PCB, but i think i could operate in flyback mode, there is small gap vhere i glued core and i have spare UC3842 so i could built simple flyback circuit and tested it.
Diodes are orientated propertly, i don't have any bridge rectifier that fast.
I guess i have...
my power supply is capable of 12V and 50A, also, as i said, with grouded pin 3, i draw 5A from power supply without any problems and i didn't noticed any noise from SMPS. Voltage was 23.9V at 0A and at 5A load.
Hi, 2 months ago I started designing my own SMPS based on Texas Instruments UCC3808 Current-mode PWM controller. It's one of the rare PWM controllers (current-mode ones) that have overcurrent protection.
Schematics is in attachment.
My problem is, everything is working, i have 23.9V @ 0A, and...
Hi, 2 months ago I started designing my own SMPS based on Texas Instruments UCC3808 Current-mode PWM controller. It's one of the rare PWM controllers (current-mode ones) that have overcurrent protection.
Schematics is in attachment.
My problem is, everything is working, i have 23.9V @ 0A, and...
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