Hi everyone, i designed a forward converter with this spec
Vinput= 50V-150V DC
V output = 12V, 5A
i used for control and feedback circuit uc3843 ic. when i make work convertor exactly, supplying uc3843 with external 15V dc source, converter and uc3843 works how my except. but i need a internal supply for uc3843. i read about that it possible with a bootstrap circuit and i tried it. i can make work it for 50V,which is my minimum input. but @150 input my convertor output is failing although i keept uc3843's supply 16 to 22V.( it's data sheet say it can work 10V to 30 V supply).
@150V input("150V.png" file)
Yelllow one is convertor output voltage,(about 1V)
blue is convertor output current
red is uc3843's supply
@50V input ("50v.png" file)
blue and yellow wave form is similar you can copmpare it y axis for voltage and y axis for amper)
red is uc 3843 supply voltage.
and u can see the all circuit in "circuit.png" file, if anyone want to check over, i can add ltspice simulate file.
Vinput= 50V-150V DC
V output = 12V, 5A
i used for control and feedback circuit uc3843 ic. when i make work convertor exactly, supplying uc3843 with external 15V dc source, converter and uc3843 works how my except. but i need a internal supply for uc3843. i read about that it possible with a bootstrap circuit and i tried it. i can make work it for 50V,which is my minimum input. but @150 input my convertor output is failing although i keept uc3843's supply 16 to 22V.( it's data sheet say it can work 10V to 30 V supply).
@150V input("150V.png" file)
Yelllow one is convertor output voltage,(about 1V)
blue is convertor output current
red is uc3843's supply
@50V input ("50v.png" file)
blue and yellow wave form is similar you can copmpare it y axis for voltage and y axis for amper)
red is uc 3843 supply voltage.
and u can see the all circuit in "circuit.png" file, if anyone want to check over, i can add ltspice simulate file.
