help in designing flyback

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alaa6

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i am trying to design a power supply with wide range input 90-270AC by using flyback topolgy with current mode controller UC3842 and the output is 19VDC

can any one provide me with helpful sources or circuits or any suggestion

bset regards
 

Hi,
These diagrams may give you a start. They are the circuits for a 500W SMPS based on flyback, although flyback shouldn't be used for such high powers.

 

thanx but this circuit will not work with me . i need the circuit without axuliary winding
 

yes you can use it with axuliary winding. the winding help the R10 resistor (100 k 1 W ) . if you want to remove the winding bettwr go for more power resister or change to ucc3805 or other which work with low current
 

For auxilary power, instead of using transformer winding, you can use a capacitor-resistor dropper followed by a zener.
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