Electronics > Projects, Designs, and Technical Stuff

A problem about my switch mode Power supply

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China NewBoy:
 i made a 24V switch mode power and it is suppoed to output the current of 2A ,but ,after i did some experiments,i found the Volt drop down to 22V when the LOAD is 12ohm. (there is weird sound -ZiZi)  (pdf 's  left upon part is the power supply unit) ,i think the circuit around OPA or tl431 is the key ,however, i just cant adjust it properly.

my SchDoc Pdf
my PCB Doc

 hope the problem solved :-+

Simon:
If you start another topic twice you will be banned! i hope that is clear enough for you.

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