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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 top part is the power supply)

My problem 's video :   https://www.youtube.com/watch?v=oZOkMZSDCR8&feature=youtu.be

China NewBoy:
my SchDoc Pdf

China NewBoy:
my PCB Doc , hope the problem solved :-+

China NewBoy:
sorry,i forget to mention that the PSU part is in the left upon of the SCHDoc ,and i think the circuit around OPA or tl431 is the key ,however, i just cant adjust it properly.

xavier60:
I think R19 should connect to the rail being  regulated, 24V.

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