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uneven pulses from uc2845

Other Parts Discussed in Thread: TL431

i am designing a isolated  flyback power supply using uc 2845.input voltae is =110v, output voltage is (24-40)v,5A. problem in my power supply is high noise  coming from the transformer & pulses of uc 2845 are not symmetrical,they are uneven.i am using moc8102&tl431 in my feedback design.plz solve my problm