smps flyback controller ic

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I am a nub is smps and just completed my first breadboard isolated smps with 24 volt input. I used the SG6848D controller from Ebay. Anyone has any suggestions for a better IC.
Just some details

Input voltage 24 volts Output 5.
Used an opto coupler for feedback.
The transformer seems to work okay. I designed it for 3 amps. The problem is when I exceed 2 amps the signal gets very jittery and it stops functioning. I was able to go to 3 amps with no feedback using a pulse generator. Even higher but no regulation.

Any helpful suggestion will be appreciated.
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  1. cshahc56's Avatar
    i suggest you go for old work horse SG3525. It will give you efficient push pull configuration with all the feedback options.