V out dropped!!?? (boost regulator)

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krizy

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i design boost regulator within specification :
Vin = 8 - 15 V dc (from solar cell)
Vout = 48 V dc
I out = 0,6 A

and using IC MC34060

my problem is when the circuit get loaded Vout drop 'til 20 -30 V dc..and the current (I out) can't reach the maximum value (0,6 A)...
So, anyone can help me how to fix my problem...pliz..Coz this is my final project, i really need ur help..ThnX b4
 

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