DC to DC converter circuit help

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Hi friends,

I am working on DC to DC converter Power supply.
my input voltage range is 18 to 75 VDC and output is +5 VDC.
My circuit works well above 21 VDC,but i need a range above 18 VDC.
I have attached my schematic as an image and also as an PDF format.
so please give me some guide line for that

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DC METER SMPS.pdf20.73 KB