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LM3414HV: Min on Time of 400ns

Part Number: LM3414HV

I am trying to use the LM314HV for a home lighting system where the Vf could be as low as 5.32 and as high as 44.3. Vin max would be 53 v. I led is 1000ma. After going through all the calculations, this does not seem to be possible with this device. am I missing something.