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SMPS or Flyback Help Develping

Hello,

My goal is as follows.
Vin: 3.7 - 4.2 (single cell 18650 battery 2500mAH 25A)
Vout: 3 - 5
max Amps out: 10
I will be connecting a small heating element 2mm x 8mm in resistances from 0.2ohm to 1.8ohm. I would like to control the power setting from my Arduino.


Thank You, John