I would like to hand wind a smps transformer for prototyping work. The specs of the transformer are as follows :
Core Material: EE16, NC-2H or equivalent, gapped for ALG of 88.55 nH/t² Bobbin EE16, Horizontal, 10 pins, (5/5)
Shield: 15T x 3, 35 AWG
Primary: 105T, 35 AWG
1st Half Bias: 6T x 4, 30 AWG
2nd Half /Feedback: 6T x 4, 30 AWG
Secondary: 7T, 22 TIW
Shield (2–NC), Primary (4–1), Bias (5–3), Feedback (3–2), 5 V (10–8)
Primary Inductance 1.074 mH, ±10%
Primary Resonant Frequency 1000 kHz (minimum)
Leakage Inductance 95 μH (maximum)
I have procured EE16 core, bobin and the copper wires. Can anyone explain me how to actually go about winding this one? specifically:
- Which direction to start each winding CW / CCW ?
- What to do in cases where turns are very less to fill one layer?
- I have seen another transformer design where there were parallel coils connected to same terminals, In this case do we turn both coils side by side or on different layers?