Hi Alexander,

Thanks for reaching out! TPS23734EVM is 5V active clamp forward converter. Please see design parameters suggestions for different topologies:

5V forward transformer:

 Turns ratio SEC : PRI : AUX = 1 : (4–6) : (2–2.8)

 Lm = 90–165 µH, Isat > 1.5 A

12V forward transformer: 

 Turns ratio SEC : PRI : AUX = 1 : (1.8–3) : (0.9–1.1)

 Lm = 90–165 µH, Isat > 1.5 A

5V flyback transformer:

 Turns ratio SEC : PRI : AUX : BIAS = 1 : (5–9) : (2–2.8) : (1–1.2)

 Lm = 50–150 µH, Isat > 2.6A @ Npri_min & Lm_min

12V flyback transformer:

 Turns ratio SEC : PRI : AUX : BIAS = 1 : (2–3.5) : (0.9–1.1) : (0.4–0.6)
 Lm = 50–150 µH, Isat > 2.6A @ Npri_min & Lm_min

Best regards,

Diang