Other Parts Discussed in Thread: UCC24612, , LMG2610
Tool/software:
Subject: Transformer Design Guidance for 60W Adapter using UCC28780, UCC24612, and LMG2610
Message:
Dear TI Support Team,
I am currently designing a 60W isolated AC-DC converter with the following specifications:
- Input Voltage: 85–265Vac, 60Hz (single-phase wide range)
- Output Voltage/Current: 12V, 5A (60W)
- Primary-side Controller: UCC28780
- Synchronous Rectifier Controller: UCC24612
- Integrated GaN Driver IC: LMG2610
For the transformer design, I plan to use:
- Core: EFD25/13/9 (3F36 material)
- Bobbin: CSH-EFD25-1S-10P-TZ
I would greatly appreciate your guidance on the following points:
1. How should I determine the optimal turns ratio (Np:Ns:NA) for primary, auxiliary, and secondary windings for this configuration?
2. Could you provide guidance or recommendations for selecting the exact number of turns for each winding based on UCC28780 design considerations (Dmax, ZVS, etc.)?
3. What wire gauge (AWG) or winding technique would you recommend for each winding to meet current density, skin effect, and thermal considerations at this power level?
4. Are there any specific layout or transformer design tips for maximizing efficiency and ensuring proper operation with LMG2610 and UCC24612 in this topology?
This is our schematic. Please use as a reference it.
Thank you for your support.