Tool/software:
I hope this message finds you well.
I am writing to request clarification regarding the TIDA-010949 reference design.
1. Power Limitation
In the TIDA-010949 PDF, the design is stated to be limited to 600 W.
However, other sections indicate operation up to 80 V and 18 A (1,440 W).
After reviewing the schematic, the components appear rated for 80 V / 18 A.
- Which element(s) in the design enforce the 600 W limitation?We plan to apply this design to a 700 W PV panel.
- What specific modifications are required to ensure safe, reliable operation at 700 W?
- Is the limitation driven by PCB layout (trace width, copper weight, thermal via density, creepage/clearance, current sharing, etc.) and would reinforcing the layout enable 700 W?
2. Inductor Specification (L1 in Power Stage)
In the latest design files, L1 is indicated as SER2013 (3.6 µH), while the separate Excel BOM lists 7443641000 (10 µH). We built the board per the reference design using SER2013 (3.6 µH). During PWM testing, the inductor overheated and the board failed. After replacing it with a larger 6.8 µH inductor we had on hand, the board operated normally.
- Which inductance and specific part do you recommend for best efficiency and stable operation in this design?
- Is 7443641000 (10 µH) in the Excel BOM the correct choice, or does TI recommend a different value/part (considering ripple current, saturation, DCR, SRF, and thermal performance)?
3. Inductor Specification (L4 in PLC Analog Front-End)
For the PLC path, L4 is shown as the same SER2013 (3.6 µH) used for L1 in the design files, while the Excel BOM lists 74435581200 (12 µH, 19 A).
- Which inductor (value and part number) do you recommend for stable PLC operation in this reference design?
- Are there specific requirements we should meet (e.g., core material to minimize distortion, target impedance over the PLC band, SRF margin, DCR/thermal limits, and EMI compliance considerations)?
- If the recommended choice depends on the PLC band (e.g., CENELEC A/B/C/D or frequency plan used in TIDA-010949), please advise the optimal L value and part selection for that band and expected line conditions.