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UCC28064EVM-004: Inductor, Dot, Rotation

jaeyup jung
Intellectual 570 points
Part Number: UCC28064EVM-004
Other Parts Discussed in Thread: UCC28064A

UCC28064A를 사용한 EVM 3가지를 비교해봤습니다.

300W, 500W, 700W의 회로도를 보게되면 300W와 "500W, 700W"의 인덕터 닷 방향이 달랐습니다.

<300W>

<500W>

<700W>

3개의 EVM 모두 보조권선이 접지로 향하는 건 동일하지만, 300W의 닷은 인덕터의 왼쪽에 있고, 500W와 700W는 오른쪽에 위치하였습니다.

정확한 기준이 무엇인지 알고 싶습니다.

그리고 닷방향이 회로도와 다르게 되면 어떠한 현상이 생기는 지 알고 싶습니다.

  • 0
    TI__Mastermind 27135 points

    Hi Jaeyup,

    Thanks for reaching out. When the MOSFET is off, the voltage across the inductor should be equal to Vout - Vin. During this time, the ZCD pin voltage should be positive. All 3 designs are hooked up correctly. Either dot orientation is ok as long as the ZCD signal is connected to the correct pin on the winding to have a positive voltage when the MOSFET is off.

    Best Regards,

    Ben Lough