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Transformers in Switched Mode Supplies

Transformers in Switched Mode Supplies

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Design a transformer for a Flyback converter with the following specifications:

  • Input voltage range: 18 V - 24 V
  • Output voltage range: 5V - 12V
  • Output current: 2A

Assume the following:

  • The converter will operate in discontinuous conduction mode
  • The switching frequency is 50 kHz

Important:

  • To minimize EMI the airgap shall be as small as possible
  • Set the target inductance to 80% of the lowest critical inductance to provide some design and manufacturing margin
  • Choose the turns ratio to maximize the duty cycle range, while ensuring that the duty-cycle never exceeds 40%

jlcpcb-quote.png

JLCPCB Quote page

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Routing.png

PCB routing

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Schematic.png

Circuit Schematic

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jlcpcb-smt-option.png

JLCPCB SMT Selection

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Layout.png

PCB Layout

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View all 13 files

  • 1 × PC47PQ20_16Z-22
  • 3 × GRM21BR71H104KA01L Capacitors / Ceramic
  • 1 × 1000pF Capacitor
  • 1 × 100pF Capacitor
  • 8 × EEHZA1H101P Capacitors / Aluminum Electrolytic

View all 28 components

  • 1
    Ordering the boards from JLCPCB

    For ordering the boards, go to JLCPCB.com (https://jlcpcb.com/RAT), and click on "Quote Now" button.

    JLCPCB (ShenzhenJLC Electronics Co., Ltd.), is the largest PCB prototype enterprise in China, and a high-tech manufacturer specializing in quick PCB prototype and small-batch PCB production. You can order a minimum of 5 PCBs for just $2.

    First: Upload the gerber files for the board by clicking the "Add gerber file" button. You’ll notice a message at the bottom if the file is successfully uploaded.

  • 2
    Step 2

    Second: In order to get the board assembled (optional, based on the project requirements), select the "SMT Assembly option. It is important to select the side of the PCB that needs to be assembled, as well as the quantity for SMT. Press the "Confirm" button, then press the "Next" button.

  • 3
    Step 3

    Third: upload the BOM (Bill of Material) and CPL (Component Placement List) files and click the "Next" button. It is necessary to make sure that each of these files follow the jlcpcb specified BOM and CPL formats.

    Note: If there is an issue with the BOM/CPL formatting, the the page will keep erroring out until it is resolved.

View all 8 instructions

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