copilot

1. Select a Switch: Choose an SPST switch that can handle the current and voltage requirements of your Raspberry Pi 4. For example, the Raspberry Pi 4 can draw up to 3A under maximum load at 5V. Ensure the switch is rated for at least 3A at 5V.
2. Add the Switch to Your Schematic:
   • Designator: SW1
   • Pins: 2 (typically named, 1 and 2 or IN and OUT)
   • Element Properties:
     • Designator Prefix: SW
     • Manufacturer Name: (Choose based on availability and preferences)
     • License: https://creativecommons.org/licenses/by/4.0/

• Location: It's efficient to place the switch close to where the power enters the Hat to easily control power to the entire board.
• Connections:
  1. Disconnect J1:VBUS from directly connecting to the +5V PowerNet and instead connect it to one terminal of the switch.
     • Connect J1:VBUS to SW1:1
  2. Connect the other terminal of the switch to the +5V PowerNet to distribute power when the switch is closed.
     • Connect SW1:2 to +5V:P1

copilot

1. For Moderate Inductance and High Current Applications:
   • Bourns Part No.: SRR1210-270M
     • Inductance: 27 µH
     • I rms (A): 5.0
     • I sat (A): 4.2
2. For High Inductance and Moderate Current Applications:
   • Bourns Part No.: SRR1210-680M
     • Inductance: 68 µH
     • I rms (A): 3.0
     • I sat (A): 2.7
3. For Low Inductance and Very High Current Applications:
   • Bourns Part No.: SRR1210-1R8Y
     • Inductance: 1.8 µH
     • I rms (A): 10.2
     • I sat (A): 13.2
4. For High Inductance and Low Current Applications:
   • Bourns Part No.: SRR1210-820M
     • Inductance: 82 µH
     • I rms (A): 2.8
     • I sat (A): 2.5

copilot

graph TD;
    L1["L1 (Inductor)"] --- |"P1"| FatPath["abb6c0094b0f5d45c059501b1638c974"];
    L1 --- |"P2"| L1_to_U1_FB["2e79598adb9cc0973589b99d9a0262d4"]

    subgraph abb6c0094b0f5d45c059501b1638c974[""Net: abb6c0094b0f5d45c059501b1638c974""];
        C1["C1 (0.01u)"] --> D1["D1 (PDS760-13)"];
        U1_SW["U1:SW (LM2678SD-5.0/NOPB)"] --> L1;
        L1 --> U1_SW;
    end

    subgraph node_2e79598adb9cc0973589b99d9a0262d4[""Net: node_2e79598adb9cc0973589b99d9a0262d4""];
        L1_to_U1_FB --> U1_FB["U1:FB (LM2678SD-5.0/NOPB)"];
        L1_to_U1_FB --> C2["C2 (100u)"];
        L1_to_U1_FB --> J1_VBUS["J1:VBUS"];
        L1_to_U1_FB --> J2_VBUS["J2:VBUS"];
    end

    U1_SW --> SW_to_D1["9cb2b1d3207df54b01c1f6e4302a6654"];

    subgraph node_9cb2b1d3207df54b01c1f6e4302a6654[""Net: node_9cb2b1d3207df54b01c1f6e4302a6654""];
        D1 --> |"A1, A2"| SW_to_D1;
        SW_to_D1 --> |"Connection to load and feedback network"| Load["To Load and Feedback Network"];
    end

• The blocks represent components and their respective MPNs when available or specified.
• The connecting lines (--- and -->) represent electrical connections between components, with the line labels indicating the pin or the net number associated with that connection.
• Due to the limitations of text representation, the precise layout of nets and their connections are simplified. The diagram illustrates L1's pivotal role in the buck converter configuration surrounding U1, C2's interaction with the 5V supply, and D1's connection to the switching node managed by U1.
• "P1" and "P2" next to edges represent the connection points to and from L1 in the respective nets.