bl8812b

{
  "slug": "bl8812b",
  "version": "0.1.0",
  "type": "component",
  "description": "BL Shanghai Belling AC-DC Controllers and Regulators, SOP-7. Datasheet-verified pinout, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "pmic",
    "bl8812b"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "bl8812b.kicad_sym",
    "bl8812b.kicad_mod",
    "bl8812b.glb",
    "bl8812b.step",
    "bl8812b.lbr",
    "docs/hero.png",
    "docs/bl8812b-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "bl8812b-etched.step"
  ],
  "visibility": {
    "public": true
  },
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "component": {
    "mpn": "BL8812B",
    "manufacturer": "BL Shanghai Belling",
    "package": "SOP-7",
    "pin_count": 7,
    "category": "AC-DC Controllers and Regulators",
    "parts": {
      "symbol": "bl8812b.kicad_sym",
      "footprint": "bl8812b.kicad_mod",
      "model_3d": "bl8812b-etched.glb",
      "model_3d_plain": "bl8812b.glb",
      "model_3d_step": "bl8812b-etched.step",
      "model_3d_step_plain": "bl8812b.step",
      "lbr": "bl8812b.lbr"
    },
    "pins": [
      {
        "number": "1",
        "name": "VDD",
        "type": "power_in",
        "description": "Chip supply pin. Powered from an auxiliary winding via a rectifier; a startup resistor from bulk rail charges the VDD capacitor. Recommended operating VDD ≤ 27 V (typ); UVLO(on) ≈ 7.0 V, UVLO(off) ≈ 16.0 V; VDD OVP ≈ 28 V; absolute max −0.3 V to 28.5 V."
      },
      {
        "number": "2",
        "name": "FB",
        "type": "input",
        "description": "Output voltage feedback input. Senses the auxiliary-winding reflected voltage through an external R2/R1 divider; internal reference Vref-FB ≈ 2.5 V (2.475-2.525 V). Includes cable-drop (line-loss) compensation via Icomp ≈ 45 µA and CC-mode shutdown when FB < 1.55 V for 1024-2048 cycles; FB OVP ≈ 3.3 V. Absolute max −0.3 V to 7.0 V."
      },
      {
        "number": "3",
        "name": "NC",
        "type": "unconnected",
        "description": "No connect. Pin must be left floating (悬空); all-pin open-circuit protection is provided by the chip."
      },
      {
        "number": "4",
        "name": "CS",
        "type": "input",
        "description": "Transformer primary-side current sense input. Connected to an external sense resistor Rcs to GND; cycle-by-cycle OCP threshold Vth-ocp ≈ 500 mV (min) / 590 mV (max). Internal 300 ns leading-edge blanking (LEB) removes turn-on spike, so no external RC filter is required. Absolute max −0.3 V to 7.0 V."
      },
      {
        "number": "5",
        "name": "Drain",
        "type": "power_out",
        "description": "Drain of the integrated 650 V / 2 A high-voltage power MOSFET (Rds(on) ≈ 4.1 Ω). Pins 5 and 6 are internally tied to the same MOSFET drain and both must be connected to the transformer primary winding to share current and improve thermal dissipation."
      },
      {
        "number": "6",
        "name": "Drain",
        "type": "power_out",
        "description": "Drain of the integrated 650 V / 2 A high-voltage power MOSFET (Rds(on) ≈ 4.1 Ω). Pins 5 and 6 are internally tied together; both should be connected to the transformer primary switching node."
      },
      {
        "number": "7",
        "name": "GND",
        "type": "power_in",
        "description": "Chip ground reference (芯片地). Return for the controller logic and the source of the internal power MOSFET / current-sense circuitry."
      }
    ],
    "provenance": {
      "rebuilt": "component block rebuilt 2026-10-05 from this page's own README pinout table and .kicad_sym (pins cross-checked), no re-extraction"
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "distributor_links": {
      "lcsc": "C7435970",
      "digikey": false,
      "mouser": false
    },
    "distributor_check": {
      "checked_at": "2026-10-05T18:54:33Z",
      "source": "Component Ocean /api/assign-pns + lcsc_map",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "models_3d": [
      {
        "file": "bl8812b.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          5.4,
          4.9,
          1.1
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "4c9435ffd3683a4ae45655e397c25900eda4f6782a526780f4f7b7b99a32dca7",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "bl8812b-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          5.4,
          4.9,
          1.1
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "2bcd93568234b76c2abf8e2cb5023f5b1d25ce1b35a5c4e08957c946e5a785bf",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}