bl8812b

@@ -33,5 +33,72 @@   "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"+    }   }-}\ No newline at end of file+}