bl8812b

@@ -0,0 +1,43 @@+# BL8812B++**BL Shanghai Belling** · AC-DC Controllers and Regulators · SOP-7++BL8812B from BL Shanghai Belling, in a SOP-7. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | VDD | power_in | 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. |+| 2 | FB | input | 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. |+| 3 | NC | unconnected | No connect. Pin must be left floating (悬空); all-pin open-circuit protection is provided by the chip. |+| 4 | CS | input | 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. |+| 5 | Drain | power_out | 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. |+| 6 | Drain | power_out | 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. |+| 7 | GND | power_in | Chip ground reference (芯片地). Return for the controller logic and the source of the internal power MOSFET / current-sense circuitry. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | BL Shanghai Belling |+| Package | SOP-7 |+| Category | PMIC |+| Pins | 7 |++## CAD (KiCad official)++- Symbol: `BL8812B`+- Footprint: `Package_SO:SOIC-8-N7_3.9x4.9mm_P1.27mm`+- 3D model: SOP-7 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [BL Shanghai Belling datasheet](docs/bl8812b-datasheet.pdf) (None pp, sha256 `d0338dc7e521fe4d`, retrieved 2026-08-17, tier: lcsc)+- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/bl8812b-datasheet.pdf)

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