component
bl8812b
Public Unreviewedby Ray
BL Shanghai Belling AC-DC Controllers and Regulators, SOP-7. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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markdownBL8812B
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 (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).