DK912

@@ -0,0 +1,49 @@+# DK912++**Shenzhen DongKe Semicon** · AC-DC Controllers and Regulators · SOP-8++DK912 from Shenzhen DongKe Semicon, in a SOP-8. 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 | HV | power_in | High-voltage startup pin. Connects through an external ~2.2 MΩ resistor to the OC pins (7,8) to supply the internal high-voltage startup current source that charges the VDD storage capacitor. |+| 2 | IS | input | Peak current sense / limit setting pin. An external resistor Ris from IS to GND sets the maximum peak current: Ipmax = 400 mV / Ris (typical 660 mA). IS max turn-on threshold 360-440 mV; min 80-120 mV. |+| 3 | FB | input | Primary-side feedback input. Senses the reflected VOR voltage from the primary (or auxiliary) winding via an external resistor divider to regulate output voltage/current against the internal 2.5 V reference. Short-circuit threshold ~1.3 V, open-load protection ~3.7 V. |+| 4 | VDD | power_in | Chip positive supply. Requires an external 10 µF-47 µF capacitor to GND. Typical operating voltage 4.7 V (range 4-6 V); startup ~4.7 V; restart ~3.6 V; OVP ~6.2 V. Self-supply technology holds VDD near 4.7 V without an auxiliary winding. |+| 5 | GND | power_in | Ground reference for the controller and internal power MOSFET source. Pins 5 and 6 are internally common and both must be connected to system ground. |+| 6 | GND | power_in | Ground reference for the controller and internal power MOSFET source. Pins 5 and 6 are internally common and both must be connected to system ground. |+| 7 | OC | power_out | Drain of the internal 700 V high-voltage power MOSFET. Connects to the flyback transformer primary winding. Pins 7 and 8 are internally tied together; power MOSFET withstand voltage 700 V, peak current 700 mA. |+| 8 | OC | power_out | Drain of the internal 700 V high-voltage power MOSFET. Connects to the flyback transformer primary winding. Pins 7 and 8 are internally tied together; power MOSFET withstand voltage 700 V, peak current 700 mA. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Shenzhen DongKe Semicon |+| Package | SOP-8 |+| Category | PMIC |+| Pins | 8 |++## Ordering variants++- `DK912SOP`+- `DK912SOP8`++## CAD (KiCad official)++- Symbol: `DK912`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOP-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Shenzhen DongKe Semicon datasheet](docs/dk912-datasheet.pdf) (9 pp, sha256 `b6f27ef42f4a4f78`, 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/dk912-datasheet.pdf)

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