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

Same part, different packaging or reel option.

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 (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