DK124

@@ -0,0 +1,43 @@+# DK124++**Shenzhen DongKe Semicon** · AC-DC Controllers and Regulators · DIP-8++DK124 from Shenzhen DongKe Semicon, in a DIP-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 | GND | power_in | Chip ground reference. Tied together with pin 2 to form the IC ground return. |+| 2 | GND | power_in | Chip ground reference. Tied together with pin 1 to form the IC ground return. |+| 3 | FB | input | Feedback control input. Sinks the optocoupler current (internal 40uA pull-up) to set the cycle-by-cycle peak current limit. FB=1.5V-2.5V linearly scales peak current; <1.33V triggers short-circuit/overload, >2.5V drops PWM to 22kHz, >2.8V enters burst standby. |+| 4 | VCC | power_in | Chip supply pin. Regulated by the internal patented self-supply circuit to ~5V (start 5.05V typ, restart 3.6V typ, OVP 6.55V typ). External VCC storage capacitor is charged from OC via the internal high-voltage current source. Absolute max 8V. |+| 5 | OC | output | Drain of the internal 700V power MOSFET. Pins 5,6,7,8 are internally tied together for current-handling and thermal dissipation and connect to the transformer primary. Peak switch current limited to 1.3A typ; OC OVP trips at 600V typ. |+| 6 | OC | output | Drain of the internal 700V power MOSFET (paralleled with pins 5,7,8). |+| 7 | OC | output | Drain of the internal 700V power MOSFET (paralleled with pins 5,6,8). |+| 8 | OC | output | Drain of the internal 700V power MOSFET (paralleled with pins 5,6,7). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Shenzhen DongKe Semicon |+| Package | DIP-8 |+| Category | PMIC |+| Pins | 8 |++## CAD (KiCad official)++- Symbol: `DK124`+- Footprint: `Package_DIP:DIP-8_W7.62mm`+- 3D model: DIP-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Shenzhen DongKe Semicon datasheet](docs/dk124-datasheet.pdf) (7 pp, sha256 `685d94645ea5e49a`, retrieved 2026-08-17, tier: lcsc)+- **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/dk124-datasheet.pdf)

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