OC5128

@@ -0,0 +1,44 @@+# OC5128++**OCX** · LED Drivers · ESOP-8++OC5128 from OCX, in a ESOP-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 | Ground reference for the chip. Connect to system ground with a short, wide trace to the current sense resistor return. |+| 2 | VDD | power_in | Chip supply pin. Fed from VIN through an external supply resistor RVDD; an internal shunt regulator clamps VDD at ~5.8V (max clamp current 10mA). UVLO rising threshold 4.1V with 0.4V hysteresis. |+| 3 | NC | unconnected | No connect. Leave floating. |+| 4 | SW | output | Switch node; drain of the internal 100V power MOSFET. Connects to the inductor / freewheeling diode in the buck topology. Absolute maximum voltage 100V. The exposed thermal pad is internally tied to SW. |+| 5 | CS | input | Inductor current sense input. Average CS voltage is regulated to 200mV (192-208mV) across the sense resistor RCS; LED current ILED = 0.2V / RCS. Route to RCS and GND with short, wide traces. |+| 6 | MODE | input | Brightness (dimming) select input with internal ~80kΩ pull-down. Float or tie to GND → full-brightness (100% ILED). Tie to a logic high (VDD) → half-brightness (ILED/2). Absolute max −0.3V to VDD+0.3V. |+| 7 | NC | unconnected | No connect. Leave floating. |+| 8 | NC | unconnected | No connect. Leave floating. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | OCX |+| Package | ESOP-8 |+| Category | LED-drv |+| Pins | 8 |++## CAD (KiCad official)++- Symbol: `OC5128`+- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm`+- 3D model: ESOP-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [OCX datasheet](docs/oc5128-datasheet.pdf) (6 pp, sha256 `531c4e86661633eb`, 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/oc5128-datasheet.pdf)

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