component
oc5028b
Public Unreviewedby Ray
OCX LED Drivers, ESOP-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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markdownOC5028B
OCX · LED Drivers · ESOP-8
OC5028B 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 IC. Return path for the current-sense resistor RCS and the chip supply. |
| 2 | NC | unconnected | No connect. Leave floating (悬空不接). |
| 3 | DIM | input | Dimming input supporting both PWM and linear (analog) dimming. Tying DIM to ground disables the LED output; VDIM > 3.1V yields 100% output current; linear dimming range is 1.1V to 3.1V. DIM must not be left floating. |
| 4 | SW | output | Switch node connected to the drain of the internal 100V power MOSFET (RDSON ~210 mΩ at VGS=5V). Connects to the inductor / freewheeling diode of the buck converter. Exposed thermal pad is internally connected to this pin. |
| 5 | CS | input | Inductor peak current sense input. Connects to the top of the current-sense resistor RCS; switch turns off when VCS reaches the 250mV (typ) threshold (VCS_TH = 245/255/265 mV min/typ/max). |
| 6 | CS | input | Inductor peak current sense input (paralleled with pin 5). Route the RCS trace to both CS pins with wide, short traces to minimize parasitic resistance error. |
| 7 | TOFF | input | Off-time setting pin. A capacitor COFF from TOFF to GND sets the fixed off time: TOFF = 0.51 * 150kΩ * (COFF + 8pF) + 61ns. With no external cap, off-time defaults to ~650ns. |
| 8 | VDD | power_in | Chip supply pin. Fed from VIN through a series resistor RVDD; internally clamped by a shunt regulator to ~5.5V. UVLO rising threshold 2.6V with 0.4V hysteresis. Internal shunt clamp current must be kept <10 mA (IVDD_typ ≈ 2 mA). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | OCX |
| Package | ESOP-8 |
| Category | LED-drv |
| Pins | 8 |
CAD (KiCad official)
- Symbol:
OC5028B - Footprint:
Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm - 3D model: ESOP-8 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: OCX datasheet (None pp, sha256
4ba985b0d48b9a53, 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).