OC5021B

@@ -0,0 +1,42 @@+# OC5021B++**OCX** · LED Drivers · SOT-23-6++OC5021B from OCX, in a SOT-23-6. 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 | DRV | output | Gate drive output for the external N-channel MOSFET switch. Typical drive voltage ~5.5V (clamped by internal VDD regulator). Rise/fall times ~50ns into 500pF; minimum on-time 250ns. |+| 2 | VSS | power_in | Device ground reference. Also the low side of the CS current sense; the trace from RCS to VSS and CS should be kept short and thick to minimize parasitic resistance. |+| 3 | DIM | input | Dimming input, supports both PWM and linear dimming. DIM tied to GND shuts off the LED output; DIM > 3.1V gives 100% output current; linear dimming range is 1.1V-3.1V (shutdown threshold ~0.9V). Must not be left floating; tie high if unused. For linear dimming, add a small capacitor (>=10nF) to ground. |+| 4 | VDD | power_in | Chip supply pin, fed from VIN through an external series resistor RVDD. Internally clamped to ~5.5V by an integrated shunt regulator (max clamp current 10mA). UVLO ~2.6V rising with ~0.4V hysteresis; typical operating current 1.3mA at 200kHz. |+| 5 | TOFF | input | Off-time setting pin. External capacitor COFF to ground sets fixed off-time per TOFF = 0.51 * 150k * (COFF + 8pF) + 61ns. With no external cap, internal off-time defaults to 650ns. |+| 6 | CS | input | Inductor peak current sense input, connects to the top of the external current-sense resistor RCS. Peak-current comparator threshold VCS_TH = 245/255/265 mV (min/typ/max). When VCS reaches threshold, DRV turns off the external MOSFET. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | OCX |+| Package | SOT-23-6 |+| Category | LED-drv |+| Pins | 6 |++## CAD (KiCad official)++- Symbol: `OC5021B`+- Footprint: `Package_TO_SOT_SMD:SOT-23-6`+- 3D model: SOT-23-6 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [OCX datasheet](docs/oc5021b-datasheet.pdf) (7 pp, sha256 `2c27bff9309b1edf`, 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/oc5021b-datasheet.pdf)

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