OB3330XCPA

@@ -0,0 +1,48 @@+# OB3330XCPA++**OB On Bright Elec** · LED Drivers · SOP-8++OB3330XCPA from OB On Bright Elec, 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 | ZCD | input | Zero-current detection input, connected to the auxiliary winding via a resistor divider. Triggers a new PWM cycle when the voltage falls below the 0.3 V demagnetization threshold. Also monitors output OV (>4 V) and LED-short (<0.9 V for 10 ms) conditions. Absolute max -1 V to 7 V. |+| 2 | OCP_TH | bidirectional | OCP threshold-level setting pin. Sources ~28 uA (17-39 uA); an external resistor to GND programs the cycle-by-cycle peak-current limit: 0 Ω = 2.1 V, 33 kΩ = 1.8 V, 110 kΩ = 1.5 V. Absolute max -0.7 V to 7 V. |+| 3 | MULT | input | Analog multiplier input; senses the rectified AC half-wave via a resistor divider to shape the CS threshold for PFC. Working range 0-3 V, multiplier DC gain K ~0.91 1/V. Absolute max -0.7 V to 7 V. |+| 4 | COMP | bidirectional | Error-amplifier output / loop compensation pin. Clamped between 1.2 V and 6 V; EA gm ~80 uS, DC gain 60-70 dB, source/sink 32/100 uA. Connect an RC network to GND. Absolute max -0.7 V to 7 V. |+| 5 | CS | input | Primary-side current-sense input from the MOSFET-source resistor Rcs. Integrated 300 ns leading-edge blanking; propagation delay ~100 ns from OCP comparator to gate. LED current: ILED = (N/2)·(400 mV/Rcs). Absolute max -0.7 V to 7 V. |+| 6 | GND | power_in | Device ground reference for all internal circuitry and the CS return path. |+| 7 | GATE | output | Totem-pole gate-drive output for the external power MOSFET. Voh ≥8 V, Vol ≤1.5 V @ 100 mA; internally clamped to ~11-12.5 V to protect the MOSFET gate. Tr ~80 ns, Tf ~30 ns into 1 nF. Absolute max -0.7 V to 40 V. |+| 8 | VCC | power_in | IC supply, typically fed from an auxiliary winding via a startup resistor. UVLO(OFF/on) 15.2 V rising, UVLO(ON/off) 9 V falling; OVP at 30 V. Startup current ~5 uA (max 15 uA), operating current ~1.5-2.5 mA. Absolute max -0.3 V to 40 V. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | OB On Bright Elec |+| Package | SOP-8 |+| Category | LED-drv |+| Pins | 8 |++## Ordering variants++- `OB3330XCPA`++## CAD (KiCad official)++- Symbol: `OB3330XCPA`+- 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:** [OB On Bright Elec datasheet](docs/ob3330xcpa-datasheet.pdf) (10 pp, sha256 `d2bab31d1ea8b9a2`, 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/ob3330xcpa-datasheet.pdf)

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