OB6561PCPA

@@ -0,0 +1,50 @@+# OB6561PCPA++**OB On Bright Elec** · PFC Controllers · SOP-8++OB6561PCPA 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 | INV | input | Inverting input of the internal error amplifier. Connected to a resistor divider from the boost output to sense system output voltage; reference is 2.5 V typ. Also used for system open-loop protection (threshold ~0.25 V). |+| 2 | COMP | output | Error amplifier output. External loop compensation network (RC) is placed between COMP and INV. Also used for dynamic/static OVP sensing (source current ~40 uA triggers dynamic OVP; static threshold 2.25 V). |+| 3 | MULT | input | Multiplier input. Connected via resistor divider to the rectified line voltage (after bridge diodes) to provide a sinusoidal reference to the current loop. Linear operating range 0 to 3.5 V. |+| 4 | CS | input | Current sense input. Connected to the MOSFET source current-sense resistor; internal 40 kOhm/8 pF RC filter and 1.7 V clamp. Feeds the PWM current-sense comparator for cycle-by-cycle current limiting. |+| 5 | ZCD | input | Zero-current detection input from the auxiliary/ZCD winding. Rising-edge threshold ~1.9 V triggers the next switching cycle (TM operation). Tying ZCD to GND (Vdis threshold 150-350 mV) disables the device. Absolute I_ZCD limits: 50 mA source / -10 mA sink. |+| 6 | GND | power_in | Device ground. Common return for signal, control, and gate-driver currents. |+| 7 | GD | output | Gate driver output. Totem-pole driver for external power MOSFET; VoH >= 8 V @ 100 mA, VoL <= 1.5 V @ 100 mA. Rise ~80 ns / fall ~30 ns into 1 nF. High-state clamp Voclamp ~16 V protects the MOSFET gate. |+| 8 | VCC | power_in | DC supply voltage. Operating range 9.5 V to 28 V (post-startup 11 V to 28 V); UVLO turn-on ~12 V, turn-off ~9.5 V (hysteresis ~2.5 V). Internal zener clamp ~33 V; absolute max 30 V. Start-up current ~35 uA, operating Icc ~4 mA. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | OB On Bright Elec |+| Package | SOP-8 |+| Category | Power Management (PMIC) |+| Pins | 8 |++## Ordering variants++Same part, different packaging or reel option.++- `OB6561PCPA`+- `OB6561PCPAP`++## CAD (KiCad official)++- Symbol: `OB6561PCPA`+- 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/ob6561pcpa-datasheet.pdf) (13 pp, sha256 `05fddf1ba88a0fb3`, 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/ob6561pcpa-datasheet.pdf)

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