# OB5686ACPA

**OB On Bright Elec** · LED Drivers · SOP-8

OB5686ACPA from OB On Bright Elec, in a SOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | FB | input | Output voltage feedback input (ITh) used for CV regulation and quasi-resonant detection, with an absolute range of -1 V to 7 V. |
| 2 | GND | power_in | Power ground for the controller and the reference for the CS resistor and BRC network. |
| 3 | NC | unconnected | No internal connection; leave unconnected. |
| 4 | HV | power_in | High-voltage power supply input for the HV start-up circuit, rated -0.3 V to 700 V. |
| 5 | BRC | bidirectional | Line brownout and line over-voltage setting pin; GND gives 140 Vac brownout and 323 Vac OVP, a 10 kΩ to GND disables both, and floating gives 71 Vac brownout and 323 Vac OVP, with an absolute range of -0.3 V to 7 V. |
| 6 | CS | input | Current sense input for cycle-by-cycle current limiting, with an absolute range of -0.3 V to 7 V and 420 ns leading edge blanking. |
| 7 | GATE | output | Gate driver output for the power MOSFET, clamped internally to about 12 V with an absolute range of -0.3 V to 40 V. |
| 8 | VDD | power_in | Power supply for the controller, with UVLO exit at 16.2 V (rising), UVLO entry at 8 V (falling), and an absolute range of -0.3 V to 40 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | OB On Bright Elec |
| Package | SOP-8 |
| Category | LED Drivers |
| Pins | 8 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Error Amplifier Reference Voltage | Vref | 2.45 | 2.5 | 2.55 | V |  | 5 |
| HV Voltage | HV | -0.3 |  | 700 | V |  | 3 |
| VDD Voltage | VDD | -0.3 |  | 40 | V |  | 3 |
| GATE Voltage | GATE | -0.3 |  | 40 | V |  | 3 |
| CS Input Voltage | CS | -0.3 |  | 7 | V |  | 3 |
| BRC Input Voltage | BRC | -0.3 |  | 7 | V |  | 3 |
| FB Input Voltage | FB | -1 |  | 7 | V | Negative amplitude -1V only when max negative current is less than 10mA (Note 2) | 3 |
| Min/Max Operating Junction Temperature | TJ | -40 |  | 150 | ℃ |  | 3 |
| Operating Ambient Temperature | TA | -20 |  | 85 | ℃ |  | 3 |
| Min/Max Storage Temperature | Tstg | -55 |  | 150 | ℃ |  | 3 |
| Lead Temperature (Soldering) |  |  |  | 260 | ℃ | 10 s soldering | 3 |
| Package thermal resistance, junction to ambient (SOP8) | RθJA |  | 90 |  | ℃/W | SOP8 package | 3 |
| Static current | IVDD_op |  | 850 |  | uA | VDD=20V | 5 |
| VDD under voltage Lockout Exit | UVLO_off |  | 16.2 |  | V | VDD rising | 5 |
| VDD under voltage Lockout Enter | UVLO_on |  | 8 |  | V | VDD falling | 5 |
| VDD overvoltage protection | VDD_ovp |  | 32 |  | V |  | 5 |
| Output overvoltage protection | Vth_ovp |  | 3.2 |  | V |  | 5 |
| Output short protection | Vth_scp |  | 0.4 |  | V |  | 5 |
| Leading Edge Blanking time | TLEB |  | 420 |  | ns |  | 5 |
| Over current threshold voltage | Vth_ocp |  | 0.6 |  | V | Ton=0us | 5 |
| Maximum Frequency | Fmax |  | 120 |  | KHz |  | 5 |
| Minimum off time | Toff_min |  | 2 |  | us |  | 5 |
| Maximum off time | Toff_max |  | 110 |  | us |  | 5 |
| Maximum on time | Ton_max |  | 20 |  | us |  | 5 |
| Minimum frequency | Fmin |  | 500 |  | Hz | Rcs_fmin>2.5kohm | 5 |
| Line over voltage protection @ startup | Line_ovp_startup |  | 311 |  | Vac |  | 5 |
| Line over voltage protection @ normal operation | Line_ovp_normal |  | 323 |  | Vac |  | 5 |
| Brown-out |  |  | 140 |  | Vac | RBRC=GND | 5 |
| Brown-in |  |  | 154 |  | Vac | RBRC=GND | 5 |
| Brown-out |  |  | 71 |  | Vac | RBRC Floating | 5 |
| Brown-in |  |  | 83 |  | Vac | RBRC Floating | 5 |
| Over temperature protection | OTP |  | 150 |  | ℃ |  | 5 |
| Gate output clamping voltage | Vclamp |  | 12 |  | V |  | 5 |
| Rising edge time | Tr |  | 80 |  | ns | CL=1nF | 5 |
| Falling edge time | Tf |  | 30 |  | ns | CL=1nF | 5 |

## CAD (KiCad official)

- Symbol: `OB5686ACPA`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `ob5686acpa-etched.step` / `ob5686acpa-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ob5686acpa.step` / `ob5686acpa.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [OB On Bright Elec datasheet](docs/ob5686acpa-datasheet.pdf) (12 pp, sha256 `80d91c570c87c1f1`, retrieved 2026-10-17, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/ob5686acpa-datasheet.pdf)