# OB2535CPA

**OB On Bright Elec** · AC-DC Controllers And Regulators · SOP-8

OB2535CPA 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 | VDD | power_in | Power supply pin: the output shuts down when VDD falls below UVLO(ON) of 8.2-10.5 V, and VDD is clamped at VDD_clamp of 27-30 V (IDD=10 mA) with VDD OVP at 26-29 V. |
| 2 | COMP | input | Loop compensation pin for CV stability; its voltage sets the cable-drop compensation current into INV, with a maximum of 37.5 uA at INV=2 V, COMP=0 V. |
| 3 | INV | input | Voltage feedback input from the auxiliary winding through a resistor divider, compared against a 2.00 V reference (1.97-2.03 V), with PWM duty set by the EA output and the current sense signal at CS. |
| 4 | CS | input | Current sense input for the switch current; the over-current threshold is 880-940 mV (910 mV typical) with 625 ns leading-edge blanking, 110 ns propagation delay and 50 kOhm input impedance, and the external sense resistor Rs sets the CC point. |
| 5 | DRAIN | output | HV MOSFET drain connected to the primary lead of the transformer, with a drain-source breakdown voltage (BVdss) of 600 V. |
| 6 | DRAIN | output | HV MOSFET drain connected to the primary lead of the transformer, with a drain-source breakdown voltage (BVdss) of 600 V. |
| 7 | GND | power_in | Ground reference pin; the datasheet gives no additional electrical limits for this pin. |
| 8 | GND | power_in | Ground reference pin; the datasheet gives no additional electrical limits for this pin. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | OB On Bright Elec |
| Package | SOP-8 |
| Category | Power Management (PMIC) |
| 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 |
|---|---|---|---|---|---|---|---|
| Standby Current | I DD ST |  | 5 | 20 | uA | VDD=13V | 5 |
| Operation Current | I DD op |  | 2 | 3 | mA | INV=2V, CS=0V, VDD=VDDG=18V | 5 |
| VDD Under Voltage Lockout (enter, falling) | UVLO(ON) | 8.2 | 9 | 10.5 | V | Enter VDD falling | 5 |
| VDD Under Voltage Lockout (exit, rising) | UVLO(OFF) | 13.5 | 14.8 | 16 | V | Exit VDD rising | 5 |
| Maximum VDD operation voltage (clamp) | VDD_clamp | 27 | 28.5 | 30 | V | IDD=10mA | 5 |
| Over voltage protection threshold | OVP | 26 | 27.5 | 29 | V | Ramp VDD until gate shut down | 5 |
| LEB time | TLEB |  | 625 |  | ns |  | 5 |
| Over current threshold | Vth_oc | 880 | 910 | 940 | mV |  | 5 |
| OCP Propagation delay | Td_oc |  | 110 |  | ns |  | 5 |
| Input Impedance | ZSENSE_IN |  | 50 |  | Kohm |  | 5 |
| Soft start time | T_ss |  | 17 |  | ms |  | 5 |
| IC Maximum frequency | Freq_Max | 55 | 60 | 65 | KHz |  | 5 |
| System nominal switch frequency | Freq_Nom |  | 50 |  | KHz |  | 5 |
| Startup switch frequency | Freq_startup |  | 14 |  | KHz | INV=0V, Comp=5V | 5 |
| Frequency shuffling range | △f/Freq | -6 |  | 6 | % |  | 5 |
| Reference voltage for EA | Vref_EA | 1.97 | 2 | 2.03 | V |  | 5 |
| DC gain of EA | Gain |  | 60 |  | dB |  | 5 |
| Max. cable compensation current | I_COMP_MAX |  | 37.5 |  | uA | INV=2V, Comp=0V | 5 |
| MOSFET Drain-Source Breakdown Voltage | BVdss |  | 600 |  | V |  | 5 |
| On Resistance | Rdson |  | 12 | 15 | Ώ | Static, Id=0.4A | 5 |
| Drain Voltage (off state) |  | -0.3 |  |  | V | Maximum is Bvdss (not a numeric value in datasheet) | 2 |
| VDD Voltage |  | -0.3 |  |  | V | Maximum is VDD_clamp (not a numeric value in datasheet) | 2 |
| VDD Zener Clamp continuous current |  |  |  | 10 | mA | Continuous current | 2 |
| COMP Voltage |  | -0.3 |  | 7 | V |  | 2 |
| CS Input Voltage |  | -0.3 |  | 7 | V |  | 2 |
| INV Input Voltage |  | -0.3 |  | 7 | V |  | 2 |
| Max Operating Junction Temperature | TJ | -40 |  | 150 | °C |  | 2 |
| Storage Temperature | Tstg | -55 |  | 150 | °C |  | 2 |
| Lead Temperature (Soldering) |  |  |  | 260 | °C | Soldering, 10 secs | 2 |
| Thermal resistance junction to ambient (SOP8) | RθJA |  | 90 |  | ℃/W | Drain pin connected to 100mm2 PCB copper clad | 2 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | copper |  | Note: Drain Pin Connected 100mm2 PCB copper | 2 |

## CAD (KiCad official)

- Symbol: `OB2535CPA`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `ob2535cpa-etched.step` / `ob2535cpa-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ob2535cpa.step` / `ob2535cpa.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [OB On Bright Elec datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588883521222430720) (10 pp, sha256 `a63f62526a72215c`, retrieved 2026-10-18, 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/ob2535cpa-datasheet.pdf)