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ob2500ncpa

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OB On Bright Elec AC-DC Controllers and Regulators, SOP-7. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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OB2500NCPA

OB On Bright Elec · AC-DC Controllers and Regulators · SOP-7

OB2500NCPA from OB On Bright Elec, in a SOP-7. 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 VDD power_in Chip power supply. Recommended operating range 8 V to 25 V; UVLO_ON ≈ 7.0 V, UVLO_OFF ≈ 18.2 V, VDD OVP ≈ 27 V. Typically fed from a transformer auxiliary winding via a rectifier and hold-up capacitor after start-up.
2 FB input Voltage feedback input from the auxiliary winding. Connected to a resistor divider that reflects the output voltage; the sample is compared against Vref = 2.500 V for CV regulation and used for programmable cable-drop compensation and CC-mode shutdown (< 1.55 V for 1024-2048 cycles).
3 RT input External over-temperature sense input. Connect an NTC thermistor from RT to GND; an internal ~72 µA source current develops a voltage, and OTP triggers when V(RT) falls below ~1.0 V.
4 CS input Current-sense input tied to the internal power MOSFET source. Connect an external sense resistor Rs from CS to GND to program the peak switch current and CC set-point; OCP threshold ranges from 500 mV (min) up to 590 mV (max) with on-time slope compensation. Includes an internal 300 ns leading-edge blanking.
5 Drain output Drain of the integrated 650 V / 1 A power MOSFET (Rds(on) ≈ 9 Ω). Connected to the transformer primary winding. Pins 5 and 6 are both tied to the same internal drain node and should be paralleled on the PCB for thermal dissipation.
6 Drain output Second bond to the drain of the integrated 650 V / 1 A power MOSFET. Tied internally to pin 5; both must be connected to the primary winding node and used together for current handling and heat sinking.
7 GND power_in Device ground reference and MOSFET source-return / control-ground.

Key specifications

Parameter Value
Manufacturer OB On Bright Elec
Package SOP-7
Category PMIC
Pins 7

Ordering variants

  • OB2500NCPA

CAD (KiCad official)

  • Symbol: OB2500NCPA
  • Footprint: Package_SO:SOIC-8-N7_3.9x4.9mm_P1.27mm
  • 3D model: SOP-7 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: OB On Bright Elec datasheet (None pp, sha256 176ddb19154735fc, 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

Symbol & Footprint

Schematic Symbol

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PCB Footprint

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Datasheet

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