component

OB2203CPA

Public Made by Adom

by adom

OB On Bright Elec AC-DC Controllers and Regulators, SOIC-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

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PCB Footprint

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Datasheet

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Contents

README

markdown

OB2203CPA

OB On Bright Elec · AC-DC Controllers and Regulators · SOIC-8

OB2203CPA from OB On Bright Elec, in a SOIC-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 SS bidirectional Soft-start programming pin. Program the soft-start rate with a capacitor to ground; after soft-start, the pin voltage is clamped at ~2V (Vss_clamp ~5.8V). Also acts as an external latch trigger input: latch triggers when SS pin voltage exceeds ~3.8V (V_latch_trigger).
2 FB bidirectional Feedback input pin. PWM duty cycle is determined by the voltage level on this pin combined with the current-sense signal at pin 3 (CS). The FB voltage also selects the operating mode among quasi-resonant (QR), pulse frequency modulation (PFM), and burst mode (BM). Input impedance ~4 kOhm; FB open voltage ~5.3 V.
3 CS input Current sense input from the source of the external power MOSFET (via a sense resistor). Internal Leading Edge Blanking ~350 ns. Cycle-by-cycle current limit thresholds: ~0.45 V at 0% duty, ~0.80 V at 60% duty.
4 GND power_in Ground for internal circuitry. Common return for VCC, gate driver, and signal pins.
5 GATE output Totem-pole gate drive output for the external power MOSFET. 1A peak sink/source capability. Output clamp voltage ~16.5 V (at VCC=20 V). Typical rise/fall times 50 ns / 20 ns with 1 nF load.
6 VCC power_in Chip DC power supply pin. Recommended operating range 12-23 V. UVLO(ON) startup at ~15 V, UVLO(OFF) at ~8.5 V; OVP triggers at ~31 V; internal Zener clamp at ~32 V (max 10 mA).
7 PFCVCC power_out PFC controller supply switch output. Connects to VCC via an internal low-impedance P-MOS switch (Rdson ~20 Ohm). During standby/startup the switch is open and PFCVCC is shut down; once the auxiliary winding is stable, PFCVCC is connected to VCC to power an external PFC controller. Shuts down on fault or at no/light load.
8 DEM input Input from the transformer auxiliary winding for demagnetization (valley) detection timing. Also used for load over-voltage protection (OVP): OVP trigger point ~3.75 V, sampled ~2 us after switch-off, requires 4 consecutive cycles for true OVP. Internally clamped -0.7 V to +5.8 V.

Key specifications

Parameter Value
Manufacturer OB On Bright Elec
Package SOIC-8
Category PMIC
Pins 8

Ordering variants

Same part, different packaging or reel option.

  • OB2203CPA
  • OB2203CPAAP

CAD (KiCad official)

  • Symbol: OB2203CPA
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D, STEP)
  • 3D model files: ob2203cpa-etched.step / ob2203cpa-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ob2203cpa.step / ob2203cpa.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
ob2203cpa.step 122 KB You want the bare part, or you mark your own boards.
ob2203cpa-etched.step 2.2 MB You want the part with OB2203CPA already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 529 faces against 147 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

  • Datasheet: OB On Bright Elec datasheet (13 pp, sha256 25d415ee55f38346, 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