component
UC3872DW
Public Made by Adomby adom
Texas Instruments Lighting Drivers & Controllers, SOIC-16-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownUC3872DW
Texas Instruments · Lighting Drivers & Controllers · SOIC-16-300mil
UC3872DW from Texas Instruments, in a SOIC-16-300mil. 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 | BOUT | output | Push-pull N-channel MOSFET drive output, complementary to AOUT, high 50% of the time and switching states on each zero-detect. |
| 2 | AOUT | output | Push-pull N-channel MOSFET drive output, complementary to BOUT, high 50% of the time and switching states on each zero-detect. |
| 3 | VC | power_in | Power supply for the output drivers (absolute max 24V); bypass to ground with a 0.1µF ceramic capacitor. |
| 4 | COMP | output | Error amplifier output; compensation components connect between COMP and INV, and a capacitor to ground limits turn-on current and blanks open lamp detect so the lamp can start. |
| 5 | SS | passive | Soft start pin that limits initial turn-on currents and blanks open lamp detect until soft start completes (soft start threshold 2.9 to 3.8V). |
| 6 | N/C | unconnected | No internal connection. |
| 7 | INV | input | Inverting input of the error amplifier and input to the open lamp detect circuit; outputs are disabled if INV is below the 1V open lamp detect threshold. |
| 8 | CT | passive | Timing capacitor to GND sets the synchronization frequency range; charged with approximately 200µA to form the ramp for the COUT PWM comparator. |
| 9 | ZD | input | Zero-detect input sensing the transformer primary center-tap voltage with a threshold of about 0.5V; connect through a resistor (typically 10k) to limit input current at turn-off. |
| 10 | N/C | unconnected | No internal connection. |
| 11 | REF | power_out | 3V reference output for internal logic; bypass to ground with a 0.01µF ceramic capacitor. |
| 12 | VCC | power_in | Positive supply for the chip, operating range 4.2V to 24V; bypass to ground with a 0.1µF ceramic capacitor. |
| 13 | ENBL | input | Enable input: high enables the device, low shuts the IC down to typically 1µA supply current (input high threshold 2V, low threshold 0.8V). |
| 14 | COUT | output | Directly drives the bulk regulator P-channel MOSFET, synchronized to each zero-detect at twice the AOUT/BOUT frequency, with smooth control up to 100% duty cycle. |
| 15 | PGND | power_in | High-current ground connection for the three output drivers. |
| 16 | GND | power_in | Ground reference point for the internal reference and all thresholds. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16-300mil |
| Category | LED Drivers |
| Pins | 16 |
CAD (KiCad official)
- Symbol:
UC3872DW - Footprint:
Package_SO:SOIC-16_3.9x9.9mm_P1.27mm - 3D model: SOIC-16-300mil (KiCad packages3D, STEP)
- 3D model files:
uc3872dw-etched.step/uc3872dw-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);uc3872dw.step/uc3872dw.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (12 pp, sha256
4f021ba16ffe9cab, retrieved 2026-10-08, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-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).