# UCC28056DBVR

**Texas Instruments** · AC-DC Controllers And Regulators · SOT-23-6

UCC28056DBVR from Texas Instruments, in a SOT-23-6. 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 | VOSNS | input | Voltage error amplifier inverting input; over-voltage protection halts switching if voltage exceeds VOvp1Rise and resumes when voltage drops below VOvp1Fall. |
| 2 | ZCD/CS | input | Zero-crossing detection and current sense input; monitors current sense resistor voltage when DRV is high and drain voltage waveform when DRV is low, enables over-current protection, valley synchronization, and second-level output over-voltage protection. |
| 3 | VCC | power_in | Positive supply voltage input; switching starts when VCC exceeds VCCStart and stops when VCC drops below VCCStop for longer than TUVLOBlk. |
| 4 | GND | power_in | Controller ground reference; connect to power stage at the lower terminal of current sense resistor RCS only. |
| 5 | DRV | bidirectional | Gate drive output with internal voltage limit VDRHigh; external resistor from DRV to GND adjusts delay between drain voltage falling and DRV rising edge for valley-synchronized turn-on. |
| 6 | COMP | bidirectional | Error amplifier output and power demand input with internal voltage limit VCOClmp, internally discharged in stop or over-voltage states, with switching control via VBSTFall and VBSTRise thresholds. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOT-23-6 |
| Category | Power Management (PMIC) |
| Pins | 6 |

## CAD (KiCad official)

- Symbol: `UCC28056DBVR`
- Footprint: `Package_TO_SOT_SMD:SOT-23-6`
- 3D model: SOT-23-6 (KiCad packages3D, STEP)
- 3D model files: `ucc28056dbvr-etched.step` / `ucc28056dbvr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ucc28056dbvr.step` / `ucc28056dbvr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/ucc28056.pdf) (55 pp, sha256 `88bddd312c898620`, retrieved 2026-10-06, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-4-5-20251001` (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/ucc28056dbvr-datasheet.pdf)