# UCC28056CDBVT

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

UCC28056CDBVT 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 | Inverting input of voltage error amplifier that monitors output voltage through external resistor divider for output overvoltage protection; oversees first level overvoltage protection threshold. |
| 2 | ZCD/CS | input | Zero-current detection and current sensing input that monitors drain voltage waveform when DRV is low and current through RCS when DRV is high; provides ZCD detection, valley synchronization, line voltage feedforward, undervoltage detection, and secondary overvoltage protection. |
| 3 | VCC | power_in | Positive power supply input ranging from 8.5V to 34V; switch operation begins when VCC exceeds VCCStart threshold and ceases when below VCCStop for longer than TUVLOBlk blanking time. |
| 4 | GND | power_in | Ground reference pin connected exclusively to the lower terminal of the current sensing resistor in the power stage. |
| 5 | DRV | output | Gate drive output for power MOSFET with internal voltage limiting to VDRHigh maximum; external resistor from pin to GND programs valley synchronization delay through TZCDR timing. |
| 6 | COMP | output | Transconductance error amplifier output for voltage loop compensation; connect RC compensation network from this pin to ground; internally discharged during stop state or when Ovp2 comparator triggers. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `UCC28056CDBVT`
- Footprint: `Package_TO_SOT_SMD:SOT-23-6`
- 3D model: SOT-23-6 (KiCad packages3D, STEP)
- 3D model files: `ucc28056cdbvt-etched.step` / `ucc28056cdbvt-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ucc28056cdbvt.step` / `ucc28056cdbvt.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/cn/lit/gpn/ucc28056) (49 pp, sha256 `c9fa6ad1b816408d`, retrieved 2026-10-07, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/ucc28056cdbvt-datasheet.pdf)