Texas Instruments UCC28810D

Overview

UCC28810D from Texas Instruments is a transition-mode LED lighting power controller for single-stage, triac-dimmable AC-input PFC flyback converters. It delivers 750-mA regulated LED current at 25 W, features 15.8-V UVLO turn-on threshold, ±750-mA peak gate drive, and internal 2.50-V reference with ±50-mV tolerance over –40°C to 105°C. Used in commercial retrofit luminaires requiring high PF and EMC compliance.

For engineers reviewing the UCC28810D datasheet, UCC28810D pinout, UCC28810D application, or UCC28810D equivalent, key selection considerations include its critical conduction mode operation, TZE-based zero-current switching, slew-rate-enhanced transconductance amplifier (90 µS typ), and SOIC-8 package compatibility with standard PCB layouts for LED driver designs.

Technical Context

The UCC28810D implements critical conduction mode (CrCM) control using transformer zero-energy detection (TZE pin) to trigger MOSFET turn-on at valley points, minimizing switching losses and EMI. Its transconductance error amplifier (gM = 90 µS typ) drives a current reference generator that shapes input current to track the rectified AC line via VINS sensing.

It integrates overvoltage protection (OVP threshold = VREF + 0.190 V), enable/disable functionality via VSENSE < 0.67 V, and a restart timer (200–400 µs) for fault recovery. The 1.3-mA typical EAOUT source current enables fast start-up and improved transient response during low-output conditions.

Key Specifications

Pinout & Package

UCC28810D is housed in an 8-pin SOIC (D) package with standard 1.27-mm pitch, surface-mount footprint, and thermal impedance of 150°C/W (junction-to-ambient).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED lighting controller applications.

Compared with UCC28811D and ICE2PCS01G, the UCC28810D uniquely combines triac-dimming readiness, valley-switching CrCM operation, and fast-transient error amplifier response-making it optimal for cost-sensitive, single-stage, dimmable LED retrofit applications where layout simplicity and thermal efficiency are prioritized.

Availability

UCC28810D is available at Aetrix Electronics and suitable for commercial lighting retrofits, residential dimmable fixtures, and industrial area lighting requiring stable component supply and long-term production continuity.

Supply support for UCC28810D includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in energy-efficient power conversion ICs.

The UCC28810D belongs to TI's LED lighting power controller product line, engineered specifically for cost-effective, single-stage, triac-dimmable AC/DC LED drivers targeting residential and commercial retrofit markets.

FAQ

What is the primary operating mode of the UCC28810D?

The UCC28810D operates in critical conduction mode (CrCM), also known as boundary conduction mode. It uses the TZE pin to detect transformer zero-energy points and triggers MOSFET turn-on at valley crossings, achieving high efficiency and low EMI without requiring external frequency programming. This self-oscillating behavior is intrinsic to the UCC28810D architecture and eliminates the need for timing capacitors or external oscillators.

How does the UCC28810D support triac dimming compatibility?

The UCC28810D supports triac dimming through its ability to maintain stable operation during phase-cut AC waveforms, enabled by fast transient response from its slew-rate-enhanced error amplifier and zero-power detect function. In dimmed conditions, the UCC28810D sustains regulation by dynamically adjusting switching frequency and peak current to match the reduced RMS input voltage-without requiring additional dimming interface circuitry.

What is the purpose of the 75-mV offset on the ISENSE pin of the UCC28810D?

The 75-mV internal offset on the ISENSE pin of the UCC28810D compensates for zero-crossing distortion in the input current waveform, improving total harmonic distortion (THD) performance. This offset ensures accurate current sensing near the AC line zero-crossing point, where noise and parasitic effects are most pronounced, thereby enhancing power factor correction across the full input voltage range.

Can the UCC28810D be used in boost or buck topologies, or is it limited to flyback?

Yes, the UCC28810D supports flyback, buck, and boost converter topologies-all operating in critical conduction mode. Its current-sense comparator, TZE input, and gate driver architecture are topology-agnostic; external component selection (e.g., transformer vs. inductor, diode placement) determines the implementation. Reference designs confirm functional validation in all three configurations, with flyback being most common for isolated LED drivers.

What protection features are integrated into the UCC28810D?

The UCC28810D integrates overvoltage protection (OVP), open-feedback protection, enable/disable functionality via VSENSE, overcurrent limiting via ISENSE threshold, and a restart timer. Its zero-power detect circuit shuts down GDRV at light loads to prevent output overvoltage, while the slew-rate enhancement circuit acts as a first-response transient limiter before OVP triggers-providing layered, robust system protection without external components.