Texas Instruments UCC28810DRG4

Overview

UCC28810DRG4 from Texas Instruments is a transition-mode LED lighting power controller for single-stage, power-factor-corrected AC/DC flyback, buck, or boost converters. It delivers 750-mA regulated LED current from 85–305 VAC input, features 15.8-V UVLO turn-on threshold, ±750-mA peak gate drive, and integrated zero-energy detection for valley switching. It targets triac-dimmable commercial/residential retrofit luminaires.

For engineers reviewing the UCC28810DRG4 datasheet, UCC28810DRG4 pinout, UCC28810DRG4 application, or UCC28810DRG4 equivalent, key selection criteria include critical conduction mode (CrCM) operation, internal 2.5-V reference accuracy (±2%), slew-rate-enhanced transconductance amplifier (90 µS typ), and compatibility with traditional wall dimmers in HB LED lighting systems.

Technical Context

The UCC28810DRG4 implements self-oscillating critical conduction mode control: turn-on is triggered by transformer zero-energy detection (TZE pin, 1.25-V rising threshold), while turn-off is governed by current-sense comparator (ISENSE, 1.7-V max threshold). Its transconductance error amplifier (gM = 90 µS) drives a current reference generator that shapes input current to track line voltage via VINS and EAOUT inputs.

Integrated protection includes overvoltage protection (OVP activation at VSENSE > 2.69 V), open-feedback shutdown, enable circuit (0.67-V threshold), and restart timer (200–400 µs delay). The device operates across –40°C to 105°C and uses an internal 7.5-V rail to bias all functional blocks, including UVLO, OVP, and zero-power detection comparators.

Key Specifications

Pinout & Package

UCC28810DRG4 is housed in an 8-pin SOIC (D) package with standard JEDEC MS-012AC footprint (5.3 mm × 6.2 mm, 1.75 mm height). Thermal impedance is 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 UCC28811DR and NCP1653ADR2G, the UCC28810DRG4 uniquely integrates triac-compatible dimming, valley switching, and single-stage PFC in one SOIC-8 package-enabling compact, flicker-free, high-PF LED drivers without auxiliary timing or sensing components.

Availability

UCC28810DRG4 is available at Aetrix Electronics and suitable for commercial retrofit luminaires, residential dimmable fixtures, and industrial area lighting requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for UCC28810DRG4 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 delivering analog and embedded processing solutions, with over 50 years of power management innovation and broad manufacturing scale.

The UCC28810DRG4 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 UCC28810DRG4?

The UCC28810DRG4 operates in critical conduction mode (CrCM), also known as transition mode. It uses self-oscillating control where turn-on is triggered by transformer zero-energy detection (TZE pin) and turn-off is determined by the current-sense comparator (ISENSE pin). This mode enables high efficiency, low EMI, and inherent power factor correction without requiring a clock oscillator or complex control loop design. The UCC28810DRG4 does not support continuous conduction mode (CCM) or discontinuous conduction mode (DCM) operation.

How does the UCC28810DRG4 support triac dimming functionality?

The UCC28810DRG4 supports triac dimming through its native compatibility with leading-edge phase-cut waveforms. It interprets dimmer conduction angle changes via the VINS pin, which senses rectified line voltage, and dynamically adjusts the current reference generator output to maintain constant LED current across the dimming range. No external dimmer interface IC or additional timing circuitry is required. The UCC28810DRG4 maintains stable operation down to 5% brightness without flicker or pop-on artifacts, as verified in TI reference design TIDA-00122.

What protection features are integrated into the UCC28810DRG4?

The UCC28810DRG4 integrates six core protections: overvoltage protection (OVP) triggered at VSENSE > 2.69 V, open-feedback disable (pulling VSENSE low shuts down GDRV), undervoltage lockout (UVLO with 15.8-V turn-on and 9.7-V turn-off), zero-power detect (shuts down at light load to prevent overvoltage), restart timer (200–400 µs delay after fault), and peak current limiting via ISENSE comparator. All functions are implemented internally-no external comparators, latches, or timers are needed for basic protection compliance.

Can the UCC28810DRG4 be used in boost or buck topologies, or is it limited to flyback?

Yes, the UCC28810DRG4 supports flyback, buck, and boost converter topologies in critical conduction mode. Its current-sense comparator, TZE input, and gate driver architecture are topology-agnostic. For buck or boost implementations, the TZE pin must be repurposed or left unused (with appropriate external pull-down), and the current-sense resistor is placed in the main switch path. TI application note SLUA527 provides validated schematics and layout guidelines for all three configurations using the UCC28810DRG4.

What is the role of the 75-mV offset in the ISENSE path of the UCC28810DRG4?

The 75-mV offset added to the ISENSE signal compensates for zero-crossing distortion caused by transformer magnetizing current and diode forward-voltage variation. By raising the effective current-sense threshold near the AC line zero-crossing, the UCC28810DRG4 ensures consistent switch turn-off timing across the entire half-cycle, reducing harmonic content and improving total harmonic distortion (THD) performance to <20% at full load. This offset is fixed and internal-no external adjustment is possible or required.