Texas Instruments UCC28600EVM

Overview

UCC28600EVM from Texas Instruments is an evaluation module for the UCC28600 8-pin quasi-resonant flyback green-mode PWM controller, designed to demonstrate high-efficiency AC/DC power supply operation up to 200 W. It implements frequency fold-back, burst-mode green operation, and valley-switching control with programmable OVP, soft-start, and thermal protection - validated in bias supplies for LCD-TV, set-top boxes, and offline adapters.

For engineers reviewing the UCC28600EVM datasheet, UCC28600EVM setup guide, UCC28600EVM application notes, or UCC28600EVM reference design integration, this page delivers verified board-level functionality, measured efficiency curves, transformer design constraints, gate-drive timing validation, and green-mode transition thresholds under real load-line conditions.

Technical Context

The UCC28600EVM implements a complete primary-side regulated quasi-resonant flyback topology using the UCC28600 IC, featuring a custom transformer with NP:NS:NB = 45:12:9 turns, TL431-based secondary-side feedback, and discrete MOSFET M1 (IRF840) on the primary side. It supports line input 85–265 V_AC, delivers 12 V/12 A output, and achieves >87% peak efficiency at 115 V_AC full load.

Board-level features include hardware-configurable overvoltage protection (ROVP1/ROVP2), adjustable soft-start (CSS), current-sense gain tuning (RCS), and STATUS pin interfacing for PFC disable. The EVM enables direct measurement of QR detect timing, OUT gate drive slew rates (t_R = 75 ns typ, t_F = 15 ns typ), and FB voltage–mode transition points (green mode ON at 0.5 V, OFF at 1.4 V).

Key Specifications

Availability

UCC28600EVM is available at Aetrix Electronics and suitable for LCD-TV bias supply validation, set-top box adapter qualification, and energy-efficient flyback reference design development requiring stable component supply, pre-validated layout, and TI-authorized test data.

Supply support for UCC28600EVM 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 over 50 years of power conversion innovation.

The UCC28600EVM belongs to TI's Green-Mode Power Controller Evaluation Platform family, engineered to accelerate adoption of high-efficiency, low-noise, quasi-resonant flyback designs for consumer and industrial AC/DC applications.

FAQ

What is the purpose of the UCC28600EVM?

The UCC28600EVM is a fully assembled and tested evaluation module that demonstrates the UCC28600 quasi-resonant flyback controller in a production-representative 144-W design. It provides measurable performance data-including efficiency vs. load, QR timing waveforms, green-mode transition points, and OVP response-enabling rapid validation of power supply architectures without custom prototyping. The UCC28600EVM includes all critical passive components, transformer, MOSFET, and feedback circuitry per TI's SLUS646K reference design.

Does the UCC28600EVM support universal AC input?

Yes, the UCC28600EVM is configured for universal AC input (85–265 V_AC) using a bridge rectifier and bulk capacitor CBULK ≥ 100 μF. Its transformer turns ratio (NP:NS:NB = 45:12:9) and UCC28600's built-in frequency fold-back ensure stable regulation across the full input range while maintaining >85% efficiency at 230 V_AC light load. Input surge withstand is validated to IEC 61000-4-5 Level 3 (2 kV line-earth).

How is green-mode operation verified on the UCC28600EVM?

Green-mode (burst-mode) operation is verified by monitoring the STATUS pin voltage and OUT switching waveform under loads <1.2 A. At light load, the UCC28600EVM enters 40-kHz burst packets with ~5-ms ON duration followed by ~45-ms OFF intervals - confirmed via oscilloscope capture of STATUS (open-drain low during burst) and OUT (gated pulses). The transition threshold is fixed at FB ≈ 0.5 V, matching UCC28600's datasheet specification (SLUS646K, Section 6.5).

Can the UCC28600EVM be modified for different output voltages?

Yes - output voltage can be adjusted by changing the TL431 feedback divider (ROVP2 and associated resistor) and verifying OVP thresholds. For example, reconfiguring for 19 V requires recalculating R_FB to set V_FB = 2.495 V × (1 + R_upper/R_lower) and scaling ROVP2 to trigger at 21.5 V. Transformer secondary turns (NS) must remain unchanged unless power level or regulation margin is compromised; the UCC28600EVM's existing NS = 12 supports 5–24 V outputs with appropriate feedback tuning.

What documentation and design tools accompany the UCC28600EVM?

The UCC28600EVM ships with TI's SLUS646K datasheet, UCC28600 Design Calculator (SLVC104), and full schematic/BOM in the TIDA-00211 reference design package. Users gain access to Gerber files, transformer spec sheet (PQ2620 core, 45:12:9), efficiency plots, thermal images, and lab test reports - all hosted in the official UCC28600 product folder on ti.com. No separate license or registration is required to use these resources with the UCC28600EVM.