Texas Instruments UCC28700EVM-068

Overview

UCC28700EVM-068 from Texas Instruments is a 5-W isolated AC/DC evaluation module designed for USB adapter development. It accepts universal 100–240 V_RMS input and delivers a regulated 5 V_DC output at up to 1 A, featuring flyback topology with UCC28700 PWM controller, 74–76% full-load efficiency, and integrated safety test points (TP1–TP4) for lab validation.

For engineers reviewing the UCC28700EVM-068 datasheet, UCC28700EVM-068 test setup, UCC28700EVM-068 application as a USB adapter reference design, or UCC28700EVM-068 alternative evaluation boards, this module provides verified off-line flyback performance, high-voltage safety interface guidance, and TI's documented 5-W USB power conversion architecture under real-world line/load transients.

Technical Context

The UCC28700EVM-068 implements a primary-side regulated flyback converter using the UCC28700DBV controller IC, eliminating optocoupler feedback. It operates at a fixed 107 kHz switching frequency and supports universal AC input via bridge rectification and bulk capacitance (C2/C3 = 560 µF).

Output regulation maintains ±3% line and load regulation over 100–240 V_RMS input and 0–1 A output, with output overvoltage protection set at 5.75 V and 100 mV_pp ripple at full load. The board includes Kelvin test points (TP1–TP4) for accurate AC/DC voltage and current measurement during efficiency and transient characterization.

Key Specifications

Availability

UCC28700EVM-068 is available at Aetrix Electronics and suitable for USB adapter prototyping, offline flyback topology validation, and energy-efficient AC/DC reference design development requiring stable component supply and documented TI evaluation hardware.

Supply support for UCC28700EVM-068 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies with over 90 years of innovation in industrial, automotive, and consumer electronics.

The UCC28700EVM-068 belongs to TI's High-Voltage Evaluation Module (HV EVM) product line, engineered specifically for safe, lab-based validation of off-line AC/DC converters targeting USB, IoT, and low-power industrial power supplies.

FAQ

What is the primary function of the UCC28700EVM-068?

The UCC28700EVM-068 is a 5-W isolated AC/DC evaluation module built around the UCC28700 flyback PWM controller. Its primary function is to demonstrate and validate a primary-side regulated, universal-input (100–240 V_RMS) USB adapter design delivering 5 V/1 A. It is not a production-ready product but a lab tool for topology verification, efficiency testing, and safety-compliant measurement setup per TI's HV EVM guidelines.

Does the UCC28700EVM-068 include safety certifications for end-product use?

No - the UCC28700EVM-068 is explicitly designated for laboratory evaluation only and carries no end-product safety certifications (e.g., UL, CE, CB). TI states it is "not intended to be an end product" and prohibits its use in production systems. All high-voltage test points remain exposed, and the board lacks enclosure, creepage/clearance compliance documentation, or EMC filtering required for certified power supplies. Engineers must redesign and requalify any derivative for commercial deployment.

What are the critical safety precautions when operating the UCC28700EVM-068?

TI mandates strict safety protocols: only qualified professionals may operate the UCC28700EVM-068 in a lab with Emergency Power Off (EPO)-protected power strips, insulated tools, and non-conductive work surfaces. Energized circuits exceed 50 V_RMS; users must de-energize before probing, use Kelvin test points (TP1–TP4), wear safety glasses and latex gloves, and maintain physical barriers during operation. Untrained personnel must not handle the module - failure risks electrical shock, burns, or death.

Can the UCC28700EVM-068 be modified for different output voltages or power levels?

While the UCC28700EVM-068 schematic and bill of materials are publicly documented, TI does not support or validate modifications. Changing output voltage requires recalculating feedback resistors (R9, R11), transformer turns ratio (T1), output capacitor ratings (C4/C5), and OVP threshold components - all affecting safety isolation, regulation accuracy, and efficiency. Any modification voids TI's 90-day warranty and violates the EVM's intended-use terms; redesign must undergo full safety and EMC requalification.

What measurement equipment is required to characterize the UCC28700EVM-068?

Per TI's SLUU968A User's Guide, valid characterization requires: (1) an isolated AC source (0–265 V_RMS); (2) a precision shunt resistor + power analyzer capable of measuring 1 mW–10 W input power; (3) a 4-channel, 100 MHz oscilloscope with 600-V-rated probes; (4) a digital voltmeter; and (5) a resistive or electronic load rated for 5 W at 5 V. Test points TP1–TP4 enable Kelvin connections to eliminate lead resistance errors in voltage/current measurements on the UCC28700EVM-068.