Texas Instruments TPS92070EVM-682

Overview

TPS92070EVM-682 from Texas Instruments is an evaluation module designed to demonstrate the TPS92070 dimmable quasi-resonant LED lighting controller in a low-power isolated flyback topology. It delivers 370 mA at 16 V to five on-board white LEDs from a 90–130 VAC, 60 Hz input and supports leading-edge TRIAC dimming with exponential light-output control and valley-fill power factor correction.

For engineers reviewing the TPS92070EVM-682 datasheet, TPS92070EVM-682 test setup, TPS92070EVM-682 application circuit, or TPS92070EVM-682 alternative evaluation boards, this module provides validated reference design data for AC-input LED driver development-including line regulation, dimmer compatibility, efficiency (82% typ), power factor (0.80 min), and safety-critical high-voltage layout practices.

Technical Context

The TPS92070EVM-682 implements a valley-switching discontinuous conduction mode (DCM) flyback converter using the TPS92070PW controller in TSSOP-16 packaging. It integrates dimmer detection (TDD pin), dimmer trigger control (DTC), valley detect (VD), and LED current sense (SEN/CS) interfaces to enable seamless TRIAC dimmer interoperability without external phase-detection circuitry.

Its architecture includes a 400-V primary-side MOSFET (STD7NK40ZT), valley-fill PFC stage, and isolated secondary-side feedback via optocoupler-less sensing. The board operates with cycle-by-cycle current limiting, programmable minimum LED current (13 mA), and thermal-aware component placement-validated for 25°C ambient operation with no forced airflow required.

Key Specifications

Availability

TPS92070EVM-682 is available at Aetrix Electronics and suitable for LED bulb replacement, downlight development, wall washer prototyping, and other low-power AC-input LED driver applications requiring stable component supply, reference design validation, and dimmer interoperability testing.

Supply support for TPS92070EVM-682 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 specializing in analog, embedded processing, and power management technologies, with over 90 years of innovation in industrial, automotive, and consumer electronics.

The TPS92070EVM-682 belongs to TI's LED lighting evaluation platform family, engineered specifically to accelerate adoption of dimmable, high-PF, offline LED drivers for residential and commercial retrofit lighting applications.

FAQ

What is the primary function of the TPS92070EVM-682?

The TPS92070EVM-682 is an evaluation module that demonstrates the TPS92070 dimmable LED driver controller in a complete, tested 6-W isolated flyback design. It provides 370 mA constant current to five onboard LEDs from 90–130 VAC input and validates TRIAC dimmer compatibility, power factor correction, and thermal behavior-enabling rapid system-level verification before custom PCB design. The TPS92070EVM-682 is not a production-ready product but a lab-grade development tool.

Does the TPS92070EVM-682 support both dimmed and non-dimmed operation?

Yes, the TPS92070EVM-682 supports both modes. With no dimmer connected, it operates in high-PF valley-fill mode (PF ≥0.80) and delivers full 370 mA LED current. When a leading-edge TRIAC dimmer is inserted, the TPS92070 detects dimmer presence via the TDD signal and disables valley-fill PFC while enabling exponential dimming control-allowing smooth lumen reduction from 100% down to <10% conduction angle. The TPS92070EVM-682 user guide documents both configurations with test waveforms and efficiency curves.

What safety precautions apply when using the TPS92070EVM-682?

The TPS92070EVM-682 is a high-voltage evaluation module with accessible 130-VAC inputs and primary-side nodes exceeding 400 V. TI mandates qualified personnel only, use of insulated tools and differential probes, EPO-protected power strips, physical barriers during energized operation, and personal protective equipment including safety glasses and latex gloves. The TPS92070EVM-682 must never be used in production, left unattended while powered, or operated outside its 90–130 VAC input range-per TI's SLUU698 User's Guide warnings.

Can the TPS92070EVM-682 drive external LED loads?

Yes, the TPS92070EVM-682 supports external LED loads via J2 header pins: connect +LED (J2 pin 1) and LED RTN (J2 pin 3) to an external string rated for 370 mA and ~16 V total forward voltage. The onboard five-Cree-MX-LED array serves as the default load, but the board's current regulation loop and feedback network remain fully functional with external loads-provided they meet the same electrical and thermal constraints. The TPS92070EVM-682 schematic (Figure 1) shows all interface points and compensation components.

What are the key test points on the TPS92070EVM-682 and their purposes?

The TPS92070EVM-682 includes 20 labeled test points (TP1–TP20) for probing critical signals: TP1 (LED+) and TP15 (LED RTN) measure output voltage; TP11 (Q3 source) accesses primary current sense; TP3 (TDD) indicates dimmer detection status; TP6 (DTC) monitors dimmer trigger control; TP13 (VD) captures valley detect timing; and TP17 (SEN) provides dimmer sense input. All require differential probes per TI's recommendation to avoid noise injection and flickering-documented in Table 2 of the SLUU698 User's Guide. The TPS92070EVM-682 layout separates power ground (PGND) and signal ground (GND) to maintain measurement integrity.