Texas Instruments TPS92550EVM/NOPB

Overview

TPS92550EVM/NOPB from Texas Instruments is an evaluation board for the TPS92550 450mA, 36V constant-current buck LED driver micro-module. It delivers up to 14W into a single LED string of up to 10 LEDs, integrates the power inductor, operates at 400kHz switching frequency, and supports 256-step PWM dimming at 240Hz for general lighting applications.

For engineers reviewing the TPS92550EVM/NOPB datasheet, TPS92550EVM/NOPB pinout, TPS92550EVM/NOPB application, or TPS92550EVM/NOPB equivalent, this board enables rapid validation of LED current accuracy (±1% typical), EN55015-compliant EMI performance, thermal shutdown protection, and adjustable LED current (300–450mA) via external resistors RIADJ and RVREF.

Technical Context

The TPS92550EVM/NOPB implements a complete reference design for the TPS92550 micro-module, which integrates MOSFETs, gate drivers, compensation network, and shielded power inductor in a PFM-7 package. It accepts 4.5V–36V input and regulates LED current with ±1% accuracy over line, load, and temperature.

Board-level features include dual-layer 2oz copper PCB layout optimized for low EMI, COUT capacitor critical for EN55015 radiated emissions compliance, and configurable ILED setting via two solder pads (RIADJ and RVREF) supporting 300mA, 350mA, or 450mA default configurations.

Key Specifications

Availability

TPS92550EVM/NOPB is available at Aetrix Electronics and suitable for LED lighting development, power electronics prototyping, and EMI-compliance verification requiring stable component supply and TI-validated reference designs.

Supply support for TPS92550EVM/NOPB 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 delivering analog and embedded processing solutions, with leadership in power management, signal chain, and high-reliability ICs.

The TPS92550EVM/NOPB belongs to TI's LED lighting evaluation platform family, designed to accelerate adoption of integrated LED driver micro-modules in commercial and industrial solid-state lighting applications.

FAQ

What is the primary function of the TPS92550EVM/NOPB?

The TPS92550EVM/NOPB is an evaluation board for the TPS92550 LED driver micro-module. It provides a ready-to-use platform to validate constant-current LED driving performance, including current accuracy, thermal behavior, EMI compliance, and PWM dimming functionality - all without requiring custom PCB design. The TPS92550EVM/NOPB directly interfaces with high-power LED strings and accepts standard 4.5–36V DC input.

Does the TPS92550EVM/NOPB require external components to operate at default settings?

No. The TPS92550EVM/NOPB ships configured for 350mA LED current by default (RIADJ = 0Ω, RVREF open), with all critical components-including CIN and COUT (2.2µF/100V X7R ceramics), power inductor, and feedback network-pre-installed. Only VIN, GND, LED+/-, and optional DIM signal connections are needed to begin testing. The TPS92550EVM/NOPB requires no additional passive components for baseline operation.

How is LED current adjusted on the TPS92550EVM/NOPB?

LED current on the TPS92550EVM/NOPB is adjusted by populating resistor pads RIADJ and/or RVREF with specific values listed in Tables 1–3 and Figures 1–2. For example, 300mA uses 499Ω at RIADJ (RVREF open), 350mA uses 0Ω at RIADJ (RVREF open), and 450mA uses 0Ω at RIADJ plus 10.5kΩ at RVREF. These resistors set the internal current-sense reference and enable precise 300–450mA tuning without modifying the TPS92550EVM/NOPB PCB layout.

What EMI standards does the TPS92550EVM/NOPB meet, and how is compliance achieved?

The TPS92550EVM/NOPB meets EN55015 radiated emissions limits, as verified in Figures 30–37 of the user's guide. Compliance relies on the exact 2.2µF COUT capacitor placement adjacent to the micro-module, strict adherence to the 2-layer 2oz copper layout (Figures 38–40), and proper grounding of the EP pad. Removing or relocating COUT degrades EMI performance - the TPS92550EVM/NOPB's layout is optimized end-to-end for regulatory pass.

Can the TPS92550EVM/NOPB drive multiple LED strings?

No. The TPS92550EVM/NOPB is designed exclusively for single-string LED operation, consistent with the TPS92550 micro-module's architecture. It supports up to 10 series-connected LEDs (max ~36V forward voltage) but does not provide parallel string control, independent current regulation, or multi-channel outputs. Driving multiple independent strings requires separate TPS92550EVM/NOPB units or alternative multi-channel drivers.