Texas Instruments LM3492AR111DEMO/NOPB

Overview

LM3492AR111DEMO/NOPB from Texas Instruments is a two-layer LED driver demonstration board designed to convert 12VAC from electronic transformers into regulated 360mA constant current for driving seven series-connected white LEDs (e.g., Philips Lumileds Luxeon Rebel), delivering flicker-free 7W lighting output with nominal 1MHz switching frequency.

For engineers reviewing the LM3492AR111DEMO/NOPB datasheet, LM3492AR111DEMO/NOPB application, LM3492AR111DEMO/NOPB wiring diagram, or LM3492AR111DEMO/NOPB compatible electronic transformers, this evaluation platform enables rapid validation of AR111 retrofit performance, adaptive peak current limit behavior, and compatibility across PHILIPS ET-E 50/60, OSRAM ET-PARROT, OPPLE DB35-220, and other listed AC-DC transformer sources.

Technical Context

The LM3492AR111DEMO/NOPB implements a boost converter topology with fast current regulation, using the LM3492 IC in HTSSOP-20 package to drive LEDs directly from 12VAC input without rectification or bulk DC storage. Its Adaptive Peak Current Limit circuitry dynamically adjusts peak switch current per AC half-cycle to maintain continuous input current draw and improve transformer compatibility.

It supports configurable LED string lengths (7–9 LEDs) via resistor changes (RFB2/RFB4 and RIREF), enabling output current tuning from 300mA to 360mA while maintaining >80% efficiency across 8–14VAC input range at 25°C ambient. The board uses discrete NPN transistors (CMPT3904), Schottky diodes (B360A-13-F, CMOSH-3), and passive components optimized for EMI suppression and thermal stability.

Key Specifications

Availability

LM3492AR111DEMO/NOPB is available at Aetrix Electronics and suitable for AR111 LED retrofit, commercial lighting system validation, and electronic transformer interoperability testing requiring stable component supply and traceable reference design hardware.

Supply support for LM3492AR111DEMO/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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies for industrial, automotive, and consumer applications.

The LM3492AR111DEMO/NOPB belongs to TI's LED lighting evaluation platform portfolio, developed specifically to accelerate adoption of AC-input LED drivers in retrofit lamp applications where electronic transformer compatibility and flicker-free operation are critical design requirements.

FAQ

What is the primary function of the LM3492AR111DEMO/NOPB?

The LM3492AR111DEMO/NOPB is a fully assembled evaluation board that demonstrates the LM3492 LED driver IC operating from 12VAC electronic transformer input to deliver regulated 360mA constant current to a string of seven series-connected white LEDs. It validates flicker-free performance, adaptive peak current limiting, and real-world transformer interoperability - all implemented on a compact two-layer PCB matching AR111 mechanical constraints.

Which electronic transformers has the LM3492AR111DEMO/NOPB been verified with?

The LM3492AR111DEMO/NOPB has been tested and confirmed compatible with PHILIPS ET-E 50 and ET-E 60, OSRAM ET-PARROT, ET-P60, and ET-Z60, OPPLE DB35-220 and DB602-220, NVC ET50S, and CDN CS60 under 220VAC/50Hz line conditions driving seven 20V white LEDs. Compatibility depends on transformer manufacturing variance; full qualification requires end-system validation.

Can the LM3492AR111DEMO/NOPB drive different numbers of LEDs?

Yes - the LM3492AR111DEMO/NOPB supports three configurations: original (7 LEDs at 360mA), Modification A (8 LEDs at 340mA), and Modification B (9 LEDs at 300mA). Each variant requires specific resistor changes: RFB2/RFB4 and RIREF values are documented in the AN-2192 modification table, enabling flexible string-length evaluation without board redesign.

What is the role of the Adaptive Peak Current Limit circuitry on the LM3492AR111DEMO/NOPB?

The Adaptive Peak Current Limit circuitry on the LM3492AR111DEMO/NOPB dynamically adjusts the MOSFET peak current threshold in real time based on loading and instantaneous AC input phase. This ensures continuous input current draw across each AC half-cycle, minimizing harmonic distortion and preventing transformer saturation - a key enabler for reliable operation with diverse electronic transformers.

Does the LM3492AR111DEMO/NOPB require external rectification or bulk capacitance?

No - the LM3492AR111DEMO/NOPB accepts 12VAC directly from the electronic transformer secondary without front-end rectification or large electrolytic bulk capacitors. Its boost architecture and Adaptive Peak Current Limit allow it to operate from the raw AC waveform, eliminating 100/120Hz ripple and enabling true flicker-free LED illumination without added component count or board space.