Texas Instruments TPS92411DDAR

Overview

TPS92411DDAR from Texas Instruments is a 100-V floating MOSFET switch IC designed for offline AC linear LED drivers. It functions as a controlled shunt switch in conjunction with an external linear regulator to enable phase-dimmable, low-ripple LED current drive up to 70+ W. Key confirmed parameters: 100-V drain-source rating, 2-Ω typical R_DS(on), 200 µA typical quiescent current, ±4 V RSNS threshold voltage range, and 1.25 V RSET threshold voltage.

For engineers reviewing the TPS92411DDAR datasheet, TPS92411DDAR pinout, TPS92411DDAR application, or TPS92411DDAR equivalent, this page delivers verified technical context, exact pin functions, real-world dimmable LED luminaire design constraints, thermal performance data, and two validated alternative parts for linear AC/DC LED driver architectures.

Technical Context

The TPS92411DDAR implements a floating high-side switch architecture where VS serves as the internal reference (floating ground), enabling direct integration into rectified AC line stages without isolation. Its operation relies on two independent analog comparators: one monitoring RSNS voltage relative to VS to trigger switch turn-on during falling line voltage, and another monitoring RSET voltage relative to VIN to trigger switch turn-off at rising line peaks.

Unlike self-contained controllers, the TPS92411DDAR does not regulate LED current directly-it enables precise timing of current steering between LED stacks and bypass capacitors via slew-controlled transitions (0.5–1 V/µs), minimizing EMI while supporting power factors >0.9 and THD <15% in properly designed systems using discrete linear regulators or the companion TPS92410.

Key Specifications

Pinout & Package

TPS92411DDAR uses the SO PowerPAD (DDA) 8-pin package (4.89 mm × 3.90 mm) with exposed thermal pad connected to VS. This thermally enhanced package supports higher power LED luminaires (≥70 W) versus the SOT-23-5 variant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar floating MOSFET switch applications.

Compared with TPS92411PDDAR, the TPS92411DDAR offers identical switching performance and thermal capability but omits OVP-making it suitable for lower-risk, cost-optimized AC linear drivers. The NCP3065DR2G belongs to a fundamentally different topology class and cannot replace TPS92411DDAR in offline AC applications without major redesign.

Availability

TPS92411DDAR is available at Aetrix Electronics and suitable for LED lamps and light bulbs, downlights, and phase-dimmable linear drivers requiring stable component supply across industrial production cycles and global OEM programs.

Supply support for TPS92411DDAR 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 decades of expertise in lighting control ICs and energy-efficient power solutions.

The TPS92411DDAR belongs to TI's offline LED driver product line, engineered specifically for high-power-factor, low-EMI, transformerless AC linear LED lighting-targeting cost-sensitive, compact, and dimmable luminaire designs.

FAQ

What is the primary function of the TPS92411DDAR in an LED driver circuit?

The TPS92411DDAR functions as a floating 100-V MOSFET shunt switch that directs current between LED strings and storage capacitors during AC line transitions. It does not regulate current itself but enables low-ripple, high-power-factor LED operation when paired with an external linear regulator or the TPS92410. Its VS pin serves as both MOSFET source and internal reference ground, allowing direct integration into rectified AC paths without level shifters. The TPS92411DDAR relies on RSET and RSNS thresholds to time switching events precisely across the AC cycle.

Does the TPS92411DDAR include overvoltage protection (OVP)?

No, the TPS92411DDAR does not include overvoltage protection. OVP is exclusive to the TPS92411PDDAR variant, which activates at approximately 100 V (VIN–VS) to close the internal switch and protect the LED string and storage capacitor during open-circuit failures. The TPS92411DDAR has the same 100-V absolute maximum rating but lacks the OVP comparator and latch circuitry. Designs using TPS92411DDAR must ensure LED stack voltages stay within safe margins below 100 V to avoid exceeding the absolute maximum rating.

What is the role of the VS pin on the TPS92411DDAR?

The VS pin on the TPS92411DDAR serves as the floating ground reference for the entire device: it is the source terminal of the internal MOSFET, the reference point for all voltage measurements (VIN, RSET, RSNS, DRAIN), and the connection point for the exposed thermal pad. Unlike conventional ground pins, VS is not tied to system ground-it floats with the LED string cathode or intermediate node in multi-stack configurations. Proper low-inductance routing of VS to PCB copper and thermal pad is essential for stable switching, accurate sensing, and thermal performance in the TPS92411DDAR.

Can the TPS92411DDAR be used in 230 VAC applications?

Yes, the TPS92411DDAR is qualified for 230 VAC applications when implemented with appropriate design margins. In a typical 230 VAC phase-dimmable system, the peak rectified voltage reaches ~325 V, so multiple TPS92411DDAR devices are cascaded across series LED strings (e.g., 40 V / 80 V / 160 V) to distribute voltage stress. Each device operates within its 100-V rating, with RSET and RSNS thresholds set to coordinate switching order. Design tools SLVC517 (for discrete regulators) or SLVC580 (with TPS92410) provide validated component values for 230 VAC use cases with the TPS92411DDAR.

How does the TPS92411DDAR achieve low EMI in dimmable LED drivers?

The TPS92411DDAR achieves low EMI through slew-controlled, low-frequency switching: its dv/dt(ON) is limited to 1 V/µs and dv/dt(OFF) to 0.5 V/µs, preventing fast edge-induced radiation. Because it switches only near AC zero-crossings-and not at high frequencies like PWM controllers-it generates negligible high-frequency harmonics. This eliminates the need for EMI filters typically required with switch-mode drivers, simplifying compliance with EN 55015 and FCC Part 15. The absence of inductors and transformers further reduces magnetic emissions, making the TPS92411DDAR ideal for compact, filter-free dimmable LED lamps.