Texas Instruments TPS92411DDA

Overview

TPS92411DDA from Texas Instruments is a 100-V floating MOSFET switch for offline AC linear LED drivers, functioning as a controlled shunt switch in conjunction with an external linear regulator to achieve >0.9 power factor, <10% current ripple, and phase-dimmable operation up to 70 W. It integrates slew-controlled switching to minimize EMI and operates across 7.5–100 V input range with 200 µA quiescent current.

For engineers reviewing the TPS92411DDA datasheet, TPS92411DDA pinout, TPS92411DDA application, or TPS92411DDA equivalent, key selection criteria include its SO PowerPAD-8 package thermal performance (θJA = 58.6°C/W), RSET/RSNS threshold programming interface, VIN undervoltage lockout (6.5 V), and compatibility with discrete or TPS92410-based linear regulator topologies for 120/230 VAC systems.

Technical Context

The TPS92411DDA implements a floating high-side switch architecture where DRAIN connects to rectified AC line and VS serves as the floating source/reference node. Its operation relies on two externally set thresholds: RSET pin voltage (1.25 V typ) triggers switch turn-off to route current through LEDs; RSNS pin current (–4 µA typ) triggers switch turn-on to bypass LEDs and discharge storage capacitors.

Unlike self-contained LED drivers, the TPS92411DDA does not regulate output current directly-it enables low-ripple, high-PF linear regulation by precisely timing shunt conduction during AC zero-cross transitions. Its 100-V RDS(on) rating (1–2.5 Ω) and slew-controlled dv/dt (0.5–1 V/µs) ensure robust operation without inductive components while maintaining EMI compliance in compact luminaires.

Key Specifications

Pinout & Package

TPS92411DDA uses the SO PowerPAD (8-pin) package with exposed thermal pad connected to VS. This package provides 4.89 mm × 3.90 mm footprint and 58.6°C/W junction-to-ambient thermal resistance for high-power LED driver designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS92411DDA, TPS92411DBVR trades thermal capability for miniaturization, while TPS92411PDDA adds fault protection at the expense of design simplicity-making TPS92411DDA the optimal balance of power handling, layout flexibility, and cost for 30–70 W phase-dimmable luminaires.

Availability

TPS92411DDA is available at Aetrix Electronics and suitable for LED luminaires, phase-dimmable retrofit lamps, and commercial downlights requiring stable component supply with long lifecycle support.

Supply support for TPS92411DDA 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 and embedded processing technologies, with decades of expertise in power management and lighting control ICs.

The TPS92411 product line delivers floating high-voltage switches for AC-linear LED drivers-designed specifically to replace inductive flyback/buck solutions in cost-sensitive, space-constrained, and EMI-sensitive lighting applications.

FAQ

What is the primary function of the TPS92411DDA in an LED driver circuit?

The TPS92411DDA acts as a floating high-side shunt switch that routes current away from LED strings during AC line valleys, enabling low-ripple linear regulation without inductors. It does not regulate current directly but coordinates with an external linear regulator-using RSET and RSNS thresholds-to sequence conduction across stacked LEDs. This architecture achieves >0.9 power factor and <10% current ripple in 120/230 VAC phase-dimmable systems. The TPS92411DDA itself handles up to 100 V and dissipates heat via its SO PowerPAD thermal pad.

How does the TPS92411DDA differ from the TPS92411PDDA variant?

The TPS92411DDA lacks overvoltage protection (OVP), while the TPS92411PDDA includes OVP that triggers switch closure when VIN–VS exceeds ~100 V. Both share identical SO PowerPAD-8 packaging, pinout, RSET/RSNS thresholds, and thermal specs. The TPS92411DDA is intended for LED stacks ≤94 V where absolute maximum ratings provide sufficient margin; the TPS92411PDDA is required for higher-voltage stacks or safety-critical installations where open-circuit LED failure could exceed 105 V absolute max. No PCB changes are needed when upgrading from TPS92411DDA to TPS92411PDDA.

Can the TPS92411DDA be used with a discrete linear regulator instead of the TPS92410?

Yes-the TPS92411DDA is explicitly designed to work with either the TPS92410 controller or a discrete linear regulator (e.g., MOSFET + op-amp + sense resistor). In discrete configurations, the TPS92411DDA's RSET and RSNS pins interface with the regulator's output to control shunt timing. TI provides design calculators SLVC516 (120 VAC) and SLVC517 (230 VAC) to size RSNS/RSET resistors and storage capacitors for target ripple and power factor. The TPS92411DDA's 200 µA IQ and slew-controlled switching ensure compatibility with both architectures.

What thermal design considerations apply to the TPS92411DDA's SO PowerPAD package?

The TPS92411DDA's SO PowerPAD package requires the exposed thermal pad to be soldered directly to a VS-connected copper pour for effective heat transfer. TI specifies θJA = 58.6°C/W on JEDEC-standard high-K board; actual performance depends on PCB copper area, layer count, and thermal vias under the pad. For 70 W operation, ≥4 cm² of 2-oz copper connected via ≥6 thermal vias (0.3 mm diameter) is recommended. Pins 2, 6, and 7 are N/C and must remain unconnected to prevent parasitic coupling that degrades thermal measurement accuracy.

Why does the TPS92411DDA use separate RSET and RSNS pins instead of a single control input?

The dual-threshold architecture (RSET for turn-off, RSNS for turn-on) enables precise hysteresis control essential for stable operation across AC line cycles. RSET sets the rising-voltage threshold at which the switch opens to route current to LEDs and charge storage capacitors; RSNS sets the falling-voltage threshold at which the switch closes to bypass LEDs and discharge capacitors. This separation allows independent optimization of conduction timing for multi-string stacks-e.g., sequencing bottom/middle/top LED strings at different voltages-and prevents oscillation near threshold crossings. The TPS92411DDA's –4 µA RSNS current and 1.25 V RSET voltage are trimmed for ±1% matching across temperature.