Texas Instruments TPS92511DDAR

Overview

TPS92511DDAR from Texas Instruments is a 65-V, 500-mA common-anode constant-current buck LED driver IC with integrated low-side N-channel MOSFET, no external current-sense resistor, and programmable switching frequency (50–500 kHz). It delivers ±3.6% LED current accuracy and supports PWM dimming with >1000:1 contrast ratio in architectural lighting and MR-16 LED lamp applications.

For engineers reviewing the TPS92511DDAR datasheet, TPS92511DDAR pinout, TPS92511DDAR application, or TPS92511DDAR equivalent, key selection considerations include its floating-buck topology enabling common-anode multi-string wiring, thermal foldback support via analog dimming, and single-layer PCB feasibility with only five external components.

Technical Context

The TPS92511DDAR employs a proprietary Pulse-Level-Modulation (PLM) control scheme operating in continuous conduction mode (CCM), regulating average LED current by sensing inductor current only during the MOSFET on-time-not across the full switching cycle. This eliminates need for external loop compensation and reduces sensing power dissipation.

Its floating buck architecture uses an integrated low-side N-MOSFET (R_DS(on) = 1.4 Ω typ) with no boot capacitor requirement, enabling operation under high VIN/V_LED ratios and drop-out conditions. The device supports both PWM dimming (6 µs min pulse width at 500 kHz) and analog dimming via IADJ pin current injection.

Key Specifications

Pinout & Package

TPS92511DDAR is housed in a Power Enhanced SOIC-8 package (HSOP-8) with exposed thermal pad (4.89 mm × 3.90 mm), optimized for thermal dissipation in high-power LED driver applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar constant-current buck LED driver applications.

Compared with LM3409HVMM/NOPB and MPQ4425AGU-AEC1-P, the TPS92511DDAR offers superior design simplicity (no sense resistor or compensation), tighter current accuracy, and native thermal foldback-making it optimal for commercial architectural and retrofit LED systems prioritizing manufacturability and dimming fidelity.

Availability

TPS92511DDAR is available at Aetrix Electronics and suitable for architectural lighting, office troffer, and MR-16 LED lamp applications requiring stable component supply, long-term production continuity, and consistent parametric performance across manufacturing lots.

Supply support for TPS92511DDAR 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 LED driver innovation and high-reliability industrial IC design.

The TPS92511DDAR belongs to TI's high-voltage LED driver product line, engineered specifically for cost-sensitive, high-efficiency constant-current lighting applications where simplified bill-of-materials and common-anode scalability are critical system requirements.

FAQ

What is the maximum input voltage the TPS92511DDAR can handle continuously?

The TPS92511DDAR has a recommended operating input voltage range of 4.5 V to 65 V. Its absolute maximum rating is 67 V for transient conditions (≤2 ns), but continuous operation above 65 V requires external high-voltage circuitry such as a series N-MOSFET stage as documented in Figure 19 of the datasheet. Operating beyond 65 V without modification risks permanent damage to the TPS92511DDAR.

Does the TPS92511DDAR require an external current-sense resistor?

No, the TPS92511DDAR does not require an external current-sense resistor. It uses a proprietary Pulse-Level-Modulation (PLM) control scheme that regulates LED current by sensing inductor current only during the MOSFET on-time. This eliminates power loss, board space, and tolerance-related inaccuracies associated with shunt resistors-confirmed in the "Features" section and Section 7.3.1 of the datasheet.

How is LED current programmed on the TPS92511DDAR?

LED current on the TPS92511DDAR is programmed using a single external resistor (RIADJ) connected between the IADJ pin and GND. The IADJ pin is internally biased to 1.25 V, so ILED ≈ 1.25 V / RIADJ. For example, a 3.01 kΩ resistor sets ILED to approximately 415 mA. The datasheet specifies minimum RIADJ = 1.25 kΩ (max ILED = 1 A limit not reached due to MOSFET current limit) and maximum RIADJ = 30 kΩ (min ILED = 42 mA).

Can the TPS92511DDAR support thermal foldback protection?

Yes, the TPS92511DDAR supports thermal foldback through its analog dimming capability. By injecting current into the IADJ pin-e.g., using an NTC thermistor in a bias network-the device reduces programmed LED current as temperature rises. This is explicitly detailed in Section 7.3.13 ("Thermal Foldback") and Figure 20 of the datasheet, enabling automatic LED derating to prevent thermal runaway.

What package type is used for the TPS92511DDAR and why is it important?

The TPS92511DDAR uses the HSOP-8 (Power Enhanced SOIC-8) package with an exposed thermal pad (4.89 mm × 3.90 mm). This package provides low junction-to-board thermal resistance (R_θJB = 30.6 °C/W) and integrates a copper thermal pad directly soldered to PCB ground planes-critical for dissipating heat generated by the integrated 1.4 Ω MOSFET during 500 mA operation and maintaining reliability in enclosed LED fixtures.