Texas Instruments TLC5952DAPR

Overview

TLC5952DAPR from Texas Instruments is a 24-channel constant-current LED sink driver with three independent 7-bit global brightness control groups (R/G/B), ±1% channel-to-channel current matching, 35 mA max per red/green channel and 26.2 mA per blue channel, and integrated open/short LED fault detection. It targets full-color LED displays requiring precise per-group dimming and daisy-chain serial control.

For engineers reviewing the TLC5952DAPR datasheet, TLC5952DAPR pinout, TLC5952DAPR application, or TLC5952DAPR equivalent, this page delivers verified electrical specs, HTSSOP-32 package layout, real-world use cases in signage and stage lighting, and two validated alternative drivers with documented functional trade-offs.

Technical Context

The TLC5952DAPR implements a 25-bit serial shift register with separate latch (LAT) and blanking (BLANK) controls, enabling synchronized update of 24-channel on/off states and three 7-bit brightness registers. Its internal current-setting architecture uses a single external resistor (RIREF) to define maximum output current for each color group independently.

Error detection includes programmable LED open-load thresholds (0.25–1.3 V) and short-circuit detection referenced to VCC (0.55×–0.95×), all readable via the same serial interface. Thermal shutdown activates at 150°C with 5–20°C hysteresis and auto-restart recovery.

Key Specifications

Pinout & Package

Package: HTSSOP-32 (DAP) with exposed thermal pad (11.00 mm × 6.20 mm); optimized for high-power LED driving with low thermal resistance (R_θJA = 28.3°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED driver applications.

Compared with TLC5952DAPR, TLC5947RTQT offers higher PWM resolution but sacrifices fault detection and thermal protection, while IS31FL3731-QFLS4-TR simplifies system design with I²C but removes daisy-chain scalability and robustness features critical for large displays.

Availability

TLC5952DAPR is available at Aetrix Electronics and suitable for full-color LED video walls, outdoor signboards, and professional stage lighting requiring stable component supply, long-term production continuity, and guaranteed thermal performance across industrial temperature ranges.

Supply support for TLC5952DAPR 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 precision power management and signal chain solutions.

The TLC5952DAPR belongs to TI's high-performance LED driver product line, engineered specifically for demanding RGB display applications requiring simultaneous multi-channel current regulation, fault resilience, and scalable serial control.

FAQ

What is the maximum LED supply voltage supported by the TLC5952DAPR?

The TLC5952DAPR supports up to 15 V on its OUTR0–OUTB7 pins. This allows direct driving of LED strings with 3–5 LEDs in series (depending on V_f) without requiring external boost converters. The 15 V rating is absolute maximum; recommended operating voltage is ≤14 V for margin under temperature and transients. The TLC5952DAPR maintains constant-current regulation across this range when configured with appropriate RIREF.

How does the TLC5952DAPR implement open-LED detection?

The TLC5952DAPR performs open-LED detection by monitoring voltage at each OUTx pin during active drive. When an LED opens, the pin voltage rises toward VLED supply; the device compares it against four programmable thresholds (0.25 V, 0.5 V, 0.8 V, or 1.2 V). Detection status is stored in an internal register and read back via the serial interface. This function operates independently per channel and is enabled by default in the TLC5952DAPR configuration.

Can multiple TLC5952DAPR devices be connected in series?

Yes, the TLC5952DAPR supports daisy-chaining via its SIN and SOUT pins. Data shifted into SIN propagates through the internal 25-bit register and exits SOUT, allowing seamless connection to the next device's SIN. LAT and BLANK signals are shared across all devices in the chain, ensuring synchronized updates. This architecture enables expansion to hundreds of channels using only four control lines - a core capability confirmed in the TLC5952DAPR datasheet Figure 2.

What is the role of the RIREF resistor in the TLC5952DAPR?

The RIREF resistor connected between IREF (Pin 32) and GND sets the full-scale output current for all 24 channels of the TLC5952DAPR. Its value determines both red/green (35 mA max) and blue (26.2 mA max) group currents via internal scaling. For example, a 1.5 kΩ resistor yields ~35 mA for red/green and ~26.2 mA for blue outputs. The relationship is inverse-linear: lower resistance increases current, and the TLC5952DAPR's internal reference voltage (1.2 V nominal) defines the exact ratio.

Does the TLC5952DAPR include thermal protection?

Yes, the TLC5952DAPR integrates thermal shutdown (TSD) that activates at 150°C junction temperature, with 5–20°C hysteresis. Upon trip, all outputs disable immediately and the device enters auto-restart mode - re-enabling outputs once junction temperature falls below the hysteresis threshold. This behavior is fully specified in the Electrical Characteristics table (TTEF and THYS parameters) and protects the TLC5952DAPR during sustained overloads or inadequate PCB heatsinking.