Texas Instruments TLC5924RHBTG4

Overview

TLC5924RHBTG4 from Texas Instruments is a 16-channel constant-current LED sink driver with integrated dot correction (7-bit per channel), pre-charge FETs, LED open detection (LOD), and thermal error flag (TEF). It delivers ±1% typical current accuracy across 0–80 mA per channel, supports 30 MHz serial data transfer, and operates from 3.0 V to 5.5 V supply with up to 17 V LED supply (VUP). It is used in high-reliability dynamic LED displays requiring precise brightness uniformity and fault monitoring.

For engineers reviewing the TLC5924RHBTG4 datasheet, TLC5924RHBTG4 pinout, TLC5924RHBTG4 application, or TLC5924RHBTG4 equivalent, this page provides verified functional context, validated package mapping (32-pin QFN, RHB), confirmed pin roles including MODE-selectable serial interface, real-world timing constraints (e.g., 10 ns setup/hold), and two technically documented alternative drivers for display backlighting and signage systems.

Technical Context

The TLC5924RHBTG4 implements dual-mode serial control via the MODE pin: low for 16-bit ON/OFF register latching on XLAT rising edge, high for 112-bit dot-correction data loading with XLAT level-triggered write. Its internal architecture includes independent 7-bit DC registers, on/off registers, and graduated 20 ns inter-channel delay to limit inrush current.

Each output integrates a pre-charge FET controlled synchronously with BLANK, enabling improved image quality in multiplexed LED displays. Error reporting combines open-drain XERR with LOD (triggered at <0.3 V OUTn under ON condition) and TEF (activated at ~160°C junction temperature), both readable via SOUT or asserted collectively on XERR.

Key Specifications

Pinout & Package

Package: 32-pin VQFN (RHB), 5 mm × 5 mm, exposed thermal pad (PowerPAD™), RoHS-compliant, MSL Level-2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC5924RHBTG4, TLC5940RHBR offers finer grayscale control but requires external fault monitoring and lacks pre-charge for high-speed multiplexing; MAX7219CWG+ reduces system complexity for basic 8-channel matrices but cannot match the 16-channel, dot-corrected, fault-aware operation required in professional signage.

Availability

TLC5924RHBTG4 is available at Aetrix Electronics and suitable for LED signboards, full-color displays, display backlighting, and multicolor architectural lighting requiring stable component supply and long-term industrial availability.

Supply support for TLC5924RHBTG4 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 specializing in analog and embedded processing solutions, with leadership in precision analog, power management, and interface ICs.

The TLC5924RHBTG4 belongs to TI's LED driver product line, designed specifically for high-reliability, high-brightness dynamic LED displays requiring per-channel brightness calibration, fault diagnostics, and robust thermal management.

FAQ

What is the maximum output current per channel for the TLC5924RHBTG4?

The TLC5924RHBTG4 supports a maximum constant-current sink of 80 mA per channel (OUT0–OUT15), set by an external resistor on the IREF pin. The relationship is IMAX = 40 × V_IREF/R_IREF, where V_IREF is typically 1.24 V. Minimum R_IREF is 600 Ω, yielding up to 80 mA. Current accuracy is ±1% typical across channels at 25°C.

How does the MODE pin affect serial communication with the TLC5924RHBTG4?

The MODE pin configures the TLC5924RHBTG4's serial interface: when MODE = LOW, the device accepts 16-bit ON/OFF data (1 bit per channel) latched on XLAT rising edge; when MODE = HIGH, it accepts 112-bit dot-correction data (7 bits per channel), written while XLAT is held HIGH. This dual-mode design separates basic control from fine brightness calibration without requiring separate command protocols.

Can the TLC5924RHBTG4 detect open-circuit LEDs, and how is that reported?

Yes, the TLC5924RHBTG4 performs LED open detection (LOD) on each output: if BLANK = LOW, the channel is ON, and OUTn voltage falls below 0.3 V (typical), LOD triggers. Detection status is reported collectively via the open-drain XERR pin and individually via SOUT when XLAT = LOW and SCLK shifts out 16-bit LOD data. This enables both system-level fault alerts and per-channel diagnostics.

What is the purpose of the pre-charge FET in the TLC5924RHBTG4, and how is it controlled?

The pre-charge FET in the TLC5924RHBTG4 rapidly charges LED segment lines to VUP before sink activation, eliminating ghosting and improving contrast in multiplexed displays. It activates automatically when BLANK goes HIGH (turning off all sinks) and deactivates just after BLANK returns LOW. Both VUP pins (2 and 23) must be connected to the same pre-charge supply rail for proper operation.

Does the TLC5924RHBTG4 include thermal protection, and what happens when it triggers?

Yes, the TLC5924RHBTG4 includes a thermal error flag (TEF) that activates when junction temperature exceeds ~160°C (typical). When triggered, TEF pulls the open-drain XERR pin LOW - identical to LOD assertion - allowing unified fault reporting. TEF clears automatically once junction temperature drops below the hysteresis threshold. No latch or reset is required; the TLC5924RHBTG4 resumes normal operation upon cooling.