Texas Instruments TLC5923DAPRG4

Overview

TLC5923DAPRG4 from Texas Instruments is a 16-channel constant-current LED sink driver with 7-bit per-channel dot correction (128-step brightness adjustment), ±1% typical current accuracy, and thermal/LED-open error detection. It operates from 3.0 V to 5.5 V supply, supports up to 80 mA per channel, and drives LEDs with up to 17 V forward voltage - used in full-color LED displays and signage requiring precise luminance uniformity.

For engineers reviewing the TLC5923DAPRG4 datasheet, TLC5923DAPRG4 pinout, TLC5923DAPRG4 application, or TLC5923DAPRG4 equivalent, key selection considerations include its HTSSOP-32 PowerPAD™ package, 30 MHz serial interface, BLANK-controlled global output disable, and dual-mode serial control (ON/OFF vs. dot-correction data) via MODE pin.

Technical Context

The TLC5923DAPRG4 implements two independent 16-bit shift-register paths: one for 16-bit ON/OFF control (MODE = L) and another for 112-bit dot-correction data (MODE = H). Each channel's output current is set by a single external IREF resistor and scaled 40×, enabling precise per-channel brightness calibration across LED arrays.

It integrates LED open detection (LOD) that triggers when OUTn voltage falls below 0.3 V while the channel is enabled and BLANK is low, plus thermal error flag (TEF) activation at ~160°C junction temperature. Both errors drive the open-drain XERR output low, supporting system-level fault reporting without additional logic.

Key Specifications

Pinout & Package

Package: 32-pin HTSSOP (DAP) with exposed thermal PowerPAD™ - optimized for high-current LED driving and thermal dissipation (5318 mW max at TA < 25°C, derated 42.54 mW/°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC5923DAPRG4, TLC5940RHBR offers deeper grayscale but sacrifices integrated fault reporting and single-resistor current scaling; IS31FL3728-QFLS4-TR simplifies bus architecture but trades off maximum drive strength and per-channel analog correction fidelity.

Availability

TLC5923DAPRG4 is available at Aetrix Electronics and suitable for LED signage, display backlighting, and architectural lighting applications requiring stable component supply, long-term production continuity, and RoHS-compliant HTSSOP packaging.

Supply support for TLC5923DAPRG4 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 ICs, with decades of expertise in high-reliability LED driver design.

The TLC5923 product line targets high-precision LED array control in commercial signage and industrial displays, emphasizing current accuracy, fault resilience, and thermal robustness over basic switching functionality.

FAQ

What is the maximum LED forward voltage supported by the TLC5923DAPRG4?

The TLC5923DAPRG4 supports up to 17 V at its OUT0–OUT15 pins, enabling direct drive of multi-LED series strings without external boost circuitry. This rating is absolute maximum; recommended operating voltage is ≤15 V for margin. The device maintains 80 mA sink capability across this range when VCC ≥ 3.0 V and thermal limits are observed. Always verify voltage headroom relative to your specific LED string V_F sum at operating current.

How does the TLC5923DAPRG4 implement dot correction, and what is its resolution?

The TLC5923DAPRG4 implements per-channel dot correction using a 7-bit digital value (0–127) stored in dedicated DC registers, scaling each channel's output current from 0% to 100% of the maximum set by IREF. All 16 channels must be programmed simultaneously via a 112-bit serial packet (16 × 7 bits). Resolution is 1/128 step, with typical current accuracy of ±1% across channels when calibrated at nominal conditions.

What are the functional differences between the BLANK and XLAT pins on the TLC5923DAPRG4?

BLANK (Pin 2) is a global hardware override: when HIGH, it forces all 16 outputs OFF regardless of ON/OFF register contents or dot-correction settings - used for flicker-free blanking or emergency shutdown. XLAT (Pin 3) is a data latch control: rising edge captures 16-bit ON/OFF data (MODE = L), while sustained HIGH enables writing to dot-correction registers (MODE = H). BLANK affects output state; XLAT affects register loading.

Can multiple TLC5923DAPRG4 devices be cascaded, and how is data routed?

Yes - TLC5923DAPRG4 supports daisy-chain cascading via SOUT-to-SIN connection. Serial data flows from controller → SIN of first device → SOUT → SIN of second device, etc. Each device shifts its portion of the data packet (16 bits for ON/OFF, 112 bits for dot correction) based on MODE state. XLAT must be asserted after full packet transmission to latch data into respective registers across all devices in the chain.

How does the LED Open Detection (LOD) feature work on the TLC5923DAPRG4?

LOD activates when three conditions coexist: (1) BLANK = LOW, (2) the channel's ON/OFF bit = HIGH, and (3) the corresponding OUTn voltage drops below 0.3 V (typical). This indicates an open-circuit LED. Detected faults pull the shared XERR pin low. LOD status per channel can also be read back serially via SOUT after latching with XLAT, enabling diagnostic logging without external sensors.