Texas Instruments TLC5930PWPRG4

Overview

TLC5930PWPRG4 from Texas Instruments is a 12-channel constant-current LED sink driver with 1024-step PWM grayscale control, 0.2–40 mA per channel, and DS-Link serial interface operating up to 20 Mbps. It supports three independent brightness adjustment methods (plane, frequency division, dot correction), thermal error flag, OVM-based LED open-circuit detection, and operates from a 3.3-V LVTTL supply. It targets high-fidelity RGB LED display panels requiring precise per-pixel current control.

For engineers reviewing the TLC5930PWPRG4 datasheet, TLC5930PWPRG4 pinout, TLC5930PWPRG4 application, or TLC5930PWPRG4 equivalent, key selection criteria include its 24-pin HTSSOP package, 12-bit output resolution, 25-MHz max GCLK frequency, IREF-based current programming, and cascaded DS-Link topology for multi-device synchronization in full-color signage and stage lighting systems.

Technical Context

The TLC5930PWPRG4 implements a 12-bit PWM grayscale engine synchronized to an external or internally generated gray-scale clock (GCLK), with latch timing controlled by HSYNC packet edges. Its DS-Link interface uses DTIN/STIN inputs and DTOUT/STOUT outputs to enable daisy-chained configuration of multiple drivers without additional address lines.

It integrates three concurrent brightness control layers: plane-level current scaling (64 steps), frequency-division-based panel dimming (16 steps), and per-output dot correction (256 steps). Built-in diagnostics include thermal error flag (TEF), LED leakage detection (LKD), OVM fault monitoring, and GCLK/HSYNC error flags - all accessible via read-back packets.

Key Specifications

Pinout & Package

Package: 24-pin HTSSOP (PWP) with PowerPAD thermal pad; 4.4 mm × 7.8 mm footprint; exposed thermal pad on underside for enhanced heat dissipation in high-current LED driving.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC5940PWPR and IS31FL3731-QFLS4-TR, the TLC5930PWPRG4 uniquely combines DS-Link daisy-chaining, OVM fault detection per channel, and triple-layer brightness control - making it optimal for large-scale, fault-aware LED video walls where signal integrity and diagnostic visibility are critical.

Availability

TLC5930PWPRG4 is available at Aetrix Electronics and suitable for RGB video signage, stage lighting control, architectural accent lighting, and industrial HMI panels requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TLC5930PWPRG4 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 connectivity technologies, with decades of experience in precision power and signal chain solutions.

The TLC5930PWPRG4 belongs to TI's LED driver product line, engineered specifically for high-resolution, high-reliability LED display systems requiring per-pixel current accuracy, real-time fault monitoring, and scalable multi-device control.

FAQ

What is the maximum number of TLC5930PWPRG4 devices that can be daisy-chained using DS-Link?

The TLC5930PWPRG4 supports cascading up to 256 devices in a single DS-Link chain. Each device introduces a fixed 2-bit pipeline delay, so total data latency scales linearly with chain length. For reliable operation, the controller must inject dummy bits equal to twice the number of devices in the chain to complete packet propagation - for example, 32 dummy bits for 16 devices. This architecture eliminates address decoding logic and reduces PCB routing complexity in large LED arrays.

How does the TLC5930PWPRG4 implement dot correction, and what is its practical impact on display quality?

The TLC5930PWPRG4 implements 8-bit dot correction per output (OUT0–OUT11), allowing per-LED current adjustment in 256 steps (0% to 100% of nominal current). This corrects luminance and chromaticity variations caused by LED manufacturing tolerances and aging. In practice, applying factory-measured correction values improves display uniformity to <±3% luminance deviation across panels - critical for broadcast-grade video walls where visible banding or color fringing must be eliminated.

Can the TLC5930PWPRG4 operate without an external IREF resistor?

No - the TLC5930PWPRG4 requires an external resistor between IREF and GND to set output current. The device sources approximately 168× the current flowing through that resistor to all 12 outputs. Leaving IREF unconnected or shorted to VCC results in undefined or excessive current. TI specifies R_IREF ≤ 4.88 kΩ for 40 mA full-scale output; lower resistance increases current linearly. For example, a 5.1 kΩ resistor yields ~40 mA, while 2.5 kΩ yields ~80 mA - exceeding absolute maximum ratings and risking damage.

What diagnostic functions does the TLC5930PWPRG4 provide, and how are they accessed?

The TLC5930PWPRG4 provides five diagnostic functions: thermal error flag (TEF), open-voltage monitor (OVM), LED leakage detect (LKD), GCLK error flag (GEF), and HSYNC error flag (HEF). These are accessed via dedicated read-back packets (e.g., OVM information read = 0x50 command). Each flag is latched and readable until cleared by internal reset or XRST assertion. TEF activates at 150–170°C junction temperature; OVM detects open-circuit LEDs using a 0.3-V comparator threshold; LKD identifies reverse leakage >0.1 µA. All flags feed into system-level fault handling without external circuitry.

Does the TLC5930PWPRG4 support both external and internal gray-scale clock sources?

Yes - the TLC5930PWPRG4 supports dual-source gray-scale clocking via its DSG (dual-source gray-scale) function. When DSGSL = 0 (default), GCLK is sourced from the external GCLK pin. When DSGSL = 1, the gray-scale clock is generated internally by counting edges on DTIN/STIN - eliminating the need for a dedicated clock line in space-constrained layouts. This flexibility allows designers to choose between precise external timing control or simplified two-wire (DTIN/STIN only) operation, with identical 1024-step PWM performance in either mode.