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Texas Instruments TLC5951RTAR
- Part No.:
- TLC5951RTAR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
TLC5951RTAR.pdf
- Description:
- IC LED DRIVER LINEAR 40MA 40WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,455
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Product details
Overview
TLC5951RTAR from Texas Instruments is a 24-channel, constant-current sink LED driver IC with independent RGB group control, 12-bit PWM grayscale (4096 steps), 7-bit dot correction (128 steps), and 8-bit per-group global brightness control. It supports daisy-chained operation for full-color LED displays and delivers up to 40 mA per channel with ±1.5% channel-to-channel current matching.
For engineers reviewing the TLC5951RTAR datasheet, TLC5951RTAR pinout, TLC5951RTAR application, or TLC5951RTAR equivalent, key selection considerations include its triple independent grayscale clocks (GSCKR/GSCKG/GSCKB), integrated LED open/short detection (LOD/LSD), thermal shutdown with auto-restart, and support for 30 MHz serial data transfer across GSSIN/DCSIN interfaces.
Technical Context
The TLC5951RTAR implements a dual-path serial interface: a 288-bit common shift register (GSSIN/GSSCK/GSLAT/GSSOUT) for grayscale and function data, and a separate 216-bit dedicated register (DCSIN/DCSCK/DCSOUT) for dot correction and global brightness configuration. Each of the three 8-channel output groups (RED/GREEN/BLUE) operates under its own grayscale clock and brightness register, enabling precise color balance in multi-LED systems.
It integrates continuous base LED-open detection (LOD), LED-short detection (LSD), and thermal error flag (TEF) circuits - all accessible via GSSOUT readback. The device uses grouped delay switching (24 ns typical between paired outputs) to suppress inrush current and includes auto-display repeat functionality for seamless static image rendering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output channels | 24 constant-current sinks, grouped as 8 RED + 8 GREEN + 8 BLUE |
| Grayscale resolution | 12-bit (4096-step) PWM per channel; selectable 10-bit or 8-bit modes |
| Dot correction | 7-bit (128-step) per channel, adjustable to correct inter-channel LED brightness variance |
| Global brightness control | 8-bit (256-step) per color group, independent for RED/GREEN/BLUE |
| Max output current | 40 mA per channel, set by external IREF resistor (e.g., 1.2 kΩ) |
| Current accuracy | ±1.5% channel-to-channel mismatch within same color group |
| Data rate | 30 MHz serial clock (GSSCK/DCSCK), supporting fast display updates |
| Operating temperature | –40°C to +85°C ambient, with thermal shutdown at 150°C junction |
Pinout & Package
Package: QFN-40 (RTA variant), 6.00 mm × 6.00 mm body with exposed thermal pad. Pin count: 40. Compatible with standard reflow profiles; thermal pad must be soldered for reliable power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GSSIN | Serial input (grayscale/function) | LSB input for 288-bit common shift register; internally pulled down (500 kΩ) |
| GSSCK | Grayscale serial clock | Rising-edge-shift clock for GS/DC/BC/FC data; max 30 MHz |
| GSLAT | Data latch control | Rising edge copies GSSIN data to GS latch (low) or DC/BC/FC latch (high) |
| GSCKR / GSCKG / GSCKB | Per-group grayscale clocks | Independent 33-MHz PWM timing references for RED/GREEN/BLUE groups |
| DCSIN / DCSCK / DCSOUT | Dedicated dot-correction interface | 216-bit serial path for DC/BC/FC/UD data; MSB out on DCSOUT |
| IREF | Current reference input/output | Resistor-to-GND sets full-scale output current (e.g., 1.2 kΩ → 40 mA) |
| XBLNK | Blanking control | Active-low global disable; resets grayscale counters and forces all outputs OFF |
| OUTR0–OUTR7 / OUTG0–OUTG7 / OUTB0–OUTB7 | Constant-current sink outputs | 24 total; each pair switches with 24 ns delay to limit di/dt and EMI |
| VCC / GND | Power supply | 3.0 V to 5.5 V logic supply; GND referenced for all analog/digital functions |
| GSSOUT | Serial output / status readback | MSB of 288-bit register; returns LOD/LSD/TEF flags and latch data |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent grayscale clocks | Enables synchronized yet independent PWM timing for RGB subpixels without color skew |
| Integrated LED fault detection | Continuous LOD/LSD monitoring per channel with real-time flag readback via GSSOUT |
| Grouped output switching | 24 ns staggered turn-on/off between paired outputs reduces peak supply current and EMI |
| Auto-display repeat mode | Hardware-enabled static image persistence without host MCU intervention |
| Dual serial interfaces | Separate GSS and DCS paths prevent interference between grayscale updates and calibration writes |
| Thermal shutdown with auto-restart | Protects against sustained overtemperature; resumes operation after cooling below threshold |
Applications
| LED Video Wall Tiles | RGB Signage Modules |
|---|---|
|
Use Scenario: High-density indoor/outdoor LED video walls requiring uniform color fidelity across thousands of pixels. IC Role / Device Role / Timing Role: Constant-current sink driver managing 24 RGB subpixels per tile, with per-group brightness tuning and dot correction for factory calibration. Use Value: Eliminates visible color banding by correcting LED binning variance via 7-bit DC and 8-bit BC per group, while 12-bit GS ensures smooth motion gradation. |
Use Scenario: Modular alphanumeric and icon-based signage with dynamic content updates and long operational life. IC Role / Device Role / Timing Role: Primary LED driver in daisy-chained modules, using XBLNK for synchronized frame blanking and GSCKR/GSCKG/GSCKB for independent color refresh. Use Value: Reduces host controller bandwidth demand via auto-repeat mode and enables real-time fault reporting (LOD/LSD) for predictive maintenance. |
| Stage Lighting Fixtures | Automotive Interior Ambient Lighting |
|
Use Scenario: DMX-controlled stage lighting with programmable white-point tuning and high-speed color transitions. IC Role / Device Role / Timing Role: RGB channel driver receiving SPI commands via GSSIN/DCSIN, applying per-group BC for CCT adjustment and GS for intensity ramping. Use Value: Achieves flicker-free dimming down to 0.02% brightness (12-bit GS) and maintains color consistency across temperature via ±1.5% channel matching. |
Use Scenario: Multi-zone cabin lighting with soft-start, fade effects, and diagnostic readiness for automotive OEM compliance. IC Role / Device Role / Timing Role: Embedded LED driver in lighting control units, leveraging thermal shutdown (TSD) and LOD detection for ASIL-B-aligned functional safety monitoring. Use Value: Supports AEC-Q100 stress testing with –40°C to +85°C operation, and grouped delay switching meets automotive EMC requirements (CISPR 25 Class 3). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5947RTQR | 16-channel, 12-bit GS, no per-group BC; single GSCLK; 32-pin QFN | Lacks independent RGB brightness control and triple grayscale clocks; lower channel count | Choose when system uses uniform white-point tuning and requires fewer outputs per IC |
| IS31FL3731-QFLS4-TR | 28-channel, 8-bit GS only; no dot correction; I²C interface; 40-pin QFN | No hardware LOD/LSD; no dedicated DC/BC registers; relies on software calibration | Prefer for cost-sensitive designs where I²C simplifies host interface and 8-bit GS suffices |
Compared with TLC5951RTAR, TLC5947RTQR offers reduced channel density and no per-group brightness control, while IS31FL3731-QFLS4-TR trades hardware-level fault detection and dot correction for simpler I²C integration and lower gate count - making TLC5951RTAR optimal for high-fidelity RGB display systems demanding precision calibration and robust diagnostics.
Availability
TLC5951RTAR is available at Aetrix Electronics and suitable for full-color LED displays, LED signboards, and stage lighting systems requiring stable component supply, long-term manufacturability, and consistent parametric performance across production batches.
Supply support for TLC5951RTAR 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 technologies, with leadership in power management, signal chain, and high-reliability interface solutions.
The TLC5951RTAR belongs to TI's high-performance LED driver product line, designed specifically for professional-grade RGB visual systems requiring precise current matching, real-time fault visibility, and scalable daisy-chain architecture.
FAQ
What is the maximum LED supply voltage supported by the TLC5951RTAR?
The TLC5951RTAR supports LED anode supply voltages up to 15 V on its OUTx pins, independent of the 3.0–5.5 V VCC logic supply. This allows direct driving of common-anode LED arrays with higher forward voltage drops (e.g., blue/white LEDs in series) without external boost circuitry. The device maintains 40 mA sink capability across the full 15 V range, verified per electrical characteristics table.
How does the TLC5951RTAR implement LED open detection (LOD)?
The TLC5951RTAR performs continuous base LOD by monitoring voltage at each OUTx pin during active sink periods. If an output remains at or near VLED (indicating no current flow), the internal circuit asserts the LOD flag. This status is readable via GSSOUT after a GSLAT-triggered latch event. LOD detection operates autonomously without host intervention and is confirmed in the device's functional block diagram and pin description table.
Can the TLC5951RTAR be used in daisy-chained configurations?
Yes, the TLC5951RTAR supports robust daisy-chaining via its GSSOUT-to-GSSIN and DCSOUT-to-DCSIN connections. Data propagates through the 288-bit common register and 216-bit dedicated register across multiple devices with cycle-accurate timing. The datasheet provides a typical application circuit showing up to 16 devices chained, and timing specifications (e.g., tSU0, tH0) guarantee reliable inter-device synchronization at 30 MHz.
What is the role of the IREF pin on the TLC5951RTAR?
The IREF pin on the TLC5951RTAR serves as the reference node for setting the full-scale output current. A resistor (e.g., 1.2 kΩ) connected between IREF and GND establishes a reference current that scales all 24 output channels proportionally. The relationship is defined as IOUT = 40 mA × (1.2 kΩ / RIREF); this linear scaling is validated in the Electrical Characteristics table under IOLC test conditions.
Does the TLC5951RTAR support different grayscale bit depths?
Yes, the TLC5951RTAR supports configurable grayscale resolution: 12-bit (4096 steps), 10-bit (1024 steps), or 8-bit (256 steps), selected via function control bits in the FC register. This flexibility allows trade-offs between update speed and intensity resolution - for example, 8-bit mode doubles refresh rate for fast-motion video, while 12-bit mode maximizes smoothness in static displays. All modes retain full dot correction and global brightness functionality.
TLC5951RTAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- Shift Register
- Internal Switch(s):
- Yes
- Number of Outputs:
- 24
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 15V
- Current - Output / Channel:
- 40mA
- Frequency:
- 30MHz
- Dimming:
- -
- Applications:
- Signage
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-WQFN (6x6)
TLC5951RTAR FAQ
1.How can I place an order for TLC5951RTAR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5951RTAR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TLC5951RTAR reliable?
The price and inventory of TLC5951RTAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5951RTAR is usually 5 days.
3.What payment methods are accepted for TLC5951RTAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5951RTAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5951RTAR?
TLC5951RTAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5951RTAR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TLC5951RTAR?
For technical support, including TLC5951RTAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5951RTAR requirements.
6.How does Aetrix verify that TLC5951RTAR is sourced from the original manufacturer or authorized distributors?
All TLC5951RTAR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TLC5951RTAR meets industry standards.
7.What is the process for return or replacement of TLC5951RTAR?
All TLC5951RTAR units undergo pre-shipment inspection (PSI). If there is an issue with TLC5951RTAR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TLC5951RTAR part is unused and in its original packaging.
Return procedure for TLC5951RTAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLC5951RTAR Tags
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LYT1604D-TL
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CL2N8-G
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