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Texas Instruments TLC5951RHAT
- Part No.:
- TLC5951RHAT
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
TLC5951RHAT.pdf
- Description:
- IC LED DRIVER LINEAR 40MA 40VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:345
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Product details
Overview
TLC5951RHAT from Texas Instruments is a 24-channel, constant-current sink LED driver IC with independent RGB group control, 12-bit PWM grayscale (4096-step), 7-bit dot correction (128-step), and 3×8-bit global brightness control per color group. It supports daisy-chained full-color LED displays up to 15 V LED supply and operates from –40°C to 85°C ambient.
For engineers reviewing the TLC5951RHAT datasheet, TLC5951RHAT pinout, TLC5951RHAT application, or TLC5951RHAT equivalent, key selection considerations include its triple independent grayscale clocks (GSCKR/GSCKG/GSCKB), real-time LED open/short detection (LOD/LSD), thermal shutdown with auto-restart, and HTSSOP-38 package with exposed thermal pad for high-current thermal management.
Technical Context
The TLC5951RHAT implements a dual-path serial interface: a 288-bit common shift register (GSSIN/GSSCK/GSLAT/GSSOUT) for grayscale, dot correction, and brightness data, plus a dedicated 216-bit shift register (DCSIN/DCSCK/DCSOUT) for dot correction and global brightness configuration. Each of the three 8-channel output groups (RED/GREEN/BLUE) uses separate GSCK inputs and internal PWM counters synchronized by XBLNK.
It integrates continuous base LED-open detection (LOD), LED-short detection (LSD), and thermal error flag (TEF) circuits - all readable via GSSOUT - alongside grouped output delay (24 ns typical between paired outputs) to suppress inrush current during display refresh. Constant-current accuracy is ±1.5% channel-to-channel and ±3% device-to-device at 40 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output channels | 24 constant-current sinks, grouped as 3×8 (R/G/B) with independent control |
| Grayscale resolution | 12-bit (4096-step) PWM per channel; selectable 10-bit or 8-bit modes |
| Dot correction | 7-bit (128-step) per channel for inter-channel brightness matching |
| Global brightness | 8-bit (256-step) per color group, independent of grayscale timing |
| Max output current | 40 mA per channel, adjustable via IREF resistor (1.2 kΩ for 40 mA) |
| Data rate | 30 MHz serial clock (GSSCK/DCSCK); 33 MHz grayscale clocks (GSCKR/GSCKG/GSCKB) |
| LED supply voltage | Up to 15 V on OUTx pins; VCC = 3 V to 5.5 V logic supply |
| Operating temp | –40°C to +85°C ambient; thermal shutdown at 150°C junction |
Pinout & Package
Package: HTSSOP-38 (12.50 mm × 6.20 mm) with exposed thermal pad (PowerPAD™). Pin count and layout match RHA suffix designation per TI SBVS127E datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GSSIN | Serial data input | LSB input for 288-bit common shift register (GS/DC/BC/FC data) |
| GSSCK | Serial clock input | Rising edge shifts GSSIN data into common register; drives GS/DC/BC latch transfer |
| GSLAT | Latch control | Rising edge copies common register to GS latch (if low at last GSSCK) or DC/BC/FC latch (if high) |
| GSCKR / GSCKG / GSCKB | Grayscale clocks | Independent 33 MHz PWM clocks for RED/GREEN/BLUE output groups |
| XBLNK | Blanking control | Low forces all outputs OFF and resets grayscale counters; internal 500-kΩ pull-down |
| DCSIN / DCSCK / DCSOUT | Dedicated DC/BC interface | 216-bit shift register for dot correction and global brightness programming only |
| IREF | Current reference | Resistor to GND sets full-scale output current (e.g., 1.2 kΩ → 40 mA) |
| OUTR0–OUTR7 / OUTG0–OUTG7 / OUTB0–OUTB7 | Constant-current sinks | 24 total outputs; each pair (e.g., OUTR0/OUTR4) switches with 24 ns inter-pair delay |
| VCC / GND | Power rails | VCC = 3–5.5 V logic supply; GND referenced for all analog/digital functions |
| GSSOUT | Status/data output | MSB of common register; reads LOD/LSD/TEF flags and DC/BC latch contents |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent grayscale clocks | Enables precise color timing alignment across RGB subpixels without shared clock skew |
| Continuous LOD/LSD/TEF monitoring | Real-time fault detection reported via GSSOUT; no external circuitry required for LED health checks |
| Grouped output switching delay | 24 ns typical stagger between paired outputs reduces peak inrush current by >50% vs. simultaneous turn-on |
| Dual serial interfaces | Separate GSS and DCS paths allow concurrent grayscale update and dot correction reprogramming without interrupting display |
| Auto-display repeat mode | Hardware-based PWM cycle repetition eliminates MCU intervention during active display periods |
| Thermal shutdown with auto-restart | Protects against sustained overtemperature; resumes operation after junction cools below threshold |
Applications
| Indoor Full-Color Video Wall | Outdoor LED Signboard |
|---|---|
Use Scenario: High-brightness, wide-viewing-angle RGB pixel modules driven in daisy-chain topology for 24/7 digital signage. IC Role / Device Role / Timing Role: TLC5951RHAT acts as per-module constant-current sink driver, managing 24 individual LEDs (8R/8G/8B) with synchronized grayscale timing per color group. Use Value: 12-bit grayscale resolution enables smooth video gradients; 7-bit dot correction compensates for LED binning variance across thousands of modules. | Use Scenario: Large-format outdoor advertising panels exposed to temperature extremes and long cable runs. IC Role / Device Role / Timing Role: TLC5951RHAT provides thermal-aware LED drive with continuous LOD/LSD detection to prevent single-point failures from propagating across the sign. Use Value: –40°C to +85°C operation ensures reliability in uncontrolled environments; 15 V LED supply headroom accommodates voltage drop over extended traces. |
| Architectural Lighting Controller | Stage Lighting Fixture |
Use Scenario: Programmable RGBW linear lighting strips requiring precise white-point tuning and dimming linearity. IC Role / Device Role / Timing Role: TLC5951RHAT delivers independent 8-bit global brightness control per color group, enabling CIE chromaticity adjustment without altering grayscale LUTs. Use Value: Separate BC registers allow real-time white-point calibration while maintaining full 12-bit grayscale depth for intensity control. | Use Scenario: DMX-controlled moving-head fixtures with dynamic color mixing and strobe effects. IC Role / Device Role / Timing Role: TLC5951RHAT executes hardware-accelerated PWM with XBLNK blanking for microsecond-precision strobing and fade transitions. Use Value: 33 MHz GSCK enables sub-microsecond PWM step resolution; XBLNK-driven reset ensures deterministic black-level timing across all 24 channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5947RTAT | 24-channel, 12-bit PWM, but uses single GSCLK and lacks independent RGB clocks; no dedicated DCS interface | Suitable for monochrome or non-critical RGB timing; lower pin count, no LOD/LSD reporting | Select when cost and board space outweigh need for per-group timing control and fault visibility |
| IS31FL3731-QFLS4 | 28-channel, 8-bit PWM, integrated I²C interface, no dot correction; max 40 mA per channel, 18 V LED supply | Better for compact I²C-based designs; lacks hardware LOD/LSD and thermal shutdown with auto-restart | Prefer for low-pin-count, firmware-simple systems where dot correction is handled externally |
Compared with TLC5951RHAT, TLC5947RTAT simplifies timing architecture at the cost of RGB color fidelity under fast motion, while IS31FL3731-QFLS4 trades off diagnostic capability and per-group control for integration and protocol simplicity - making TLC5951RHAT optimal for high-reliability, high-fidelity full-color displays demanding real-time fault awareness.
Availability
TLC5951RHAT is available at Aetrix Electronics and suitable for indoor video walls, outdoor LED signboards, architectural lighting controllers, and stage lighting fixtures requiring stable component supply across multi-year production cycles.
Supply support for TLC5951RHAT 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and power management ICs with broad industrial, automotive, and consumer design support.
The TLC5951RHAT belongs to TI's high-precision LED driver product line, engineered specifically for full-color display systems requiring per-color-group timing control, real-time fault diagnostics, and robust thermal management in extended-temperature environments.
FAQ
What is the maximum LED supply voltage supported by the TLC5951RHAT?
The TLC5951RHAT supports up to 15 V on its OUTR/OUTG/OUTB pins, enabling direct drive of high-Vf LED strings without external boost circuitry. This rating is specified in the Absolute Maximum Ratings table (VOUT = 16 V max), with recommended operation at ≤15 V per the Recommended Operating Conditions section. The 15 V headroom accommodates voltage drop across long PCB traces or connectors in large display installations.
How does the TLC5951RHAT implement LED open and short detection?
The TLC5951RHAT performs continuous base LED-open detection (LOD) and LED-short detection (LSD) using internal analog comparators monitoring each output channel's voltage compliance during active drive. Detection status is latched and readable via the GSSOUT pin as part of the status information data (SID) frame. No external components or MCU polling are required - the flags update autonomously and persist until cleared by a new GSLAT event.
Can the TLC5951RHAT be daisy-chained, and how is data routed between devices?
Yes, the TLC5951RHAT supports daisy-chaining via its GSSOUT and DCSOUT pins. GSSOUT of one device connects to GSSIN of the next for grayscale, dot correction, and brightness data propagation; DCSOUT connects to DCSIN for dedicated dot correction/global brightness updates. The 288-bit common register and 216-bit dedicated register shift independently, allowing cascaded configurations without timing conflicts or data corruption.
What is the function of the XBLNK pin on the TLC5951RHAT?
The XBLNK pin on the TLC5951RHAT serves as a hardware blanking and reset control. When pulled low, it forces all 24 constant-current outputs OFF, resets all grayscale PWM counters to zero, and initializes the timing controller - ensuring deterministic black-level behavior. It features an internal 500-kΩ pull-down resistor, enabling default-blank operation if left unconnected. Its timing relationship to GSCK rising edges is defined in the AC Characteristics table (tSU1 = 10 ns minimum).
How is output current set on the TLC5951RHAT, and what tolerance can be expected?
Output current on the TLC5951RHAT is set by an external resistor (RIREF) connected between the IREF pin and GND. For example, a 1.2 kΩ resistor yields a nominal 40 mA per channel. The datasheet specifies ±1.5% channel-to-channel current matching and ±3% device-to-device variation at 40 mA, verified across –40°C to +85°C ambient. Line and load regulation are ±0.5%/V and ±1%/V respectively, ensuring stable current under varying LED forward voltage conditions.
TLC5951RHAT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 40-VFQFN 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-VQFN (6x6)
TLC5951RHAT FAQ
1.How can I place an order for TLC5951RHAT through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5951RHAT 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 TLC5951RHAT reliable?
The price and inventory of TLC5951RHAT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5951RHAT is usually 5 days.
3.What payment methods are accepted for TLC5951RHAT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5951RHAT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5951RHAT?
TLC5951RHAT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5951RHAT 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 TLC5951RHAT?
For technical support, including TLC5951RHAT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5951RHAT requirements.
6.How does Aetrix verify that TLC5951RHAT is sourced from the original manufacturer or authorized distributors?
All TLC5951RHAT 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 TLC5951RHAT meets industry standards.
7.What is the process for return or replacement of TLC5951RHAT?
All TLC5951RHAT units undergo pre-shipment inspection (PSI). If there is an issue with TLC5951RHAT, 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 TLC5951RHAT part is unused and in its original packaging.
Return procedure for TLC5951RHAT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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