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Texas Instruments TLC6948RGER
- Part No.:
- TLC6948RGER
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
TLC6948RGER.pdf
- Description:
- IC LED DRIVER LINEAR NO 24VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,395
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Product details
Overview
TLC6948RGER from Texas Instruments is a 16-channel constant-current-sink LED driver with 48-line multiplexing support, 16-bit (65,536-step) grayscale PWM control per channel, ±1% typical channel-to-channel current matching, and 0.3–25 mA programmable sink current per output. It targets high-density, fine-pitch LED video panels requiring ghosting removal, caterpillar elimination, and low-grayscale uniformity.
For engineers reviewing the TLC6948RGER datasheet, TLC6948RGER pinout, TLC6948RGER application, or TLC6948RGER equivalent, key selection criteria include its 24-Kbit internal SRAM for 48-multiplexing, dual-edge GCLK operation up to 25 MHz input (50 MHz effective), IREF-based current programming, and integrated LED-open detection (LOD) with serial readback capability.
Technical Context
The TLC6948RGER implements two independent 16-bit × 16-channel × 48-line SRAM banks (BANK A/B) enabling seamless frame buffering-while one bank displays, the other accepts new grayscale data. Its enhanced spectrum PWM decoder eliminates low-grayscale coupling artifacts via synchronized timing control and pre-charge logic.
It uses a single external resistor on IREF to set maximum sink current across all 16 outputs, modulated by 7-bit global brightness control (BC) with 128 gain steps. Diagnostics include LOD threshold selection (0.12–1.28 V), IREF short protection (0.15–0.4 V thresholds), and thermal shutdown at 170°C with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 3 V to 5.5 V - supports direct interface with 3.3 V or 5 V logic and LED supply rails |
| Output Current Range | 0.3 mA to 25 mA per channel - set by IREF resistor (1.02 kΩ–10.7 kΩ) and BC register |
| Grayscale Resolution | 16-bit (65,536 steps) per channel - enables smooth dimming and high-fidelity color depth in RGB LED matrices |
| Multiplexing Support | Up to 48-line - enabled by 24-Kbit internal SRAM, reducing host processor bandwidth demand |
| Max Clock Frequencies | SCLK: 33 MHz; GCLK: 33 MHz (single-edge) or 25 MHz (dual-edge, 50 MHz effective) - enables high-refresh-rate video (≥3840 Hz @ 48×) |
| Knee Voltage | 0.3 V typical at 10 mA - minimizes voltage headroom loss, allowing higher LED string count per supply rail |
| LOD Detection | Configurable threshold (0.12–1.28 V) - identifies open-circuit LEDs without external sensing components |
Pinout & Package
Package: 24-pin VQFN (RGE) with 4.00 mm × 4.00 mm body and exposed thermal pad internally connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GCLK (Pin 20) | Grayscale clock input | Drives internal PWM counter; supports dual-edge mode for doubled effective frequency and reduced EMI |
| LAT (Pin 1) | Data latch input | Falling edge transfers shift-register data into GS memory or function registers; critical for frame synchronization |
| SCLK (Pin 24) | Serial clock input | Rising edge shifts 16-bit data from SIN into internal shift register; max 33 MHz rate enables fast configuration |
| SIN (Pin 23) | Serial data input | Accepts grayscale, BC, or command data; LSB-first protocol compatible with standard SPI masters |
| SOUT (Pin 19) | Serial data output | Shifts out LOD status, FC register reads, or diagnostic data; enables daisy-chaining multiple TLC6948 devices |
| IREF (Pin 21) | Current reference input | Connects to external resistor to GND; sets full-scale sink current; short-protection triggers below 0.15 V |
| OUT0–OUT15 (Pins 2–9, 11–18) | Constant-current sink outputs | 16 individually PWM-controlled channels; each drives one LED cathode; supports parallel connection for higher current |
| VCC (Pin 22) | Power supply | Supplies logic and analog circuitry; decoupling required near pin due to high-speed switching currents |
| GND (Pin 10) | Ground reference | Primary return path; thermal pad must be soldered to PCB ground plane for thermal performance and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| 48-line multiplexing with 24-Kbit SRAM | Reduces host update bandwidth by 3× vs 16-line drivers; enables flicker-free 3840 Hz refresh at 80×80 resolution |
| Enhanced spectrum PWM decoding | Eliminates caterpillar effect and ghosting in low-grayscale regions via optimized pulse distribution and pre-charge timing |
| Integrated LED-open detection (LOD) | Identifies failed LEDs in real time; error flags readable via SOUT without adding external comparators or ADCs |
| Smart power-save mode | Reduces total ICC to 1 mA typical when all outputs are off-critical for standby power compliance in commercial signage |
| Dual-edge GCLK operation | Enables 50 MHz effective grayscale clock using only 25 MHz external crystal-lowers EMI and simplifies clock sourcing |
Applications
| LED Video Wall Panels | High-Density Indoor Signage |
|---|---|
|
Use Scenario: 1.25 mm pitch RGB LED modules in 4K-resolution outdoor/indoor video walls requiring >3000 Hz refresh and zero visible artifacts. IC Role / Device Role / Timing Role: Constant-current sink driver with 48-line multiplexing and dual-edge GCLK to sustain 3840 Hz frame rate while maintaining 16-bit grayscale fidelity. Use Value: Eliminates caterpillar and ghosting at 1–5% grayscale levels, enabling accurate HDR content reproduction without post-processing compensation. |
Use Scenario: Compact indoor retail signage with 2.5 mm pitch SMD2121 LEDs operating at ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Thermal-aware LED driver with 170°C shutdown and ±1% current matching across 16 channels per IC. Use Value: Maintains consistent brightness and color point across large arrays despite localized heating, reducing field calibration labor by >40%. |
| Stage Lighting Pixel Controllers | Transportation Display Modules |
|
Use Scenario: DMX-controlled architectural lighting fixtures with individually addressable RGBW pixel strings requiring flicker-free dimming down to 0.1%. IC Role / Device Role / Timing Role: High-resolution PWM engine with 65,536-step grayscale and smart power-save mode for zero-current standby. Use Value: Achieves true 16-bit dimming linearity without gamma correction, meeting theatrical lighting standards (CIE 1931 Δu'v' < 0.003). |
Use Scenario: Railcar destination displays using 10 mm through-hole LEDs in harsh vibration environments with wide temperature cycling (−40°C to +85°C). IC Role / Device Role / Timing Role: Robust LED driver with IREF short protection and LOD diagnostics to detect broken LED bonds before failure escalates. Use Value: Reduces unscheduled maintenance by enabling predictive fault reporting via serial interface-no manual visual inspection required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC6946RGER | 24-pin VQFN, identical pinout and interface, but supports only 32-line multiplexing (16-Kbit SRAM) and lacks 48-line capability | Lower-resolution LED panels (<1920×1080) or cost-sensitive designs where 48-line headroom is unnecessary | Select TLC6946RGER when display height ≤32 rows or when BOM cost reduction outweighs future scalability needs |
| MAX7219CWG+ | 8-bit serial LED driver with 8×8 matrix support, no multiplexing flexibility, fixed 150 µA–40 mA range, no LOD or dual-edge clock | Simple 7-segment or dot-matrix displays-not suitable for fine-pitch video or grayscale-critical applications | Choose MAX7219CWG+ only for legacy 8×8 indicator panels; not a functional substitute for TLC6948RGER's 48-line, 16-bit video requirements |
Compared with TLC6946RGER, the TLC6948RGER delivers 50% more multiplexing lines and 50% larger display memory-enabling higher vertical resolution without increasing controller complexity. Against MAX7219CWG+, it provides 256× finer grayscale control, integrated diagnostics, and scalable architecture for modern LED video systems.
Availability
TLC6948RGER is available at Aetrix Electronics and suitable for LED video wall panels, high-density indoor signage, stage lighting pixel controllers, and transportation display modules requiring stable component supply and long-term production continuity.
Supply support for TLC6948RGER 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 high-reliability ICs for industrial, automotive, and consumer applications.
The TLC6948RGER belongs to TI's TLC69xx family of high-performance LED drivers, engineered specifically for fine-pitch, high-refresh-rate LED video applications demanding artifact-free grayscale rendering and robust system-level diagnostics.
FAQ
What is the maximum number of LED lines supported by the TLC6948RGER?
The TLC6948RGER supports up to 48-line multiplexing, enabled by its 24-Kbit internal SRAM organized as two 16-bit × 16-channel × 48-line banks. This allows simultaneous display and data loading for high-refresh-rate LED video walls without host processor bottlenecks. The TLC6948RGER achieves this without external memory, unlike lower-density alternatives.
How does the TLC6948RGER implement LED-open detection (LOD)?
The TLC6948RGER monitors voltage at each OUTn pin during active drive periods and compares it against four programmable thresholds (0.12 V, 0.5 V, 0.9 V, or 1.28 V). When an open LED causes the output voltage to exceed the selected threshold, the corresponding bit in the LOD register is set. These results are readable via the SOUT pin after issuing a READLOD command, enabling automated fault reporting in the TLC6948RGER system.
Can the TLC6948RGER operate with a 25 MHz external GCLK in dual-edge mode?
Yes-the TLC6948RGER supports dual-edge GCLK operation when the GCLK_EDGE bit in the function control register is set to 1. With a 25 MHz external clock applied to GCLK, the internal PWM counter advances on both rising and falling edges, achieving an effective 50 MHz grayscale clock rate. This doubles timing resolution without increasing EMI or requiring higher-frequency crystals, a key capability of the TLC6948RGER.
What is the purpose of the thermal pad on the TLC6948RGER VQFN package?
The exposed thermal pad on the TLC6948RGER's RGE package is internally connected to GND and must be soldered to a dedicated PCB ground plane. It reduces junction-to-board thermal resistance to 15.2°C/W, enabling reliable operation at 125°C junction temperature under full 25 mA/channel load. Omitting thermal pad connection risks thermal shutdown activation and current derating in the TLC6948RGER.
How is output current programmed on the TLC6948RGER?
Output current on the TLC6948RGER is set by an external resistor (RIREF) between the IREF pin and GND, establishing a reference voltage of ~0.8 V. The resulting current is scaled by the 7-bit global brightness control (BC) register (128 steps) and applied uniformly across all 16 channels. For example, with RIREF = 1.27 kΩ and BC = 36h (default), each channel delivers 10 mA typical-precisely defined in the TLC6948RGER datasheet Table 2.
TLC6948RGER Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- Constant Current
- Internal Switch(s):
- Yes
- Number of Outputs:
- 16
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 0V ~ 5.5V
- Current - Output / Channel:
- -
- Frequency:
- -
- Dimming:
- No
- Applications:
- LED Lighting
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-VQFN (4x4)
TLC6948RGER FAQ
1.How can I place an order for TLC6948RGER through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC6948RGER 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 TLC6948RGER reliable?
The price and inventory of TLC6948RGER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC6948RGER is usually 5 days.
3.What payment methods are accepted for TLC6948RGER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC6948RGER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC6948RGER?
TLC6948RGER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC6948RGER 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 TLC6948RGER?
For technical support, including TLC6948RGER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC6948RGER requirements.
6.How does Aetrix verify that TLC6948RGER is sourced from the original manufacturer or authorized distributors?
All TLC6948RGER 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 TLC6948RGER meets industry standards.
7.What is the process for return or replacement of TLC6948RGER?
All TLC6948RGER units undergo pre-shipment inspection (PSI). If there is an issue with TLC6948RGER, 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 TLC6948RGER part is unused and in its original packaging.
Return procedure for TLC6948RGER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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