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Texas Instruments TLC5941RHBTG4
- Part No.:
- TLC5941RHBTG4
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
TLC5941RHBTG4.pdf
- Description:
- IC LED DRIVER LINEAR 80MA 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,094
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Product details
Overview
TLC5941RHBTG4 from Texas Instruments is a 16-channel constant-current LED driver IC with integrated 12-bit grayscale PWM control (4096 steps), 6-bit dot correction (64 steps), LED open detection, and thermal error flag. It operates from 3.0 V to 5.5 V supply and supports up to 80 mA per channel with external IREF resistor programming. Used in high-precision LED signage and full-color display back-lighting systems.
For engineers reviewing the TLC5941RHBTG4 datasheet, TLC5941RHBTG4 pinout, TLC5941RHBTG4 application, or TLC5941RHBTG4 equivalent, key selection criteria include its 32-pin QFN package, 30 MHz serial data rate, GSCLK/BLANK timing constraints, open-drain XERR error reporting, and dual-mode MODE pin configuration for grayscale vs. dot correction register loading.
Technical Context
The TLC5941RHBTG4 implements a dual-register architecture: 192-bit grayscale (GS) register for per-channel 12-bit PWM brightness control and 96-bit dot correction (DC) register for per-channel 6-bit current scaling. Grayscale operation uses a synchronous counter driven by GSCLK, while dot correction adjusts sink current linearly via DCn × Imax / 63.
It features cascaded serial interface (SIN → SOUT) supporting daisy-chained configurations, level-triggered XLAT latching, and open-drain XERR output that asserts low on either LED open detection (VOUT < 0.3 V under drive) or thermal error (TJ > 150 °C). BLANK forces all outputs OFF and resets GS counter.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 16 independent constant-current sink outputs (OUT0–OUT15) |
| Grayscale resolution | 12-bit (4096 steps) PWM control per channel - enables smooth brightness gradation in video-grade LED displays |
| Dot correction | 6-bit (64 steps) per channel - compensates for LED-to-LED forward voltage and aging variations |
| Max output current | 80 mA per channel (set via external IREF resistor; Imax = 31.5 × VIREF/RIREF) |
| Supply voltage | 3.0 V to 5.5 V - compatible with standard logic-level microcontrollers and industrial 3.3 V/5 V rails |
| Data rate | 30 MHz SCLK - supports fast update of full 192-bit GS or 96-bit DC register in ≤6.4 µs |
| Error detection | Integrated LOD (LED open) and TEF (thermal error) - reported jointly on open-drain XERR pin with status bit readback via SOUT |
Pinout & Package
Package: 32-pin 5 mm × 5 mm QFN (RHB) with exposed thermal pad; RoHS-compliant, moisture-sensitive level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT0–OUT15 | Constant-current sink outputs | Drive LEDs cathode-side; each independently programmable for grayscale and dot correction |
| SIN | Serial data input | MSB-first 96-bit (DC mode) or 192-bit (GS mode) shift register input; CMOS-compatible |
| SOUT | Serial data output | Shifts out status bits (LOD/TEF flags) or cascades to next device's SIN; open-drain, requires pull-up |
| SCLK | Serial clock input | Edge-triggered clock (≤30 MHz); rising edge shifts data into internal register |
| XLAT | Latch control input | Level-triggered; high pulse transfers data from shift register to GS or DC latch |
| MODE | Operating mode select | GND = GS mode (192-bit); VCC = DC mode (96-bit); must be stable during XLAT transition |
| BLANK | Global output disable | Active-high; forces all OUTn OFF and resets grayscale counter - used for flicker-free frame blanking |
| GSCLK | Grayscale PWM clock | Drives internal 12-bit counter; frequency sets PWM period (e.g., 1 MHz → 4.096 ms full cycle) |
| IREF | Current reference input | Connects to GND via external resistor; sets Imax = 31.5 × 1.24 V / RIREF |
| XERR | Error flag output | Open-drain; pulls low on LOD or TEF; multiple devices can share single pull-up and MCU interrupt line |
| VCC, GND | Power supply | 3.0–5.5 V digital supply; thermal pad must be soldered for rated 35.9 °C/W θJA |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel grayscale control | 12-bit (4096-step) PWM enables precise luminance matching across multi-color LED arrays |
| Channel-specific current trimming | 6-bit dot correction allows ±12.5% fine-tuning of each output's Imax to compensate for LED binning |
| Real-time fault monitoring | LOD detects open-circuit LEDs at each OUTn; TEF triggers at 150 °C junction temperature - both reported on XERR |
| Daisy-chain capability | SOUT-to-SIN cascading supports unlimited channel expansion without additional MCU GPIOs |
| Controlled turn-on sequencing | Graduated 20 ns inter-channel delay (max 300 ns across 16 channels) limits inrush current and reduces PCB bypass capacitance |
Applications
| Indoor Full-Color LED Video Walls | Automotive Interior Ambient Lighting |
|---|---|
Use Scenario: High-resolution indoor video walls using RGB SMD LEDs with tight brightness uniformity requirements. IC Role / Device Role / Timing Role: TLC5941RHBTG4 acts as the per-pixel constant-current driver, executing synchronized grayscale PWM and per-LED dot correction under MCU command. Use Value: 12-bit grayscale eliminates contouring artifacts; 6-bit dot correction corrects for LED VF spread across batches, achieving <±3% luminance uniformity across 10,000+ pixels. | Use Scenario: Dynamic ambient lighting in automotive cabins with individually addressable LED zones (footwell, door panels, dashboard). IC Role / Device Role / Timing Role: TLC5941RHBTG4 drives 16-zone LED strings, accepting CAN/FlexRay-gated SPI commands via MCU and responding to BLANK for synchronized dimming transitions. Use Value: Thermal error flag prevents overheating in enclosed spaces; open-drain XERR enables single-wire fault reporting across multiple driver ICs to central body controller. |
| Industrial Panel Display Backlighting | Stage & Event Lighting Fixtures |
Use Scenario: High-brightness TFT-LCD backlights requiring flicker-free, 1000+ nits output with local dimming zones. IC Role / Device Role / Timing Role: TLC5941RHBTG4 controls 16 backlight LED strings in local dimming zones, updated via high-speed SPI during vertical blanking intervals. Use Value: 30 MHz SCLK ensures full register reload in <6.5 µs - faster than typical 16.7 ms frame time - enabling real-time dynamic contrast enhancement. | Use Scenario: DMX512-controlled moving head lights with RGBW LED engines requiring precise color mixing and thermal derating. IC Role / Device Role / Timing Role: TLC5941RHBTG4 serves as the final-stage LED current controller, receiving intensity data from DMX decoder MCU and applying per-channel dot correction for consistent white point. Use Value: LED open detection identifies failed emitters before thermal runaway; BLANK pin enables strobe effects synchronized to music beats without software overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5947RGER | 24-channel, same 12-bit GS + 6-bit DC architecture; 32-pin QFN; higher max current (120 mA) | Supports larger LED arrays per IC; requires revised PCB layout and firmware register map | Select when >16 channels needed per node and thermal margin allows higher Imax |
| IS31FL3728-QFLS4-TR | 18-channel, 12-bit GS only (no dot correction); I²C interface; integrated oscillator; smaller 24-pin QFN | Reduces MCU GPIO count and eliminates external GSCLK source; lacks per-channel current trimming | Select for cost-sensitive, lower-precision applications where LED binning is tightly controlled |
Compared with TLC5947RGER, the TLC5941RHBTG4 offers tighter thermal management in space-constrained fixtures due to lower power density; compared with IS31FL3728-QFLS4-TR, it delivers superior brightness uniformity in production LED panels through hardware dot correction - critical where mixed-bin LEDs are unavoidable.
Availability
TLC5941RHBTG4 is available at Aetrix Electronics and suitable for indoor LED video walls, automotive ambient lighting systems, and industrial panel display back-lighting requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TLC5941RHBTG4 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 over 50 years of innovation in power management and signal chain solutions.
The TLC5941RHBTG4 belongs to TI's high-precision LED driver product line, designed specifically for applications demanding pixel-level brightness control, fault resilience, and scalable multi-channel architectures in commercial signage and professional lighting.
FAQ
What is the maximum output current per channel for the TLC5941RHBTG4?
The TLC5941RHBTG4 supports up to 80 mA per channel, set by an external resistor between IREF and GND. The relationship is Imax = 31.5 × VIREF/RIREF, where VIREF is internally regulated to 1.24 V. For example, a 640 Ω resistor yields ~61 mA typical. Operation below 5 mA is not recommended due to instability.
How does the TLC5941RHBTG4 report LED open faults?
The TLC5941RHBTG4 reports LED open detection (LOD) by pulling the open-drain XERR pin low when any OUTn output is enabled and its voltage drops below 0.3 V - indicating an open-circuit LED. LOD status bits are also latched into the internal status register and readable via SOUT after XLAT toggles, enabling precise fault localization.
Can the TLC5941RHBTG4 be used in cascaded configurations?
Yes, the TLC5941RHBTG4 supports daisy-chaining via its SOUT pin, which outputs shifted data to the SIN pin of the next device. This allows unlimited channel expansion using only three MCU lines (SCLK, SIN, XLAT). Each device retains independent GS and DC register control, and XERR pins can be wire-OR'd for consolidated fault reporting.
What is the function of the MODE pin on the TLC5941RHBTG4?
The MODE pin selects operating mode: grounded for 192-bit grayscale (GS) register loading, or pulled to VCC for 96-bit dot correction (DC) register loading. Mode changes require XLAT to be low during transition. The pin determines shift register width and destination latch, enabling separate calibration and brightness programming sequences.
Does the TLC5941RHBTG4 require external components for basic operation?
Yes, the TLC5941RHBTG4 requires at minimum: (1) an external resistor from IREF to GND to set Imax; (2) a pull-up resistor on XERR (typically 10 kΩ to VCC); (3) decoupling capacitors on VCC (≥100 nF ceramic near pin); and (4) proper thermal pad soldering for the RHB package. GSCLK and BLANK may be generated by MCU or external oscillator depending on timing needs.
TLC5941RHBTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Linear
- Topology:
- Shift Register
- Internal Switch(s):
- Yes
- Number of Outputs:
- 16
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 17V
- Current - Output / Channel:
- 80mA
- Frequency:
- -
- Dimming:
- -
- Applications:
- Backlight, Signage
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VQFN (5x5)
TLC5941RHBTG4 FAQ
1.How can I place an order for TLC5941RHBTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5941RHBTG4 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 TLC5941RHBTG4 reliable?
The price and inventory of TLC5941RHBTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5941RHBTG4 is usually 5 days.
3.What payment methods are accepted for TLC5941RHBTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5941RHBTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5941RHBTG4?
TLC5941RHBTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5941RHBTG4 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 TLC5941RHBTG4?
For technical support, including TLC5941RHBTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5941RHBTG4 requirements.
6.How does Aetrix verify that TLC5941RHBTG4 is sourced from the original manufacturer or authorized distributors?
All TLC5941RHBTG4 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 TLC5941RHBTG4 meets industry standards.
7.What is the process for return or replacement of TLC5941RHBTG4?
All TLC5941RHBTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TLC5941RHBTG4, 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 TLC5941RHBTG4 part is unused and in its original packaging.
Return procedure for TLC5941RHBTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLC5941RHBTG4 Tags
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BCR402RE6327HTSA1
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BCR430UXTSA2
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BCR420UE6433HTMA1
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BCR420UE6327HTSA1
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BCR421UE6327HTSA1
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