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Texas Instruments TLC5941PWP
- Part No.:
- TLC5941PWP
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TLC5941PWP.pdf
- Description:
- IC LED DRVR LINEAR 80MA 28HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,625
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Product details
Overview
TLC5941PWP 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), and LED open detection. It operates from 3.0 V to 5.5 V supply, supports up to 80 mA per channel, and drives LEDs with output voltage capability up to 17 V - used in full-color LED signage and display back-lighting systems.
For engineers reviewing the TLC5941PWP datasheet, TLC5941PWP pinout, TLC5941PWP application, or TLC5941PWP equivalent, key selection criteria include its serial interface timing (30 MHz SCLK/GSCLK), thermal error flag (TEF) threshold at 150°C, IREF-based current programming, BLANK-controlled global output disable, and cascading support via SOUT→SIN daisy-chain.
Technical Context
The TLC5941PWP implements dual-mode serial programming: MODE = GND enables 192-bit grayscale (GS) register loading; MODE = VCC selects 96-bit dot correction (DC) register loading. Each channel's current is set by an external resistor on IREF (VIREF = 1.24 V, gain = 31.5×), enabling precise per-channel brightness calibration across temperature and LED variance.
It integrates two independent error reporting circuits: LED Open Detection (LOD) triggers when OUTn voltage falls below 0.3–0.4 V under active drive, and Thermal Error Flag (TEF) asserts at junction temperature ≥150°C. Both errors drive the open-drain XERR pin low and are latched into a status register readable via SOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output channels | 16 constant-current sink outputs (OUT0–OUT15), each programmable 0–80 mA |
| Grayscale resolution | 12-bit (4096-step) PWM control per channel - enables smooth brightness gradation in video-grade LED displays |
| Dot correction | 6-bit (64-step) per-channel current scaling - corrects inter-LED and inter-channel luminance mismatch |
| Serial interface speed | 30 MHz SCLK and GSCLK - supports high-refresh-rate displays with minimal data latency |
| Supply voltage range | VCC = 3.0 V to 5.5 V - compatible with standard logic-level microcontrollers and industrial 3.3/5 V rails |
| Output voltage headroom | OUTn supports up to 17 V - allows direct driving of multi-LED strings without external boost circuitry |
| Thermal protection | TEF trips at TJ ≥150°C - prevents thermal runaway during sustained high-current operation |
Pinout & Package
Package: 28-pin HTSSOP PowerPAD™ (PWP) with exposed thermal pad - optimized for high-power LED driver thermal dissipation (31.58°C/W with soldered PowerPAD).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT0–OUT15 | Constant-current sink output | 16 individually controlled LED cathode drivers; each sinks up to 80 mA with ±4% channel-to-channel matching |
| SIN / SOUT | Serial data input / output | SIN accepts 96- or 192-bit shift data; SOUT enables daisy-chaining and status readback (LOD/TEF bits) |
| SCLK / GSCLK | Serial clock / grayscale clock | SCLK clocks data into shift register; GSCLK drives internal PWM counter - both support 30 MHz operation |
| XLAT | Latch control | Level-triggered signal that transfers data from shift register to GS or DC register - must be stable during SCLK transitions |
| BLANK | Global output enable/disable | Active-high signal forces all OUTn OFF and resets grayscale counter - used for flicker-free frame blanking |
| IREF | Current reference input | Connect external resistor to GND to set max channel current: IOUT = 31.5 × (1.24 V / RIREF) |
| XERR | Open-drain error flag | Drives low on LOD or TEF detection - supports wired-OR fault bus with multiple TLC5941 devices |
| MODE | Operating mode select | GND = GS mode (192-bit); VCC = DC mode (96-bit) - determines shift register length and latch target register |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel dot correction | 6-bit independent scaling (0–100% of Imax) corrects LED binning and aging drift across 16 outputs |
| Grayscale PWM precision | 12-bit linear PWM with <±4% load regulation ensures consistent brightness across varying LED forward voltages |
| Integrated error diagnostics | Hardware LOD and TEF detection with latched status bits - eliminates need for external sense resistors or thermal sensors |
| Controlled in-rush current | 20 ns graduated delay between OUT0–OUT15 - reduces peak supply current and bypass capacitor stress during turn-on |
| Cascadable serial interface | SOUT-to-SIN daisy-chain supports unlimited channel expansion with single controller interface and shared clocks |
Applications
| Monochrome LED Signage | Full-Color Video Wall |
|---|---|
|
Use Scenario: Outdoor advertising panels using discrete red/green/blue LED modules with variable ambient lighting. IC Role / Device Role / Timing Role: TLC5941PWP acts as channel-matched constant-current sink driver with per-pixel grayscale and dot correction for uniform luminance. Use Value: 12-bit grayscale enables >4000 brightness levels per color; 6-bit dot correction compensates for LED batch variation and thermal drift over 10,000+ hours. |
Use Scenario: Indoor high-resolution LED video wall with tight pixel pitch and real-time video processing. IC Role / Device Role / Timing Role: TLC5941PWP provides synchronized PWM dimming across 16 pixels per IC, driven by FPGA-generated GSCLK/SCLK at 30 MHz. Use Value: 30 MHz serial interface sustains 120 Hz refresh at 1920×1080 resolution; BLANK pin enables zero-flicker frame synchronization. |
| Automotive Interior Lighting | Industrial Display Backlighting |
|
Use Scenario: RGB ambient lighting in vehicle cabins requiring EMI-robust, thermally stable dimming. IC Role / Device Role / Timing Role: TLC5941PWP delivers calibrated current to each LED string while monitoring open-circuit faults and junction temperature. Use Value: TEF flag triggers graceful dimming rollback before thermal shutdown; LOD detection reports failed LEDs for predictive maintenance. |
Use Scenario: Medical and industrial HMIs with high-brightness LCD backlights needing precise luminance uniformity. IC Role / Device Role / Timing Role: TLC5941PWP drives white LED strings with IREF-set current and dot correction to match panel edge-to-center intensity gradients. Use Value: 6-bit dot correction adjusts individual channel current to compensate for optical path losses; 17 V output headroom supports 5-LED series strings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5947PWR | 24-channel, same 12-bit GS/6-bit DC architecture, but QFN-32 package; no PowerPAD thermal enhancement | Higher channel density per IC, but lower thermal performance (35.9°C/W vs. 31.58°C/W) limits sustained 80 mA operation | Select TLC5947PWR only when board space constraints favor 24-channel integration and average current ≤60 mA/channel |
| MAX6966AUG+ | 16-channel, 8-bit GS + 6-bit DC, 25 mA max per channel, I²C interface instead of SPI-like serial | Lacks 12-bit grayscale depth and 80 mA drive - unsuitable for high-brightness signage or video walls | Choose MAX6966AUG+ only for low-power indicator applications where I²C compatibility and smaller footprint outweigh grayscale fidelity needs |
Compared with TLC5941PWP, TLC5947PWR offers higher integration but reduced thermal margin, while MAX6966AUG+ trades resolution and drive strength for I²C simplicity - neither matches TLC5941PWP's combination of 12-bit fidelity, 80 mA per channel, and PowerPAD-enabled thermal reliability in demanding LED signage designs.
Availability
TLC5941PWP is available at Aetrix Electronics and suitable for monochrome signage, full-color video walls, automotive interior lighting, industrial display backlighting, and medical HMI applications requiring stable component supply and long-term production continuity.
Supply support for TLC5941PWP 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 power management solutions with broad industrial and automotive qualification.
The TLC5941 product line was designed specifically for high-fidelity, high-reliability LED display systems - emphasizing per-channel current accuracy, integrated diagnostics, and thermal robustness in continuous-duty applications.
FAQ
What is the maximum output current per channel for the TLC5941PWP?
The TLC5941PWP supports a maximum constant-current output of 80 mA per channel (OUT0–OUT15), set by an external resistor on the IREF pin using the formula IOUT = 31.5 × (1.24 V / RIREF). The device maintains ±4% channel-to-channel current matching across temperature and supply variations, ensuring consistent LED brightness in the TLC5941PWP-based design.
How does the TLC5941PWP implement dot correction and grayscale control?
The TLC5941PWP uses two independent 6-bit dot correction (DC) registers and sixteen 12-bit grayscale (GS) registers. Dot correction scales each channel's current from 0% to 100% in 64 steps to compensate for LED variance; grayscale controls PWM duty cycle in 4096 steps for fine brightness control. Both are loaded via serial interface with MODE pin selecting DC (96-bit) or GS (192-bit) mode - a core capability of the TLC5941PWP.
What error detection features does the TLC5941PWP provide?
The TLC5941PWP integrates LED Open Detection (LOD) and Thermal Error Flag (TEF). LOD triggers when an output voltage drops below 0.3–0.4 V under active drive, indicating an open LED; TEF activates at junction temperature ≥150°C. Both errors drive the open-drain XERR pin low and are latched into a status register readable via SOUT - critical diagnostic functionality unique to the TLC5941PWP.
Can multiple TLC5941PWP devices be connected together?
Yes, the TLC5941PWP supports daisy-chaining via its SOUT-to-SIN interface. Serial data flows from one device's SOUT to the next's SIN, sharing SCLK, XLAT, BLANK, and GSCLK lines. This enables scalable LED channel expansion without additional controller pins. Cascaded TLC5941PWP configurations retain full dot correction and grayscale control per device - a key architectural advantage of the TLC5941PWP.
What is the role of the BLANK pin on the TLC5941PWP?
The BLANK pin is an active-high global output disable signal. When asserted, it forces all 16 OUTn channels OFF and resets the internal grayscale counter - enabling flicker-free frame blanking in video applications. Unlike software-based blanking, BLANK operates at hardware level with sub-300 ns response, making it essential for precise timing control in the TLC5941PWP's display system implementation.
TLC5941PWP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- 28-HTSSOP
TLC5941PWP FAQ
1.How can I place an order for TLC5941PWP through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5941PWP 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 TLC5941PWP reliable?
The price and inventory of TLC5941PWP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5941PWP is usually 5 days.
3.What payment methods are accepted for TLC5941PWP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5941PWP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5941PWP?
TLC5941PWP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5941PWP 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 TLC5941PWP?
For technical support, including TLC5941PWP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5941PWP requirements.
6.How does Aetrix verify that TLC5941PWP is sourced from the original manufacturer or authorized distributors?
All TLC5941PWP 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 TLC5941PWP meets industry standards.
7.What is the process for return or replacement of TLC5941PWP?
All TLC5941PWP units undergo pre-shipment inspection (PSI). If there is an issue with TLC5941PWP, 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 TLC5941PWP part is unused and in its original packaging.
Return procedure for TLC5941PWP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLC5941PWP Tags
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BCR430UXTSA2
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BCR420UE6433HTMA1
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BCR420UE6327HTSA1
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BCR421UE6327HTSA1
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HV9910CLG-G
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BCR420UW6-7
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BCR421UW6-7
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BCR420UFD-7
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BCR421UFD-7
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