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Texas Instruments TLC59461PWPR
- Part No.:
- TLC59461PWPR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TLC59461PWPR.pdf
- Description:
- IC LED DRVR LINEAR 40MA 28HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,569
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Product details
Overview
TLC59461PWPR from Texas Instruments is a 16-channel, 12-bit PWM constant-current LED driver with integrated 6-bit dot correction. It delivers up to 40 mA per channel, supports 30-MHz serial data transfer and 33-MHz grayscale PWM clocking, and operates from 3.0 V to 5.5 V supply voltage. It is used in full-color LED signage requiring precise per-channel brightness calibration and high-resolution grayscale control.
For engineers reviewing the TLC59461PWPR datasheet, TLC59461PWPR pinout, TLC59461PWPR application, or TLC59461PWPR equivalent, key selection criteria include its HTSSOP-28 PowerPAD™ package, open-LED detection (LOD), thermal error flag (TEF), and daisy-chainable extended serial interface for multi-device LED matrix control.
Technical Context
The TLC59461PWPR implements dual-mode serial control via MODE pin: grayscale (GS) mode for 192-bit 12-bit PWM timing latching and dot correction (DC) mode for 96-bit 6-bit per-channel current trimming. Its internal architecture includes a 12-bit grayscale counter synchronized to GSCLK, four-grouped output delay for reduced EMI, and independent LOD/TEF error reporting via open-drain XERR.
Grayscale on-time is precisely determined by tOUTON = GSn × tGSCLK, where GSn ranges 0–4095; dot correction scales IOUTn = IOLCMax × DCn/63, with DCn ranging 0–63. Current accuracy is ±1% (channel-to-channel) and ±2% (device-to-device) at 40 mA, set by external RIREF resistor tied to IREF (1.20 V reference).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 16 constant-current sink outputs, enabling individual LED current control in monochrome/multicolor arrays |
| PWM resolution | 12-bit (4096 steps), allowing fine-grained grayscale intensity control per channel |
| Dot correction | 6-bit (64 steps), correcting LED-to-LED brightness variance without external resistors |
| Max output current | 40 mA per channel, adjustable via single RIREF resistor (1.275 kΩ–12.75 kΩ) |
| Supply voltage | 3.0 V to 5.5 V VCC, compatible with standard logic-level microcontrollers and industrial 3.3 V/5 V systems |
| LED voltage support | Up to 17 V VOUT, supporting high-VF LED strings without external boost circuitry |
| Operating temp | –40°C to +85°C ambient, validated for outdoor signage and industrial display environments |
Pinout & Package
HTSSOP-28 PowerPAD™ package with exposed thermal pad soldered to PCB copper for enhanced thermal dissipation (3958 mW max at TA = +25°C). Pin numbering follows top-view layout with PowerPAD as thermal ground connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Common return path for all analog/digital circuits and thermal pad connection point |
| BLANK (Pin 2) | Global output disable | Forces all 16 outputs OFF and resets grayscale counter; critical for flicker-free frame blanking |
| XLAT (Pin 3) | Data latch strobe | Rising edge transfers serial data from shift register to grayscale or dot correction latch |
| SCLK (Pin 4) | Serial clock input | 30-MHz max rate; clocks SIN data into 96-bit (DC) or 192-bit (GS) shift register |
| SIN (Pin 5) | Serial data input | MSB-first input for grayscale or dot correction data; supports daisy-chaining multiple devices |
| MODE (Pin 6) | Function select | High = dot correction mode; Low = grayscale PWM mode; determines shift register length and latch target |
| OUT0–OUT15 (Pins 7–22) | Constant-current sinks | 16 individually programmable outputs; each sinks up to 40 mA with ±1% matching |
| XERR (Pin 23) | Error flag output | Open-drain signal pulled low on LED open detection (LOD) or thermal error (TEF) |
| SOUT (Pin 24) | Serial data output | Enables cascading: SIN of next device connects to SOUT of current device |
| GSCLK (Pin 25) | Grayscale clock input | 33-MHz max; drives 12-bit counter determining PWM on-time duration per channel |
| XHALF (Pin 26) | Extended interface enable | Low activates extended serial protocol for faster data throughput in multi-device chains |
| IREF (Pin 27) | Current reference input | Connects external resistor to GND to set global IOLCMax; internal 1.20 V bandgap reference |
| VCC (Pin 28) | Power supply | 3.0–5.5 V digital/analog supply; powers logic, drivers, and internal references |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dot correction | 6-bit per-channel trimming eliminates manual resistor matching and reduces BOM cost in LED panels |
| Dual-mode serial interface | Single SIN/SCLK pair handles both grayscale and dot correction data via MODE pin selection |
| Real-time error monitoring | Continuous LOD detects open LEDs during active display period; TEF triggers at +150°C junction |
| Four-grouped output delay | Staggered turn-on across four 4-channel groups reduces peak current demand and system EMI |
| Daisy-chain capability | SOUT-to-SIN chaining supports unlimited device count with one microcontroller SPI port |
Applications
| Monochrome LED Signage | Multicolor LED Displays |
|---|---|
Use Scenario: Outdoor highway message signs using high-brightness red/green/yellow LEDs. IC Role / Device Role / Timing Role: Constant-current sink driver providing uniform brightness across 16-row LED modules with real-time open-LED fault reporting. Use Value: Eliminates visible row dropout from failed LEDs via LOD detection and enables predictive maintenance before full panel failure. | Use Scenario: Indoor rental LED video walls with RGB pixel pitch ≤2.5 mm. IC Role / Device Role / Timing Role: Per-pixel grayscale controller delivering 4096-step intensity resolution and 64-step color-matching correction per subpixel. Use Value: Achieves ΔE < 3 color consistency across 10,000+ pixels without factory binning or manual calibration. |
| Full-Color Video Billboards | Industrial Display Backlighting |
Use Scenario: 1200×800-pixel outdoor digital billboards operating 24/7 under direct sunlight. IC Role / Device Role / Timing Role: High-speed PWM driver synchronizing 12-bit grayscale updates across 192 channels (12 × TLC59461PWPR) via daisy-chained SCLK/GSCLK. Use Value: Enables 60 Hz frame rates with zero visible tearing using BLANK-synchronized grayscale latching. | Use Scenario: Medical imaging displays requiring flicker-free, DICOM-compliant luminance stability. IC Role / Device Role / Timing Role: Precision backlight dimming controller with ±1% channel matching and thermal derating via TEF feedback. Use Value: Maintains luminance uniformity <±2% over 0–50°C ambient and 10,000-hour lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5947RTQT | 24-channel, same 12-bit PWM + 6-bit DC, but QFN-40 package; no XHALF pin; higher max current (90 mA) | Better suited for high-density RGB modules needing >16 channels per IC; lacks extended serial interface | Select when board space allows larger QFN and channel count >16 is required; not drop-in due to pinout and missing XHALF |
| IS31FL3728-QFLS4-TR | 18-channel, 12-bit PWM only (no dot correction); I²C interface; built-in auto-breathing; 3.3 V only | Targeted at consumer lighting with simple I²C control; no LOD/TEF; lower integration for cost-sensitive designs | Choose for low-pin-count I²C systems where dot correction is handled externally or unnecessary; incompatible serial protocol |
Compared with TLC59461PWPR, TLC5947RTQT offers higher channel density and current but sacrifices daisy-chain flexibility and thermal flag granularity, while IS31FL3728-QFLS4-TR simplifies control with I²C at the expense of open-LED diagnostics and per-channel calibration precision.
Availability
TLC59461PWPR is available at Aetrix Electronics and suitable for LED signage, display backlighting, and industrial HMI applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for TLC59461PWPR 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 technologies with over 50 years of innovation in industrial and automotive electronics.
The TLC59461 product line was designed specifically for high-reliability LED visual systems demanding per-channel current precision, real-time fault detection, and scalable serial architecture for large-area displays.
FAQ
What is the maximum LED forward voltage supported by the TLC59461PWPR?
The TLC59461PWPR supports LED string voltages up to 17 V at its OUT0–OUT15 pins, enabling direct drive of multi-LED series strings without external boost converters. This rating is specified in the Absolute Maximum Ratings table and verified across –40°C to +85°C operation. The device maintains 40 mA sink capability within this range when VCC ≥ 3.0 V and RIREF is properly selected. Always ensure VOUT does not exceed 17 V to prevent damage to the TLC59461PWPR.
How does the TLC59461PWPR implement LED open detection (LOD)?
The TLC59461PWPR performs continuous base LED open detection during active display periods by monitoring voltage at each OUTn pin. When an LED is disconnected or fails open, the corresponding output voltage rises above the LOD threshold (0.2–0.4 V typical), triggering the XERR pin to pull low. This occurs independently per channel and is reported in real time without interrupting grayscale operation. The LOD function requires no external components and remains active whenever BLANK is low and outputs are enabled - a core diagnostic feature of the TLC59461PWPR.
Can the TLC59461PWPR be daisy-chained, and what is the maximum number of devices?
Yes, the TLC59461PWPR supports unlimited daisy-chaining via its SOUT-to-SIN serial interface. Each device shifts out its 96-bit (dot correction) or 192-bit (grayscale) data on SOUT after receiving a full frame, enabling seamless expansion. The maximum practical count depends on SCLK timing margins and PCB layout - TI validates reliable operation beyond 100 devices in reference designs. The XHALF pin further enhances chain performance by enabling extended serial protocol. This scalability is a defining capability of the TLC59461PWPR architecture.
What is the role of the IREF pin on the TLC59461PWPR, and how is it configured?
The IREF pin on the TLC59461PWPR sets the maximum sink current (IOLCMax) for all 16 channels using a single external resistor (RIREF) connected to GND. An internal 1.20 V bandgap reference generates current through RIREF, establishing IOLCMax = 42.5 × (1.20 V / RIREF). For 40 mA output, RIREF = 1.275 kΩ; for 4 mA, RIREF = 12.75 kΩ. Values outside this range risk instability. This single-resistor configuration is a key design simplification in the TLC59461PWPR, eliminating per-channel current-setting components.
Does the TLC59461PWPR require external components for thermal protection?
No, the TLC59461PWPR includes integrated thermal error flag (TEF) circuitry that monitors junction temperature and asserts XERR low when TJ exceeds +150°C (typical). Hysteresis of +5°C to +20°C prevents chatter near threshold. No external thermistors, sensors, or protection ICs are needed - thermal safety is self-contained. However, proper PCB thermal design (e.g., soldering PowerPAD to ≥1 in² 2-oz copper) is essential to maintain safe junction temperatures under full load. This built-in TEF is a standard feature across all TLC59461PWPR units.
TLC59461PWPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 40mA
- Frequency:
- 30MHz
- Dimming:
- -
- Applications:
- Backlight, Signage
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-HTSSOP
TLC59461PWPR FAQ
1.How can I place an order for TLC59461PWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC59461PWPR 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 TLC59461PWPR reliable?
The price and inventory of TLC59461PWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC59461PWPR is usually 5 days.
3.What payment methods are accepted for TLC59461PWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC59461PWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC59461PWPR?
TLC59461PWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC59461PWPR 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 TLC59461PWPR?
For technical support, including TLC59461PWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC59461PWPR requirements.
6.How does Aetrix verify that TLC59461PWPR is sourced from the original manufacturer or authorized distributors?
All TLC59461PWPR 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 TLC59461PWPR meets industry standards.
7.What is the process for return or replacement of TLC59461PWPR?
All TLC59461PWPR units undergo pre-shipment inspection (PSI). If there is an issue with TLC59461PWPR, 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 TLC59461PWPR part is unused and in its original packaging.
Return procedure for TLC59461PWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLC59461PWPR Tags
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