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Texas Instruments TLC5949PWPR
- Part No.:
- TLC5949PWPR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TLC5949PWPR.pdf
- Description:
- IC LED DRV LIN PWM 45MA 24HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,917
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Product details
Overview
TLC5949PWPR from Texas Instruments is a 16-channel, 12-bit enhanced-spectrum PWM LED driver with integrated self-diagnosis, constant-current sink outputs (2–45 mA), 7-bit global brightness control (25–100% range), and 33 MHz serial interface clock - used in high-reliability LED video displays requiring per-channel grayscale precision and real-time fault detection.
For engineers reviewing the TLC5949PWPR datasheet, TLC5949PWPR pinout, TLC5949PWPR application, or TLC5949PWPR equivalent, key selection criteria include its 16-channel constant-current sink architecture, invisible LOD/LSD/PTW/TEF error detection, four-channel grouped delay switching for inrush suppression, and HTSSOP-24 package thermal performance (θJA = 39.9°C/W).
Technical Context
The TLC5949PWPR implements dual-stage PWM control: a 12-bit grayscale counter driven by GSCLK (up to 33 MHz) for per-channel brightness, and a 7-bit global BC register adjusting all channels simultaneously within a 25–100% current range. It supports both conventional and enhanced-spectrum (ES) PWM modes via configurable ESPWM bit.
Its diagnostic architecture includes six independent flags - LED open (LOD), short (LSD), output leakage (OLD), IREF short (ISF), pre-thermal warning (PTW), and thermal error (TEF) - all readable via SOUT after LAT assertion. Error detection operates invisibly during active display timing without blanking interruption.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Channels | 16 constant-current sink outputs (OUT0–OUT15), each adjustable from 2 mA to 45 mA via IREF resistor |
| Grayscale Resolution | 12-bit (4096 steps) per channel with ES-PWM or conventional PWM; on-time error ±20 ns at 33 MHz GSCLK |
| Global Brightness Control | 7-bit (128 steps), 25–100% linear current scaling; enables uniform luminance tuning across multi-driver systems |
| Serial Interface Speed | 33 MHz SCLK and GSCLK support >1.9 Mbps data throughput; 193-bit shift register enables daisy-chained configuration |
| Diagnostic Coverage | Six real-time flags (LOD, LSD, OLD, ISF, PTW, TEF); PTW triggers at 125–150°C junction, TEF at 150–180°C with 5–20°C hysteresis |
| Thermal Performance | HTSSOP-24 package with PowerPAD; θJA = 39.9°C/W, θJCbot = 3.8°C/W - enables high-current operation with minimal PCB copper |
| Supply & Voltage Range | VCC = 3.0–3.6 V; output voltage tolerance up to +11 V; supports LED strings up to 10 V forward voltage |
Pinout & Package
Package: HTSSOP-24 (PWP), thermally enhanced with exposed PowerPAD on bottom side (pin 24 = VCC, pin 1 = GND, pin 13 = OUT8, etc.).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1) | Power ground reference | Primary return path for all sink currents and internal logic; must be low-impedance connection to minimize noise coupling |
| SIN (2) | Serial data input | LSB-first 193-bit shift register input; accepts GS, BC, and control data; compatible with 3.3 V logic |
| SCLK (3) | Data shift clock | Rising-edge triggered; clocks data into shift register and out via SOUT; max 33 MHz operation |
| LAT (4) | Data latch control | Rising edge latches shift register contents into GS or control latches; initiates diagnostic flag readout on SOUT |
| OUT0–OUT15 (5–20) | Constant-current sink outputs | Each independently PWM-controlled; supports parallel grouping for higher current; rated 60 mA absolute max |
| GSCLK (21) | Grayscale clock input | Drives 12-bit counter for PWM duty cycle; disabled during BLANK = 1; max 33 MHz, 10 ns pulse width min |
| SOUT (22) | Serial status output | MSB of shift register; outputs diagnostic flags (LOD/LSD/OLD/ISF/PTW/TEF) and status bits after LAT assertion |
| IREF (23) | Reference current terminal | Resistor-to-GND sets full-scale current (2–45 mA); shorting to GND forces outputs off and asserts ISF flag |
| VCC (24) | Positive supply | 3.0–3.6 V digital/analog supply; powers logic, drivers, and internal reference; PowerPAD connects to VCC plane |
Key Features
| Feature | Design Value |
|---|---|
| Invisible fault detection | LOD, LSD, OLD, ISF, PTW, and TEF flags sampled and reported without interrupting display timing or requiring blanking cycles |
| Four-channel grouped delay switching | Outputs divided into four groups (0–3, 4–7, 8–11, 12–15); sequential turn-on reduces inrush current by >70% vs. simultaneous activation |
| Enhanced-spectrum (ES) PWM mode | Reduces electromagnetic interference (EMI) and visible flicker by spreading PWM energy across frequency spectrum vs. conventional fixed-frequency PWM |
| Auto display repeat & refresh | Internal timing controller maintains stable grayscale output without host CPU intervention; eliminates frame tearing in static content |
| Power-save mode | Reduces VCC current to ≤40 µA by disabling GSCLK and drivers while retaining latch state; exit latency <50 µs via LAT or GS data write |
Applications
| LED Video Displays | LED Signboards |
|---|---|
Use Scenario: High-resolution indoor/outdoor video walls with >10,000 nits brightness and 60 Hz+ refresh rates. IC Role / Device Role / Timing Role: 16-channel constant-current sink driver with per-pixel grayscale control and real-time open/short detection. Use Value: Enables seamless 4096-step grayscale rendering while detecting failed LEDs before visible pixel dropout occurs. |
Use Scenario: Large-format roadside signage with wide temperature range (–40°C to +85°C) and long uptime requirements. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with pre-thermal warning (PTW) and thermal shutdown (TSD) for unattended operation. Use Value: Prevents catastrophic thermal runaway via early PTW alert at 125–150°C, allowing system-level derating before TEF triggers. |
| Architectural Lighting Systems | Industrial HMI Panels |
Use Scenario: RGBW color-mixed architectural fixtures requiring precise current matching and long-term stability. IC Role / Device Role / Timing Role: Precision sink driver with ±0.6% typical channel-to-channel current matching and ±1% device-to-device accuracy. Use Value: Maintains consistent white point and color fidelity across hundreds of daisy-chained TLC5949PWPR units over 10+ years. |
Use Scenario: Factory-floor HMIs with vibration, ESD, and ambient light challenges requiring robust LED indicators. IC Role / Device Role / Timing Role: Self-diagnosing LED driver with invisible LOD/LSD detection and 3 kV HBM ESD rating. Use Value: Eliminates manual visual inspection by reporting open-circuit LEDs via SOUT before operator notices dimming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5947PWR | 16-channel, 12-bit, no built-in diagnostics; lacks LOD/LSD/PTW/TEF flags and ES-PWM mode | Suitable for cost-sensitive, non-critical LED arrays where fault visibility is handled externally | Select when diagnostic autonomy is unnecessary and BOM cost reduction is prioritized over field reliability |
| MAX6967AUG+T | 16-channel, 12-bit, integrated thermal sensor and I²C interface; no GSCLK pin or ES-PWM capability | Better suited for microcontroller-constrained designs needing simple two-wire control instead of high-speed SPI-like daisy-chain | Choose when system uses I²C infrastructure and requires on-die temperature monitoring but not invisible error detection |
Compared with TLC5947PWR and MAX6967AUG+T, the TLC5949PWPR uniquely delivers real-time, invisible fault detection alongside ES-PWM for EMI-sensitive environments - making it optimal for mission-critical displays where undetected LED failure compromises safety or brand integrity.
Availability
TLC5949PWPR is available at Aetrix Electronics and suitable for LED video displays, outdoor signboards, architectural lighting systems, and industrial HMI panels requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for TLC5949PWPR 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and industrial-grade performance.
The TLC5949PWPR belongs to TI's high-integrity LED driver product line, engineered specifically for applications demanding autonomous fault detection, thermal resilience, and flicker-free grayscale control in harsh operating environments.
FAQ
What is the maximum sink current per channel for the TLC5949PWPR?
The TLC5949PWPR supports a maximum constant-current sink of 45 mA per channel (OUT0–OUT15) when configured with RIREF = 1.13 kΩ and global brightness control (BC) set to 7Fh (127). Current scales linearly down to 2 mA minimum via RIREF selection, and further reduced proportionally using the 7-bit BC register (25–100% range). Absolute maximum rating is 60 mA per output.
How does the TLC5949PWPR perform invisible LED open/short detection?
The TLC5949PWPR performs invisible LED open (LOD) and short (LSD) detection by sampling output voltage thresholds during active PWM cycles - without inserting blanking periods or disrupting display timing. Four programmable LOD/LSD voltage levels (VLOD0–VLOD3, VLSD0–VLSD3) allow calibration to LED forward voltage variations. Detection results appear on SOUT after the next LAT assertion.
Can the TLC5949PWPR be daisy-chained, and how many devices can be cascaded?
Yes, the TLC5949PWPR supports daisy-chaining via SIN→SOUT interconnection between devices. Each device consumes 193 bits per frame (128 GS + 7 BC + 58 control bits), and the common shift register allows unlimited cascading in theory. Practical limits depend on SCLK timing margin; at 33 MHz, >10 devices maintain reliable timing with proper PCB layout and termination.
What thermal advantages does the HTSSOP-24 (PWP) package provide for the TLC5949PWPR?
The HTSSOP-24 (PWP) package of the TLC5949PWPR features an exposed PowerPAD thermally connected to VCC, achieving θJA = 39.9°C/W and θJCbot = 3.8°C/W - nearly half the junction-to-ambient resistance of the SSOP-24 (DBQ) variant. This enables sustained 45 mA/channel operation at +85°C ambient without external heatsinking when mounted on ≥2 oz copper with thermal vias.
Does the TLC5949PWPR support both conventional and enhanced-spectrum PWM modes?
Yes, the TLC5949PWPR supports two PWM architectures selectable via the ESPWM bit in the control data latch: conventional PWM (fixed-frequency, deterministic timing) and enhanced-spectrum (ES) PWM (spread-spectrum modulation). ES-PWM reduces peak EMI by >15 dB and eliminates visible beat patterns in high-refresh-rate displays - critical for medical and broadcast applications.
TLC5949PWPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-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):
- 3.6V
- Voltage - Output:
- 10V
- Current - Output / Channel:
- 45mA
- Frequency:
- 33MHz
- Dimming:
- PWM
- Applications:
- Signage
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-HTSSOP
TLC5949PWPR FAQ
1.How can I place an order for TLC5949PWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5949PWPR 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 TLC5949PWPR reliable?
The price and inventory of TLC5949PWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5949PWPR is usually 5 days.
3.What payment methods are accepted for TLC5949PWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5949PWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5949PWPR?
TLC5949PWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5949PWPR 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 TLC5949PWPR?
For technical support, including TLC5949PWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5949PWPR requirements.
6.How does Aetrix verify that TLC5949PWPR is sourced from the original manufacturer or authorized distributors?
All TLC5949PWPR 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 TLC5949PWPR meets industry standards.
7.What is the process for return or replacement of TLC5949PWPR?
All TLC5949PWPR units undergo pre-shipment inspection (PSI). If there is an issue with TLC5949PWPR, 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 TLC5949PWPR part is unused and in its original packaging.
Return procedure for TLC5949PWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLC5949PWPR Tags
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BCR420UE6433HTMA1
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