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Texas Instruments TLC5929PWPR
- Part No.:
- TLC5929PWPR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TLC5929PWPR.pdf
- Description:
- IC LED DRVR LINEAR 50MA 24HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:8,818
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Product details
Overview
TLC5929PWPR from Texas Instruments is a 16-channel constant-current LED sink driver with 7-bit global brightness control (128 steps), ±1% typical channel-to-channel current accuracy, and integrated LED open/short detection. It operates from 3.0 V to 5.5 V supply voltage, supports up to 10 V LED supply, and delivers up to 50 mA per channel at VCC > 3.6 V - used in variable message signs and architectural LED illumination systems.
For engineers reviewing the TLC5929PWPR datasheet, TLC5929PWPR pinout, TLC5929PWPR application, or TLC5929PWPR equivalent, key selection criteria include its daisy-chainable serial interface (33 MHz SCLK), invisible detection mode for fault diagnosis during output-off states, power-save mode (10 µA ICC), and HTSSOP-24 PowerPAD™ thermal performance.
Technical Context
The TLC5929PWPR implements a 17-bit serial shift register with dual 16-bit latches: one for output on/off control and one for function configuration (global brightness, LSD voltage select, error flags). Its constant-current sink architecture uses a single external IREF resistor to set maximum per-channel current, with 7-bit BC data scaling all outputs linearly from 0% to 100% of that maximum.
Error diagnostics include LED open detection (LOD), LED short detection (LSD) with four selectable threshold voltages, output leakage detection (OLD ≥3 µA), pre-thermal warning (138°C), and thermal shutdown (150°C). All flags are readable via the same serial interface used for control data.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output channels | 16 constant-current sink outputs, each independently controllable via serial data |
| Max sink current | 50 mA per channel at VCC > 3.6 V; set by external IREF resistor (1.32–66 kΩ) |
| Brightness control | 7-bit global control (128 steps); scales all outputs simultaneously without PWM timing overhead |
| Data rate | 33 MHz SCLK - enables fast update of 16-channel state in ≤512 ns (17 bits) |
| BLANK pulse width | Minimum 40 ns - supports high-frequency blanking for flicker-free multiplexed displays |
| Thermal protection | Pre-thermal warning at 138°C; thermal shutdown at 150°C with 5–20°C hysteresis |
| Supply current | 10 µA in power-save mode (all outputs off); 5–14 mA active depending on load and BC setting |
Pinout & Package
HTSSOP-24 PowerPAD™ package with exposed thermal pad on bottom side for enhanced heat dissipation (θJCbot = 5.7°C/W). Pin 1 is SIN; pin 24 is VCC; pin 12 is OUT7; pin 13 is OUT8; pin 21 is BLANK; pin 22 is GND; pin 23 is IREF; pin 19 is SOUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SIN | Serial input | LSB-first data entry point for 17-bit shift register; synchronous to SCLK rising edge |
| SCLK | Serial clock | Drives data shift; 33 MHz max frequency defines minimum update latency for full 16-channel state |
| LAT | Data latch | Rising edge transfers lower 16 bits of shift register to output or control latch based on MSB value |
| BLANK | Global output disable | Active-high signal forces all 16 outputs OFF instantly - critical for display blanking and fault isolation |
| IREF | Current reference | Analog input tied to external resistor; sets maximum sink current for all channels with ±2% device-to-device accuracy |
| SOUT | Serial output | MSB of shift register; enables daisy-chaining multiple TLC5929PWPR devices without additional controllers |
| OUT0–OUT15 | Constant-current sinks | 16 independent open-drain outputs; each capable of sinking up to 50 mA with <2 ns inter-channel delay |
| GND / VCC | Power terminals | Dual GND pins (pins 1 and 22) and dedicated VCC (pin 24) minimize ground bounce in high-speed switching |
Key Features
| Feature | Design Value |
|---|---|
| Invisible detection mode (IDM) | LOD and LSD diagnostics operate even when outputs are OFF - enables real-time health monitoring without visual interruption |
| Daisy-chain capability | Single SCLK/SIN pair controls unlimited devices via SOUT-to-SIN cascading - reduces MCU GPIO count and simplifies PCB routing |
| Power-save mode | Reduces ICC to 10 µA (typ) when all outputs disabled - essential for battery-powered signage and low-power standby states |
| Channel-to-channel accuracy | ±1% (typ), ±3% (max) current matching ensures uniform LED brightness across 16 channels without per-channel calibration |
| LED fault coverage | Detects open circuits (LOD), shorts to VLED or GND (LSD), and leakage >3 µA (OLD) - comprehensive failure-mode coverage for safety-critical lighting |
Applications
| Variable Message Signs (VMS) | Architectural LED Illumination |
|---|---|
Use Scenario: Outdoor highway signage requiring high reliability, wide temperature operation (–40°C to +85°C), and real-time LED health reporting. IC Role / Device Role / Timing Role: Constant-current sink driver managing 16 LED segments per module; daisy-chained across sign rows for centralized control. Use Value: Invisible detection mode identifies failed LEDs during nighttime operation without disrupting displayed messages - enabling predictive maintenance. | Use Scenario: Multi-color façade lighting where color consistency and long-term luminance stability are critical. IC Role / Device Role / Timing Role: Precision current source for RGB LED strings; global brightness control adjusts white-point and intensity uniformly across hundreds of nodes. Use Value: ±1% channel-to-channel current accuracy eliminates visible banding or tint shifts between adjacent LED modules under varying thermal loads. |
| Industrial Panel Displays | Emergency Exit Signage |
Use Scenario: Harsh-environment HMI panels needing ESD robustness (4 kV HBM), undervoltage lockout, and thermal fault response. IC Role / Device Role / Timing Role: LED driver with pre-thermal warning (138°C) and shutdown (150°C) - protects against overheating in enclosed enclosures. Use Value: Thermal error flag triggers controller-initiated derating before catastrophic failure - extends system MTBF in unventilated cabinets. | Use Scenario: Life-safety exit signs requiring continuous self-test, fail-safe indication, and battery-backed operation. IC Role / Device Role / Timing Role: Fault-detecting LED driver with LOD/LSD/OLD flags readable over serial interface during periodic self-test cycles. Use Value: Detects open or shorted LEDs during brief test pulses - confirms illumination integrity without illuminating the sign during standby. |
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 |
|---|---|---|---|
| TLC5940RHBR | 16-channel, but uses internal DAC-based grayscale control (12-bit) instead of 7-bit global BC; no built-in LOD/LSD; requires external current-setting resistors per channel | Preferred for high-fidelity grayscale video displays; lacks integrated fault detection needed for safety-critical signage | Select TLC5929PWPR when LED health monitoring, thermal protection, and single-resistor current tuning are required |
| MAX7219CWG+ | 8-digit/64-LED scan driver with internal decode; fixed 40 mA per segment; no per-channel current adjustment or fault detection | Targeted at 7-segment numeric displays; not suitable for arbitrary LED matrix or high-reliability fault-aware systems | Choose TLC5929PWPR for non-multiplexed constant-current driving of discrete LEDs with diagnostic capability |
Compared with TLC5940RHBR and MAX7219CWG+, the TLC5929PWPR uniquely combines daisy-chainable serial control, single-resistor current programming, invisible fault detection, and thermal warning - making it optimal for industrial LED signage where reliability and serviceability outweigh raw grayscale resolution.
Availability
TLC5929PWPR is available at Aetrix Electronics and suitable for variable message signs, architectural LED illumination, and industrial panel displays requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TLC5929PWPR 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The TLC5929 product line was designed specifically for high-reliability LED signage and illumination systems requiring integrated diagnostics, thermal resilience, and daisy-chain scalability - not general-purpose LED driving.
FAQ
What is the maximum LED supply voltage supported by the TLC5929PWPR?
The TLC5929PWPR supports LED supply voltages up to 10 V at its OUT0–OUT15 terminals. This allows direct connection to common LED string configurations without external boost circuitry. The device itself operates from a separate 3.0 V to 5.5 V VCC rail, isolating logic and power domains. Absolute maximum rating for OUTn is +11 V, but sustained operation above 10 V is not recommended per TI's design guidance.
How does the invisible detection mode (IDM) work in the TLC5929PWPR?
The invisible detection mode (IDM) in the TLC5929PWPR enables LED open detection (LOD) and LED short detection (LSD) while all outputs remain OFF. It uses internal biasing and sampling during BLANK-high periods to measure terminal conditions without activating LEDs. This allows continuous health monitoring in signage systems without visible flicker or unintended illumination - a feature confirmed in the SBVS159B datasheet section "LED Open Detection (LOD)/LED Short Detection (LSD) with Invisible Detection Mode (IDM)".
Can the TLC5929PWPR be used in daisy-chain configuration, and what is the maximum number of devices?
Yes, the TLC5929PWPR supports unlimited daisy-chaining via its SOUT-to-SIN interface. Each device shifts out its MSB to the next device's SIN on every SCLK rising edge. While no hard limit is specified, practical constraints include SCLK timing margin degradation and total propagation delay - TI's typical application circuit shows 3+ devices with 33 MHz SCLK. The TLC5929PWPR's 2-ns inter-channel delay ensures minimal skew across long chains.
What is the purpose of the IREF pin on the TLC5929PWPR, and how is current set?
The IREF pin on the TLC5929PWPR is the reference current input terminal. A single external resistor (RIREF) connected between IREF and GND sets the maximum sink current for all 16 channels. With VIREF ≈ 1.205 V, IOLCMax = 54.8 × VIREF / RIREF. For example, a 1.32 kΩ resistor yields ~50 mA per channel at VCC > 3.6 V. RIREF must be between 1.32 kΩ and 66.0 kΩ to maintain stability and achieve 1–50 mA range.
Does the TLC5929PWPR support thermal management features beyond shutdown?
Yes, the TLC5929PWPR includes pre-thermal warning (PTW) at 138°C (typ) and thermal shutdown (TSD) at 150°C (typ), both with programmable hysteresis (5–20°C). The PTW flag alerts the host controller before TSD activates, allowing proactive derating - such as reducing global brightness or disabling non-critical channels. This two-tier thermal response is documented in the Electrical Characteristics table under parameters TPTW and TTEF.
TLC5929PWPR 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):
- 5.5V
- Voltage - Output:
- 10V
- Current - Output / Channel:
- 50mA
- Frequency:
- 20MHz
- Dimming:
- -
- Applications:
- Signage
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-HTSSOP
TLC5929PWPR FAQ
1.How can I place an order for TLC5929PWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5929PWPR 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 TLC5929PWPR reliable?
The price and inventory of TLC5929PWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5929PWPR is usually 5 days.
3.What payment methods are accepted for TLC5929PWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5929PWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5929PWPR?
TLC5929PWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5929PWPR 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 TLC5929PWPR?
For technical support, including TLC5929PWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5929PWPR requirements.
6.How does Aetrix verify that TLC5929PWPR is sourced from the original manufacturer or authorized distributors?
All TLC5929PWPR 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 TLC5929PWPR meets industry standards.
7.What is the process for return or replacement of TLC5929PWPR?
All TLC5929PWPR units undergo pre-shipment inspection (PSI). If there is an issue with TLC5929PWPR, 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 TLC5929PWPR part is unused and in its original packaging.
Return procedure for TLC5929PWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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