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Texas Instruments TLC5943RHBR
- Part No.:
- TLC5943RHBR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
TLC5943RHBR.pdf
- Description:
- IC LED DRIVER LINEAR 50MA 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,183
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Product details
Overview
TLC5943RHBR from Texas Instruments is a 16-channel, 16-bit PWM LED driver with 7-bit global brightness control and constant-current sink outputs. It delivers 50-mA per channel, supports 33-MHz grayscale clocking, enables LED open detection (LOD) and thermal error flag (TEF), and operates across –40°C to +85°C for monochrome/multicolor LED displays.
For engineers reviewing the TLC5943RHBR datasheet, TLC5943RHBR pinout, TLC5943RHBR application, or TLC5943RHBR equivalent, key selection criteria include its QFN-32 package, 16-bit enhanced-spectrum PWM timing, dual-level error reporting (LOD/TEF), and serial interface compatibility with daisy-chained configurations in high-reliability signage and backlighting systems.
Technical Context
The TLC5943RHBR implements an enhanced-spectrum (ES) PWM architecture dividing each display period into 128 segments and supporting up to 65,536 grayscale steps via 16-bit GS data. Its dual-latch structure separates grayscale and brightness control registers, selected by BCSEL, enabling independent update of per-channel intensity and global current scaling.
It integrates on-die LED open detection across all 16 channels during active display periods and a thermal shutdown circuit that forces all outputs off at ≥150°C junction temperature, with 5–20°C hysteresis. Output current is set by a single external resistor (RIREF) connected to IREF/GND, yielding ±1.5% channel-to-channel and ±3% device-to-device accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 16 constant-current sink outputs (OUT0–OUT15), each independently controllable |
| Grayscale resolution | 16-bit (65,536 steps) with ES-PWM timing-enables flicker-free, high-fidelity intensity gradation |
| Brightness control | 7-bit (128 steps) global current scaling-adjusts all channels simultaneously without reprogramming GS data |
| Max output current | 50 mA per channel (set via RIREF); ±1.5% channel-to-channel matching ensures uniform LED luminance |
| Error detection | Real-time LED open detection (LOD) and thermal error flag (TEF)-provides fault status via open-drain XERR pin |
| Supply & temp | VCC = 3.0 V to 5.5 V; operating range –40°C to +85°C-suitable for industrial and outdoor LED applications |
| Interface speed | 30-MHz serial data clock (SCLK); 33-MHz grayscale clock (GSCLK)-supports fast refresh and high-throughput data loading |
Pinout & Package
Package: 5 mm × 5 mm QFN-32 with exposed thermal pad (PowerPAD™). Pin-compatible with TLC5943PWP (HTSSOP-28) but differs in footprint, thermal performance, and pin assignment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SIN | Serial input | Data input for GS/BC shift registers; Schmitt-triggered for noise immunity in noisy LED environments |
| SCLK | Serial clock | Rising-edge-shift clock for GS/BC data; max 30 MHz-enables rapid configuration of 16×16-bit data |
| XLAT | Latch strobe | Low-to-high transition transfers shift register contents to first latch-synchronizes display updates across daisy chains |
| BLANK | Global disable | High level forces all outputs OFF, resets GS counter, and initializes PWM controller-used for flicker-free blanking |
| GSCLK | Grayscale clock | Rising edge increments ES-PWM counter; 33 MHz max-determines grayscale timing precision and display frame rate |
| IREF | Current reference | Analog input/output pin setting max sink current via external resistor (RIREF = 984 Ω to 9.84 kΩ) |
| XERR | Error flag | Open-drain output asserted low on LOD or TEF-enables system-level fault monitoring without polling |
| OUT0–OUT15 | Constant-current sinks | 16 dedicated output terminals; each drives one LED cathode with programmable current and PWM duty cycle |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced Spectrum PWM | 16-bit grayscale with non-uniform ON-time distribution across 128 display segments-reduces EMI and visual flicker vs. standard PWM |
| Continuous LOD | Detects open-circuit and GND-short LED faults during active display-not just at startup-enabling real-time reliability monitoring |
| Auto Display Repeat | Hardware-based display auto-refresh eliminates MCU intervention during static content-reduces host processor load |
| 4-channel grouped delay | Output switching staggered in 4-channel groups-limits inrush current spikes when driving large LED arrays |
| Thermal shutdown w/ hysteresis | Automatic output disable above +150°C junction temp; restarts only after cooling ≥5°C-prevents thermal runaway in enclosed fixtures |
Applications
| Monochrome LED Signboards | Full-Color RGB Video Walls |
|---|---|
Use Scenario: Outdoor alphanumeric message boards with high-brightness red/green/yellow LEDs under variable ambient light. IC Role / Device Role / Timing Role: Constant-current sink driver delivering precise 50-mA per segment with 16-bit grayscale depth and LOD fault reporting. Use Value: Ensures consistent brightness across 1000+ segments; LOD detection prevents "dead pixel" propagation in field-deployed units. | Use Scenario: Indoor high-resolution video walls using surface-mount RGB LED modules with tight thermal constraints. IC Role / Device Role / Timing Role: Primary grayscale controller managing 16×3 = 48 LED channels per tile, synchronized via daisy-chained GSCLK/XLAT. Use Value: ES-PWM reduces electromagnetic interference near sensitive AV equipment; thermal flag triggers fan control before LED derating occurs. |
| Automotive Interior Backlighting | Industrial HMI Panels |
Use Scenario: Dashboard and center-stack backlighting with dimmable white LEDs meeting automotive AEC-Q100 temperature and reliability requirements. IC Role / Device Role / Timing Role: Dual-function driver applying 7-bit BC for ambient-light-adaptive dimming and 16-bit GS for smooth fade transitions. Use Value: Achieves <1% luminance step resolution across 0–100% brightness; TEF prevents thermal damage during prolonged high-intensity operation. | Use Scenario: Factory-floor operator interfaces with high-visibility status indicators subject to voltage transients and wide temperature swings. IC Role / Device Role / Timing Role: Robust LED driver with CMOS-level I/O, ±2-kV HBM ESD rating, and continuous LOD for predictive maintenance alerts. Use Value: Eliminates false fault alarms during ESD events; open-drain XERR directly interfaces with PLC input modules for centralized diagnostics. |
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 16-bit GS/7-bit BC architecture; adds internal 3.3-V LDO and SPI interface | Higher channel count suits larger displays; integrated LDO simplifies power design but increases quiescent current | Select when expanding beyond 16 channels or requiring single-supply operation with regulated VCC |
| IS31FL3731-QFLS4-TR | 18×16 matrix driver with auto-breathing, no external IREF; I²C interface only | Optimized for grid-based LED arrays; lacks LOD/TEF and requires host-controlled fault handling | Select for compact I²C-based designs where matrix addressing and animation features outweigh discrete fault reporting needs |
Compared with TLC5943RHBR, TLC5947RGER offers higher integration and scalability at the cost of increased complexity and power, while IS31FL3731-QFLS4-TR trades hardware fault autonomy for simplified control and smaller footprint in matrix applications.
Availability
TLC5943RHBR is available at Aetrix Electronics and suitable for monochrome signboards, full-color video walls, and automotive interior backlighting requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TLC5943RHBR 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 U.S.-based semiconductor company specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and high-reliability interface solutions.
The TLC5943RHBR belongs to TI's LED driver product line, designed specifically for high-precision, high-channel-count LED illumination systems demanding flicker-free grayscale, robust fault detection, and thermal resilience in industrial and commercial displays.
FAQ
What is the maximum output current per channel for the TLC5943RHBR?
The TLC5943RHBR supports a maximum constant-current sink of 50 mA per channel (OUT0–OUT15), set by an external resistor (RIREF) connected between IREF and GND. Typical operation ranges from 5 mA to 50 mA depending on RIREF value (984 Ω to 9.84 kΩ), with ±1.5% channel-to-channel current matching ensuring uniform LED brightness across all 16 outputs in the TLC5943RHBR.
How does the TLC5943RHBR implement LED open detection (LOD)?
The TLC5943RHBR performs continuous LED open detection during active display periods-not just at initialization-by monitoring voltage at each OUTx pin while sinking current. If the voltage exceeds 0.2–0.4 V (indicating an open or GND-short condition), the fault is latched and reported via the open-drain XERR pin. This real-time LOD capability is integral to the TLC5943RHBR's reliability in mission-critical signage and HMI applications.
Can the TLC5943RHBR be daisy-chained with other TLC5943 devices?
Yes, the TLC5943RHBR supports seamless daisy-chaining via its SIN/SOUT serial interface. Data written to the first device's SIN propagates through SOUT to the next device's SIN, allowing synchronized grayscale and brightness updates across multiple TLC5943RHBR ICs. XLAT and BLANK signals must be shared across the chain to ensure simultaneous latch and blanking-enabling scalable LED array control without additional GPIO overhead.
What is the function of the BCSEL pin on the TLC5943RHBR?
The BCSEL pin on the TLC5943RHBR selects between two internal shift registers: when low, it routes serial data (SIN) to the 16-bit grayscale (GS) register; when high, it routes data to the 7-bit brightness control (BC) register. This dual-register architecture allows independent programming of per-channel intensity (GS) and global current scaling (BC), both updated via the same serial interface-reducing pin count while preserving functional flexibility in the TLC5943RHBR.
Does the TLC5943RHBR require external components for basic operation?
Yes, the TLC5943RHBR requires at minimum an external resistor (RIREF) between IREF and GND to set the maximum output current, plus decoupling capacitors on VCC and GND. The XTEST pin must be tied to either VCC or GND (not left floating), and all unused NC pins should remain unconnected. No external oscillator or clock generator is needed-the TLC5943RHBR accepts externally driven SCLK and GSCLK signals, making it adaptable to diverse timing architectures in the final system design using the TLC5943RHBR.
TLC5943RHBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- 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:
- 50mA
- Frequency:
- 30MHz
- Dimming:
- -
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VQFN (5x5)
TLC5943RHBR FAQ
1.How can I place an order for TLC5943RHBR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5943RHBR 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 TLC5943RHBR reliable?
The price and inventory of TLC5943RHBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5943RHBR is usually 5 days.
3.What payment methods are accepted for TLC5943RHBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5943RHBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5943RHBR?
TLC5943RHBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5943RHBR 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 TLC5943RHBR?
For technical support, including TLC5943RHBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5943RHBR requirements.
6.How does Aetrix verify that TLC5943RHBR is sourced from the original manufacturer or authorized distributors?
All TLC5943RHBR 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 TLC5943RHBR meets industry standards.
7.What is the process for return or replacement of TLC5943RHBR?
All TLC5943RHBR units undergo pre-shipment inspection (PSI). If there is an issue with TLC5943RHBR, 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 TLC5943RHBR part is unused and in its original packaging.
Return procedure for TLC5943RHBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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