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Texas Instruments TLC5947RHBR
- Part No.:
- TLC5947RHBR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
TLC5947RHBR.pdf
- Description:
- IC LED DRIVER LINEAR 30MA 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,923
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Product details
Overview
TLC5947RHBR from Texas Instruments is a 24-channel, constant-current sink LED driver IC with 12-bit (4096-step) PWM grayscale control, 30-mA per channel output capability, integrated 4-MHz internal oscillator, and thermal shutdown protection. It operates from 3.0 V to 5.5 V supply and supports LED power voltages up to 30 V - used in high-fidelity static LED displays requiring precise brightness uniformity.
For engineers reviewing the TLC5947RHBR datasheet, TLC5947RHBR pinout, TLC5947RHBR application, or TLC5947RHBR equivalent, key selection factors include channel-to-channel current accuracy (±2% typ), cascaded data transfer rate (15 MHz), grouped 4-channel delay for EMI reduction, and IREF resistor-based current setting - all critical for scalable LED matrix designs.
Technical Context
The TLC5947RHBR implements a fully autonomous PWM timing engine driven by its internal 4-MHz oscillator, eliminating external clock dependencies. Grayscale data (288 bits) are serially loaded via SIN/SCLK, latched on XLAT rising edge, and applied to 24 independent constant-current sinks with synchronized auto-repeat display cycles.
Its noise-reduction architecture staggers turn-on/turn-off across four groups of six outputs (e.g., OUT0/4/8/12/16/20 → OUT1/5/9/13/17/21 → etc.), limiting inrush current surges. Thermal shutdown activates at 162°C (typ) junction temperature and auto-recovers after hysteresis (5–20°C), ensuring robust operation in enclosed lighting enclosures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 24 independent constant-current sink outputs - enables single-chip control of full-color RGB modules or monochrome dot-matrix panels. |
| PWM resolution | 12-bit (4096 steps) grayscale - delivers >70 dB luminance dynamic range for smooth dimming without visible banding. |
| Output current | Up to 30 mA per channel (RIREF = 1.6 kΩ) - sufficient to drive standard 20-mA LEDs with margin for aging and temperature drift. |
| Current accuracy | ±2% channel-to-channel (typ) - ensures uniform brightness across multi-LED arrays without per-channel calibration. |
| Data rate | 15 MHz max (cascaded), 30 MHz (standalone) - supports real-time updates of full 24-channel GS data in <19.2 μs. |
| Supply voltage | VCC = 3.0 V to 5.5 V - compatible with 3.3 V and 5 V logic systems and mixed-voltage PCB architectures. |
| Thermal shutdown | Activates at TJ = 162°C (typ); restarts at TJ ≤ 157°C - protects against sustained overloads in sealed signage housings. |
Pinout & Package
Package: 32-pin HTSSOP (RHB), 11.00 mm × 6.20 mm body, PowerPAD™ thermal pad (exposed bottom).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT0–OUT23 | Constant-current sink output | 24 individually PWM-controlled outputs; each sinks up to 30 mA - connect directly to LED cathodes with anode tied to VLED. |
| SIN | Serial data input | CMOS-level input accepting 288-bit grayscale data stream; sampled on SCLK rising edge. |
| SCLK | Serial clock input | Drives internal shift register; supports 30 MHz standalone / 15 MHz cascaded operation with 50% duty cycle. |
| XLAT | Latch strobe input | Rising edge transfers GS data from shift register to latch; blanks all outputs until next grayscale period begins. |
| BLANK | Global output disable | High forces all OUTn off and resets grayscale counter - used for flicker-free frame blanking or power-up safety. |
| SOUT | Serial data output | Shifts out MSB of GS register on SCLK falling edge - enables daisy-chaining multiple TLC5947RHBR devices. |
| IREF | Current reference terminal | Connect external resistor (e.g., 1.6 kΩ) between IREF and GND to set nominal 30 mA per channel. |
| VCC | Digital supply | 3.0–5.5 V logic supply powering internal logic, oscillator, and interface - separate from LED anode voltage (VLED). |
| GND | Power ground | Analog/digital common reference; must be low-impedance connection to minimize current-sense error. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 4-MHz oscillator | Eliminates need for external clock source - reduces BOM count and layout complexity in space-constrained LED controllers. |
| Auto-display repeat | Self-cycling PWM operation after BLANK goes low - enables continuous animation without host MCU intervention. |
| 4-group staggered turn-on | Outputs sequenced in four 6-channel groups with inter-group delay - cuts peak inrush current by ~75% vs. simultaneous start. |
| Thermal shutdown with hysteresis | Shuts down at 162°C (typ), restarts at ≤157°C - prevents thermal runaway during ambient temperature spikes or airflow loss. |
| CMOS-compatible I/O | VIH ≥ 0.7×VCC, VIL ≤ 0.3×VCC - ensures reliable interfacing with 3.3 V and 5 V microcontrollers without level-shifting. |
Applications
| Static LED Message Boards | RGB LED Video Walls |
|---|---|
Use Scenario: Outdoor alphanumeric message boards using high-brightness through-hole or SMD LEDs arranged in 8×8 or 16×16 matrices. IC Role / Device Role / Timing Role: Constant-current sink driver providing synchronized 12-bit grayscale PWM to 24 LED strings per chip; cascaded for larger displays. Use Value: ±2% channel-to-channel current matching ensures uniform text luminance across entire board without per-LED trimming. |
Use Scenario: Indoor fine-pitch video walls where individual RGB subpixels require independent brightness control. IC Role / Device Role / Timing Role: One TLC5947RHBR drives eight RGB pixels (24 channels); multiple chips synchronized via shared XLAT/BLANK. Use Value: 4096-step grayscale enables >24-bit color depth per pixel when combined with spatial dithering, meeting broadcast-grade fidelity. |
| Amusement Park Illumination | TV Backlight Dimming Modules |
Use Scenario: Animated signage and interactive light sculptures subject to wide ambient temperature swings (–40°C to +85°C). IC Role / Device Role / Timing Role: LED current controller with thermal shutdown and auto-restart - maintains safe operation during extended runtime in unventilated enclosures. Use Value: Junction temperature monitoring prevents LED degradation or catastrophic failure under sustained high-current operation. |
Use Scenario: Edge-lit LCD TV backlights using white LEDs with local dimming zones controlled by microcontroller. IC Role / Device Role / Timing Role: Local dimming driver receiving GS data over SPI; BLANK synchronized to video frame rate for zero-motion blur. Use Value: 15 MHz cascaded data rate allows full-zone update within 1 ms - enabling real-time dynamic contrast enhancement. |
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 |
|---|---|---|---|
| TLC5940IPWPR | 24-channel, 12-bit, but requires external clock; no internal oscillator; HTSSOP-28 package (fewer pins, no SOUT). | Lacks daisy-chain capability and autonomous operation - suitable only where MCU provides precise clock and handles timing sequencing. | Select when system already uses external clock distribution and board space is constrained (smaller footprint). |
| IS31FL3731-QFLS4 | 28-channel, 8-bit PWM; integrated I²C interface; no SOUT/SIN cascade; different current-setting method (internal DAC + external resistor). | Designed for compact I²C-based UI lighting; lacks high-resolution grayscale and cascading needed for large displays. | Select for small-form-factor consumer devices where I²C simplicity outweighs grayscale depth and scalability. |
Compared with TLC5940IPWPR and IS31FL3731-QFLS4, the TLC5947RHBR uniquely combines internal oscillator autonomy, 12-bit resolution, and native daisy-chain support - making it optimal for scalable, high-fidelity LED display systems where timing precision and channel count matter most.
Availability
TLC5947RHBR is available at Aetrix Electronics and suitable for static LED message boards, RGB video walls, amusement park illumination systems, and TV backlight dimming modules requiring stable component supply, long-term manufacturability, and consistent parametric performance.
Supply support for TLC5947RHBR 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 connectivity technologies, with decades of expertise in precision power and signal chain solutions.
The TLC5947RHBR belongs to TI's high-accuracy LED driver product line, engineered specifically for professional-grade LED signage and display applications demanding tight current matching, thermal resilience, and scalable PWM control.
FAQ
What is the maximum LED forward voltage supported by the TLC5947RHBR?
The TLC5947RHBR supports LED power-supply voltage (VLED) up to 30 V, meaning each OUTn can sustain up to 30 V across the LED string while sinking current. This allows driving 8–10 white LEDs in series (VF ≈ 3.2 V each) or high-VF red/orange strings without external boost circuitry. The device itself operates from a separate 3.0–5.5 V VCC rail.
How does the TLC5947RHBR achieve ±2% channel-to-channel current accuracy?
The TLC5947RHBR achieves ±2% typical channel-to-channel current accuracy through matched internal current mirror circuitry and factory-trimmed reference design. Each OUTn shares the same IREF-derived bias, minimizing process variation impact. Accuracy is maintained across –40°C to +85°C ambient and is specified with RIREF = 1.6 kΩ and VOUTn = 1 V.
Can the TLC5947RHBR operate without an external microcontroller after initial configuration?
Yes - once grayscale data are loaded and XLAT is asserted, the TLC5947RHBR runs autonomously using its internal 4-MHz oscillator. With BLANK held low, it continuously repeats the grayscale display cycle without further host intervention, enabling "fire-and-forget" LED animation in resource-constrained systems.
What is the purpose of the SOUT pin on the TLC5947RHBR?
The SOUT pin outputs the most significant bit (MSB) of the grayscale shift register on the falling edge of SCLK, enabling seamless daisy-chaining of multiple TLC5947RHBR devices. When cascading, SOUT of one chip connects to SIN of the next, allowing a single 288×N-bit data stream to configure N drivers with synchronized timing.
Does the TLC5947RHBR require external components for thermal protection?
No - the TLC5947RHBR integrates a complete thermal shutdown (TSD) function with automatic recovery. It monitors junction temperature internally and disables all OUTn when TJ exceeds 162°C (typ), re-enabling them only after temperature falls below ~157°C. No external thermistor or circuitry is needed for basic overtemperature protection.
TLC5947RHBR 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:
- 24
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 30V
- Current - Output / Channel:
- 30mA
- Frequency:
- 4MHz
- Dimming:
- -
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VQFN (5x5)
TLC5947RHBR FAQ
1.How can I place an order for TLC5947RHBR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5947RHBR 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 TLC5947RHBR reliable?
The price and inventory of TLC5947RHBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5947RHBR is usually 5 days.
3.What payment methods are accepted for TLC5947RHBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5947RHBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5947RHBR?
TLC5947RHBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5947RHBR 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 TLC5947RHBR?
For technical support, including TLC5947RHBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5947RHBR requirements.
6.How does Aetrix verify that TLC5947RHBR is sourced from the original manufacturer or authorized distributors?
All TLC5947RHBR 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 TLC5947RHBR meets industry standards.
7.What is the process for return or replacement of TLC5947RHBR?
All TLC5947RHBR units undergo pre-shipment inspection (PSI). If there is an issue with TLC5947RHBR, 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 TLC5947RHBR part is unused and in its original packaging.
Return procedure for TLC5947RHBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLC5947RHBR Tags
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