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Texas Instruments TLC5947DAPR
- Part No.:
- TLC5947DAPR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 32-PowerTSSOP (0.240", 6.10mm Width)
- Datasheet:
-
TLC5947DAPR.pdf
- Description:
- IC LED DRVR LINEAR 30MA 32HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
TLC5947DAPR from Texas Instruments is a 24-channel, 12-bit PWM constant-current LED sink driver in a 32-pin HTSSOP package with PowerPAD™. It delivers up to 30 mA per channel, supports LED supply voltages up to 30 V, and integrates a 4-MHz internal oscillator for standalone operation - used in high-fidelity static LED displays requiring precise grayscale control.
For engineers reviewing the TLC5947DAPR datasheet, TLC5947DAPR pinout, TLC5947DAPR application, or TLC5947DAPR equivalent, key selection considerations include its 24-channel sink architecture, ±2% channel-to-channel current accuracy, thermal shutdown behavior, and cascaded 15-MHz serial interface timing.
Technical Context
The TLC5947DAPR implements a 12-bit (4096-step) grayscale PWM engine synchronized to an internal 4-MHz oscillator, eliminating external clock dependency. Each of its 24 constant-current sinks is individually programmed via a 288-bit serial shift register and latched on XLAT rising edge.
It features grouped 6-channel turn-on/turn-off sequencing to suppress inrush current and EMI, thermal shutdown activation at 162°C (typ), and auto-display repeat enabling continuous PWM cycling without host timing intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 24 independent constant-current sink outputs (OUT0–OUT23) |
| PWM resolution | 12-bit (4096 grayscale steps), enabling 0.02% to 99.98% duty control |
| Output current | Up to 30 mA per channel, set by single external IREF resistor (e.g., 1.6 kΩ → 30 mA) |
| LED voltage support | Up to 30 V across OUT pins, allowing direct drive of multi-LED strings |
| Supply range | VCC = 3.0 V to 5.5 V - compatible with 3.3 V and 5 V logic systems |
| Serial interface speed | 30 MHz standalone SCLK; 15 MHz in cascaded configuration (50% duty cycle) |
| Thermal shutdown | Activates at 162°C (typ), auto-restarts when junction cools by ≥10°C hysteresis |
Pinout & Package
Package: HTSSOP-32 (DAP) with exposed thermal pad (11.00 mm × 6.20 mm); requires soldered PowerPAD™ for rated thermal performance (RθJA = 32.8°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BLANK (Pin 2) | Global output enable/disable control | High forces all 24 outputs OFF and resets grayscale counter; low enables PWM-controlled sinking |
| SIN (Pin 4) | Serial data input | MSB-first 288-bit grayscale data stream shifted in on SCLK rising edge |
| SCLK (Pin 3) | Serial clock input | Rising edge clocks data into shift register; falling edge clocks MSB out on SOUT |
| XLAT (Pin 30) | Latch strobe | Rising edge transfers 288-bit GS data from shift register to latch, initiating new display period |
| SOUT (Pin 29) | Serial data output | Shifts out MSB of grayscale register on SCLK falling edge - enables daisy-chaining |
| IREF (Pin 31) | Current reference terminal | Connects external resistor to GND to set full-scale sink current (e.g., 1.6 kΩ → 30 mA) |
| OUT0–OUT23 (Pins 5–12, 13–16, 17–28, 22–28) | Constant-current sink outputs | 24 individually controlled channels; grouped into four 6-channel sets for staggered turn-on/turn-off |
| VCC (Pin 32) | Power supply | 3.0–5.5 V digital and analog supply; powers logic, oscillator, and current references |
| GND (Pin 1) | Ground reference | Common return for VCC, IREF, and all OUTx current paths; connects to thermal pad |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 4-MHz oscillator | Enables fully self-timed PWM operation - no external clock required for basic grayscale display |
| ±2% channel-to-channel current matching | Ensures uniform LED brightness across all 24 channels without per-channel calibration |
| 4-group staggered output switching | Reduces peak inrush current and system-level EMI by sequencing six-channel groups with nanosecond delays |
| Auto-display repeat mode | Continuously cycles grayscale PWM without host intervention after initial XLAT trigger |
| Thermal shutdown with hysteresis | Protects against sustained overtemperature; restarts automatically once junction cools ≥10°C below trip point |
Applications
| Static LED Message Boards | Architectural LED Signage |
|---|---|
Use Scenario: Outdoor alphanumeric message boards using high-brightness LED modules arranged in 24-channel segments. IC Role / Device Role / Timing Role: Constant-current sink driver providing synchronized 12-bit grayscale PWM to each LED segment, managed via daisy-chained serial interface. Use Value: Enables smooth brightness transitions and flicker-free text animation while maintaining consistent color balance across large displays. |
Use Scenario: Indoor/outdoor architectural lighting installations with RGBW LED strips segmented into 24-channel zones. IC Role / Device Role / Timing Role: Channel-isolated current sink delivering precise current to each LED string, coordinated via internal oscillator and XLAT-latched grayscale updates. Use Value: Eliminates need for external clock distribution and reduces PCB routing complexity in multi-zone lighting controllers. |
| Amusement Park Illumination | TV Backlight Dimming Modules |
Use Scenario: Dynamic lighting effects in rides and themed environments using addressable LED arrays driven in 24-channel banks. IC Role / Device Role / Timing Role: High-accuracy current sink enabling real-time intensity modulation synchronized to motion or audio triggers. Use Value: Delivers stable 30 mA per channel up to 30 V, supporting mixed-color LED strings without external current-setting components. |
Use Scenario: Local dimming zones in LCD TV backlights where 24 individual LED strings require independent brightness control. IC Role / Device Role / Timing Role: PWM grayscale controller with thermal shutdown protecting against localized overheating in confined backlight assemblies. Use Value: Provides 12-bit dimming resolution and ±2% current matching essential for minimizing visible banding in high-dynamic-range video. |
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 | Lacks auto-display repeat and oscillator - demands precise external timing source | Select when system already provides stable 1–30 MHz clock and board space is constrained (28-pin vs 32-pin) |
| IS31FL3728-QFLS4-TR | 28-channel, 12-bit, I²C interface; integrated open-drain drivers; QFN-40 package | Uses I²C instead of SPI-like serial interface; no BLANK/XLAT control signals; different pinout and protocol stack | Select for microcontroller-based designs with I²C availability and need for higher channel count in compact layout |
Compared with TLC5947DAPR, TLC5940IPWPR trades integrated timing for smaller footprint and lower cost, while IS31FL3728-QFLS4-TR replaces serial-shift simplicity with I²C configurability and expanded channel count - neither offers identical oscillator autonomy or XLAT-synchronized latch behavior.
Availability
TLC5947DAPR is available at Aetrix Electronics and suitable for static LED displays, message boards, amusement illumination, and TV backlighting requiring stable component supply, long-term manufacturability, and automotive-grade temperature resilience (–40°C to +85°C).
Supply support for TLC5947DAPR 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 ICs, with decades of expertise in precision analog front-ends and LED control solutions.
The TLC5947 belongs to TI's high-accuracy LED driver product line, designed specifically for applications demanding uniform grayscale fidelity, thermal robustness, and minimal external component count in commercial and industrial signage.
FAQ
What is the maximum LED forward voltage supported by the TLC5947DAPR?
The TLC5947DAPR supports up to 30 V across its OUT0–OUT23 pins, enabling direct drive of multi-LED series strings without external boost circuitry. This rating holds across the full operating temperature range (–40°C to +85°C) and is specified under absolute maximum conditions - actual design margin depends on thermal management and current setting via IREF.
How does the TLC5947DAPR achieve thermal protection?
The TLC5947DAPR incorporates an internal thermal shutdown (TSD) circuit that disables all 24 output drivers when junction temperature exceeds 162°C (typical). Outputs automatically resume operation after the junction cools by at least 10°C hysteresis. This behavior is fully autonomous and requires no external supervision - critical for unattended LED signage deployments.
Can the TLC5947DAPR operate without an external clock source?
Yes - the TLC5947DAPR integrates a factory-trimmed 4-MHz internal oscillator, allowing full 12-bit PWM grayscale operation without any external clock signal. This oscillator drives both the grayscale counter and auto-display repeat function, making the device ideal for systems with limited GPIO or timing resources.
What is the purpose of the XLAT pin on the TLC5947DAPR?
The XLAT (latch) pin on the TLC5947DAPR initiates transfer of the 288-bit grayscale data from the serial shift register into the active PWM latch. A rising edge on XLAT freezes the current grayscale values and starts a new display period - ensuring glitch-free, synchronized brightness updates across all 24 channels.
How is output current calibrated on the TLC5947DAPR?
Output current on the TLC5947DAPR is set by a single external resistor (RIREF) connected between IREF (Pin 31) and GND. For example, a 1.6 kΩ resistor yields ~30 mA per channel (±2% channel-to-channel). The relationship is linear and documented in TI's SBVS114B datasheet Figure 4 - no per-channel trimming or DACs are required.
TLC5947DAPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-PowerTSSOP (0.240", 6.10mm Width)
- 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-HTSSOP
TLC5947DAPR FAQ
1.How can I place an order for TLC5947DAPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5947DAPR 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 TLC5947DAPR reliable?
The price and inventory of TLC5947DAPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5947DAPR is usually 5 days.
3.What payment methods are accepted for TLC5947DAPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5947DAPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5947DAPR?
TLC5947DAPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5947DAPR 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 TLC5947DAPR?
For technical support, including TLC5947DAPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5947DAPR requirements.
6.How does Aetrix verify that TLC5947DAPR is sourced from the original manufacturer or authorized distributors?
All TLC5947DAPR 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 TLC5947DAPR meets industry standards.
7.What is the process for return or replacement of TLC5947DAPR?
All TLC5947DAPR units undergo pre-shipment inspection (PSI). If there is an issue with TLC5947DAPR, 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 TLC5947DAPR part is unused and in its original packaging.
Return procedure for TLC5947DAPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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