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Texas Instruments TLC5957RTQR
- Part No.:
- TLC5957RTQR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 56-VFQFN Exposed Pad
- Datasheet:
-
TLC5957RTQR.pdf
- Description:
- IC LED DRIVER LINEAR 25MA 56QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,893
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Product details
Overview
TLC5957RTQR from Texas Instruments is a 48-channel, 16-bit ES-PWM constant-current LED sink driver with pre-charge FET, LED open detection (LOD), and caterpillar cancellation. It delivers individually adjustable grayscale control per channel (65536 steps), 3-bit global brightness (BC), and 9-bit per-color group brightness (CC) for RGB LED video displays. Designed for multiplexed LED signage operating at VCC = 3.0–5.5 V and output voltages up to 10 V.
For engineers reviewing the TLC5957RTQR datasheet, TLC5957RTQR pinout, TLC5957RTQR application, or TLC5957RTQR equivalent, key selection criteria include its 48-channel sink architecture, 33 MHz serial interface speed, thermal shutdown (160–180°C), ±3% max channel-to-channel current accuracy, and support for poker-mode data transmission to enhance visual refresh rate in high-density LED panels.
Technical Context
The TLC5957RTQR implements a triple-grouped 16-channel RGB sink architecture with independent 9-bit color brightness control (CCR/CCG/CCB) and 3-bit global brightness (BC), enabling precise white balance tuning and day/night dimming. Its ES-PWM mode with pre-charge FET actively suppresses ghosting and caterpillar artifacts caused by LED open faults.
Serial configuration uses daisy-chainable SIN/SOUT with SCLK (up to 33 MHz), LAT for latch control, and GCLK (33 MHz) for grayscale timing. LOD flag and thermal shutdown (TSD) are accessible via the same serial interface, supporting real-time fault monitoring without additional GPIOs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output channels | 48 constant-current sink outputs, grouped as 16×R, 16×G, 16×B for RGB LED matrix control |
| Grayscale resolution | 16-bit (65536-step) per channel, configurable 9–16 bit via poker-mode for optimized refresh rate |
| Current range | 1–25 mA per channel (VCC = 5 V), set via external IREF resistor; knee voltage 0.24 V @ 10 mA |
| Accuracy | ±3% max channel-to-channel, ±2% max device-to-device across all 48 outputs |
| Interface speed | 33 MHz SCLK and GCLK - enables >1 kHz frame rates in 16×16 multiplexed panels |
| Operating temp | –40°C to +85°C ambient; thermal shutdown triggers at 160–180°C junction temperature |
| Supply voltage | VCC = 3.0–5.5 V; supports LED power supply up to 10 V on OUTx pins |
Pinout & Package
Package: QFN-56 (RTQ), 8.0 mm × 8.0 mm body with exposed thermal pad soldered to PCB ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IREF | Reference current programming input | Connects external resistor to set max sink current; VIREF ≈ 1.209 V (typ) |
| IREFGND | Analog reference ground | Dedicated AGND for IREF resistor; must tie to analog ground trace near system GND point |
| GCLK | Grayscale PWM clock input | Rising edge increments GS counter; 33 MHz max frequency defines PWM timing resolution |
| LAT | Data latch control input | Falling edge transfers shift register contents to GS or FC latch; critical for display line synchronization |
| SCLK | Serial shift clock input | Rising edge shifts data from SIN into 48-bit common shift register; 33 MHz max rate |
| SIN | Serial data input | LSB-first serial input for GS, BC, CC, and FC data; supports daisy-chaining via SOUT |
| SOUT | Serial data output | MSB of shift register; connects to SIN of next TLC5957RTQR in daisy chain |
| OUTR0–OUTR15 | Red LED constant-current sinks | 16 dedicated sink outputs for red LEDs; each independently PWM-controlled |
| OUTG0–OUTG15 | Green LED constant-current sinks | 16 dedicated sink outputs for green LEDs; grouped for per-color brightness scaling |
| OUTB0–OUTB15 | Blue LED constant-current sinks | 16 dedicated sink outputs for blue LEDs; enables RGB white balance adjustment |
| VCC | Power supply | 3.0–5.5 V digital/analog core supply; powers logic and internal references |
| GND / Thermal Pad | Power and thermal ground | Exposed thermal pad must be soldered to PCB GND plane for thermal management and noise reduction |
Key Features
| Feature | Design Value |
|---|---|
| ES-PWM with pre-charge FET | Eliminates ghosting in multiplexed LED displays by actively discharging parasitic capacitance before turn-on |
| Caterpillar cancellation circuit | Detects and compensates for LED open faults in real time to prevent vertical streak artifacts |
| LED open detection (LOD) | Configurable 4-level threshold (0.05–0.55 V) for reliable open-circuit identification per channel group |
| Poker-mode data transmission | Reduces effective GS data length (9–16 bit) to increase visual refresh rate without sacrificing low-gray fidelity |
| Auto-display repeat | Hardware-based frame auto-refresh eliminates MCU intervention during static display periods |
| Delay switching control | Prevents inrush current during line switching in multiplexed architectures via programmable timing delays |
Applications
| LED Video Displays | LED Signboards |
|---|---|
Use Scenario: High-resolution indoor/outdoor full-color video walls using 16×16 or larger RGB LED modules. IC Role / Device Role / Timing Role: Primary constant-current sink driver managing all 48 RGB sub-pixel outputs per tile; synchronizes GCLK and LAT for line-by-line scanning. Use Value: 16-bit grayscale and ES-PWM ensure smooth motion rendering and deep black levels without visible banding or ghosting. | Use Scenario: Large-format outdoor advertising signboards requiring long-term reliability under variable ambient lighting. IC Role / Device Role / Timing Role: RGB current controller with thermal shutdown and LOD for fault-tolerant operation across thousands of LEDs. Use Value: ±3% channel matching and 3-bit BC enable consistent brightness uniformity across multi-panel installations over temperature. |
| Stage Lighting Systems | Architectural LED Facades |
Use Scenario: Programmable stage lighting fixtures with dynamic color mixing and strobing effects. IC Role / Device Role / Timing Role: Real-time RGB intensity modulator using 9-bit per-color CC for precise white-point calibration and fast PWM dimming. Use Value: Poker-mode ES-PWM allows flicker-free strobe at >2 kHz while maintaining 1000+ grayscale steps for smooth transitions. | Use Scenario: Building-integrated LED facades with distributed control and environmental resilience. IC Role / Device Role / Timing Role: Distributed sink driver node in daisy-chained topology; LOD and TSD provide autonomous fault reporting. Use Value: 10 V output voltage headroom supports high-Vf UV/white LEDs; thermal pad ensures stable operation in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5947RTQR | 48-channel, 12-bit PWM only (no ES-PWM), no pre-charge FET or caterpillar cancellation | Lacks ghost/caterpillar suppression; lower grayscale depth limits low-brightness fidelity | Select when cost sensitivity outweighs artifact suppression needs in static signage |
| IS31FL3731-QFLS4 | 28-channel, 8×4 matrix with built-in oscillator; no external GCLK required; I²C interface | Smaller channel count; fixed 8-bit grayscale; no LOD or thermal shutdown | Select for compact, low-pin-count designs where daisy-chain scalability is not required |
Compared with TLC5957RTQR, TLC5947RTQR offers lower integration of display enhancement features but simpler timing, while IS31FL3731-QFLS4 trades channel count and diagnostic capability for I²C ease-of-use and self-contained operation - neither matches TLC5957RTQR's combination of 48-channel sink control, ES-PWM, and hardware-level fault mitigation.
Availability
TLC5957RTQR is available at Aetrix Electronics and suitable for LED video displays, outdoor signboards, and architectural lighting systems requiring stable component supply, long-lifecycle assurance, and production-ready thermal performance.
Supply support for TLC5957RTQR 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 high-reliability ICs for industrial, automotive, and consumer applications.
The TLC5957RTQR belongs to TI's high-performance LED driver product line, engineered specifically for demanding multiplexed RGB LED video and signage applications requiring artifact-free grayscale, robust fault detection, and thermal resilience.
FAQ
What is the maximum output current per channel for TLC5957RTQR?
The TLC5957RTQR supports a maximum sink current of 25 mA per channel when VCC = 5 V and the external IREF resistor is selected accordingly (e.g., 7.5 kΩ for 10 mA target, scaled via Equation 2). At VCC = 3.3 V, the max is 20 mA. Current is programmable across 1–25 mA using the IREF pin and BC/CC registers; knee voltage remains ≤0.24 V at 10 mA.
Does TLC5957RTQR support daisy-chaining, and how is it implemented?
Yes, TLC5957RTQR supports seamless daisy-chaining via SIN and SOUT pins. Serial data enters through SIN, shifts through the 48-bit common register on SCLK rising edges, and exits MSB-first on SOUT - which connects directly to the SIN of the next TLC5957RTQR. This enables scalable multi-driver systems without additional address lines or parallel buses.
How does the LED open detection (LOD) feature work in TLC5957RTQR?
TLC5957RTQR monitors output voltage at each color group (R/G/B) and compares it against four programmable thresholds (VLOD0–VLOD3). When an open LED causes voltage to exceed the selected threshold, the LOD flag is asserted and readable via serial interface. Thresholds range from 0.05 V to 0.55 V, allowing adaptation to different LED forward voltages and PCB trace impedances.
What is the purpose of the pre-charge FET in TLC5957RTQR?
The pre-charge FET in TLC5957RTQR actively discharges parasitic capacitance at LED anodes before turning on the main sink transistor. This eliminates ghosting - unintended partial illumination of adjacent rows/columns - especially critical in high-speed multiplexed LED video displays where row switching occurs at kHz rates.
Can TLC5957RTQR operate with both traditional PWM and ES-PWM modes?
Yes, TLC5957RTQR supports both modes via configuration register. Traditional PWM uses fixed-period, variable-duty-cycle timing. ES-PWM (Enhanced Strobe PWM) adds pre-charge and staggered switching to suppress artifacts. Mode selection is software-configurable and does not require hardware changes - both use the same GCLK and LAT signals.
TLC5957RTQR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 56-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:
- -
- Current - Output / Channel:
- 25mA
- Frequency:
- -
- Dimming:
- -
- Applications:
- Signage
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-QFN (8x8)
TLC5957RTQR FAQ
1.How can I place an order for TLC5957RTQR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5957RTQR 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 TLC5957RTQR reliable?
The price and inventory of TLC5957RTQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5957RTQR is usually 5 days.
3.What payment methods are accepted for TLC5957RTQR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5957RTQR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5957RTQR?
TLC5957RTQR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5957RTQR 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 TLC5957RTQR?
For technical support, including TLC5957RTQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5957RTQR requirements.
6.How does Aetrix verify that TLC5957RTQR is sourced from the original manufacturer or authorized distributors?
All TLC5957RTQR 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 TLC5957RTQR meets industry standards.
7.What is the process for return or replacement of TLC5957RTQR?
All TLC5957RTQR units undergo pre-shipment inspection (PSI). If there is an issue with TLC5957RTQR, 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 TLC5957RTQR part is unused and in its original packaging.
Return procedure for TLC5957RTQR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLC5957RTQR Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
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