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Texas Instruments TLC59482DBQR
- Part No.:
- TLC59482DBQR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
TLC59482DBQR.pdf
- Description:
- IC LED DRIVER LINEAR 45MA 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,288
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Product details
Overview
TLC59482DBQR from Texas Instruments is a 16-channel, 16-bit PWM LED driver with 6-bit global brightness control, constant-current sink outputs (1–45 mA), 33 MHz grayscale clock support, and daisy-chain serial interface - used in high-fidelity LED video displays requiring precise grayscale uniformity and thermal stability across industrial ambient ranges.
For engineers reviewing the TLC59482DBQR datasheet, TLC59482DBQR pinout, TLC59482DBQR application, or TLC59482DBQR equivalent, key selection criteria include channel-to-channel current accuracy (±1% typ), 65,536-step grayscale resolution, IREF-set current programming, GSCLK timing constraints, and SSOP-24 package thermal performance for dense LED matrix layouts.
Technical Context
The TLC59482DBQR implements a three-stage grayscale data latch architecture synchronized to GSCLK, enabling Enhanced Spectrum (ES) PWM with 128 display segments and variable on-time distribution per channel. Its internal 16-bit GS counter increments on each GSCLK rising edge and resets via TMGRST or LATGS commands with XRFRESH=1.
Global brightness control operates independently via a 6-bit register that scales all 16 output currents linearly from 0% to 100% of the IREF-defined maximum. Four-grouped delay switching prevents inrush current during display updates, and auto data refresh maintains stable output without host intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 16 constant-current sink outputs (OUT0–OUT15), individually PWM-controlled |
| Grayscale resolution | 16-bit (65,536 steps) per channel, enabling fine luminance gradation in LED signage |
| Global brightness control | 6-bit (64 steps), 0%–100% linear scaling of all channels simultaneously |
| Sink current range | 1–35 mA (VCC ≤3.6 V) or 1–45 mA (VCC >3.6 V), set by external RIREF resistor |
| Timing clocks | SCLK up to 30 MHz; GSCLK up to 33 MHz - defines max update rate and grayscale fidelity |
| Current accuracy | Channel-to-channel ±1% (typ), device-to-device ±2% (typ) - critical for color-matched LED arrays |
| Operating temperature | –40°C to +85°C ambient - validated for outdoor LED displays and industrial enclosures |
Pinout & Package
Package: SSOP-24 (DBQ), 0.635 mm pitch, exposed thermal pad (not internally connected to GND; must be externally tied to PCB ground plane).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1, 22) | Power ground reference | Primary return path for all sink currents and logic; thermal pad must connect to PCB GND for thermal management |
| VCC (Pin 24) | Supply voltage input | 3.0–5.5 V digital/analog supply; powers logic core and current sinks |
| IREF (Pin 23) | Reference current terminal | Resistor (RIREF) from IREF to GND sets full-scale sink current; 1.20 V internal reference enables precise current programming |
| LAT (Pin 4) | Data latch strobe | Falling edge latches 16-bit shift register contents into GS/BC/FC latches; internal 500 kΩ pull-down ensures defined state at power-up |
| SIN (Pin 2) | Serial data input | Feeds 256-bit GS data (16×16), 6-bit BC, or FC command into 16-bit common shift register on SCLK rising edges |
| SCLK (Pin 3) | Serial clock input | Drives data shift; supports 30 MHz max - determines GS data load time (≤8.5 µs for full 256 bits) |
| GSCLK (Pin 21) | Grayscale PWM clock | Rising edge increments GS counter; 33 MHz max defines minimum PWM period (30.3 ns) and max grayscale frame rate |
| SOUT (Pin 22) | Serial data output | MSB of shift register; enables daisy-chaining and READFC command for function register readback |
| OUT0–OUT15 (Pins 5–20) | Constant-current sink outputs | Each drives one LED cathode; supports parallel connection for higher current; VOUT up to 10 V compliance |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced Spectrum (ES) PWM | Distributes on-time across 128 display segments to reduce visible flicker and improve EMI profile in large-area LED walls |
| Auto display repeat & refresh | Eliminates host CPU polling; maintains stable LED output indefinitely after initial GS data load |
| Four-grouped delay switching | Sequences OUT0–OUT15 activation in four staggered groups to limit peak inrush current during frame transitions |
| Display timing reset (TMGRST) | Hardware-synchronized GS counter reset via GSCLK edge - ensures deterministic frame alignment across daisy-chained devices |
| Function control data latch | Stores BC, XRFRESH, TMRSTEN, LATMODE, and XRST bits - enables runtime reconfiguration without full reinitialization |
Applications
| LED Video Displays | LED Signboards |
|---|---|
Use Scenario: High-resolution indoor/outdoor video walls with >10,000 LEDs per panel, requiring uniform grayscale and thermal drift compensation. IC Role / Device Role / Timing Role: Primary grayscale PWM controller; provides 16-bit per-channel dimming synchronized to GSCLK and LAT for frame-accurate updates. Use Value: ±1% channel-to-channel current matching ensures pixel-level color consistency; ES PWM minimizes temporal aliasing in motion video. | Use Scenario: Dynamic roadside message signs operating continuously in –40°C to +85°C environments with solar loading. IC Role / Device Role / Timing Role: Constant-current LED driver with global brightness scaling; uses BC register to adjust daytime/nighttime luminance without firmware change. Use Value: 6-bit BC enables 64-step ambient-adaptive dimming; 45 mA max sink current drives high-brightness AlInGaP LEDs at full intensity. |
| Architectural Lighting Systems | Industrial HMI Panels |
Use Scenario: RGBW LED strips in commercial buildings where smooth 16-bit dimming and low flicker are mandated by lighting standards. IC Role / Device Role / Timing Role: PWM sink driver for individual color channels; leverages daisy-chain SOUT/SIN to minimize MCU GPIO usage across long LED runs. Use Value: 65,536 grayscale steps enable CIE-compliant smooth dimming curves; thermal pad design sustains 85°C ambient operation. | Use Scenario: Operator interface panels in factory automation with status indicators requiring long-term current stability and EMC robustness. IC Role / Device Role / Timing Role: LED current source with integrated timing control; uses auto-refresh to maintain indicator states during host processor sleep cycles. Use Value: ±2% device-to-device current matching ensures consistent indicator brightness across multiple panels; 30 MHz SCLK allows rapid configuration updates during diagnostics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5947RTQT | 16-channel, 12-bit PWM (4096 steps); no global brightness control; QFN-24 package; 30 MHz SCLK max | Lacks 6-bit BC register and ES PWM; suited for cost-sensitive, lower-fidelity LED arrays | Select when 12-bit grayscale suffices and BC adjustment is handled externally |
| IS31FL3728-QFLS4-TR | 18-channel, 16-bit PWM; integrated 32 MHz oscillator; I²C interface; QFN-28 package; no daisy-chain capability | Requires I²C master; no GSCLK/LAT pins; fixed internal clock eliminates timing jitter but reduces flexibility | Select for simplified layout with I²C-only systems and no need for multi-device synchronization |
Compared with TLC59482DBQR, TLC5947RTQT trades grayscale depth and BC control for lower cost and smaller footprint, while IS31FL3728-QFLS4-TR replaces serial daisy-chaining with I²C addressing and removes external clock dependency - making it suitable for distributed, non-synchronized LED nodes.
Availability
TLC59482DBQR is available at Aetrix Electronics and suitable for LED video displays, architectural lighting systems, and industrial HMI panels requiring stable component supply, long-term manufacturability, and guaranteed TI production continuity.
Supply support for TLC59482DBQR 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 over 50 years of innovation in precision analog ICs.
The TLC59482 belongs to TI's high-accuracy LED driver product line, engineered for applications demanding tight current matching, wide grayscale resolution, and robust thermal performance in demanding visual display environments.
FAQ
What is the maximum sink current per channel for TLC59482DBQR and how is it set?
The TLC59482DBQR supports a maximum sink current of 1–35 mA when VCC ≤3.6 V, or 1–45 mA when VCC >3.6 V. This value is set by an external resistor (RIREF) connected between the IREF pin and GND. The internal 1.20 V reference at IREF determines current using IOLCMax = 39.8 mA × (1.20 V / RIREF). For example, a 1.5 kΩ resistor yields ~31.8 mA per channel at 25°C.
How does the Enhanced Spectrum (ES) PWM mode in TLC59482DBQR reduce visible flicker?
The TLC59482DBQR implements ES PWM by dividing the full grayscale period into 128 display segments and distributing the 16-bit on-time across them non-uniformly. Instead of concentrating all on-time in one segment (causing low-frequency ripple), ES spreads activation events - reducing beat frequencies with AC mains and minimizing perceptible flicker in peripheral vision, especially critical for large-format video walls.
Can TLC59482DBQR be daisy-chained, and what pins enable this functionality?
Yes, the TLC59482DBQR supports daisy-chaining via its SIN and SOUT pins. Serial data is shifted in through SIN on SCLK rising edges, and the MSB appears at SOUT on the next SCLK edge. Multiple devices are connected SOUT→SIN, with shared SCLK, LAT, GSCLK, and VCC/GND. This allows cascading up to dozens of TLC59482DBQRs using only four MCU pins - essential for scalable LED matrix designs.
What is the role of the LAT pin in TLC59482DBQR operation, and what happens if it is left floating?
The LAT pin is a latching strobe: its falling edge transfers data from the 16-bit common shift register into the selected destination (GS data latch, BC latch, or function control latch). It has an internal 500 kΩ pull-down resistor, so if left floating, LAT remains low - preventing unintended latching. However, reliable operation requires active driving; floating LAT may cause metastability during noise events, risking corrupted GS data writes.
Does TLC59482DBQR support reading back configuration registers, and how is this accomplished?
Yes, the TLC59482DBQR supports reading back the function control (FC) data latch using the READFC command. When issued, subsequent SCLK rising edges clock out the 16-bit FC register (containing BC, XRFRESH, TMRSTEN, LATMODE, and XRST bits) via SOUT. This enables runtime verification of global brightness settings and operational mode - critical for fault-tolerant LED systems requiring configuration integrity checks.
TLC59482DBQR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm 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:
- 45mA
- Frequency:
- -
- Dimming:
- -
- Applications:
- Signage
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
TLC59482DBQR FAQ
1.How can I place an order for TLC59482DBQR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC59482DBQR 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 TLC59482DBQR reliable?
The price and inventory of TLC59482DBQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC59482DBQR is usually 5 days.
3.What payment methods are accepted for TLC59482DBQR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC59482DBQR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC59482DBQR?
TLC59482DBQR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC59482DBQR 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 TLC59482DBQR?
For technical support, including TLC59482DBQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC59482DBQR requirements.
6.How does Aetrix verify that TLC59482DBQR is sourced from the original manufacturer or authorized distributors?
All TLC59482DBQR 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 TLC59482DBQR meets industry standards.
7.What is the process for return or replacement of TLC59482DBQR?
All TLC59482DBQR units undergo pre-shipment inspection (PSI). If there is an issue with TLC59482DBQR, 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 TLC59482DBQR part is unused and in its original packaging.
Return procedure for TLC59482DBQR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLC59482DBQR Tags
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