TLC6948 16-Channel, 16-bit ES-PWM constant-current LED driver | TI.com

TLC6948 (ACTIVE)

16-Channel, 16-bit ES-PWM constant-current LED driver

 

Description

In high-density, fine-pitch LED panel applications, the performance demand for multi-channel LED drivers is increasing to achieve high multiplexing, high PWM resolution, and high refresh rates. To meet strict display quality requirements, the LED drivers must have the ability to solve various issues in different LED-matrix application scenarios.

The TLC694x device is a 16-channel, constant-current-sink LED driver. Each channel has an individually adjustable 65,536 steps of PWM grayscale control. The maximum constant-current value of all 16 channels is set by a single external resistor with 128 steps of global brightness control from 0.3 mA to 25 mA.

The TLC694x device integrates enhanced circuits to solve the various display issues in fine-pitch LED display applications: the low-grayscale uniformity issue, coupling issue, ghosting issue, and caterpillar issue.

The TLC694x device features an LED-open detection function, and the error detection results can be read via a serial data interface port. Thermal shutdown and IREF resistor short protection ensure a higher system reliability. The TLC694x device also has an smart power-save mode that sets the total current consumption to 1 mA (typical) when all outputs are off.

Features

  • Power Supply Voltage Ranges
    • VCC Voltage Range: 3 V to 5.5 V
    • VLED Voltage Range: Up to VCC + 0.3 V
  • 16 Constant-Current-Sink Channels
    • 0.3 mA to 25 mA (3 V ≤ VCC ≤ 5.5 V)
    • Channel Current Deviation: ±1% (typical)
    • Device Current Deviation: ±1% (typical)
    • Low Knee Voltage: 0.3 V (typical) at 10 mA
  • 7-Bit (128 Steps) Global Brightness Control (BC)
  • 16-Bit (65,536 Steps) Enhanced Spectrum PWM Grayscale Control
  • Built-In Memory Supports 32 Multiplexing for TLC6946 and 48 Multiplexing for TLC6948
  • LED Display Performance Enhancement
    • Low-Grayscale Uniformity Improvement
    • Low-Grayscale Coupling Issue Elimination
    • Ghosting Removal and Caterpillar Elimination
  • High-Speed Serial-Data Interface
    • Data-Shift Clock: 33 MHz (maximum)
    • Grayscale Control Clock: 33 MHz (maximum)
    • Supports Dual-Edge Grayscale Control
  • Diagnostics and Protection
    • LED-Open Detection (LOD)
    • IREF Resistor Short Protection (ISP)
    • Thermal Shutdown (TSD)
  • Smart Power-Save Mode

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Parametrics

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Part number Order Features Analog dimming steps Data transfer rate (Typ) (MHz) Ch to ch accuracy (Typ) (+/- %) Package Group Package size: mm2:W x L (PKG) Rating Operating temperature range (C)
TLC6948 Order now Fault Detection
LED Open Detection
PWM LED Driver
Pre-Charge FET
Thermal Shutdown    
128     33     1.5     SSOP | 24
VQFN | 24    
24SSOP: 52 mm2: 6 x 8.65 (SSOP | 24)
24VQFN: 16 mm2: 4 x 4 (VQFN | 24)    
Catalog     -40 to 85    
TLC6946 Samples not available Fault Detection
LED Open Detection
PWM LED Driver
Pre-Charge FET
Thermal Shutdown    
128     33     1.5     SSOP | 24
VQFN | 24    
24SSOP: 52 mm2: 6 x 8.65 (SSOP | 24)
24VQFN: 16 mm2: 4 x 4 (VQFN | 24)    
Catalog     -40 to 85