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Texas Instruments TLC5951 24-Channel Constant-Current Sink Driver

Texas Instruments TLC5951 24-Channel Constant-Current Sink Driver comes with each channel having an individually-adjustable, 4096-step, pulse-width modulation (PWM) grayscale (GS) brightness control. The device also includes a 128-step constant-current dot correction (DC). The dot correction adjusts brightness deviation between channels and other LED drivers. The output channels are grouped into three groups of eight channels. Each channel group has a 256-step global brightness control (BC) function and an individual grayscale clock input. GS, DC, and BC data are accessible via a serial interface port. DC and BC can be programmed via a dedicated serial interface port.

The Texas Instruments TLC5951 device has three error-detection circuits for LED-open detection (LOD), LED-short detection (LSD), and a thermal error flag (TEF). LOD detects a broken or disconnected LED, LSD detects a shorted LED, and TEF indicates an overtemperature condition.

Features

  • 24-channel constant-current sink output
  • 40mA current capability 
  • Selectable Grayscale (GS) control with PWM (12-bit (4096 step), 10-bit (1024 step), 8-bit (256 step))
  • Three independent Grayscale clocks for three color groups
  • 7-bit (128 step) Dot Correction (DC) 
  • 8-bit (256 step) Global Brightness Control (BC) for each color group 
  • Auto display repeat function
  • Independent data port for GS, BC, and DC data
  • A communication path between each data port
  • LED power-supply voltage up to 15V
  • VCC = 3V to 5.5V
  • Constant-current accuracy
    • Channel-to-channel = ±1.5%
    • Device-to-device = ±3%
  • CMOS logic level I/O
  • 30MHz data transfer rate 
  • 33MHz Grayscale control clock
  • Continuous base LED-Open Detection (LOD)
  • Continuous base LED-Short Detection (LSD)
  • Thermal Shutdown (TSD) with auto restart
  • Grouped delay to prevent inrush current
  • –40°C to 85°C operating ambient temperature 
  • HTSSOP-38, QFN-40 packages

Applications

  • Full-color LED displays
  • LED signboards

Typical Application Circuit

Application Circuit Diagram - Texas Instruments TLC5951 24-Channel Constant-Current Sink Driver
Publicado: 2018-04-25 | Actualizado: 2022-12-08