24-Ch 12-Bit PWM LED Driver w/7-Bit Dot Correction 8-Bit Global Brightness - TLC5951

TLC5951 (ACTIVE)

24-Ch 12-Bit PWM LED Driver w/7-Bit Dot Correction 8-Bit Global Brightness

Description

The TLC5951 is a 24-channel, constant-current sink driver. Each channel has an individually-adjustable, 4096-step, pulse width modulation (PWM) grayscale (GS) brightness control and 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 TLC5951 has three error detection circuits for LED open detection (LOD), LED short detection (LSD), and thermal error flag (TEF). LOD detects a broken or disconnected LED while LSD detects a shorted LED. TEF indicates an over-temperature condition.

Features

  • 24-Channel Constant-Current Sink Output
  • Current Capability: 40 mA
  • 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
  • Dot Correction (DC): 7-Bit (128 Step)
  • Global Brightness Control (BC) for Each Color Group: 8-Bit (256 Step)
  • Auto Display Repeat Function
  • Independent Data Port for GS and BC/DC Data
  • Communication Path Between Each Data Port
  • LED Power-Supply Voltage up to 15 V
  • VCC = 3.0 V to 5.5 V
  • Constant-Current Accuracy:
    • Channel-to-Channel = ±1.5%
    • Device-to-Device = ±3%
  • CMOS Logic Level I/O
  • Data Transfer Rate: 30 MHz
  • 33-MHz 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
  • Operating Air Temperature: –40°C to +85°C
  • Packages: HTSSOP-38, QFN-40

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Parametrics Compare all products in Signage/Linear

 
Data Vin (Min) (V)
Data Vin (Max) (V)
Output Channels
Analog Dimming Steps
Data Input
Data Transfer Rate (Typ) (MHz)
Ch to Ch Accuracy (Typ) (+/- %)
Per Channel PWM Steps
Per Channel Drive (mA)
LED Voltage (Max) (V)
Special Features
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
TLC5951 TLC5947 TLC5952
3     3     3    
5.5     5.5     5.5    
24     24     24    
256       128    
Serial     Serial     Serial    
30     30     35    
1.5     2     1    
4096     4096      
40     30     35    
15     30     15    
Fault Reporting
LED Open Detection
Power Good/Error Flag
Thermal Shutdown    
Internal GS Clock
Thermal Shutdown    
Fault Reporting
LED Open Detection
Power Good/Error Flag
Thermal Shutdown    
Catalog     Catalog     Catalog    
-40 to 85     -40 to 85     -40 to 85    
38HTSSOP
40VQFN    
32HTSSOP
32VQFN    
32HTSSOP    
1.55 | 1ku     1.95 | 1ku     1.35 | 1ku    

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