TLC5916-Q1_16 Datasheet, PDF (15/34 Pages) Texas Instruments – 8-Bit Constant-Current LED Sink Drivers

www.ti.com
9 Detailed Description
TLC5916-Q1, TLC5917-Q1
SLVS814A – JANUARY 2008 – REVISED MAY 2015
9.1 Overview
The TLC591x-Q1 is designed for LED displays and LED lighting applications with constant-current control and
open-load, shorted-load, and overtemperature detection. The TLC591x-Q1 contains an 8-bit shift register and
data latches, which convert serial input data into parallel output format. At the output stage, eight regulated
current ports are designed to provide uniform and constant current for driving LEDs within a wide range of VF
variations. Used in system design for LED display applications, for example, LED panels, the TLC591x-Q1
device provides great flexibility and device performance. Users can adjust the output current from 5 mA to 120
mA through an external resistor, R-EXT, which gives flexibility in controlling the light intensity of LEDs. The
devices are designed for up to 17 V at the output port. The high clock frequency, 30 MHz, also satisfies the
system requirements of high-volume data transmission.
9.2 Functional Block Diagram
OUT0 OUT1 OUT6 OUT7
R-EXT
I/O Regulator
OE(ED2)
LE(ED1)
VDD
Control
Logic
8
Output Driver and
Error Detection
8
8
8-Bit Output
Latch
CLK
SDI
Configuration
Latches
8
8
8-Bit Shift
Register
SDO
8
9.3 Feature Description
9.3.1 Open-Circuit Detection Principle
The LED Open-Circuit Detection compares the effective current level I_out with the open load detection threshold
current I_OUT,Th. If I_OUT is below the I_OUT,Th threshold, the TLC591x-Q1 detects an open-load condition. This error
status can be read as an error status code in the Special mode. For open-circuit error detection, a channel must
be on.
Copyright © 2008–2015, Texas Instruments Incorporated
Submit Documentation Feedback
15
Product Folder Links: TLC5916-Q1 TLC5917-Q1