TLC5926_15 Datasheet, PDF (13/39 Pages) Texas Instruments – 16-Channel Constant-Current LED Sink Drivers

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9 Detailed Description
TLC5926, TLC5927
SLVS677C – JULY 2008 – REVISED OCTOBER 2015
9.1 Overview
The TLC592x is designed for LED displays and LED lighting applications with open-load, shorted-load, and
overtemperature detection, and constant-current control. The TLC592x contains a 16-bit shift register and data
latches, which convert serial input data into parallel output format. At the TLC592x output stage, 16 regulated-
current ports provide uniform and constant current for driving LEDs within a wide range of VF (Forward Voltage)
variations. Used in systems designed for LED display applications (e.g., LED panels), TLC592x 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. TLC592x is 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 OUT14 OUT15
R-EXT
I/O REGULATOR
VDD
OE(ED2)
LE(ED1)
CONTROL
LOGIC
8
OUTPUT DRIVER and
ERROR DETECTION
16
16
16-BIT OUTPUT
LATCH
CLK
SDI
CONFIGURATION
LATCHES
16
8
16-BIT SHIFT
REGISTER
SDO
16
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 TLC592x 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.
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Product Folder Links: TLC5926 TLC5927
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