SINK DRIVERS. TLC5926 Datasheet

TLC5926 DRIVERS. Datasheet pdf. Equivalent

TLC5926 Datasheet
Recommendation TLC5926 Datasheet
Part TLC5926
Description 16-CHANNEL CONSTANT-CURRENT LED SINK DRIVERS
Feature TLC5926; TLC5926, TLC5927 www.ti.com ........................................................................
Manufacture etcTI
Datasheet
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Texas Instruments TLC5926
TLC5926, TLC5927
www.ti.com ....................................................................................................................................................................................................... SLVS677 – JULY 2008
16-CHANNEL CONSTANT-CURRENT LED SINK DRIVERS
FEATURES
1
2 16 Constant-Current Output Channels
Output Current Adjusted By External Resistor
Constant Output Current Range: 5 mA to
120 mA
Constant Output Current Invariant to Load
Voltage Change
Open-Load, Shorted-Load and
Overtemperature Detection
256-Step Programmable Global Current Gain
Excellent Output-Current Accuracy:
– Between Channels: < ±6% (Max),
10 mA to 50 mA
– Between ICs: < ±6% (Max), 10 mA to 50 mA
30-MHz Clock Frequency
Schmitt-Trigger Input
3.3-V or 5-V Supply Voltage
Thermal Shutdown for Overtemperature
Protection
ESD Performance: 2-kV HBM
APPLICATIONS
General LED Lighting Applications
LED Display Systems
LED Signage
Automotive LED Lighting
White Goods
DESCRIPTION/ORDERING INFORMATION
The TLC5926/TLC5927 is designed for LED displays and LED lighting applications with open-load, shorted-load,
and overtemperature detection, and constant-current control. The TLC5926/TLC5927 contains a 16-bit shift
register and data latches, which convert serial input data into parallel output format. At the TLC5926/TLC5927
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), TLC5926/TLC5927 provides great flexibility and device performance. Users can adjust the output
current from 5 mA to 120 mA through an external resistor, Rext, which gives flexibility in controlling the light
intensity of LEDs. TLC5926/TLC5927 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.
The TLC5926/TLC5927 provides a Special Mode in which two functions are included, Error Detection and
Current Gain Control. In the TLC5926/TLC5927 there are two operation modes and three phases: Normal Mode
phase, Mode Switching transition phase, and Special mode phase. The signal on the multiple-function pin
OE(ED2) is monitored, and when an one-clock-wide short pulse appears on OE(ED2), TLC5926/TLC5927 enters
the Mode Switching phase. At this time, the voltage level on LE(ED1) determines the next mode into which the
TLC5926/TLC5927 switches.
In the Normal Mode phase, the serial data is transferred into TLC5926/TLC5927 via SDI, shifted in the shift
register, and transferred out via SDO. LE(ED1) can latch the serial data in the shift register to the output latch.
OE(ED2) enables the output drivers to sink current.
In the Special Mode phase, the low-voltage-level signal OE(ED2) can enable output channels and detect the
status of the output current, to tell if the driving current level is enough or not. The detected error status is loaded
into the 16-bit shift register and shifted out via SDO, along with the CLK signal. The system controller can read
the error status to determine whether or not the LEDs are properly lit. In the Special Mode phase,
TLC5926/TLC5927 also allows users to adjust the output current level by setting a runtime-programmable
Configuration Code. The code is sent into TLC5926/TLC5927 via SDI. The positive pulse of LE(ED1) latches the
code in the shift register into a built-in 8-bit configuration latch, instead of the output latch. The code affects the
voltage at R-EXT and controls the output-current regulator. The output current can be adjusted finely by a gain
ranging from 1/12 to 127/128 in 256 steps. Therefore, the current skew between ICs can be compensated within
less than 1%, and this feature is suitable for white balancing in LED color-display panels.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerPAD is a trademark of Texas Instruments.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008, Texas Instruments Incorporated



Texas Instruments TLC5926
TLC5926, TLC5927
SLVS677 – JULY 2008 ....................................................................................................................................................................................................... www.ti.com
TA
–40°C to 85°C
ORDERING INFORMATION(1)
PACKAGE (2)
ORDERABLE PART NUMBER
PowerPAD™ – PWP Reel of 2000
TLC5926IPWPR
TLC5927IPWPR
W-SOIC – DW
Reel of 2000
TLC5926IDWR
TLC5927IDWR
SSOP – DBQ
Reel of 2000
TLC5926IDBQR
TLC5927IDBQR
TOP-SIDE MARKING
Y5926
Y5927
TLC5926I
TLC5927I
TLC5926I
TLC5927I
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
(2) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
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
8
16
16-BIT SHIFT
REGISTER
SDO
16
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Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): TLC5926 TLC5927



Texas Instruments TLC5926
TLC5926, TLC5927
www.ti.com ....................................................................................................................................................................................................... SLVS677 – JULY 2008
DBQ, DW, OR PWP PACKAGE
(TOP VIEW)
GND
SDI
CLK
LE(ED1)
OUT0
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
1
2
3
4
5
6
7
8
9
10
11
12
24 VDD
23 R-EXT
22 SDO
21 OE(ED2)
20 OUT15
19 OUT14
18 OUT13
17 OUT12
16 OUT11
15 OUT10
14 OUT9
13 OUT8
PIN NAME
CLK
GND
LE(ED1)
OE(ED2)
OUT0–OUT15
R-EXT
SDI
SDO
VDD
Pin Descriptions
DESCRIPTION
Clock input pin for data shift on rising edge
Ground pin for control logic and current sink
Data strobe input pn
Serial data is transferred to the respective latch when LE(ED1) is high. The data is latched when LE(ED1) goes low.
Also, a control signal input for an Error Detection mode and Current Adjust mode (See Timing Diagram). LE(ED1) has
an internal pulldown.
Output enable pin. When OE (ED2)(active) is low, the output drivers are enabled; when OE(ED2) is high, all output
drivers are turned OFF (blanked). Also, a control signal input for an Error Detection mode and Current Adjust mode
(See Timing Diagram). OE(ED2) has an internal pull-up.
Constant-current output pins
Input pin used to connect an external resistor for setting up all output currents
Serial-data input to the Shift register
Serial-data output to the following SDI of next driver IC or to the microcontroller
Supply voltage pin
Diagnostic Features
DEVICE (1)
TLC5926
TLC5927
OPEN-LOAD
DETECTION
x
x
SHORT TO GND
DETECTION
x
x
SHORT TO VLED
DETECTION
x
(1) The device has one single error register for all these conditions (one error bit per channel)
Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): TLC5926 TLC5927
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