LD1074
16-Channel Constant Current LED Driver With 16-Bit PWM Control and Dot-Correction
LD1074
LD1074
16-Channel Constant Current LED Driver
With 16-bit PWM Control and Dot-Correction
Ver. 1.1 / Jul. 2013
This document is a general product description and is subject to change without notice.
LDT Inc. does NOT assume any responsibility for use of circuits described.
1
LDT Inc.
WE bldg. 5F, 126-33 Han-dle 1ro, Seobuk-gu, Cheonan, Chungnam, korea, 331-220
Tel. +82 41 520 7300 Fax. +82 41 520 7337
www.ldt.co.kr
Ver 1.1
LD1074
16-Channel Constant Current LED Driver With 16-Bit PWM Control and Dot-Correction
Description
LD1074 is a 16-channel constant current LED driver with selectable 16-/12-bit gray scale control and 8-bit pixel
correction. LD1074 provides constant current ranging from 2mA to 60mA for each output channel. The output
current can be set by an external resistor. LD1074 adopts open/short error detection, thermal detection, and external
resistor connection and adjusts current gain control for brightness.
Features
16 constant-current output channels
Constant output current range per channel: 2~60mA ( 2~60mA @ 5V, 2~45mA @ 3.3V )
Excellent output current accuracy,
-
Between channels: <±1.0% (typ.);
- Between ICs: <±1.5% (typ.)
Visual effect control
- Increased refresh rate
- selectable gray scale (16bit or 12bit)
- Individual pixel-correction (256 steps : 8-bit control)
- Brightness control (7-bit linear programmable output current gain)
Error detection control
- Individual LED Open/Short-circuit detection
- External Resistor Detection (R-EXT pin Open Detection)
- Thermal protection ( Alarm & Shut-Down)
EMI reduction
- Delay between output channels.
- Fast / Slow output switching Speed
Maximum gray scale clock frequency: 33MHz
Application
Full-color LED display
VMS (Variable Message Sign)
2
LDT Inc.
WE bldg. 5F, 126-33 Han-dle 1ro, Seobuk-gu, Cheonan, Chungnam, korea, 331-220
Tel. +82 41 520 7300 Fax. +82 41 520 7337
www.ldt.co.kr
Ver 1.1
LD1074
16-Channel Constant Current LED Driver With 16-Bit PWM Control and Dot-Correction
Pin Configuration
R-EXT
GCLK
DCLK
SDO
OUT15
OUT14
OUT13
OUT12
OUT11
OUT10
17
16
15
14
7
OUT9
8
13
9 10 11 12
OUT7
GND
OUT6
OUT5
VDD
SDI
GND 1
SDI 2
DCLK 3
LE 4
OUT0 5
OUT1 6
OUT2 7
OUT3 8
OUT4 9
OUT5 10
OUT6 11
OUT7 12
24
23
22
21
20
19
18
17
16
15
14
13
VDD
R-EXT
SDO
GCLK
OUT15
OUT14
OUT13
OUT12
OUT11
OUT10
OUT9
OUT8
LE
OUT0
OUT1
OUT2
OUT3
OUT4
1
2
3
4
5
6
24 23 22 21 20 19
18
OUT8
SSOP/TSSOP
GFN
Terminal Description
Pin Name
GND
SDI
DCLK
LE
OUT0~OUT15
Function
Ground terminal for control logic and current sink
Serial data input to the shift register
Clock input terminal used to shift data on rising edge and carries command information when
LE is asserted.
Data strobe terminal and controlling command with DCLK
Constant current output terminals
Gray scale clock terminal
Clock input for gray scale. The gray scale display is counted by gray scale clock comparing
with input data.
Serial data output to the SDI of next driver IC
Input terminal used to connect an external resistor for setting up output current for all output
channels
3.3V/5V supply voltage terminal
3
LDT Inc.
WE bldg. 5F, 126-33 Han-dle 1ro, Seobuk-gu, Cheonan, Chungnam, korea, 331-220
Tel. +82 41 520 7300 Fax. +82 41 520 7337
www.ldt.co.kr
Ver 1.1
GCLK
SDO
R-EXT
VDD
LD1074
16-Channel Constant Current LED Driver With 16-Bit PWM Control and Dot-Correction
Block Diagram
OUT14
OUT15
OUT0
R-EXT
I
o
Regulator
34
-bit error status
Thermal Detector
Error Detector
OUT1
Comparators
Comparators
Comparators
Comparators
GCLK
16bit/12bit
Counter
16
16
16
Buffers
16
LE
SYNC
Control
Configuration
Register
Gray Scale Pixel
Gray Scale Pixel
Gray Scale Pixel
Gray Scale Pixel
34
GND
16
16
8-bit Dot Correction
SDI
DCLK
256-bit Shift Register (FIFO)
SDO
4
LDT Inc.
WE bldg. 5F, 126-33 Han-dle 1ro, Seobuk-gu, Cheonan, Chungnam, korea, 331-220
Tel. +82 41 520 7300 Fax. +82 41 520 7337
www.ldt.co.kr
Ver 1.1
LD1074
16-Channel Constant Current LED Driver With 16-Bit PWM Control and Dot-Correction
Equivalent Circuits of Inputs and Outputs
GCLK, DCLK, SDI terminal
LE terminal
SDO terminal
Maximum Rating
Characteristic
Supply Voltage
Input Pin Voltage (SDI)
Output Current
Sustaining Voltage at OUT Port
GND Terminal Current
SSOP24
Power Dissipation
(On PCB, Ta=25°C)
TSSOP24
QFN24
SSOP24
Thermal Resistance
(On PCB, Ta=25°C)
Empirical Thermal
Resistance
(Ta=25°C)
Operating Temperature
Storage Temperature
TSSOP24
QFN24
SSOP24
TSSOP24
QFN24
T
opr
T
stg
R
th(j-a)
P
D
Symbol
V
DD
V
IN
I
OUT
V
DS
I
GND
Rating
0~7
-0.4~V
DD
+0.4
+80
-0.5~5.5
+1280
2.52
3.53
3.13
49.69
35.45
40.01
78.83
89.11
94.25
-40~+85
-55~+150
˚C
˚C
5
LDT Inc.
WE bldg. 5F, 126-33 Han-dle 1ro, Seobuk-gu, Cheonan, Chungnam, korea, 331-220
Tel. +82 41 520 7300 Fax. +82 41 520 7337
www.ldt.co.kr
Ver 1.1
˚C/W
W
Unit
V
V
mA
V
mA
京公网安备 11010802033920号
EEWORLD
