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Greeled Electronic Ltd
INK1003 IC (256-Gray Level)
Data Sheet Of INK1003 IC Driver
Characteristics
Applications
z 3-Channel constant current LED driver.
z Output current won’t vary with the driving z LED decorative lighting
output voltage.
z Digital Dream Color Led Strip Light
z Wide operating voltage:3.3~5.4V
z Indoor/Outdoor LED video or massage display
z High gray level, 256 gray levels.
z PWM signal generator
z Polarity reverse function makes INK1003 z All kinds of LED point light source
suitable for high power full color LED
z LED strips operate between 5~12V
lighting.
z Low output current deviation:
Between channels in a single chip: ±1 %
Between chips: ±3%
z Data frequency range wide: 400~800KHz
z Schmitt trigger input
z High reliability, ESD susceptibility high:
HBM 8KV
Greeled Electronic LtdGeneralDescription
INK1003 is a constant current LED driver. It is a single line 3-Channel 256 Grey Level Driver.It is
designed for indoor/ outdoor LED displays and decorative LED lighting system. It is suitable for LED
cascading applications. The INK1003 owns 3 output channels, each channel can sink 18.6mA constant
current. INK1003 contains single line data transceiver decoder, data latches, output registers, band gap
reference voltage generator, internal oscillator, and low saturation constant current sinks. The data received
by INK1003 is decoded and then the decoded data is transferred in to the gray level comparator. The output of
the gray level comparator controls the constant output current.
The output polarity reverse function is designed for driving high power LED by adapting the application
circuitry. The single line control scheme reduces the engineering troubles mostly, the special designed input
and output staged of INK1003, make INK1003 survive during output and input pin short with power source or
GND. When 800KHz, it can achieve 1024Pixels cascade connection.
INK1003 is available in both SOP-8 and DIP-8 packages, the operating temperature is -40~85.
  PIN CONFIGURATION
  TYPICAL APPLICATION CIRCUIT
Fig1 SOP-8
 
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Absolute Maximum Ratings
INK1003 IC (256-Gray Level)
Parameter
Symbol
Ratings
Unit
Power Supply Voltage
Input Voltage
Output Pin Voltage
Driver PIN voltage
Output current
VCC
VIN
VOUT
VXOUT
VXOUT
IOUTCC
-0.3 to 6V
-0.3 to VCC+0.3V
-0.3 to VCC+0.3V
-0.3 to 10VIOUT off
-0.3 to 5V
18
V
V
V
V
V
mA
Output Current Deviation (Constant Current Driving Mode)
Between output channels
Between chips
DIOI
DIOE
±1
±3
%
Input Clock Frequency
FCLK 800 KHz
Maximum Power Dissipation
PD
1200
mW
Operating Junction Temperature
Topr
-40 to + 150
Storage Temperature Range
Tstg
-55 to + 150
ESD susceptibility
8000
V
Greeled Electronic LtdNote: If the voltage on the pins exceeds the maximum ratings may cause permanent damage to the device.
Electrical Parameters (VCC=5V, TA= 25, specified otherwise.)
Parameter
VCC range
Output voltage
Symbol
VCC
VOUT
IoutH
Conditions
IOUT=1uA
VXOUT=2V
Min Typ Max Units
3 -- 5
V
-0.3 --
10
V
17 -- 19 mA
Output Current
IoutL Output=HIGH,
VOUT=10V
--
1 10 uA
ISOURCE Other output
-- 1 -- mA
ISINK Other output
-- -1 -- mA
Quiescent Current
ISTB
-- 1000 1600 μA
VCC clamp voltage
Minimum constant
output time
Input current
Input voltage level
current
VCCCLAMP
IOH
IIN
VIH
VIL
VIN=12V
VINVIH or VIL,
PINCKISDI
VINVDD or GND
TA-40125℃
5.3
--
--
0.8*VDD
GND
5.4 5.6
2 --
-- ±1
-- VDD
-- 0.2*VDD
V
uS
uA
V
V
Output current voltage
regulation
Output current line regulation
Pull down resistor
%dVOUT
%dVCC
RINLOW
VCC45.5V,VOUT
between 1.0V and
3.0V
RLIN,
--
--
--
±1 --
±1 --
300 --
%/V
%/V
K
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Function Block Diagram
INK1003 IC (256-Gray Level)
Greeled Electronic LtdFig2,InternalFunctionBlockDiagramofINK1003
PIN Description
PIN NAME
FUNCTION
1
ROUT
18mA low saturation constant current driver
2
GOUT
18mA low saturation constant current driver
3
BOUT
18mA low saturation constant current driver
4
GND
Ground
5
SDO
Buffered serial data output
6 SDI Serial data input
Output polarity reverse
7
POL
POL=HIGHoutput is reversed
POL=LOW”,normal operation
8
VCC
Power supply
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INK1003 IC (256-Gray Level)
APPLICATIONS INFORMATION
Constant Current Output
In LED displays and decorative LED lighting system, INK 1003 can provide a constant output current varies
precious little with output voltage, as several reasons bellow:
1) Advanced circuit construction results in Low output current deviation: ±1 % between channels in a
single chip, ±3% between chips;
2) Advanced circuit construction results in constant current when output voltage is higher than saturation
voltage. As the advantageous line regulation the I/V diagram of output current between voltage is nearly a
horizontal straight line , which means output current is nearly independent with output voltage.
Power Dissipation of INK1003
The MAX power dissipation of INK1003 is determined by: PD(max)=(Tj-Ta)/Rth(j-a),when all 3 channel is on
the power dissipation is : PD (act) = (I DD ×VDD ) + (IOUT × Duty ×VDS × 3) . In order to guarantee:
PD(act)PD(MAX), the formula translation between output current and duty is :
Greeled Electronic LtdIOUT
= (T j Ta
Rth( ja)
ICC
×VCC ) /VDS
/ Duty / 3
When ambient temperature rises, the MAX power dissipation falls.
Load Voltage (VLED)
The design value of VDS is 0.4~5V. Ensuring PD(ACT)>PD(MAX), the VDS could be higher.. VDS=VLED-VF
when VLED=12V. VLED is load voltage, which can be set lower, which is just higher than the lowest voltage
allowed. A voltage divider can be used when necessary to produce a VDROP for a lower power dissipation in
IC, the formula can be described as: VDS=(VLED-VF)-VDROP
As the picture shows, resistors and zener diodes are suitable to reduce power dissipation of INK1003.
Fig 3, the voltage divider design of INK1003
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INK1003 IC (256-Gray Level)
Gray Scale Data Word Format
INK1003 uses the one-line communication mode, with return to zero code gray scale data
transport. When the SDI node receives total 24 bit data, SDO node begins to send data to the next chip (set low
before sending) . After that the IC no longer receives data, 3 PWM output named ROUTGOUTBOUT outputs
signal with different duty according to the data received. The period of output signal is 3.2mS.The chip receives
data again until RESET signal is sent to SDI node of the IC. Then the SDI node receives total 24 bit data, SDO
node begins to send data to the next IC again. The output of ROUTROUTBOUT will not change until receiving
RESET signal. After the RESET signal( more than 24uS low signal) , 24 bit PWM data received newly will output
to ROUTGOUTBOUT.
Automatic shaping forwarding technology is utilized, so the number of cascade is not affected by the signal
transmission, but only affected by refresh speed. A n example of 1024 cascade, whose refresh time is
1024X0.4X20.8192ms, There will be no flicker phenomenon.
During data transfer, the first bit is the MSB of the ROUT channel, the last one transferred into the data shift
register is the LSB of the BOUT channel.
The current duty of each channel of as bellow:
Greeled Electronic LtdDXOUT
=
L[7]* 27
+ L[6]* 26
+ L[5]* 25
+
L[4]* 24 + L[3]* 23
256
+
L[2]* 22
+
L[1]* 21
+ L[0] ----- (7)
Where L[x]=”0” or “1”, which is RGB[x], x=0,1,2……7 in the gray scale data. Gray scale data
0000 0000 is for the minimum 0 duty ratio, and 1111 1111 is for the maximum duty ratio.
INK1003 Communication Protocol
24 BIT DATA FORMATE
R7 R6 R5 R4 R3 R2 R1 R0 G7 G6 G5 G4 G3 G2 G1 G0 B7 B6 B5 B4 B3 B2 B1 B0
NOTE: MSB is sent first, LSB is sent last. In order to send data ROUT, GOUT, BOUT.
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