LXY28161 (LINGXINYU SCIENCE AND TECHNOLOGY)
16-channel constant current LED Driver

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LXY28161 USER’S MANUAL
LXY28161 USER’S MANUAL
JULY 2008
V1.0
Pay attention to the last page
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LXY28161 (LINGXINYU SCIENCE AND TECHNOLOGY)
16-channel constant current LED Driver

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LXY28161 USER’S MANUAL
CONTENTS
1 Product Description.................................................................................................................3
1.1 Features .............................................................................................................................3
1.2 Applied field .....................................................................................................................3
1.3 Basic Structure Description...............................................................................................3
2 LXY28161 Specification..........................................................................................................3
2.1 Block Diagram and Pin Configuration..............................................................................3
2.2 Maximum Rating ..............................................................................................................5
2.3 Electrical Characteristics (VDD=5.0V) ..............................................................................6
2.4 Switching CharacteristicsVDD5V..........................................................................7
2.5 Test Circuit for Switching Characteristics ........................................................................8
2.6 Timing Waveform.............................................................................................................9
2.6.1 Serial-Port Timing Waveform.......................................................................................9
2.6.2 Output-Current Channel Timing Waveform .................................................................9
2.7 Constant Current .............................................................................................................10
2.8 Setting Output Current ....................................................................................................10
2.9 Delay Time of Staggered Output ....................................................................................10
2.10 Package Power Dissipation .............................................................................................10
2.11 Usage of Thermal Pad.....................................................................................................10
2.12 Thermal Protection Function...........................................................................................11
2.13 LED Supply Voltage.......................................................................................................11
2.14 Switching Noise Reduction.............................................................................................11
2.15 Equivalent Circuits of Inputs and Outputs ......................................................................12
3 Package Outline.....................................................................................................................12
4 Attention…………………………………………………………………………………… 14
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LXY28161 (LINGXINYU SCIENCE AND TECHNOLOGY)
16-channel constant current LED Driver

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LXY28161 USER’S MANUAL
1 Product Description
LXY28161, the 16-channel constant
current LED Driver, is designed for LED video
applications using internal Wise Pulse Width
Modulation (W-PWM) control with selectable
16-bit color depth. LXY28161 saves the 60 Hz
images input data in the 8K RAM, then converts
into each pixel gray scale of output channel, all
output channels can be built with 65536 gray
scales and 4800 Hz refresh rate.
LXY28161 has 16 constant-current
output channels. Constant output current is
invariant to load voltage change. The output
current can be preset through an external
resistor. LXY28161 supports static and any scan
mode (within 16) led displays. The gray scales
and refresh rate is user adjustable.
1.1 Features
z Backward compatible with main trend 16-channel constant current IC in
package
z 16 constant-current output channels
z 16-bit color depth W-PWM control
z Refresh rate up to 4800Hz
z Schmitt trigger input
z Staggered output delay (reduce EMI)
z Over temperature protection
z Constant output current range: 5V, 5~60mA
z Output current accuracy: between channels: +3%, between ICs: +6%
z Maximum data clock frequency: 25MHz
z 5V supply voltage
1.2 Applied field
z LED video applications
1.3 Basic Structure Description
LXY28161 mainly includes serial-data input, Wise Pulse Width Modulation, constant current
controlling circuit, constant current output.
2 LXY28161 Specification
2.1 Block Diagram and Pin Configuration
LXY28161 applies SOP24 and TSSOP-24 in package outline, Block Diagram and Pin
Configuration are as following diagrams:
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LXY28161 (LINGXINYU SCIENCE AND TECHNOLOGY)
16-channel constant current LED Driver

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Block Diagram
LXY28161 USER’S MANUAL
Pin Configuration
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LXY28161 (LINGXINYU SCIENCE AND TECHNOLOGY)
16-channel constant current LED Driver

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LXY28161 USER’S MANUAL
Pin Name
GND
SDI
CLK
LE
OUT0~15
NC
SDO
R-EXT
Pin No.
1
2
3
4
5~20
21
22
23
Type
Power
Schmitt trigger
input
Schmitt trigger
input
Schmitt trigger
input
Output
-
Controllable
staggered
output delay
Controlling
VDD 24 Power
2.2 Maximum Rating
Function
Ground terminal for control
logic and current sink
Serial-data input to the shift
register
Clock input terminal for data
shift on rising edge
Data strobe terminal and
controlling command with DCLK
Constant current output
terminal, 5-60mA
-
10ns,20ns,30ns selectable.
Serial-data output to the
receiver-end SDI of next
driver IC
Input terminal used to connect
an external resistor for
setting up output current for
all output channels
5V supply voltage terminal
Characteristic
Supply Voltage
Input Pin Voltage (SDI)
Output Current
Sustaining Voltage at OUT Port
Data Clock Frequency
GND Terminal Current
Power Dissipation L Type
(On PCB, Ta=25°C) S Type
Thermal Resistance L Type
(On PCB, Ta=25°C) S Type
Operating Temperature
Storage Temperature
Symbol
VDD
VIN
IOUT
VDS
DCLK
IGND
PD
PD
R )th(j-a
Topr
Tstg
Rating
7
-0.4~
VDD+0.4
+60
7
+25
+1000
2.12
1.73
59.1
72.43
-40~+85
-55~+150
Unit
V
V
mA
V
MHz
mA
W
W
°C/W
°C
°C
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LXY28161 (LINGXINYU SCIENCE AND TECHNOLOGY)
16-channel constant current LED Driver

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LXY28161 USER’S MANUAL
2.3 Electrical Characteristics (VDD=5.0V)
Characteristics
Supply Voltage
Sustaining Voltage
at OUT Ports
Output Current
Input
Voltage
”H” level
”L” level
Output Leakage
Current
Output
Voltage
SDO
Current Skew
(Channel)
Current Skew (IC)
Output Current vs.
Output Voltage
Regulation
Output Current vs.
Output Voltage
Regulation
Pull-down Resistor
Supply
Current
”Off”
”On”
Thermal Flag
Temperature
Sym
bol
VDD
Condition
-
Min.
3.3
VDS OUT0 ~ OUT15
IOUT
Refer to “Test Circuit for
Electrical Characteristics”
IOH SDO
IOL SDO
VIH Ta=-40~85ºC
VIL Ta=-40~85ºC
-
5
-
-
0.7*VDD
GND
IOH VDS=7.0V
-
VOL
VOH
ΔIOUT
1
ΔIOUT
2
%/ΔV
DS
%/dV
DD
RIN(d
own)
IDD(of
f) 1
IDD(of
f) 2
IDD(of
f) 3
IDD(o
n) 1
IDD(o
n) 2
TTF
IOL=+6.0mA
IOH=-6.0mA
IOUT=10.8mA
VDS=1.0V
IOUT=10.8mA
VDS=1.0V
Rext=1800
Rext=1800
VDS 1.0V and 3.0V,
Rext=910@21mA
VDD 4.5V and 5.5V
LE
Rext=Open
OUT0 ~ OUT15
=Off
Rext=1800
OUT0 ~ OUT15
=Off
Rext=910
OUT0 ~ OUT15
=Off
Rext=1800
OUT0 ~ OUT15
=On
Rext=91
OUT0 ~ OUT15
=On
Junction Temperature
-
4.6
-
-
-
-
250
-
-
-
-
-
135
Typ.
5.0
-
-
-
-
-
-
-
-
-
±1.5
±3.0
±0.1
±1.0
500
11.4
12.3
13.7
14.2
16.3
150
Max.
5.5
VDD+0.4
60
-6.0
6.0
VDD
0.3*VDD
0.5
0.4
-
±3.0
±6.0
±0.5
±5.0
800
12.5
13.5
15.0
15.7
18.5
165
Unit
V
V
mA
mA
mA
V
V
μA
V
V
%
%
%/V
%/V
K
mA
°C
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LXY28161 (LINGXINYU SCIENCE AND TECHNOLOGY)
16-channel constant current LED Driver

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LXY28161 USER’S MANUAL
2.4 Switching CharacteristicsVDD5V
Characteristics
Symbol Condition Min. Typ. Max
Setup Time
SDI - DCLK
LE
DCLK
LE
DCLK
tSU0
tSU1
tSU2
Hold Time
DCLK- SDI
DCLK- LE
tH0
tH1
Propagation
Delay Time
DCLK -SDO
(adjustable)
VDD=5.0V
VIH=VDD
tPD0 VIL=GND
GCLK –
OUT4n
tPD1
OUT4n + 1* tDL1 RL=152
Stagger
OUT4n + 2 *
tDL2
CL=10pF
Delay Time OUT4n + 3 *
tDL3
C1=100nF
C2=10μF
LE
Pulse Width
DCLK
tw(L)
tw(DCLK)
Output Rise Time of Output
Ports
Output Fall Time of Output
Ports
tOR
tOF
* Refer to the Timing Waveform, when n=0, 1, 2, 3.
1-
-
1-
-
5-
-
3-
-
7-
-
5 10 20
15 20
30
25 30
40
DCLK output to the
receiver-end SDI of next
driver IC
* 75
-
- 25
- 50
-
-
- 75
-
5-
-
20 -
-
- 10 20
- 10 20
Unit
ns
ns
ns
ns
ns
ns
ns
ns
-
ns
ns
ns
ns
ns
ns
ns
ns
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LXY28161 (LINGXINYU SCIENCE AND TECHNOLOGY)
16-channel constant current LED Driver

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LXY28161 USER’S MANUAL
2.5 Test Circuit for Switching Characteristics
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LXY28161 (LINGXINYU SCIENCE AND TECHNOLOGY)
16-channel constant current LED Driver

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LXY28161 USER’S MANUAL
2.6 Timing Waveform
2.6.1 Serial-Port Timing Waveform
2.6.2 Output-Current Channel Timing Waveform
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LXY28161 (LINGXINYU SCIENCE AND TECHNOLOGY)
16-channel constant current LED Driver

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LXY28161 USER’S MANUAL
2.7 Constant Current
In LED display application, LXY28161 provides nearly no
variation in current from channel to channel and from IC to IC. This
can be achieved by:
1) The typical current variation between channels is less than ±3%,
and that between IC is less than ±6%.
2) In addition, the output current can be kept constant regardless of
LED forward voltages. This guarantees LED to be performed on the same
brightness as user’s specification.
2.8 Setting Output Current
The output current (IOUT) is set by an external resistor, Rext. The
default relationship between IOUT and Rext is:
VR-EXT=1.26V ;
IOUT=(VR-EXT/Rext) x 15.5
Rext is the resistance of the external connected to R-EXT
terminal
VR-EXT is its voltage
The output current is about 21mA when Rext=910Ω and 10.8mA
when Rext=1800Ω
2.9 Delay Time of Staggered Output
LXY28161 has a built-in staggered circuit to perform delay
mechanism. 16 channels are divided to four groups. Each output port
has 25nS delay time, so that the instant current from the power line
will be lowered.
2.10 Package Power Dissipation
The maximum allowable package power dissipation is determined as
PD(max)=(Tj–Ta)/Rth(j-a).
When 16 output channels are turned on simultaneously, the actual
package power dissipation is
PD(act)=(IDDxVDD)+(IOUTxDutyxVDSx16).
Therefore, to keep PD (act)≤PD (max), the allowable maximum output
current as a function of duty cycle is:
IOUT={[(TjTa)/Rth(j-a)](IDDxVDD)}/ (DutyxVDSx16), Tj=150°C
The maximum power dissipation, PD(max)=(Tj–Ta)/Rth(j-a), decreases
as the ambient temperature increases. So the LXY28161 must work in
Safe Operation Area.
2.11 Usage of Thermal Pad
The PCB area L2xW2 is 4 times of the IC’s area L1xW1.
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LXY28161 (LINGXINYU SCIENCE AND TECHNOLOGY)
16-channel constant current LED Driver

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LXY28161 USER’S MANUAL
2.12 Thermal Protection Function
The thermal protection function is enabled by default. The
output current will decrease to 25%. As soon as the temperature is
below 110℃, the thermal error flag will return to 0 and the output
current will recover from the 25% current.
2.13 LED Supply Voltage
LXY28161 are designed to operate with VDS ranging from 0.4V to
0.8V (depending on IOUT=5 ~ 60mA), considering the package power
dissipating limits. VDS may be higher enough to make when VLED=5V,
PD (act) < PD (max) when VLED=5V and VDS=VLED–VF, in which VLED is the
load supply voltage. In this case, it is recommended to use the
lowest possible supply voltage or to set an external voltage reducer,
VDROP. A voltage reducer lets VDS=(VLED – VF) – VDROP. Resistors or
Zener diode can be used in the applications as shown in the following
figures.
2.14 Switching Noise Reduction
LED drivers are frequently used in switch-mode applications
which always behave with switching noise due to the parasitic
inductance on PCB. To eliminate switching noise, refer to Application
Note for 8-bit and 16-bit LED Drivers-Overshoot.
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LXY28161 (LINGXINYU SCIENCE AND TECHNOLOGY)
16-channel constant current LED Driver

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LXY28161 USER’S MANUAL
2.15 Equivalent Circuits of Inputs and Outputs
Equivalent circuits of Inputs and Outputs
3 Package Outline
LXY2816 applies SOP24 and TSSOP-24 package outline:
SOP-24 Outline Drawing
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LXY28161 (LINGXINYU SCIENCE AND TECHNOLOGY)
16-channel constant current LED Driver

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LXY28161 USER’S MANUAL
SSOP-24 Outline Drawing
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16-channel constant current LED Driver

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LXY28161 USER’S MANUAL
4. Attention
4.1 The Rt value should satisfy: Rt < ( Rf / N /9), besides, set the
value as small as possible. Otherwise, there will be current
difference between ICs, which will effect the color uniformity.
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LXY28161 (LINGXINYU SCIENCE AND TECHNOLOGY)
16-channel constant current LED Driver

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LXY28161 USER’S MANUAL
4.2 In the Line-output, before connecting the GND, add a zener diode.
The voltage of the zener diode is between 3.0V and 3.6V. Test and
choose one that suit most. In out test, 3.3V is good.
4.3 For Electronic capacitors, please use Taiwan Lelon’s RXZ series
high frequency capacitors, or some other brand which is similar in
functions with the follow specifications:
http://www.lelon.com.tw/index.php?fn=search2&keyword=rxz
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LXY28161 (LINGXINYU SCIENCE AND TECHNOLOGY)
16-channel constant current LED Driver

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LXY28161 USER’S MANUAL
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