16-bit Constant Current LED Driver

DM13A
Version
: A.004
Issue Date : 2011/12/15
File Name : SP-DM13A-A.004.doc
Total Pages : 21
16-bit Constant Current LED Driver
新竹市科學園區展業一路 9 號 7 樓之 1
SILICON TOUCH TECHNOLOGY INC.
9-7F-1, Prosperity Road I, Science Based Industrial Park,
Hsin-Chu, Taiwan 300, R.O.C.
Tel：886-3-5645656
Fax：886-3-5645626
DM13A
DM13A
16-bit Constant Current LED Driver
General Description
DM13A is a constant-current sink driver specifically designed for LED display applications.
The device incorporates shift registers, data latches, and constant current circuitry on the silicon
CMOS chip. The maximum output current value of all 16 channels is adjustable by a single external
resistor.
Features
z
Constant-current outputs: 3mA to 60mA adjustable by one external resistor
z
Maximum output voltage: 17V
z
Maximum clock frequency: 25MHz
z
Power supply voltage: 3.3V to 5V
z
In-rush current control
z
Bit-to-bit skew : ± 3 %
z
Package and pin assignment compatible to conventional LED drivers (ST2221C, DM134/5/6)
Chip-to-chip skew : ± 6 %
Applications
z
Indoor/Outdoor LED Video Display
z
LED Variable Message Signs (VMS) System
Package Types
z
PDIP24, SOP24, SOP24B, SSOP24, QFN24
Block Diagram
16-bit Constant Current LED Driver
Version:A.004
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Page 1
DM13A
16-bit Constant Current LED Driver
Version:A.004
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Page 2
DM13A
Pin Connection
QFN24
GND
1
24
VDD
23
REXT
DAI
2
DCK
3
LAT
4
OUT0
5
OUT1
6
OUT2
7
OUT3
8
OUT4
9
OUT5
10
15
OUT10
OUT6
11
14
OUT9
OUT7
12
13
OUT8
DIP24
SOP24
SSOP24
TSSOP24
(top view)
22
DAO
21
EN
20
OUT15
19
OUT14
18
OUT13
17
OUT12
16
OUT11
Pin Description
PIN No.
PIN NAME
FUNCTION
DIP24/SOP24/SSOP24:1
QFN24:23,thermal pad
GND
Ground terminal.
DIP24/SOP24/SSOP24: 2
QFN24:24
DAI
Serial data input terminal.
DIP24/SOP24/SSOP24: 3
QFN24:1
DCK
Synchronous clock input terminal for serial data transfer. Data
is sampled at the rising edge of DCK.
DIP24/SOP24/SSOP24: 4
QFN24:2
LAT
Input terminal of data strobe. Data on shift register goes
through at the high level of LAT (level trigger). Otherwise,
data is latched.
DIP24/SOP24/SSOP24: 5~20
QFN24:3~18
OUT0~15 Sink constant-current outputs (open-drain).
Output enable terminal:
‘H’ for all outputs are turned off ,
‘L’ for all outputs are active.
DIP24/SOP24/SSOP24: 21
QFN24:19
EN
DIP24/SOP24/SSOP24: 22
QFN24:20
DAO
Serial data output terminal.
DIP24/SOP24/SSOP24: 23
QFN24:21
REXT
External resistors connected between REXT and GND for
output current value setting.
DIP24/SOP24/SSOP24: 24
QFN24:22
VDD
Supply voltage terminal.
16-bit Constant Current LED Driver
Version:A.004
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Page 3
DM13A
Equivalent Circuit of Inputs and Outputs
1. DCK, DAI, LAT, EN terminals
2. DAO terminals
16-bit Constant Current LED Driver
Version:A.004
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Page 4
DM13A
Maximum Ratings*1(Ta=25°C, Tj(max) = 150°C)
CHARACTERISTIC
Supply Voltage
Input Voltage
SYMBOL
RATING
UNIT
VDD
-0.3 ~ 7.0
V
VIN
-0.3 ~ VDD+0.3
V
Output Current
IOUT
70
mA
Output Voltage
VOUT
-0.3 ~ 17
V
Input Clock Frequency
FDCK
25
MHz
GND Terminal Current
IGND
1500
mA
1.90 ( PDIP24 : Ta=25°C)
Power Dissipation
(4 layer PCB)
1.20 ( SOP24 : Ta=25°C)
PD
W
TBD( SOP24B : Ta=25°C)
1.05 ( SSOP24 : Ta=25°C)
50.0 (PDIP24 )
Thermal Resistance
TBD ( SOP24B)
Rth(j-a)
°C/W
79.2 (SOP24 )
90.2 (SSOP24 )
Operating Temperature
Top
-40 ~ 85
°C
Storage Temperature
Tstg
-55 ~ 150
°C
Recommended Operating Condition
CHARACTERISTIC
Supply Voltage
SYMBOL
CONDITION
MIN.
TYP.
MAX.
UNIT
VDD
⎯
3.3
5.0
5.5
V
1.0
⎯
0.5VDD
⎯
⎯
17
*2
Output Voltage
VOUT
Driver On
Output Voltage
VOUT
Driver Off
IO
OUTn
5
⎯
60
Output Current
IOH
VOH = VDD – 0.2 V
⎯
⎯
+1.2
IOL
VOL = 0.2 V
Input Voltage
VIH
VIL
Input Clock Frequency
FDCK
LAT Pulse Width
tw LAT
*3
VDD = 3.3 V ~ 5.5V
Single Chip Operation
⎯
⎯
-1.4
0.8VDD
⎯
VDD
0.0
⎯
0.2VDD
⎯
⎯
25
15
⎯
⎯
tw DCK
15
⎯
⎯
Set-up Time for DAI
tsetup(D)
10
⎯
⎯
Hold Time for DAI
thold(D)
10
⎯
⎯
Set-up Time for LAT
tsetup(L)
10
⎯
⎯
Hold Time for LAT
thold(L)
10
⎯
⎯
DCK Pulse Width
VDD = 5.0V
V
mA
V
MHz
ns
*1
Stress beyond those listed under “Maximum Ratings” may cause permanent damage to the device. These are stress
ratings only; it’s not implied functional operation condition. Exposure to “Maximum Ratings” conditions for extended
periods may affect device reliability and life time.
*2
Notice that the power dissipation is limited to its package and ambient temperature.
*3
The driver output voltage including any overshoot stress has to be compliant with the maximum voltage (17V).
16-bit Constant Current LED Driver
Version:A.004
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Page 5
DM13A
Electrical Characteristics (VDD = 5.0 V, Ta = 25°C unless otherwise noted)
CHARACTERISTIC
SYMBOL
CONDITION
MIN.
TYP.
MAX.
Input Voltage “H” Level
VIH
CMOS logic level
0.8VDD
⎯
VDD
Input Voltage “L” Level
VIL
CMOS logics2 level
GND
⎯
0.2VDD
Output Leakage Current
IOL
VOH = 17 V
⎯
⎯
±1.0
VOL
IOL = 1.5 mA
⎯
⎯
0.2
VOH
IOH= 1.4 mA
VDD-0.2
⎯
⎯
⎯
⎯
±3
%
⎯
⎯
±6
%
Rrext = 2.2KΩ
VOUT = 1 V ~ 3 V
⎯
±0.1
±0.5
% / VDD
Rrext = 2.2 KΩ
⎯
±1
±4
IDD(off)
power on
all pins are open
unless VDD and GND
⎯
3
4
IDD(off)
input signal is static
Rrext = 2.9 KΩ
all outputs turn off
⎯
5
6
IDD(on)
input signal is static
Rrext = 2.9 KΩ
all outputs turn on
⎯
5
6
IDD(off)
input signal is static
Rrext = 1.05K Ω
all outputs turn off
⎯
9
10
IDD(on)
input signal is static
Rrext = 1.05K Ω
all outputs turn on
⎯
9
10
Output Voltage (DAO)
Output Current Skew
(Channel-to-Channel)
*1
Output Current Skew
(Chip-to-Chip)
*2
Output Voltage Regulation
Supply Voltage Regulation
Supply Current
*3
IOL1
UNIT
V
uA
V
VOUT = 1.0 V
Rrext = 2.2KΩ
IOL2
% / VOUT
%/V
mA
*1
Channel-to-channel skew is defined as the ratio between (any Iout – average Iout) and average Iout, where average
Iout = (Imax + Imin) / 2.
*2
Chip-to-Chip skew is defined as the range into which any output current of any IC falls.
*3
IO excluded.
16-bit Constant Current LED Driver
Version:A.004
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Page 6
DM13A
Switching Characteristics (VDD = 5.0V, Ta = 25°C unless otherwise noted)
CHARACTERISTIC
SYMBOL
CONDITION
EN-to-OUT0
Propagation Delay
tpLH
LAT-to-OUT0
(‘L’ to ‘H’)
Propagation Delay
TYP.
MAX.
⎯
52
⎯
⎯
49
⎯
DCK-to-DAO
VIH = VDD
⎯
20
⎯
EN-to-OUT0
VIL = GND
⎯
22
⎯
Rrext = 2.2KΩ
⎯
75
⎯
VL = 5.0 V
⎯
19.5
⎯
⎯
33.5
⎯
LAT-to-OUT0
(‘H’ to ‘L’)
MIN.
tpHL
DCK-to-DAO
Output Current Rise Time
tor
Output Current Fall Time
tof
⎯
6
⎯
Output Delay Time (OUT(n)-to-OUT(n+1))
tod
⎯
5
⎯
*1
CL
= 13 pF
UNIT
ns
Switching Characteristics (VDD = 3.3V, Ta = 25°C unless otherwise noted)
CHARACTERISTIC
SYMBOL
EN-to-OUT0
Propagation Delay
LAT-to-OUT0
(‘L’ to ‘H’)
Propagation Delay
tpLH
MIN.
TYP.
MAX.
⎯
51
⎯
⎯
21.5
⎯
DCK-to-DAO
VIH = VDD
⎯
12
⎯
EN-to-OUT0
VIL = GND
⎯
23
⎯
Rrext = 2.2KΩ
⎯
49
⎯
VL = 5.0 V
⎯
11.5
⎯
⎯
35
⎯
LAT-to-OUT0
(‘H’ to ‘L’)
*1
CONDITION
tpHL
DCK-to-DAO
Output Current Rise Time
tor
Output Current Fall Time
tof
⎯
10
⎯
Output Delay Time (OUT(n)-to-OUT(n+1))
tod
⎯
10
⎯
*1
CL
= 13 pF
UNIT
ns
CL means the probe capacitance of oscilloscope.
16-bit Constant Current LED Driver
Version:A.004
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Page 7
DM13A
Timing Diagram
1. DCK-DAI, DAO
2. DCK-LAT
3. LAT-OUT0
16-bit Constant Current LED Driver
Version:A.004
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Page 8
DM13A
4. EN-OUT0
5. OUTn+1-OUTn
16-bit Constant Current LED Driver
Version:A.004
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Page 9
DM13A
Constant-Current Output
Constant-current value of each output channel is set by an external resistor connected between
the REXT pin and GND. Varying the resistor value can adjust the current scale ranging from 3mA to
60mA. The reference voltage of REXT terminal (Vrext) is approximately 1.2V. The output current
value is calculated roughly by the following equation:
Iout(mA)
3
5
10
20
30
40
50
M
55
54.1
50
46.6
45
43.3
41.6
Iout(mA)
Output Current as a Function of Rrext value
60
55
50
45
40
35
30
25
20
15
10
5
0
Iout (mA) ~
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Vrext (V)
× M
Rrext (KΩ)
16
17
18
19
20
21
22
Rext （kΩ）
Iout(mA)
Output Current as a Function of Output Voltage
60
55
50
45
40
35
30
25
20
15
10
5
0
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
2.2
2.4
2.6
2.8
3
Vout(V)
In order to obtain a good performance of constant-current output, a suitable output voltage is
necessary. Users can get related information about the minimum output voltage above.
16-bit Constant Current LED Driver
Version:A.004
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Page 10
DM13A
Serial Data Interface
The serial-in data (DAI) will be clocked into 16 bit shift register synchronized on the rising
edge of the clock (DCK). The data ‘1’ represents the corresponding current output ‘ON’, while the
data ‘0’ stands for ‘OFF’. The data will be transferred into the 16 bit latch register when the strobe
signal (LAT) is ‘H’ (level trigger); otherwise, the data will be held. The trigger timing of the
serial-out data (DAO) will be shifted out on synchronization to the rising edge of the clock. All
outputs are turned off while enable terminal (EN) is kept at high level. And they are active when EN
shifts to low.
16-bit Constant Current LED Driver
Version:A.004
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Page 11
DM13A
Outputs Delay
Large in-rush currents will occur when the system activates all the outputs at once. To reduce
this effect, DM13A is designed to have a constant unit of delay (around 5ns) between outputs. The
delay sequence for every output goes like this: OUT0 (no delay) Æ OUT15 Æ OUT1 Æ OUT14 Æ
OUT2 Æ OUT13 Æ OUT3 Æ OUT12 Æ OUT4 Æ OUT11 Æ OUT5 Æ OUT10 Æ OUT6 Æ
OUT9 Æ OUT7 Æ OUT8 (the largest delay).
Global Brightness Control
DM13A has no built-in global brightness control feature. In order to obtain a lower resolution
of global brightness control effect, two methods could be utilized. One is providing PWM signal
synchronized on latch pulse to modulate the output enable terminal (EN pin). The other is to adjust
the Rrext value or voltage drop across the external resistor. Please see the reference circuit below:
16-bit Constant Current LED Driver
Version:A.004
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Page 12
DM13A
Power Dissipation
The power dissipation of a semiconductor chip is limited to its package and ambient
temperature, in which the device requires the maximum output current calculated for given
operating conditions. The maximum allowable power consumption can be calculated by the
following equation:
Tj(junction temperature)(max)(°C)– Ta(ambient temperature)(°C)
Pd(max)(Watt) =
Rth(junction-to-air thermal resistance)(°C/Watt)
The relationship between power dissipation and operating temperature can be refer to the figure
below:
3
Tj(max)=150°C
PDIP24
2.5
Rth(PDIP24)=50.0°C/Watt
Power Dissipation Pd(W)
Rth(SOP24)=79.2°C/Watt
Rth(SSOP24)=90.2°C/Watt
2
SOP24
1.5
SSOP24
1
0.5
0
0
20
40
60
80
100
120
140
160
Ambient Temperature Ta ( ℃ )
The power consumption of IC can be determined by the following equation and should be less than
the maximum allowable power dissipation:
16-bit Constant Current LED Driver
Version:A.004
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Page 13
DM13A
Typical Application
16-bit Constant Current LED Driver
Version:A.004
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Page 14
DM13A
Package Outline Dimension
PDIP24
DIMENSIONS IN MM
SYMBOLS
MIN.
TYP.
MAX.
A
-
-
5.334
A1
0.381
-
-
A2
3.175
3.302
3.429
b
-
1.524
-
b1
-
0.480
-
D
31.242
-
32.512
E
7.620 BSC
E1
6.426
-
6.680
e
-
2.540
-
eB
8.500
-
9.525
L
2.921
-
3.810
θ°
0
-
15
16-bit Constant Current LED Driver
Version:A.004
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Page 15
DM13A
Package Outline Dimension
SSOP24
12
A
C
A2
1
SEATING PLANE
b
e
0.004
L1
SYMBOLS
MIN.
TYP.
MAX.
A
1.346
1.626
1.753
A1
0.102
0.152
0.254
A2
-
-
1.499
b
0.203
-
0.305
C
0.178
-
0.254
D
8.560
8.661
8.738
E
5.791
5.994
6.198
e
3.810
3.912
3.988
L
0.406
0.635
1.270
L1
16-bit Constant Current LED Driver
DETAIL A
0.635 BSC
E1
θ°
L
A1
GAUGE PLANE
A
13
E
24
E1
D
1.041 BSC
0
-
8
Version:A.004
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Page 16
DM13A
Package Outline Dimension
E
H
SOP24
b
e
DIMENSIONS IN MM
SYMBOLS
MIN.
TYP.
MAX.
A
-
-
2.650
A1
0.100
-
0.300
A2
2.050
-
-
b
0.310
c
0.200
-
0.330
D
15.240
-
15.700
0.510
E1
7.500BSC
e
1.270 BSC
E
10.300BSC
L1
1.40REF
L
0.400
-
1.270
θ°
0
-
8
16-bit Constant Current LED Driver
Version:A.004
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Page 17
DM13A
Package Outline Dimension
C4
C1
C2
C3
SOP24B
DIMENSIONS IN MM
SYMBOLS
MIN.
TYP.
MAX.
A
-
-
1.900
A1
0.050
0.100
0.200
A2
1.300
1.500
1.700
b
0.300
0.400
0.500
c
0.100
0.150
0.250
D
12.800
13.000
13.200
E
7.700
8.000
8.300
e
1.000 BSC
E1
5.800
6.000
6.200
L
0.250
0.450
0.650
θ°
0
-
10
16-bit Constant Current LED Driver
Version:A.004
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Page 18
DM13A
Package Outline Dimension
QFN24
DIMENSIONS IN MM
SYMBOLS
MIN.
TYP.
MAX.
A
0.700
0.750
0.800
A1
0.000
0.020
0.050
A3
0.203 REF
b
0.180
0.250
0.300
D
3.900
4.000
4.100
D2
1.900
2.000
2.100
E
3.900
4.000
4.100
E2
1.900
2.000
2.100
e
0.500 BSC
L
0.300
0.400
0.500
y
-
-
0.080
16-bit Constant Current LED Driver
Version:A.004
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Page 19
DM13A
The products listed herein are designed for ordinary electronic applications, such as
electrical appliances, audio-visual equipment, communications devices and so on. Hence,
it is advisable that the devices should not be used in medical instruments, surgical
implants, aerospace machinery, nuclear power control systems, disaster/crime-prevention
equipment and the like. Misusing those products may directly or indirectly endanger
human life, or cause injury and property loss.
Silicon Touch Technology, Inc. will not take any responsibilities regarding the misusage
of the products mentioned above. Anyone who purchases any products described herein
with the above-mentioned intention or with such misused applications should accept full
responsibility and indemnify. Silicon Touch Technology, Inc. and its distributors and all
their officers and employees shall defend jointly and severally against any and all claims
and litigation and all damages, cost and expenses associated with such intention and
manipulation.
16-bit Constant Current LED Driver
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