HIGH CONSTANT CURRENT LED DRIVER with ERROR DETECTION

DD312
Version
: A.002
Issue Date : 2010/10/05
File Name : SP-DD312-A.002.doc
Total Pages : 22
HIGH CONSTANT CURRENT LED DRIVER
with ERROR DETECTION
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
DD312
DD312
HIGH CONSTANT CURRENT LED DRIVER
with ERROR DETECTION
General Description
DD312 is a high constant current driver designed for LED lighting application and power
LEDs. It incorporates a constant current circuitry with current value set by an external resistor. The
output enable terminal allows dimming control by system. The fast response of output current can
adapt to high dimming resolution and high refresh rate applications. Built-in LED open detection,
over temperature, and over current protection functions ensure the system reliability.
Features
z
z
z
Maximum output current: 1A (determined by the external resistor)
Minimum output voltage: 1V (Iout = 1A)
Maximum output voltage: 18V
z
z
z
z
z
z
Output enable terminal: 1MHz (max.)
Supply voltage range: 5V ~ 18V
Over current protection
Thermal shutdown
Thermal alarm (SOP8 only)
LED open detection (SOP8 only)
Applications
z
z
z
LED architectural or entertainment lighting
LED general or specialty illumination
LED backlighting applications
Package Types
z
TO-252, SOP8 (with thermal pad), MSOP8, SOP8
HIGH CONSTANT CURRENT LED DRIVER with ERROR DETECTION
Version:A.002
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Page 1
DD312
Block Diagram
Pin Connection
GND
1
EN
2
OUT
REXT
3
OUT
RESERVED
4
8
MSOP8
SOP8
GND
1
8
VCC
EN
2
7
ALARM
OUT
3
6
REXT
RESERVED
4
5
REXT
VCC
7
ALARM
6
REXT
5
RESERVED
REXT
SOP8
Pin Description
PIN No.
PIN NAME
TO252:3/MSOP8:1/SOP8:1
GND
TO252:5/ MSOP8:2/SOP8:2
EN
TO252:2/ MSOP8:4/SOP8:3
OUT
MSOP8:5/SOP8:4
RESERVED
TO252:1/ MSOP8:3,6/SOP8:5,6
REXT
FUNCTION
Ground terminal.
Output current enable terminal.
*1
Sink constant current outputs (open-drain).
Terminal for testing, user should leave this pin open.
External resistor connected between REXT and GND
for driver current value setting.
Output open drain terminal: (connected to a pull-high resistor)
MSOP8:7/SOP8:7
ALARM
‘H’ for normal conditions,
‘L’ for LED open or chip overheated.
TO252:4/ MSOP8:8/SOP8:8
*1
VCC
Power supply terminal.
Notice that both REXT pins (SOP8: pin5 and pin6) should be connected in PCB layout.
HIGH CONSTANT CURRENT LED DRIVER with ERROR DETECTION
Version:A.002
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Page 2
DD312
Maximum Ratings (Ta=25°C, Tj(max) = 125°C)
CHARACTERISTIC
SYMBOL
RATING
UNIT
Supply Voltage
VDD
-0.3 ~ 18
Input Voltage
VIN
-0.3 ~ VDD+0.3
Output Current
Iout
1.0
Output Voltage
Vout
-0.3 ~ 18
Enable Voltage
VEN
-0.3 ~ 18
Output Enable Frequency
FEN
1
MHz
GND Terminal Current
IGND
1.01
A
Pd
3.27 ( TO-252 )
1.67 ( SOP8 EP)
0.58(MSOP8)
1.02 ( SOP8)
W
30.6 ( TO-252 )
60 ( SOP8 EP)
172(MSOP8)
97.1 ( SOP8)
°C/W
V
A
V
Power Dissipation
Thermal Resistance (Junction to Air)
Rth(j-a)
*1
Operating Temperature
Top
-40 ~ 85
Storage Temperature
Tstg
-55 ~ 150
°C
Recommended Operating Condition
CHARACTERISTIC
Supply Voltage
SYMBOL
CONDITION
MIN.
TYP.
MAX.
UNIT
VDD
⎯
5.0
⎯
18
V
1.0
⎯
⎯
Driver On
Output Voltage
Vout
Driver Off
Output Current
Iout
*2
*3
OUT
VIH
Input Enable Voltage
⎯
⎯
18
⎯
⎯
1.0
3.0
⎯
18
A
VDD = 5V ~ 18V
VIL
Input Enable Frequency
V
FEN
Ven > 3.0V
V
-0.3
⎯
1.0
DC
⎯
1
MHz
*1
Base on JEDEC high conductivity test board (4-layer) simulation.
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 (18V).
*2
HIGH CONSTANT CURRENT LED DRIVER with ERROR DETECTION
Version:A.002
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Page 3
DD312
Electrical Characteristics (Ta = 25°C unless otherwise noted)
CHARACTERISTIC
SYMBOL
Input Enable Voltage “H” Level
CONDITION
MIN.
TYP.
MAX.
3.0
⎯
18
VEN(IH)
VDD = 5V ~ 18V
Input Enable Voltage “L” Level
Output Leakage Current
Output Current Skew
(Chip-to-Chip)
*1
Output Voltage Regulation
VEN(IL)
UNIT
V
-0.3
⎯
1.0
IOL
Vout = 18 V
Ven = 0 V
⎯
⎯
1.0
uA
IOL1
Vout = 1.0 V
REXT = 10 Ω
⎯
⎯
±5
%
% / Vout
REXT = 0.5 Ω
Vout = 0.8 V ~ 3 V
⎯
0.1
1
%/V
Supply Voltage Regulation
% / VDD
Alarm threshold temperature
REXT = 0.5 Ω
Talm
⎯
⎯
2
⎯
110
⎯
°C
⎯
180
⎯
°C
REXT = 0.5 KΩ
Shutdown threshold temperature
Supply Current
*1
*2
*2
Tstd
IDD1
VDD = 5 V
REXT = 0.5 Ω
⎯
1.2
⎯
IDD2
VDD = 12 V
REXT = 0.5 Ω
⎯
2.0
⎯
IDD3
VDD = 18 V
REXT = 0.5 Ω
⎯
2.8
⎯
mA
Chip-to-Chip skew is defined as the range into which any output current of any IC falls.
IO excluded.
HIGH CONSTANT CURRENT LED DRIVER with ERROR DETECTION
Version:A.002
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Page 4
DD312
Switching Characteristics (Ta = 25°C unless otherwise noted)
CHARACTERISTIC
Propagation Delay
(‘L to ‘H’)
Propagation Delay
(‘H’ to ‘L’)
SYMBOL
CONDITION
MIN.
TYP.
MAX.
EN-to-OUT
(Driver On)
tpLH
VIH = VDD
⎯
166
⎯
EN-to-OUT
(Driver Off)
tpHL
⎯
150
⎯
Output Current Rise Time
UNIT
VIL = GND
tor
REXT = 0.5 Ω
VL = 5.0 V
ns
⎯
270
⎯
⎯
140
⎯
RL = 8 Ω
Output Current Fall Time
tof
CL = 13 pF
Transient Characteristics
VEN
HIGH CONSTANT CURRENT LED DRIVER with ERROR DETECTION
Version:A.002
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Page 5
DD312
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 up to 1A. Notice that the
output current is a little increasing or decreasing until the device temperature and ambient
temperature are balance. The maximum power dissipation of the determined external resistor should
be large enough than the actual power consumption: 0.5(V ) × Iout ( A) need to be considered.
Approximate output current value can be calculated by following equation:
Output Current as a Function of REXT value
1100
1000
900
Vout = 1.0 V
Iout ( mA )
800
700
600
500
400
300
200
100
0
0
1
2
3
4
5
6
7
8
9
10
11
1.6
1.8
2.0
REXT( Ω )
Output Current as a Function of Output Voltage
1.2
Iout (A)
1.0
0.8
0.6
0.4
0.2
0.0
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
Vout (Volt)
HIGH CONSTANT CURRENT LED DRIVER with ERROR DETECTION
Version:A.002
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Page 6
DD312
Alarm Function (SOP8 Only)
It can detect the operating status by connecting a pull-high resistor to the open-drain ALARM
pin. The ALARM pin is kept ‘H’ for normal conditions, and shifted to ‘L’ if there is any failure like
LED open, overheating or both occurrence. User can determine the different status from the truth
table below:
ALARM
EN
Status
H
don’t care
Normal Operation
HÆL
H
LED Open or Thermal issue
HÆL
L
Thermal Alarm or Shutdown
Thermal Alarm and Shutdown
During operation, when the junction temperature of the IC will reach about 110℃, the ALARM
pin will shift to low level and produce a warning signal. Suggested cooling measures is to start the
fan, lower the output currents and etc. If no cooling measures were activated, the junction
temperature might continue to rise. Once it reaches approximately above 180℃, it will cause the
driver to shutdown all the outputs. Basically, the IC will cool down and return to the safe operating
temperature which is approximately below 110℃. The ALARM pin will reset to high level, disable
the warning, and restart all the outputs at the same time. Operation in the thermal situation for a long
time may cause chip damage permanently.
HIGH CONSTANT CURRENT LED DRIVER with ERROR DETECTION
Version:A.002
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Page 7
DD312
Power Dissipation
Notice that 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:
Pd(max)(Watt) =
Tj(junction temperature)(max)(°C)– Ta(ambient temperature)(°C)
Rth(junction-to-air thermal resistance)(°C/Watt)
The relationship between power dissipation and operating temperature can be refer to the figure
below:
4
TO-252
Power Dissipation Pd(W)
3.5
Tj(max)=125 °C
Rth(TO-252)=30.6 °C/Watt
3
Rth(SOP8 EP)=60 °C/Watt
2.5
Rth(MSOP8)=172 °C/Watt
2
SOP8 EP
1.5
Rth(SOP8 )=97.1°C/Watt
SOP8
1
MSOP8
0.5
0
0
20
40
60
80
100
120
Ambient Temperature Ta(℃)
Based on the Pd(max), the maximum allowable voltage of output terminal can be determined by the
following equation:
HIGH CONSTANT CURRENT LED DRIVER with ERROR DETECTION
Version:A.002
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Page 8
DD312
Typical Application
HIGH CONSTANT CURRENT LED DRIVER with ERROR DETECTION
Version:A.002
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DD312
Typical Application
HIGH CONSTANT CURRENT LED DRIVER with ERROR DETECTION
Version:A.002
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DD312
Typical Application
HIGH CONSTANT CURRENT LED DRIVER with ERROR DETECTION
Version:A.002
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Page 11
DD312
Package Outline Dimension
Unit: inch/mm
TO-252
DIMENSIONS IN INCH
DIMENSIONS IN MM
SYMBOLS
MIN.
MAX.
MIN.
MAX.
A
0.086
0.094
2.184
2.388
A1
0.000
0.005
0.000
0.127
A2
0.040
0.050
1.016
1.270
b
b2
0.020 TYP
0.205
0.508 TYP
0.215
5.207
5.461
c
0.018
0.023
0.457
0.584
c1
0.018
0.023
0.457
0.584
D
0.210
0.220
5.334
5.588
D1
0.180
-
4.572
-
E
0.250
0.265
6.350
6.731
E1
0.150
-
3.810
e
0.050 BSC
1.270 BSC
H
0.370
0.410
9.398
10.414
L
0.055
0.070
1.397
1.778
L1
0.105 REF
2.667 REF
L2
0.06
0.08
1.524
2.032
Θ
0°
4°
0°
4°
HIGH CONSTANT CURRENT LED DRIVER with ERROR DETECTION
Version:A.002
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Page 12
DD312
Unit: inch
SOP8 (exposed pad)
HIGH CONSTANT CURRENT LED DRIVER with ERROR DETECTION
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Page 13
DD312
MSOP8
Unit: mm
SYMBOLS
MIN.
MAX
A
1.100
A1
0.000
0.150
A2
0.750
0.950
b
0.300 BSC
D
3.000 BSC
E
4.900 BSC
E1
3.000 BSC
e
0.650 BSC
L
0.400
L1
θ°
0.800
0.950 REF
0
HIGH CONSTANT CURRENT LED DRIVER with ERROR DETECTION
8
Version:A.002
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Page 14
DD312
Unit: mm
SOP8
SYMBOLS
MIN.
MAX
A
1.346
1.753
A1
0.102
0.254
A2
1.346
1.499
b
0.406 BSC
c
0.203 BSC
D
4.801
4.978
E
3.810
3.988
1.270 BSC
e
H
5.791
6.198
L
0.406
1.270
θ°
0
8
HIGH CONSTANT CURRENT LED DRIVER with ERROR DETECTION
Version:A.002
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Page 15
DD312
Product Ordering Information
Part Number
Package Type
Number / Weight ( typ.)
Tube / Tray
Reel ( Box included )
DD312-SOP
SOP8-150-1.27
100pcs / Tube
0.018kg ± 5%
－
DD312-TO252EX
TO252-1.27
(Exposed Pad)
80pcs / Tube
0.045kg ± 5%
－
HIGH CONSTANT CURRENT LED DRIVER with ERROR DETECTION
Version:A.002
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Page 16
DD312
DD312-SOP Package and Weight（4 Boxes Set）
SOP8 - 150 - 1.27
IC
SOP
100 pcs ICs per Tube
Tube
53cm
Box
100 Tubes per Box
17cm
10cm
61cm
4 Boxes per Carton
Carton
35cm
24cm
64cm
Weight
Item
1
2
3
4
Description
100 pcs DD312-SOP per Tube
Net Weight of one Box
Net Weight of one Carton
Per Carton Set ( 4 Boxes, 40,000 pcs )
HIGH CONSTANT CURRENT LED DRIVER with ERROR DETECTION
Weight ( Kg )
0.018±5%
0.40±5%
1.24±5%
10.04±5%
Version:A.002
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Page 17
DD312
DD312-SOP Package and Weight（6 Boxes Set）
SOP8 - 150 - 1.27
IC
SOP
100 pcs ICs per Tube
Tube
53cm
Box
100 Tubes per Box
17cm
10cm
61cm
6 Boxes per Carton
Carton
35cm
34cm
64cm
Weight
Item
1
2
3
4
Description
100 pcs DD312-SOP per Tube
Net Weight of one Box
Net Weight of one Carton
Per Carton Set ( 6 Boxes, 60,000 pcs )
HIGH CONSTANT CURRENT LED DRIVER with ERROR DETECTION
Weight ( Kg )
0.018±5%
0.40±5%
1.44±5%
14.64±5%
Version:A.002
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Page 18
DD312
DD312-TO252EX Package and Weight（4 Boxes Set）
TO252 - 1.27 ( Exposed Pad )
IC
TO252
80 pcs ICs per Tube
Tube
53cm
Box
40 Tubes per Box
17cm
10cm
61cm
4 Boxes per Carton
Carton
35cm
24cm
64cm
Weight
Item
1
2
3
4
Description
80 pcs DD312-TO252EX per Tube
Net Weight of one Box
Net Weight of one Carton
Per Carton Set ( 4 Boxes, 12,800 pcs )
HIGH CONSTANT CURRENT LED DRIVER with ERROR DETECTION
Weight ( Kg )
0.045±5%
0.40±5%
1.24±5%
10.04±5%
Version:A.002
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Page 19
DD312
DD312-TO252EX Package and Weight（6 Boxes Set）
TO252 - 1.27 ( Exposed Pad )
IC
TO252
80 pcs ICs per Tube
Tube
53cm
40 Tubes per Box
Box
17cm
10cm
6 Boxes per Carton
61cm
Carton
35cm
34cm
64cm
Weight
Item
1
2
3
4
Description
80 pcs DD312-TO252EX per Tube
Net Weight of one Box
Net Weight of one Carton
Per Carton Set ( 6 Boxes, 19,200 pcs )
HIGH CONSTANT CURRENT LED DRIVER with ERROR DETECTION
Weight ( Kg )
0.045±5%
0.40±5%
1.44±5%
14.64±5%
Version:A.002
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Page 20
DD312
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.
Silicon Touch Technology, Inc. reserve the right to make changes to their products
or to discontinue any product or service without notice, and advise customers to
obtain the latest version of relevant information to verify, before placing orders,
that information being relied on is current and complete.
HIGH CONSTANT CURRENT LED DRIVER with ERROR DETECTION
Version:A.002
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Page 21