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DD312
Version : A.001 Issue Date : 2007/07/18 File Name : SP-DD312-A.001.doc Total Pages : 20
HIGH CONSTANT CURRENT LED DRIVER with ERROR DETECTION
9 7 1
SILICON TOUCH TECHNOLOGY INC.
9-7F-1, Prosperity Road I, Science Based Industrial Park, Hsin-Chu, Taiwan 300, R.O.C. Tel886-3-5645656 Fax886-3-5645626

SILICON TOUCH TECHNOLOGY INC.
9 7 1 9-7F-1, Prosperity Road, Hsin-Chu, Taiwan, R.O.C. Tel886-3-5645656 Fax886-3-5645626
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 Maximum output current: 1A (determined by the external resistor) Minimum output voltage: 1V (Iout = 1A) Maximum output voltage: 18V 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 LED architectural or entertainment lighting LED general or specialty illumination LED backlighting applications
Package Types TO-252 or SOP8 (with thermal pad)
HIGH CONSTANT CURRENT LED DRIVER
Version:A.001
Page 1
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SILICON TOUCH TECHNOLOGY INC.
9 7 1 9-7F-1, Prosperity Road, Hsin-Chu, Taiwan, R.O.C. Tel886-3-5645656 Fax886-3-5645626
DD312
Block Diagram
Pin Connection
GND EN OUT RESERVED
1 2 3 4
8
VCC ALARM REXT REXT
SOP8
7 6 5
Pin Description
PIN No. TO252:3/SOP8:1 TO252:5/SOP8:2 TO252:2/SOP8:3 SOP8:4 TO252:1/SOP8:5,6 PIN NAME GND EN OUT RESERVED REXT*1 Ground terminal. Output current enable terminal. 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) `H' for normal conditions, `L' for LED open or chip overheated. Power supply terminal. FUNCTION
SOP8:7
ALARM
TO252:4/SOP8:8
VCC
*1
Notice that both REXT pins (SOP8: pin5 and pin6) should be connected in PCB layout. Version:A.001 Page 2
HIGH CONSTANT CURRENT LED DRIVER
Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement.

SILICON TOUCH TECHNOLOGY INC.
9 7 1 9-7F-1, Prosperity Road, Hsin-Chu, Taiwan, R.O.C. Tel886-3-5645656 Fax886-3-5645626
DD312
Maximum Ratings (Ta=25C, Tj(max) = 125C)
CHARACTERISTIC Supply Voltage Input Voltage Output Current Output Voltage Enable Voltage Output Enable Frequency GND Terminal Current Power Dissipation Thermal Resistance (Junction to Air) Operating Temperature Storage Temperature SYMBOL VDD VIN Iout Vout VEN FEN IGND Pd Rth(j-a) Top Tstg
*1
RATING -0.3 ~ 18
UNIT V
-0.3 ~ VDD+0.3 1.0 -0.3 ~ 18 V -0.3 ~ 18 1 1.01 3.27 ( TO-252 ) 1.67 ( SOP8 ) 30.6 ( TO-252 ) 60 ( SOP8 ) -40 ~ 85 -55 ~ 150 MHz A W C/W A
C
Recommended Operating Condition
CHARACTERISTIC Supply Voltage SYMBOL VDD CONDITION Driver On Output Voltage Vout Driver Off Output Current Iout VIH Input Enable Voltage VIL Input Enable Frequency FEN Ven > 3.0V VDD = 5V ~ 18V -0.3 DC 1.0 1 MHz OUT
*2 *3
MIN. 5.0 1.0 3.0
TYP.
MAX. 18
UNIT V
V 18 1.0 18 V A
*1 *2
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). HIGH CONSTANT CURRENT LED DRIVER Version:A.001 Page 3
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SILICON TOUCH TECHNOLOGY INC.
9 7 1 9-7F-1, Prosperity Road, Hsin-Chu, Taiwan, R.O.C. Tel886-3-5645656 Fax886-3-5645626
DD312
Electrical Characteristics (Ta = 25C unless otherwise noted)
CHARACTERISTIC Input Enable Voltage "H" Level SYMBOL VEN(IH) VDD = 5V ~ 18V Input Enable Voltage "L" Level VEN(IL) Vout = 18 V Ven = 0 V Vout = 1.0 V REXT = 10 REXT = 0.5 Vout = 0.8 V ~ 3 V -0.3 1.0 CONDITION MIN. 3.0 TYP. MAX. 18 V UNIT
Output Leakage Current Output Current Skew (Chip-to-Chip)
*1
IOL
1.0
uA
IOL1
5
%
Output Voltage Regulation
% / Vout
0.1
1 %/V
Supply Voltage Regulation
% / VDD
REXT = 0.5
2
Alarm threshold temperature
Talm REXT = 0.5 K
110
C
Shutdown threshold temperature
Tstd
180
C
IDD1
VDD = 5 V REXT = 0.5 VDD = 12 V REXT = 0.5 VDD = 18 V REXT = 0.5
1.2
Supply Current
*2
IDD2
2.0
mA
IDD3
2.8
*1 *2
Chip-to-Chip skew is defined as the range into which any output current of any IC falls. IO excluded. Version:A.001 Page 4
HIGH CONSTANT CURRENT LED DRIVER
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SILICON TOUCH TECHNOLOGY INC.
9 7 1 9-7F-1, Prosperity Road, Hsin-Chu, Taiwan, R.O.C. Tel886-3-5645656 Fax886-3-5645626
DD312
Switching Characteristics (Ta = 25C unless otherwise noted)
CHARACTERISTIC Propagation Delay (`L to `H') Propagation Delay (`H' to `L') Output Current Rise Time EN-to-OUT (Driver On) EN-to-OUT (Driver Off) SYMBOL tpLH CONDITION VIH = VDD VIL = GND tpHL REXT = 0.5 VL = 5.0 V RL = 8 Output Current Fall Time tof CL = 13 pF 140 150 ns 270 MIN. TYP. 166 MAX. UNIT
tor
Transient Characteristics
VEN
HIGH CONSTANT CURRENT LED DRIVER
Version:A.001
Page 5
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SILICON TOUCH TECHNOLOGY INC.
9 7 1 9-7F-1, Prosperity Road, Hsin-Chu, Taiwan, R.O.C. Tel886-3-5645656 Fax886-3-5645626
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 ) x 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 900 800 700 600 500 400 300 200 100 0 0 1 2 3 4 5 6 7 8 9 10 11
Vout = 1.0 V
Iout ( mA )
REXT( )
Output Current as a Function of Output Voltage
1.2 1.0
Iout (A)
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 1.6 1.8 2.0
Vout (Volt)
HIGH CONSTANT CURRENT LED DRIVER
Version:A.001
Page 6
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SILICON TOUCH TECHNOLOGY INC.
9 7 1 9-7F-1, Prosperity Road, Hsin-Chu, Taiwan, R.O.C. Tel886-3-5645656 Fax886-3-5645626
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 H HL HL EN don't care H L Status
Normal Operation LED Open or Thermal issue 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
Version:A.001
Page 7
Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement.

SILICON TOUCH TECHNOLOGY INC.
9 7 1 9-7F-1, Prosperity Road, Hsin-Chu, Taiwan, R.O.C. Tel886-3-5645656 Fax886-3-5645626
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:
4.0
Power Dissipation Pd(W)
3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0
TO-252
Tj(max)=125 C Rth(TO-252)=30.6 C/Watt Rth(SOP8)=60 C/Watt
SOP8
20
40
60
80
100
120
140
Ambient Temperature Ta(C)
Based on the Pd(max), the maximum allowable voltage of output terminal can be determined by the following equation:
HIGH CONSTANT CURRENT LED DRIVER
Version:A.001
Page 8
Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement.

SILICON TOUCH TECHNOLOGY INC.
9 7 1 9-7F-1, Prosperity Road, Hsin-Chu, Taiwan, R.O.C. Tel886-3-5645656 Fax886-3-5645626
DD312
Typical Application
HIGH CONSTANT CURRENT LED DRIVER
Version:A.001
Page 9
Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement.

SILICON TOUCH TECHNOLOGY INC.
9 7 1 9-7F-1, Prosperity Road, Hsin-Chu, Taiwan, R.O.C. Tel886-3-5645656 Fax886-3-5645626
DD312
Typical Application
HIGH CONSTANT CURRENT LED DRIVER
Version:A.001
Page 10
Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement.

SILICON TOUCH TECHNOLOGY INC.
9 7 1 9-7F-1, Prosperity Road, Hsin-Chu, Taiwan, R.O.C. Tel886-3-5645656 Fax886-3-5645626
DD312
Typical Application
HIGH CONSTANT CURRENT LED DRIVER
Version:A.001
Page 11
Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement.

SILICON TOUCH TECHNOLOGY INC.
9 7 1 9-7F-1, Prosperity Road, Hsin-Chu, Taiwan, R.O.C. Tel886-3-5645656 Fax886-3-5645626
DD312
Package Outline Dimension
TO-252 Unit: inch/mm
DIMENSIONS IN INCH SYMBOLS A A1 A2 b b2 c c1 D D1 E E1 e H L L1 L2 MIN. 0.086 0.000 0.040 MAX. 0.094 0.005 0.050
DIMENSIONS IN MM MIN. 2.184 0.000 1.016 MAX. 2.388 0.127 1.270
0.020 TYP 0.205 0.018 0.018 0.210 0.180 0.250 0.150 0.050 BSC 0.370 0.055 0.410 0.070 0.215 0.023 0.023 0.220 0.265 -
0.508 TYP 5.207 0.457 0.457 5.334 4.572 6.350 3.810 1.270 BSC 9.398 1.397 10.414 1.778 5.461 0.584 0.584 5.588 6.731
0.105 REF 0.06 0 0.08 4
2.667 REF 1.524 0 2.032 4
HIGH CONSTANT CURRENT LED DRIVER
Version:A.001
Page 12
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SILICON TOUCH TECHNOLOGY INC.
9 7 1 9-7F-1, Prosperity Road, Hsin-Chu, Taiwan, R.O.C. Tel886-3-5645656 Fax886-3-5645626
DD312
Package Outline Dimension
SOP8 (exposed pad) Unit: inch
HIGH CONSTANT CURRENT LED DRIVER
Version:A.001
Page 13
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SILICON TOUCH TECHNOLOGY INC.
9 7 1 9-7F-1, Prosperity Road, Hsin-Chu, Taiwan, R.O.C. Tel886-3-5645656 Fax886-3-5645626
DD312
Product Ordering Information
Part Number
Package Type
Number / Weight ( typ.) Tube / Tray Reel ( Box included )
DD312-SOP
SOP8-150-1.27 TO252-1.27 (Exposed Pad)
100pcs / Tube 0.018kg 5% 80pcs / Tube 0.045kg 5%
DD312-TO252EX
HIGH CONSTANT CURRENT LED DRIVER
Version:A.001
Page 14
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SILICON TOUCH TECHNOLOGY INC.
9 7 1 9-7F-1, Prosperity Road, Hsin-Chu, Taiwan, R.O.C. Tel886-3-5645656 Fax886-3-5645626
DD312
DD312-SOP Package and Weight4 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 ) Weight ( Kg ) 0.0185% 0.405% 1.245% 10.045%
HIGH CONSTANT CURRENT LED DRIVER
Version:A.001
Page 15
Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement.

SILICON TOUCH TECHNOLOGY INC.
9 7 1 9-7F-1, Prosperity Road, Hsin-Chu, Taiwan, R.O.C. Tel886-3-5645656 Fax886-3-5645626
DD312
DD312-SOP Package and Weight6 Boxes Set
SOP8 - 150 - 1.27 IC
SOP
100 pcs ICs per Tube
Tube
53cm
Box
100 Tubes per Box
17cm 10cm
61cm
Carton
35cm 34cm
6 Boxes per Carton
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 ) Weight ( Kg ) 0.0185% 0.405% 1.445% 14.645%
HIGH CONSTANT CURRENT LED DRIVER
Version:A.001
Page 16
Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement.

SILICON TOUCH TECHNOLOGY INC.
9 7 1 9-7F-1, Prosperity Road, Hsin-Chu, Taiwan, R.O.C. Tel886-3-5645656 Fax886-3-5645626
DD312
DD312-TO252EX Package and Weight4 Boxes Set
TO252 - 1.27 ( Exposed Pad )
IC
TO252
80 pcs ICs per Tube
Tube
53cm
Box
17cm 10cm
40 Tubes per Box
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 ) Weight ( Kg ) 0.0455% 0.405% 1.245% 10.045%
HIGH CONSTANT CURRENT LED DRIVER
Version:A.001
Page 17
Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement.

SILICON TOUCH TECHNOLOGY INC.
9 7 1 9-7F-1, Prosperity Road, Hsin-Chu, Taiwan, R.O.C. Tel886-3-5645656 Fax886-3-5645626
DD312
DD312-TO252EX Package and Weight6 Boxes Set
TO252 - 1.27 ( Exposed Pad ) IC
TO252
80 pcs ICs per Tube
Tube
53cm
Box
17cm 10cm
40 Tubes per Box
61cm
6 Boxes per Carton
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 ) Weight ( Kg ) 0.0455% 0.405% 1.445% 14.645%
HIGH CONSTANT CURRENT LED DRIVER
Version:A.001
Page 18
Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement.

SILICON TOUCH TECHNOLOGY INC.
9 7 1 9-7F-1, Prosperity Road, Hsin-Chu, Taiwan, R.O.C. Tel886-3-5645656 Fax886-3-5645626
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.
HIGH CONSTANT CURRENT LED DRIVER
Version:A.001
Page 19
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