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APW7128
30V, 1.2MHz, White LED Driver Features
* * * * * * * * * * * * *
Wide Input Voltage Range from 2.7V to 21V High Current-Limit up to 3.5A 0.5V Reference Voltage with 3% System Accuracy 50m Integrated N-FET Fixed 1.2MHz Switching Frequency High Efficiency up to 95% Open-LED Protection Under Voltage Lockout Protection ALS Control Input Pin Over Temperature Protection Low Shutdown Current: <1uA 3mm x 3mm DFN-10 Package Lead Free and Green Devices Available (RoHS Compliant)
General Description
The APW7128 is the high power and high efficiency boost converter with an integrated 30V FET ideal for LCD panel backlighting applications. 30V output voltage allows for 8 high-power LEDs in series, and 3.5A inductor current limit allows for more LED strings connected in parallel. The low 0.5V feedback voltage offers higher efficiency in WLED driver applications. The wide input range from 2.7V to 21V made APW7128 a perfect solution for various applications such as LCD monitor and portable devices. The OVP pin monitors the output voltage to protect IC during open load and FB pin short circuit operations. The APW7128 provides the ALS pin to simplify the interface to an ambient light sensor for automatic dimming. The APW7128 is available in the thermally enhanced DFN-10 lead 3mm x 3mm package.
Pin Configuration
FB 1 10 ALS 9 GND Metal LX Pad (Bottom) 8 BP 7 VIN 6 LX
Applications
*
Display Backlighting - Automotive - LCD Monitors - Notebook Displays Portable Displays
COMP 2 OVP 3 EN 4 PGND 5
*
APW7128 DFN3x3-10 Top View
Ordering and Marking Information
APW7128 Assembly Material Handling Code Temperature Range Package Code
APW 7128 XXXXX
Package Code QA: DFN3x3-10 Operating Ambient Temperature Range I : -40 to 85 C Handling Code TR : Tape & Reel Assembly Material L : Lead Free Device G : Halogen and Lead Free Device XXXXX - Date Code
APW7128 QA:
Note: ANPEC lead-free products contain molding compounds/die attach materials and 100% matte tin plate termination finish; which are fully compliant with RoHS. ANPEC lead-free products meet or exceed the lead-free requirements of IPC/JEDEC J-STD-020C for MSL classification at lead-free peak reflow temperature. ANPEC defines "Green" to mean lead-free (RoHS compliant) and halogen free (Br or Cl does not exceed 900ppm by weight in homogeneous material and total of Br and Cl does not exceed 1500ppm by weight). ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise customers to obtain the latest version of relevant information to verify before placing orders. Copyright (c) ANPEC Electronics Corp. Rev. A.1 - Apr., 2008 1 www.anpec.com.tw
APW7128
Absolute Maximum Ratings
Symbol VIN VLX VOVP VBP VEN VALS TJ TSTG TL VIN pin to GND LX pin to PGND OVP pin to GND BP pin to GND EN pin to GND ALS pin to GND PGND to GND Maximum Junction Temperature Storage Temperature Range Maximum Lead Soldering Temperature, 10 Seconds
(Note 1)
Rating -0.3 to 30 -0.3 to 30 -0.3 to 30 -0.3 to 6 -0.3 to 30 -0.3 to 6 -0.3 to 0.3 150 -65 to 150 260 Unit V V V V V V V C C C
Parameter
Note 1: Stresses beyond the absolute maximum rating may damage the device and exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Thermal Characteristics (Note 2)
Symbol JA Parameter Junction to Ambient Thermal Resistance in Free Air Package DFN3x3-10 Typical Value 80 Unit C/W
Note 2: JA is measured with the component mounted on a high effective thermal conductivity test board in free air. The exposed pad is soldered directly on the PCB.
Recommended Operating Conditions
Symbol VIN VOUT TJ TA Parameter VIN Supply Voltage, (VIN=BP) VIN Supply Voltage, (BP is open) Output Voltage Operating Ambient Temperature Operating Junction Temperature Rating 2.7 to 5.5 3.7 to 21V up to 30 -40 to 85 -40 to 125 Unit V V V C C
Electrical Characteristics
VIN=6V, TA = -40 to 85C, unless otherwise specified. Typical values refer to TA =25C. Symbol Parameter BP Under Voltage Lockout Threshold UVLO Hysteresis IVIN VIN Supply Current EN=5V, switching EN=0V Test Conditions Min Typ Max Unit
INPUT SUPPLY CURRENT AND UVLO VIN rising 2.4 2.5 100 9 2.6 15 1 V mV mA uA
ERROR AMPLIFIER gm ICOMP VFB Error Amplifier Transconductance COMP Output Current FB Voltage sourcing and sinking, VCOMP=1.5V 485 350 50 500 515 uA/V uA mV
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APW7128
Electrical Characteristics (Cont.)
VIN=6V, TA = -40 to 85C, unless otherwise specified. Typical values refer to TA =25C. Symbol Parameter Minimum FB Voltage IFB FB Input Bias Current FB Line Regulation INTERNAL POWER SWITCH Power Switch Current-Limit RDS(ON) Power Switch On Resistance LX Leakage Current FSW DMAX ALS ALS Ratio ALS Pin Leakage OUTPUT OVERVOLTAGE PROTECTION Over Voltage Threshold OVP Hysteresis OVP Leakage Current CONTROL LOGIC PIN EN High-Level Input Voltage EN Low-Level Input Voltage EN Leakage Current THERMAL SHUTDOWN Thermal Shutdown Threshold Thermal Shutdown Hysteresis 150 50
Test Conditions VALS=0.3V
Min 188 -
Typ 200 0.02
Max 212 1 0.04
Unit mV A %/V
VIN=2.7V to 21V
-
2.5 VLX=30V 0.9 92
3.5 50 1.2 95
4.5 100 1 1.5 98
A m A MHz %
Switching Frequency LX Maximum Duty Cycle
VALS=1V, VALS/VFB VALS=5V
2.9 -
3 -
3.1 1
V/V A V V A V V A
30 2 -
32 3 -
34 4 30
2.4 VEN=21V -
-
0.4 1
C C
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APW7128
Typical Operating Characteristics
VIN Supply Current vs. VIN Supply Voltage
9.0 8.5
VIN Supply Current vs. VIN Supply Voltage
800 no switching
VIN Supply Current (mA)
switching 7.5 6.5 5.5 4.5 3.5 2.5 0 5 10 15 20 25
VIN Supply Current (uA)
700
600
500
400 0 5 10 15 20 25
VIN Supply Voltage (V)
VIN Supply Voltage (V)
Efficiency vs. Load Current
100 95
FB Voltage vs. VIN Supply Voltage
0.510
Efficiency (%)
85 80 75 70 65 60 0
VIN=6V
FB Voltage (V)
8LEDs in series 0.9 1
90
VIN=12V
VIN=19V
0.505
0.500
0.495
0.490
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
0
5
10
15
20
25
Load Current (A)
FB Voltage vs. ALS Input Voltage
0.55 0.50
VIN Supply Voltage (V)
EN Threshold Voltage vs. VIN Supply Voltage
2.0
FB Voltage (V)
0.45 0.40 0.35 0.30 0.25 0.20 0.15 0 0.5 1 1.5 2
EN Threshold Voltage (V)
1.8 EN High Threshold 1.6
1.4
EN Low Threshold
1.2
1.0 2 6 10 14 18 22
ALS Input Voltage (V)
VIN Supply Voltage (V)
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APW7128
Typical Operating Characteristics (Cont.)
Power Switching On Resistance vs. VIN Supply Voltage
70
Switching Frequency vs. VIN Supply Voltage
1.40
Power Switch On Resistance (m)
Switching Frequency (MHz)
10
60 50
1.35
40 30
1.30
1.25
20 10
1.20
2
6
14
18
22
0
5
10
15
20
25
VIN Supply Voltage (V)
Switching Frequency vs. Junction Temperature
1.50 1.45
800 750 700
VIN Supply Voltage (V)
VIN Supply Current vs. Junction Temperature
Switching Frequency (MHz)
no switching
1.40 1.35 1.30 1.25 1.20 1.15 1.10 1.05 1.00 -40 -20 0 20 40 60 80 100 120 140 160
VIN Supply Current (uA)
650 600 550 500 450 400 350 300 250 200 -40 -20 0 20 40 60 80 100 120 140 160
Junction Temperature (oC)
Power Switching On Resistance vs. Junction Temperature
100
0.510 0.508
Junction Temperature (oC)
FB Voltage vs. Junction Temperature
Power Switch On Resistance (m)
80
0.506
FB Voltage (V)
0.504 0.502 0.500 0.498 0.496
60
40
20
0.494 0.492
0 -40 -20 0 20 40 60 80 100 120 140 160
0.490 -40 -20 0 20 40 60 80 100 120 140 160
Junction Temperature (J)
Junction Temperature (oC)
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APW7128
Operating Waveforms
Refer to the typical application circuit. The test condition is VIN=5V, TA= 25oC unless otherwise specified.
Start-up
Shutdown
VEN 1 VOUT
1
VEN
VOUT
2 IIN 4
2
4
IIN
VIN=12V, L=10uH, CCOMP=0.22uF CH1: VEN, 10V/div, DC CH2: VOUT, 10V/div, DC CH4: IIN, 500mA/div, DC TIME: 1ms/div
VIN=12V, L=10uH, CCOMP=0.22uF CH1: VEN, 10V/div, DC CH2: VOUT, 10V/div, DC CH4: IIN, 500mA/div, DC TIME: 10ms/div
Overvoltage Protection
Switching Waveforms
VCOMP 1
1
2
VOUT
3
2 4
IIN
4
Output is open CH1: VCOMP, 0.5V/div, DC CH2: VOUT, 10V/div, DC CH4: IIN, 100mA/div, DC TIME: 10ms/div
VIN=12V, L=10uF, IOUT=160mA CH1: VIN, 50mV/div, AC CH2: VOUT, 200mV/div, AC CH3: VLX, 20V/div, DC CH4: IL, 200mA/div, DC TIME: 0.5us/div
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APW7128
Pin Description
PIN NO. 1 2 3 4 5 6 7 8 9 10 NAME FB COMP OVP EN PGND LX VIN BP GND ALS FUNCTION Regulator Feedback Pin. Connect a current sense resistor to GND to set the LED current. Error Amplifier Output. Connect a 0.22F capacitor for compensation and soft-start. When EN is pulled low, an internal switch will discharge the COMP voltage to 0V. Output Over Voltage Monitor Pin. Tie to VOUT for OVP function. Enable Input Pin. Pull EN above 2.4V to enable the device; pull EN below 0.4V to disable the device. The EN pin cannot be left floating. Power Ground. Source of the internal N-channel power MOSFET. Internal Power MOSFET Drain. Supply Voltage Input. Output of The Internal 5V Regulator. Connect a 1F bypass capacitor to GND. Do not apply an external load to BP. Signal Ground. Ambient Light Sensor Input. Allow the light sensor to control the FB voltage for LED dimming. If the ALS function is not used, tie the ALS pin to BP pin.
Block Diagram
BP VIN OVP
LDO
UVLO 0.9V LX
EN Control Logic Thermal Shutdown
GND Oscillator PGND FB COMP 0.5V
ALS
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APW7128
Typical Application Circuit
6V to 21V
L1 10uH
D1
Up to 8 Strings
C1 10uF 10 7 ON OFF C2 1uF PWM brightness control 4 9 8 ALS VIN EN GND LX OVP COMP PGND FB 3V 0V VADJ 6 3 2 5 1
C5 1uF
Up to 8 LEDs per String C3 0.22uF
BP APW7128
R3 120k R4 10k
R2 24k C4 0.1uF
R1 I LED(max)=20mA 3.75 ILED(min)=0mA
Figure1. Analog Dimming with PWM Voltage
VDD
6V to 21V C1 10uF
L1 10uH
D1
Up to 8 Strings
ALS R2 ON
10 7 4 9 8 C2 1uF
ALS VIN EN GND
LX OVP COMP PGND FB
6 3 2 5 1
C5 1uF
Up to 8 LEDs per String C3 0.22uF
OFF
BP APW7128
R1 3.125
Figure2. Analog Dimming with External ALS Voltage
Designation L1 C1 C2 C3 C5 D1
Supplier GOTREND Murata Murata Murata Murata Zowie
Part Number GTSD53 GRM31CR61E106K GRM155R61A105K GRM155R60J224KE01 GRM21BR71H105KA12 MSCD104
Specification 10uH, 1.33A X5R, 25V, 10uF X5R, 10V, 1uF X5R, 6.3V. 0.22uF X7R, 50V, 1uF 1.0A, 40V
Wedsite www.gotrend.com.tw www.murata.com www.murata.com www.murata.com www.murata.com www.zowie.com.tw
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APW7128
Function Description
Output Overvoltage Protection If the FB pin is shorted to ground or an LED fails open circuit, output voltage in BOOST mode can increase to potentially damaging voltages. An optional overvoltage protection circuit can be enabled by connection of the OVP pin to the output voltage. The device will stop switching if the output voltage exceeds OVP high threshold and re-start when the output voltage falls below OVP low threshold. During sustained OVP fault conditions, VOUT will saw-tooth between the upper and lower threshold voltages at a frequency determined by the magnitude of current available to discharge the output capacitor. Note that the OVP pin must be connected to output voltage for OVP function. Ambient Light Sensor Interface The APW7128 provides the ALS pin to simplify the interface to an ambient light sensor. The ambient light sensor detects the ambient light and yields a current which is related to the illuminance. Connect a load resistor from the current output of ambient light sensor to ground to provide an output voltage to ALS pin. The ALS voltage will be divided by an internal divider circuit, and the divided ALS voltage will replace the internal reference voltage. The LED current can be calculated by the following equation:
I LED =
1 V ALS x 3 R2
internal thermal sensor circuit will disable the device and allow the device to cool down. When the device' s junction temperature cools by 50C, the internal thermal sense circuit will enable the device, resulting in a pulsed output during continuous thermal protection. Thermal protection is designed to protect the IC in the event of over temperature conditions. For normal operation, the junction temperature cannot exceed TJ=+125 C. Internal 5V LDO The APW7128 provides an internal 5V LDO for the control circuitry, and the output of the internal LDO is BP pin. In normal operation, connect a 1F or greater capacitor to GND is recommended. The internal LDO cannot supply any more current than is required to operate the APW7128. Therefore, do not apply any external load to BP pin. In applications, where the VIN is less than 5.5V, BP should be tied to VIN through a 10 resistor.
Note that the maximum FB voltage is set to 0.5V, and minimum FB voltage is set to 0.2V. If the divided ALS voltage is over 0.5V or less 0.2V, the LED current is limited at:
ILED (MAX ) = 0 .5 V R2
ILED (MIN ) =
0 .2 V R2
where R2 is the resistor from FB to GND. Enable/Disable Pull the EN above 2V to enable the device and pull EN pin below 0.4V to disable the device. In shutdown mode, the internal control circuits are turned off, the quiescent current is below 1uA. Thermal Shutdown When the junction temperature exceeds 150C, the
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APW7128
Application Information
Connecting more LED strings The APW7128 can drive 8 LED strings in parallel and up to 8 LEDs per string (VF<3.5V). Each string must have the same number of LEDs. In the applications that have the same total number of LEDs, more strings and less LEDs in series are more efficiency than less strings and more LEDs in series. Brightness Control The method for dimming the LEDs is to apply a PWM voltage through an RC filter into the FB pin. The RC filter is used to convert the PWM voltage into an analog voltage. The values of the R and C depend upon the frequency of the PWM voltage and the amount of allowable ripple voltage on FB pin. The LED current is proportional to the PWM duty cycle. 0 % duty delivers maximum LED current and 100% duty delivers minimum LED current. The values of R1 and R2 are calculated by the following equations:
R2 = VFB x (ILED(max) x R3 + VADJ(low) - ILED(min) x R3 - VADJ(high)) VADJ(high) x ILED(max) + VFB x ILED(min) - VADJ(low) x ILED(min) - VFB x ILED(max)
V FB x (1 + R2 R2 x V ADJ ( low ) )- R3 R3
Inductor Selection A larger value of inductor will reduce the peak inductor current, resulting in smaller input ripple current, higher efficiency and reducing stress on the internal MOSFET. However, the larger value of inductor has a large dimension, lower saturation current, and higher series resistance. A good rule for determining the inductance is to allow the peak-to-peak ripple current to be approximately 30% to 50% of the maximum input current. Calculate the required inductance value by the equation:
L = ( V - V )x V I x F x V
OUT IN L SW
IN
OUT
IL = (30% - 50%) x IIN
IIN = VOUTxILOAD VIN x
It is necessary to choose an inductor that ensures the inductor saturation current rating to exceed the peak inductor current for the application. To make sure that the peak inductor current is below the current-limit 2.5A. Calculating the peak inductor current by the following equation: IPEAK = IIN + 0.5 x IL
R1 =
I
LED (max)
where: ILED(max) is the maximum LED current ILED(min) is the minimum LED current VADJ(high) is the maximum PWM voltage level VADJ(min) is the minimum PWM voltage level VFB is the FB pin Voltage
IPEAK =
where
VOUT x ILOAD ( VOUT - VIN) x VIN + VIN x 2 x L x FSW x VOUT
is the efficiency
Schottky Diode Selection
APW7128 1 R2 VADJ(max) PWM Voltage VADJ(min) R3 R1
FB
A fast recovery time and low forward voltage Schottky diode is necessary for optimum efficiency. Ensure that the diode' average and peak current rating exceed the avers age output current and peak inductor current. In addition, the diode' reverse voltage must exceed output voltage. s
R4 C4
Figure 3. Dimming with the PWM Voltage
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APW7128
Application Information (Cont.)
Capacitor Selection An input capacitor is required to supply the ripple current to the inductor and stabilize the input voltage. Larger input capacitor values and lower ESR provide smaller input voltage ripple and noise. The typical value for input capacitor is 2.2F to 10F. The output capacitor with typical value 1F to 10F is required to maintain the output voltage. The COMP capacitor with typical value 0.22F to 1F stabilizes the converter and controls the soft-start. To ensure the voltage rating of input and output capacitors is greater than the maximum input and output voltage. It is recommended using the ceramic capacitors with X5R, X7R, or better dielectrics for stable operation over the entire operating temperature range. Layout Consideration The correct PCB layout is important for all switching converters. If the layout is not carefully done, the regulator could show stability problems as well as EMI problems. Figure. 4 illustrates the layout guidelines; the bold lines indicate these traces that must be short and wide. The capacitors, the diode, and the inductor should be as close to the IC as possible. Keep traces short, direct, and wide. Keep the LX node away from FB and COMP pins. The trace from diode to the LEDs may be longer. The ground return of input capacitor and output capacitor should be tied close to PGND. Use the different ground planes for signal ground and power ground to minimize the effects of ground noise. Connect these ground nodes at any place close to one of the ground pins of the IC. The resistor from FB to GND should be close to the FB pin as possible. The metal plate of the bottom must be soldered to the PCB and connected to LX node and the LX plane on the backside through several thermal vias to improve heat dissipation.
VIN C1 VIN COMP C3 FB BP C2 BOTTOM SIDE PAD GN PGN D D R2 LX L1 D1 C4
Via connection to PGND plane Via connection to GND plane Via connection to LX plane Short and wide wires Short wires
Figure 4. Layouy Guidelines
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APW7128
Package Information
DFN3x3-10
D A
E
D2
e
S Y M B O L A A1 A3 b D D2 E E2 e L
DFN3*3-10 MILLIMETERS MIN. 0.80 0.00 0.20 REF 0.18 3.00 BSC 2.20 3.00 BSC 1.40 0.50 BSC 0.30 0.50 0.012 1.75 0.055 0.016 BSC 0.020 2.70 0.087 0.118 BSC 0.069 0.30 0.007 0.118 BSC 0.106 MAX. 1.00 0.05 MIN. 0.031 0.000 0.008 REF 0.012 INCHES MAX. 0.039 0.002
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L
E2
Pin 1 Corner
b A1 A3
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APW7128
Carrier Tape & Reel Dimensions
OD0 P0 P2 P1 A E1 F K0 B SECTION A-A T B0 A0 OD1 B A SECTION B-B
d
Application
A
H
H A
T1
T1
C
d
D
W
W
E1
F 5.5O .05 0 K0
178.0O .00 50 MIN. 2 DFN3x3-10 P0 4.0O .10 0 P1 8.0O .10 0
12.4+2.00 13.0+0.50 1.5 MIN. -0.00 -0.20 P2 2.0O .10 0 D0 1.5+0.10 -0.00 D1 1.5 MIN.
20.2 MIN. 12.0O .30 1.75O .10 0 0 T A0 B0
0.6+0.00 0 0 0 -0.40 3.35O .20 3.35O .20 1.30O .20 (mm)
Devices Per Unit
Package Type DFN3X3-10 Unit Tape & Reel Quantity 3000
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APW7128
Reflow Condition (IR/Convection or VPR Reflow)
TP tp Critical Zone TL to TP Ramp-up
TL
Temperature
tL Tsmax
Tsmin Ramp-down ts Preheat
25
t 25C to Peak
Time
Classification Reflow Profiles
Profile Feature Average ramp-up rate (TL to TP) Preheat - Temperature Min (Tsmin) - Temperature Max (Tsmax) - Time (min to max) (ts) Time maintained above: - Temperature (TL) - Time (tL) Peak/Classification Temperature (Tp) Time within 5C of actual Peak Temperature (tp) Ramp-down Rate Time 25C to Peak Temperature Sn-Pb Eutectic Assembly 3C/second max. 100C 150C 60-120 seconds 183C 60-150 seconds See table 1 10-30 seconds 6C/second max. 6 minutes max. Pb-Free Assembly 3C/second max. 150C 200C 60-180 seconds 217C 60-150 seconds See table 2 20-40 seconds 6C/second max. 8 minutes max.
Notes: All temperatures refer to topside of the package. Measured on the body surface.
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APW7128
Classification Reflow Profiles (Cont.)
Table 1. SnPb Entectic Process - Package Peak Reflow Temperatures Package Thickness <2.5 mm 2.5 mm Volume mm <350 240 +0/-5C 225 +0/-5C
3
Volume mm 350 225 +0/-5C 225 +0/-5C
3
Table 2. Pb-free Process - Package Classification Reflow Temperatures Volume mm Volume mm Volume mm <350 350-2000 >2000 <1.6 mm 260 +0C* 260 +0C* 260 +0C* 1.6 mm - 2.5 mm 260 +0C* 250 +0C* 245 +0C* 2.5 mm 250 +0C* 245 +0C* 245 +0C* * Tolerance: The device manufacturer/supplier shall assure process compatibility up to and including the stated classification temperature (this means Peak reflow temperature +0C. For example 260C+0C) at the rated MSL level. Package Thickness
3 3 3
Reliability Test Program
Test item SOLDERABILITY HOLT PCT TST ESD Latch-Up Method MIL-STD-883D-2003 MIL-STD-883D-1005.7 JESD-22-B,A102 MIL-STD-883D-1011.9 MIL-STD-883D-3015.7 JESD 78 Description 245C, 5 SEC 1000 Hrs Bias @125C 168 Hrs, 100%RH, 121C -65C~150C, 200 Cycles VHBM > 2KV, VMM > 200V 10ms, 1tr > 100mA
Customer Service
Anpec Electronics Corp. Head Office : No.6, Dusing 1st Road, SBIP, Hsin-Chu, Taiwan, R.O.C. Tel : 886-3-5642000 Fax : 886-3-5642050 Taipei Branch : 2F, No. 11, Lane 218, Sec 2 Jhongsing Rd., Sindian City, Taipei County 23146, Taiwan Tel : 886-2-2910-3838 Fax : 886-2-2917-3838
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