AME AME5268

AME
3A, 28V, 340KHz Synchronous
Rectified Step-Down Converter
AME5268
n General Description
n Features
The AME5268 is a fixed frequency monolithic synchronous buck regulator that accepts input voltage from 4.75V
to 28V. Two NMOS switches with low on-resistance are
integrated on the die. Current mode topology is used for
fast transient response and good loop stability.
l 3A Output Current
Shutdown mode reduces the input supply current to less
than 1µA. An adjustable soft-start prevents inrush current
at turn-on.
l Up to 95% Efficiency
l Wide 4.75V to 28V Operating Input Range
l Integrated Power MOSFET Switches
l Output Adjustable from 0.925V to 25V
l Programmable Soft Start
l Stable with Low ESR Ceramic Output
This device is available in SOP-8/PP package with exposed pad for low thermal resistance.
Capacitors
l Cycle-by Cycle Over Current Protection
l Fixed 340KHz Frequency
n Applications
l Input Under Voltage Lockout
l System Protected by Over-current Limiting,
l Distributed Power System
Over-voltage Protection and Thermal Shut-
l Networking System
down
l FPGA, DSP, ASIC Power Supplies
l Thermally Enhanced SOP-8/PP Package
l Notebook Computers
l All AME’ s Lead Free Products Meet RoHS
Standards
C
ie
n Typical Application
C5
10nF
VIN
12V
C1
10µF/35V
x2
R4
100KΩ
L1
15µH/3.4A
BS
IN
EN
VOUT
5V
3A
SW
AME5268
SS
GND
C4
0.1µF
Rev.B.01
FB
S
COMP
C3
3.3nF
R3
6.98KΩ1%
R1
44.2K Ω1%
R2
10KΩ1%
C2
22µF/10V
x2
1
AME
3A, 28V, 340KHz Synchronous
Rectified Step-Down Converter
AME5268
n Function Block Diagram
1.1V
OVDET
OVP
CURRENT SENSE AMP
FB
0.3V
VIN
SLOPE
5V
osc
CLK
BS
S Q
MH
COMP
6uA
PWM
LOGIC
R
SW
0.925V
EA
CLAMP
ML
SS
OVP
OTP
UVP
OTDET
UVLO
IRCMP
GND
EN
IN
2.5V
1.5V
INTERNAL
REGULATORS
LOCKOUT CMP
SHUTDOWN CMP
2
Rev.B.01
AME
3A, 28V, 340KHz Synchronous
Rectified Step-Down Converter
AME5268
n Pin Configuration
SOP-8/PP
Top View
8
7
6
5
AME5268-AZA
1. BS
2. IN
3. SW
AME5268
4. GND
5. FB
6. COMP
1
2
3
4
7. EN
Die Attach:
8. SS
Conductive Epoxy
Note:
The area enclosed by dashed line represents Exposed Pad and connect to GND.
C
ie
Rev.B.01
3
AME
3A, 28V, 340KHz Synchronous
Rectified Step-Down Converter
AME5268
n Pin Description
Pin Number
Pin Name
Pin Description
1
BS
High-Side Gate Drive Boost Input. BS supplies the drive for the high-side NChannel MOSFET switch. Connect a 10nF or greater capacitor from SW to
BS to power the high side switch.
2
IN
Power Input. IN supplies the power to the IC, as well as the step-down
converter switches. Drive IN with a 4.75V to 28V power source. Bypass IN to
GND with a suitable large capacitor to eliminate noise on the input to the IC.
3
SW
Power Switching Output. SW is the switching node that supplies power to the
output. Connect the output LC filter from SW to the output load. Note that a
capacitor is required from SW to BS to power the high-side switch.
4
GND
Ground. Connect the exposed pad to pin 4.
5
FB
Feedback Input. FB senses the output voltage to regulate that voltage. Drive
FB with a resistive voltage divider from the output voltage. The feedback
reference voltage is 0.925V.
6
COMP
Compensation Node. COMP is used to compensate the regulation control
loop. Connect a series RC network from COMP to GND to compensate the
regulation control loop. In some cases, an additional capacitor from COMP to
GND is required.
7
EN
Enable Input. EN is a digital input that turns the regulator on or off. Drive EN
higher than 2.7V to turn on the regulator, drive it lower than 1.1V to turn it off.
Pull up to the IN pin with 100KΩ resister for automatic start up.
SS
Soft-start Control Input. SS controls the soft-start period. Connect a capacitor
from SS to GND to set the soft-start period. Add a 0.1µF capacitor set the
soft-start period to 15mS. To disable the soft start feature, leave the SS
unconnected.
8
4
Rev.B.01
AME
3A, 28V, 340KHz Synchronous
Rectified Step-Down Converter
AME5268
n Ordering Information
AME5268 - x x x xxx
Output Voltage
Number of Pins
Package Type
Pin Configuration
Pin Configuration
A
(SOP-8/PP)
1. BS
2. IN
3. SW
4. GND
5. FB
6. COMP
7. EN
8. SS
Package
Type
Z: SOP/PP
Number of
Pins
A: 8
Output Voltage
ADJ: Adjustable
C
ie
Rev.B.01
5
AME
3A, 28V, 340KHz Synchronous
Rectified Step-Down Converter
AME5268
n Available Options
Part Number
Marking
Output
Voltage
Package
Operating Ambient
Temperature Range
AME5268-AZAADJ
A5268
AMyMXX
ADJ
SOP-8/PP
-40OC to +85OC
Note:
1. The first 2 places represent product code. It is assigned by AME such as AM.
2. y is year code and is the last number of a year. Such as the year code of 2008 is 8.
3. A bar on top of first letter represents Green Part such as A5268.
4. The last 3 places MXX represent Marking Code. It contains M as date code in "month", XX as LN code and
that is for AME internal use only. Please refer to date code rule section for detail information.
5. Please consult AME sales office or authorized Rep./Distributor for the availability of output voltage and package
type.
6
Rev.B.01
AME
3A, 28V, 340KHz Synchronous
Rectified Step-Down Converter
AME5268
n Absolute Maximum Ratings
Parameter
Maximum
Unit
Supply Voltage
-0.3V to +30V
V
Switch Voltage
-1V to VIN +0.3
V
-0.3V to VSW + 6
V
All Other Pins
-0.3V to +6
V
EN Voltage
-0.3V to VIN
V
Boost Switch Voltage
B*
ESD Classification
Caution: Stress above the listed absolute maximum rating may cause permanent damage to the device.
HBM B: 2000V ~ 3999V
n Recommended Operating Conditions
Parameter
Rating
Unit
Ambient Temperature Range
-40 to +85
o
C
Junction Temperature Range
-40 to +125
o
C
-65 to +150
o
C
Storage Temperature Range
C
ie
Rev.B.01
7
AME
3A, 28V, 340KHz Synchronous
Rectified Step-Down Converter
AME5268
n Thermal Information
Parameter
Package
Thermal Resistance*
(Junction to Case)
SOP-8/PP
Die Attach
Symbol
Maximum
θJC
19
Unit
o
Thermal Resistance
(Junction to Ambient)
SOP-8/PP
Internal Power Dissipation
SOP-8/PP
Maximum Junction Temperature
Conductive Epoxy
θJA
84
PD
1450
C/W
mW
150
o
Solder Iron(10 Sec)**
C
350
* Measure θJC on backside center of Exposed Pad.
** MIL-STD-202G 210F
8
Rev.B.01
AME
3A, 28V, 340KHz Synchronous
Rectified Step-Down Converter
AME5268
n Electrical Specifications
VIN = 12V, TA = 25OC, unless otherwise noted.
Parameter
Shutdown Current
Symbol
Test Condition
ISHDN
Supply Current
Feedback Voltage
VFB
Typ
Max
Units
VEN = 0V
1
3.0
µA
VEN = 3V, VFB = 1.2V
1.3
1.5
mA
0.925
0.95
V
4.75V <= VIN <=28V
Min
0.90
OVP Threshold Voltage
1.10
V
400
V/V
800
µA/V
Error Amplifier Voltage Gain
AEA
Error Amplifier Transconductance
GEA
High-side Switch On Resistance
RDS,ON,HI
135
mΩ
Low-side Switch On Resistance
RDS,ON,LO
105
mΩ
Switch Leakage Current
ISW,LK
∆IC = ±10µA
High-side Switch Current Limit
Minimum Duty Cycle
Low-side Switch Current Limit
From Drain to Source
COMP to Current Sense
Transconductance
fOSC,CL
Short Circuit Oscillation Frequency
fOSC,SCR
DMAX
Minimum On Time
t ON,MIN
Input Undervoltage Lockout
VUVLO
TA = 25OC
300
-40OC<=TA <=+85OC
C
VFB = 0V
270
VFB =0.8V
ie
VIN rising, TA = 25OC
O
O
-40 C<=TA <=+85 C
Input Undervoltage Lockout
Hysteresis
4
GCS
Current Limit Oscillation Frequency
Maximum Duty Cycle
10
VEN = 0V, VSW = 0V
3.8
5.8
A
1.25
A
5.2
A/V
340
380
KHz
400
KHz
116
KHz
90
%
220
nS
4.05
3.5
VUVLO,HYST
µA
4.3
V
4.7
V
210
mV
Soft-Start Current Source
ISS
VSS = 0V
6
µA
Soft-Start Period
t SS
CSS = 0.1µF
15
mS
EN Lockout Threshold Voltage
Rev.B.01
VEN
TA = 25OC
2.2
-40OC<=TA <=+85OC
2.2
2.5
2.7
V
2.7
V
9
AME
3A, 28V, 340KHz Synchronous
Rectified Step-Down Converter
AME5268
n Electrical Specifications (Contd.)
VIN = 12V, TA = 25OC, unless otherwise noted.
Parameter
Symbol
EN Shutdown Threshold Voltage
10
Test Condition
Min
Typ
Max
Units
VEN Rising
1.1
1.56
2
V
EN Shutdown Threshold Voltage
Hysteresis
210
mV
EN Lockout Hysteresis
210
mV
Thermal Shutdown Temperature
OTP
Shutdown, temperature increasing
160
O
C
Thermal Shutdown Hysteresis
OTH
Restore, temperature decreasing
20
O
C
Rev.B.01
AME
AME5268
n Detailed Description
Oscillator Frequency
The internal free running oscillator sets the PWM frequency at 340KHz.
Enable and Soft start
The EN Pin provides electrical on/off control of the regulator. Once the EN pin voltage exceeds the lockout threshold voltage, the regulator starts operation and the soft start
begins to ramp. If the EN pin voltage is pulled below the
lockout threshold voltage, the regulator stops switching
and the soft start resets. Connecting the pin to ground or
to any voltage less than 0.5V will disable the regulator and
activate the shutdown mode. To limit the start-up inrush
current, a soft-start circuit is used to ramp up the reference voltage from 0V to its final value, linearly. The softstart time is 15 ms typically.
3A, 28V, 340KHz Synchronous
Rectified Step-Down Converter
Over-voltage Protection
The AME5268 has an over-voltage protection (OVP) circuit to minimize voltage overshoot when recovering from
output fault conditions. The OVP circuit include an overvoltage comparator to compare the FB pin voltage and a
threshold of 120% x V FB. Once the FB pin voltage is higher
than the threshold, the COMP pin and the SS pin are discharged to GND, forcing the high-side MOSFET off. When
the FB pin voltage drops lower than the threshold, the highside MOSFET will be enabled again.
Thermal Shutdown
The AME5268 protects itself from overheating with an
internal thermal shutdown circuit. If the junction temperature exceeds the thermal shutdown trip point, the voltage
reference is grounded and the high-side MOSFET is turned
off. The part is restarted under control of the soft start
circuit automatically when the junction temperature drops
30OC below the thermal shutdown trip point.
Under Voltage Lockout (UVLO)
Component Selection
The AME5268 incorporates an under voltage lockout circuit to keep the device disabled when VIN (the input voltage) is below the UVLO start threshold voltage. During
Setting the Output Voltage
power up, internal circuits are held inactive and the soft
start is grounded until V IN exceeds the UVLO start threshThe output voltage is using a resistive voltage divider conold voltage. Once the UVLO start threshold voltage is C nected from the output voltage to FB. It divides the output
reached, the soft start is released and device start-up bevoltage down to the feedback voltage by the ratio:
gins. The device operates until VIN falls below the UVLO
stop threshold voltage. The typical hysteresis in the UVLO i e
R2
comparator is 210mV.
VFB = VOUT
R1 + R2
Over-Current Protection
Overcurrent limiting is implemented by monitoring the
current through the high side MOSFET. If this current exceeds the over-current threshold limit, the overcurrent indicator is set true. The system will ignore the over-current
indicator for the leading edge blanking time at the beginning of each cycle to avoid any turn-on noise glitches.
the output voltage is:
VOUT = 0.925 ×
R1 + R 2
R2
Once overcurrent indicator is set true. The high-side
MOSFET is turned off for the rest of the cycle after a propagation delay. This over-current limiting mode is called
cycle-by-cycle current limiting.
Rev.B.01
11
AME
AME5268
3A, 28V, 340KHz Synchronous
Rectified Step-Down Converter
n Detailed Description (Contd.)
Inductor
The inductor is required to supply constant current to
the load while being driven by the switched input voltage.
A larger value inductor will have a larger physical size,
higher series resistance, and lower saturation current. It
will result in less ripple current that will in turn result in
lower output ripple voltage. Make sure that the peak inductor current is below the maximum switch current limit.
Determine inductance is to allow the peak-to peak ripple
current to be approximately 30% of the maximum switch
current limit. The inductance value can be calculated by:
L=
VOUT  VOUT 
× 1 −

fs × ∆IL 
VIN 
Where fs is the switching frequency, VIN is the input
voltage, VOUT is the output voltage, and ∆IL is the peak-topeak inductor ripple current. Choose an inductor that will
not saturate under the maximum inductor peak current,
calculated by:
ILP = ILOAD +
VOUT
 VOUT 
× 1 −

2 × fs × L 
VIN 
Where ILOAD is the load current. The choice of which style
inductor to use mainly depends on the price vs. size requirements and any EMI constraints.
Input Capacitor
The input current to the step-down converter is discontinuous, therefore a capacitor is required to supply the AC
current while maintaining the DC input voltage. Use low
ESR capacitors for the best performance. Ceramic capacitors are preferred, but tantalum or low-ESR electrolytic
capacitors will also be suggested. Choose X5R or X7R
dielectrics when using ceramic capacitors.
Since the input capacitor (C1) absorbs the input switching
current, it requires an adequate ripple current rating. The
RMS current in the input capacitor can be estimated by:
VOUT  VOUT 
IC 1 = I LOAD ×
× 1 −

VIN 
VIN 
12
At VIN = 2V OUT, where IC1 = ILOAD /2 is the worst-case
condition occurs. For simplification, use an input capacitor with a RMS current rating greater than half of the maximum load current. When using ceramic capacitors, make
sure that they have enough capacitance to provide sufficient charge to prevent excessive voltage ripple at input.
When using electrolytic or tantalum capacitors, a high
quality, small ceramic capacitor, i.e. 0.1µF, should be placed
as close to the IC as possible. The input voltage ripple for
low ESR capacitors can be estimated by:
∆VIN =
I LOAD VOUT  VOUT 
×
× 1 −

C1× fs VIN 
VIN 
Where C1 is the input capacitance value.
Output Capacitor
The output capacitor (C2) is required to maintain the DC
output voltage. Ceramic, tantalum, or low ESR electrolytic
capacitors are recommended. Low ESR capacitors are
preferred to keep the output voltage ripple low. The output
voltage ripple can be estimated by:
∆VOUT =

VOUT  VOUT  
1
× 1 −

 ×  RESR +
fs × L 
VIN  
8 × fs × C 2 
Where RESR is the equivalent series resistance (ESR)
value of the output capacitor and C2 is the output capacitance value.
When using ceramic capacitors, the impedance at the
switching frequency is dominated by the capacitance which
is the main cause for the output voltage ripple. For simplification, the output voltage ripple can be estimated by:
∆VOUT =
VOUT
 VOUT 
× 1 −

2
8 × fs × L × C 2 
VIN 
When using tantalum or electrolytic capacitors, the ESR
dominates the impedance at the switching frequency. For
simplification, the output ripple can be approximated to:
∆VOUT =
VOUT  VOUT 
× 1 −
 × RESR
fs × L 
VIN 
The characteristics of the output capacitor also affect the
stability of the regulation system. The AME5268 can be
optimized for a wide range of capacitance and ESR values.
Rev.B.01
AME
3A, 28V, 340KHz Synchronous
Rectified Step-Down Converter
AME5268
n Detailed Description (Contd.)
Compensation Components
AME5268 has current mode control for easy compensation and fast transient response. The system stability and
transient response are controlled through the COMP pin.
COMP is the output of the internal transconductance error
amplifier. A series capacitor-resistor combination sets a
pole-zero combination to govern the characteristics of the
control system. The DC gain of the voltage feedback loop
is given by:
AVDC = RLOAD × GCS × AEA ×
VFB
VOUT
Where VFB is the feedback voltage (0.925V), A VEA is the
error amplifier voltage gain, GCS is the current sense
transconductance and RLOAD is the load resistor value. The
system has two poles of importance. One is due to the
output capacitor and the load resistor, and the other is due
to the compensation capacitor (C3) and the output resistor
of the error amplifier. These poles are located at:
f P1 =
GEA
2π × C3 × AVEA
fP 2 =
1
2π × C 2 × RLOAD
C
Where GEA is the error amplifier transconductance.
The system has one zero of importance, due to the compensation capacitor (C3) and the compensation resistor
ie
(R3). This zero is located at:
fZ 1 =
1
2π × C 3 × R 3
The system may have another zero of importance, if the
output capacitor has a large capacitance and/or a high ESR
value. The zero, due to the ESR and capacitance of the
output capacitor, is located at:
f ESR =
Rev.B.01
1
2π × C 2 × RESR
In this case, a third pole set by the compensation capacitor (C6) and the compensation resistor (R3) is used
to compensate the effect of the ESR zero on the loop
gain. This pole is located at:
f P3 =
1
2π × C 6 × R 3
The goal of compensation design is to shape the converter transfer function to get a desired loop gain. The
system crossover frequency where the feedback loop has
the unity gain is important. Lower crossover frequencies
result in slower line and load transient responses, while
higher crossover frequencies could cause system instability. A good standard is to set the crossover frequency
below one-tenth of the switching frequency. To optimize
the compensation components, the following procedure
can be used.
1. Choose the compensation resistor (R3) to set
the desired crossover frequency.
Determine R3 by the following equation:
R3 =
2π × C 2 × fC VOUT 2π × C 2 × 0.1× fs VOUT
×
<
×
GEA × GCS
VFB
GEA × GCS
VFB
Where fC is the desired crossover frequency which is
typically below one tenth of the switching frequency.
2. Choose the compensation capacitor (C3) to achieve
the desired phase margin. For applications with typical
inductor values, setting the compensation zero (fZ1) below one-forth of the crossover frequency provides sufficient phase margin.
Determine C3 by the following equation:
C3 >
4
2π × R3 × f C
Where R3 is the compensation resistor.
13
AME
AME5268
3A, 28V, 340KHz Synchronous
Rectified Step-Down Converter
n Detailed Description (Contd.)
3. Determine if the second compensation capacitor (C6) is
required. It is required if the ESR zero of the output capacitor is located at less than half of the switching frequency, or
the following relationship is valid:
1
fS
<
2π × C 2 × RESR 2
If this is the case, then add the second compensation capacitor (C6) to set the pole fP3 at the location of the ESR
zero. Determine C6 by the equation:
C6 =
14
C 2 × RESR
R3
Rev.B.01
AME
3A, 28V, 340KHz Synchronous
Rectified Step-Down Converter
AME5268
n Characterization Curve(For reference only)
Efficiency vs. Output Current
Efficiency vs. Output Current
90
80
80
70
70
Efficiency(%)
100
90
Efficiency(%)
100
60
50
VOUT = 3.3V
VIN = 12V
C IN = 20µF
C OUT = 44µF
L = 10µH
40
30
20
10
60
50
40
20
10
0
0
100
1000
VOUT = 5V
VI N = 12V
CI N = 20µF
COUT = 44µ F
L = 15µH
30
10000
100
1000
Output Current(mA)
Output Current(mA)
Frequency vs. Temperature
Start-Up form EN
10000
400
390
380
Frequency(KHz)
370
1
360
350
340
330
2
320
310
C
300
3
290
280
VIN = 12V
270
260
-50
ie
-25
0
+25
+50
+75
+100
4
+125
4mS / div
Temperature (oC)
VIN = 12V
VOUT = 5V
IOUT = 3000mA
C = 0.1µF
SS
1) EN = 5V/div
2) VOUT = 2V/div
3) IL = 2A/div
4) IOUT = 2A/div
Rev.B.01
15
AME
3A, 28V, 340KHz Synchronous
Rectified Step-Down Converter
AME5268
n Characterization Curve(For reference only)
Power Off from EN
Load Step
1
1
2
2
3
3
4
4
VIN = 12V
VOUT = 5V
IOUT = 3000mA
C = 0.1µF
200µS / div
VIN = 12V
VOUT = 3.3V
IOUT = 0mA to 3000mA
O
C = 470pF, T =25 C
400µS / div
SS
SS
1) EN = 5V/div
2) VOUT = 5V/div
3) IL = 2A/div
4) IOUT = 2A/div
A
1) VCOMP = 1V/div
2) VOUT = 500mV/div
3) IL = 2A/div
4) IOUT = 2A/div
Load Step
Load Step
1
1
2
2
3
3
4
4
200µS / div
VIN = 12V
VOUT = 5V
IOUT = 0mA to 3000mA
O
C = 470pF, T =25 C
SS
A
1) VCOMP = 1V/div
2) VOUT = 500mV/div
3) IL = 2A/div
4) IOUT = 2A/div
16
200µS / div
VIN = 12V
VOUT = 3.3V
IOUT = 500mA to 3000mA
O
C = 470pF, T =25 C
SS
A
1) VCOMP = 1V/div
2) VOUT = 500mV/div
3) IL = 2A/div
4) IOUT = 2A/div
Rev.B.01
AME
3A, 28V, 340KHz Synchronous
Rectified Step-Down Converter
AME5268
n Characterization Curve(For reference only)
Load Step
Stead State Test
1
1
2
2
3
3
4
4
200µS / div
2µS / div
VIN = 12V
VOUT = 5V
IOUT = 500mA to 3000mA
O
C = 470pF, T =25 C
SS
VIN = 12V
VOUT = 5V
IOUT = 0mA
C = 470pF
A
SS
1) VCOMP = 1V/div
2) VOUT = 500mV/div
3) IL = 2A/div
4) IOUT = 2A/div
1) VIN = 50V/div
2) VCOMP = 20mV/div
3) IL = 500mA/div
4) IOUT = 500mA/div
C
ie
Rev.B.01
17
AME
3A, 28V, 340KHz Synchronous
Rectified Step-Down Converter
AME5268
n Date Code Rule
Month Code
1: January 7: July
2: February 8: August
3: March
9: September
4: April
A: October
5: May
B: November
6: June
C: December
n Tape and Reel Dimension
SOP-8/PP
P
PIN 1
W
AME
AME
Carrier Tape, Number of Components Per Reel and Reel Size
18
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
SOP-8/PP
12.0±0.1 mm
4.0±0.1 mm
2500pcs
330±1 mm
Rev.B.01
AME
3A, 28V, 340KHz Synchronous
Rectified Step-Down Converter
AME5268
n Package Dimension
SOP-8/PP
TOP VIEW
SIDE VIEW
D1
0'
E1
E2
E
L1
C
1
D
FRONT VIEW
A1
e
A
A2
b
CSYMBOLS
ie
INCHES
MIN
MAX
MIN
MAX
A
1.350
1.750
0.053
0.069
A1
0
0.150
0
0.006
A2
1.350
1.600
0.053
0.063
C
0.100
0.250
0.004
0.010
E
3.750
4.150
0.148
0.163
E1
5.700
6.300
0.224
0.248
L1
0.300
1.270
0.012
0.05
b
0.310
0.510
0.012
0.020
D
4.700
5.120
0.185
0.202
e
Rev.B.01
MILLIMETERS
1.270 BSC
0.05 BSC
θ'
0
E2
2.150
2.513
0.085
0.099
D1
2.150
3.402
0.085
0.134
o
8
o
0
o
8
o
19
www.ame.com.tw
E-Mail: [email protected]
Life Support Policy:
These products of AME, Inc. are not authorized for use as critical components in life-support
devices or systems, without the express written approval of the president
of AME, Inc.
AME, Inc. reserves the right to make changes in the circuitry and specifications of its devices and
advises its customers to obtain the latest version of relevant information.
 AME, Inc. , July 2010
Document: 3003-DS5268-B.01
Corporate Headquarter
AME, Inc.
2F, 302 Rui-Guang Road, Nei-Hu District
Taipei 114, Taiwan.
Tel: 886 2 2627-8687
Fax: 886 2 2659-2989