Anpec APW7209C Schematic [ru]

APW7209
1MHz, High-Efficiency, Step-Up Converter for 2 to 10 White LEDs
Features
Wide Input Voltage from 2.5V to 6V
0.3V Reference Voltage
Fixed 1MHz Switching Frequency
High Efficiency up to 88%
100Hz to 200kHz PWM Brightness Control
Frequency
Open-LED Protection
Under-Voltage Lockout Protection
Over-Temperature Protection
<1µA Quiescent Current during Shutdown
SOT-23-6 and TSOT-23-6A Package
Lead Free and Green Devices Available
(RoHS Compliant)
Applications
White LED Display Backlighting
Cell Phone and Smart Phone
General Description
The APW7209 is a current-mode and fixed frequency boost converter with an integrated N-FET to drive up to 10 white LEDs in series. The series connection allows the LED current to be iden­tical for uniform brightness. Its low on-resistance of N­FET and low feedback voltage reduce power loss and achieve high effic iency. Fast switching frequency(1MHz typical) allows us ing small-size inductor and both of in­put and output capacitors. An over-voltage protec tion function, which monitors the output voltage via OVP pin, stops switching of the IC if the OVP voltage exceeds the over voltage threshold. An internal soft-start circuit elimi­nates the inrush c urrent during start-up. The APW7209 also integrates under-voltage lockout, over­temperature protection, and c urrent limit circuits to pro­tect the IC in abnormal conditions.The APW7209 is avail­able in a SOT-23-6 and TSOT-23-6 package.
Simplified Application Circuit
PDA, PMP, MP3
Digital Camera
Pin Configuration
LX 1
GND 2
FB 3
SOT-23-6/TSOT-23-6
(Top View )
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.
6 VIN 5 OVP 4 EN
V
IN
C1
4.7µF
OFF ON
22µH
6
VIN
2
GND
APW7209
4
EN
L1
LX
OVP
FB
V
OUT
1
5
3
C2
1µF
Up to 10 WLEDs
R1 15
Copyright ANPEC Electronics Corp. Rev. A.8 - Sep., 2013
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APW7209
Ordering and Marking Information
APW7209
Assembly Material
Handling Code Temperature Range Package Code
APW7209 C: X - Date Code
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-020D 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).
W09X
Package Code C : SOT-23-6 CT : TSOT-23-6A Operating Ambient Temperature Range I : -40 to 85 oC Handling Code TR : Tape & Reel Assembly Material G : Halogen and Lead Free Device
APW7209 CT: X - Date Code
W09X
Absolute Maximum Ratings (Note 1)
Symbol
VIN VIN Supply Voltage (VIN to GND) -0.3 ~ 7 V
FB, EN to GND Voltage -0.3 ~ VIN V
VLX LX to GND Voltage -0.3 ~ 42 V
V
OVP to GND Voltage -0.3 ~ 42 V
OVP
TJ Maximum Junction Temperature 150 °C
T
Storage Temperature -65 ~ 150 °C
STG
T
Maximum Lead Soldering Temperature, 10 Seconds 260 °C
SDR
Note1: Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under "recom­mended operating conditions" is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Parameter Rating Unit
Thermal Characteristics (Note 2)
Symbol
Junction to Ambient Thermal Resistance.
θJA
Note 2: θJA is measured with the component mounted on a high effective thermal conductivity test board in free air.
Recommended Operating Conditions (Note 3)
Parameter Typical Value Unit
SOT-23-6 TSOT-23-6A
250 220
°C/W
Symbol
VIN VIN Input Voltage 2.5~ 6 V
V
Converter Output Voltage Up to 37 V
OUT
CIN Input Capacitor 4.7 or higher
C
Output capacitor 0.68 or higher
OUT
L1 Inductor 6.8 ~ 47 TA Ambient Temperature -40 ~ 85 °C
TJ Junction Temperature -40 ~ 125 °C
Note 3: Refer to the application circuit for further information.
Copyright ANPEC Electronics Corp. Rev. A.8 - Sep., 2013
Parameter Range Unit
µF µF µH
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APW7209
Electrical Characteristics
(Refer to figure 1 in the “Typical Application Circuits”. These specifications apply over VIN = 3.6V, TA = -40°C to 85°C, unless otherwise noted. Typical values are at TA = 25°C.)
Symbol
Parameter Test Conditions
APW7209
Min. Typ. Max.
SUPPLY VOLTAGE AND CURRENT
VIN Input Voltage Range TA = -40 ~ 85°C, TJ = -40 ~ 125°C 2.5 - 6 V
I
V
DD1
I
Input DC bias current
FB = GND, switching - 1 2 mA
DD2
ISD
= 0.4V, no switching 70 100 130 µA
FB
EN = GND - - 1 µA
UNDER VOLTAGE LOCKOUT
UVLO Threshold Voltage VIN Rising 2.0 2.2 2.4 V UVLO Hysteresis Voltage 50 100 150 mV
REFERENCE AND OUTPUT VOLTAGES
V
Regulated Feedback Voltage
REF
TA = 25°C 0.285 TA = -40 ~ 85°C (TJ = -40 ~ 125°C) 0.276
0.3 0.315
- 0.324
IFB FB Input Current -50 - 50 nA
INTERNAL POWER SWITCH
FSW Switching Frequency FB=GND 0.8 1.0 1.2 MHz RON Power Switch On Resistance - 0.6 -
I
Power Switch Current Limit 0.7 1.0 1.4 A
LIM
LX Leakage Current VEN=0V, VLX=0V or 5V, VIN = 5V -1 - 1 µA
D
LX Maximum Duty Cycle 92 95 98 %
MAX
OUTPUT OVER-VOLTAGE PROTECTION
V
Over Voltage Threshold V
OVP
rising 38 40 43 V
OVP
OVP Hysteresis - 3 - V OVP Leakage Current V
=40V - 50 - µA
OVP
ENABLE AND SHUTDOWN
V
EN Voltage Threshold VEN Rising 0.4 0.7 1 V
TEN
EN Voltage Hysteresis - 0.1 - V
I
EN Leakage Current VEN= 0~5V, VIN = 5V -1 - 1 µ A
LEN
OVER-TEMPERATURE PROTECTION
T
Over-Temperature Protection
OTP
Over-Temperature Protection Hysteresis
(Note 4)
(Note 4)
TJ Rising - 150 - °C
- 40 - °C
Note 4: Guaranteed by design, not production tested.
Unit
V
Copyright ANPEC Electronics Corp.
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Rev. A.8 - Sep., 2013
APW7209
Typical Operating Characteristics
(Refer to figure 1 in the section “Typical Application Circuits”, VIN=3.6V, TA=25oC, 10WLEDs unless otherwise specified)
Efficiency vs. WLED Current
95 90 85 80 75 70
Efficiency (η)
65 60
VIN=3.3V
55 50
0 5 10 15 20 25 30
VIN=3.6V
WLED Current, I
VIN=4.2V
10 WLEDs 33V@20mA
(mA)
LED
WLED Current vs. Supply Voltage
21.0
20.8
20.6
20.4
(mA)
LED
20.2
20.0
19.8
19.6
WLED Current, I
19.4
19.2
19.0
2.5 3 3.5 4 4.5 5 5.5 6
Supply Voltage, V
IN
Switching Frequency vs. Supply
1.2
1.1
(MHz)
1
SW
0.9
0.8
0.7
0.6
0.5
Switching Frequency, F
0.4
2.5 3 3.5 4 4.5 5 5.5 6
Copyright ANPEC Electronics Corp. Rev. A.8 - Sep., 2013
Voltage
Supply Voltage, V
IN
(V)
(V)
η=P
VIN=5V
OUT/PIN
WLED Current vs. PWM Duty Cycle
20 18 16 14
(mA)
LED
12 10
8 6
WLED Current, I
4 2 0
0 20 40 60 80 100
100Hz
1kHz
PWM Duty Cycle (%)
Maximum Duty Cycle vs. Supply
Voltage
100
90
(%)
MAX
80
70
60
50
Maximum Duty Cycle, D
40
2.5 3 3.5 4 4.5 5 5.5 6
Supply Voltage, V
IN
Switch ON Resistance vs. Supply
0.8
0.7
(Ω)
ON
0.6
0.5
0.4
0.3
0.2
0.1
Switch ON Resistance, R
0
2.5 3 3.5 4 4.5 5 5.5 6
Voltage
Supply Voltage, V
IN
100kHz
(V)
(V)
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APW7209
Operating Waveforms
(Refer to the application circuit in the section “Typical Application Circuits”, VIN=3.6V, TA=25oC, 10WLEDs unless otherwise specified )
1
2
3
CH1: VEN, 1V/Div, DC CH2: V
OUT
CH3: IIN, 0.2A/Div, DC Time: 0.5ms/Div
Start-up
V
EN
V
, 10V/Div
OUT
IIN, 0.2A/Div
10WLEDs, L=22µH, VIN=3.6V, I
, 10V/Div, DC
LED
=20mA
Normal Operating Waveform
1
2
3
CH1: VLX, 20V/Div, DC CH2: V
OUT
CH3: IL, 0.2A/Div, DC Time: 500ns/Div
VLX, 20V/Div, DC
V
, 100mV/Div, AC
OUT
IL, 0.2A/Div
10WLEDs, L=22µH, VIN=3.6V, I
, 100mV/Div, AC
LED
=20mA
Open-LED Protection
V
, 10V/Div
OUT
1
CH1: V Time: 20ms/Div
Copyright ANPEC Electronics Corp. Rev. A.8 - Sep., 2013
, 10V/Div, DC
OUT
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APW7209
Σ
Pin Description
PIN
NO. NAME
1 LX Switch pin. Connect this pin to inductor/diode here. 2 GND Power and signal ground pin.
3 FB
4 EN
5 OVP Over Voltage Protection Input Pin. OVP is connected to the output capacitor of the converter. 6 VIN Main Supply Pin. Must be closely decoupled to GND with a 4.7µ F or greater ceramic capacitor.
Feedback Pin. Reference voltage is 0.3V(typical). Connect this pin to cathode of the lowest LED and current-sense resistor (R1). Calculate resistor value according to R1=0.3V/I
Enable Control Input. Forcing this pin above 1.0V enables the device, or forcing this pin below 0.4V to shut it down. In shutdown, all functions are disabled to decrease the supply current below 1µA.
Do not leave this pin floating.
FUNCTION
Block Diagram
VIN
EN
UVLO
OVP
LED
.
GND
Over-
Temperature
Protection
Slope
Compensation
Oscillator
Soft-
start
Control Logic
Current
limit
ICMP
COMP
Gate Driver
Current Sense
Amplifier
Error
Amplifier
EAMP
V
REF
0.3V
LX
FB
Copyright ANPEC Electronics Corp. Rev. A.8 - Sep., 2013
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APW7209
Typical Application Circuits
V
IN
C1
4.7µF
OFF ON
V
IN
C1
4.7µF
100Hz~200kHz
Duty=100%, I
LED
Duty=0%, LED off
L1
22µH
6
VIN
2
GND
4
EN
APW7209
LX
OVP
FB
1
5
3
Figure 1. Typical 10 WLEDs Application
L1
22µH
=20mA
6
VIN
2
GND
4
EN
APW7209
LX
OVP
FB
1
5
3
C2 1µF
C2 1µF
V
Up to 10 WLEDs
R1 15
V
Up to 10 WLEDs
R1 15
OUT
OUT
Figure 2. Brightness control by using a PWM signal applied to EN
V
IN
L1
22µH
C1
4.7µF
1R
OFF ON
brightness
V2R
REF
=
PWM
control
=
1V
 
+
6
VIN
2
GND
APW7209
4
EN
3.3V
Duty=100%, LED off Duty=0%, I
2R
 
I
LED
V
3R2R3R
MAX,LED
=22mA
MIN,ADJREF
0V
LX
OVP
FB
1
5
C2 1µF
Up to 10 WLEDs
3
R2
R3
100K
V
ADJ
R4
10K
C3
0.1µF
V3RIV3RI
+
MAX,ADJMIN,LEDMIN,ADJMAX,LED
10K
IVIVIVIV
+
R1 15
MAX,LEDREFMIN,LEDMIN,ADJMIN,LEDREFMAX,LEDMAX,ADJ
Figure 3. Brightness control using a filtered PWM signal
V
OUT
Copyright ANPEC Electronics Corp. Rev. A.8 - Sep., 2013
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APW7209
Function Description
Main Control Loop
VIN Under-Voltage Lockout (UVLO)
Soft-Start
Current-Limit Protection
COMP
.
Over-Temperature Protection (OTP)
Enable/Shutdown
Open-LED Protection
Copyright ANPEC Electronics Corp. Rev. A.8 - Sep., 2013
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APW7209
(
)
Application Information
Input Capacitor Selection
The input c apacitor (CIN) reduces the ripple of the input current drawn from the input supply and reduces nois e injection into the IC. The reflected ripple voltage will be smaller when an input capacitor with larger capacitance is used. For reliable operation, it is recommended to select the capacitor with maximum voltage rating at least
Inductor Selection
Selecting an inductor with low dc resistance reduces con­duction losses and achieves high efficiency. The efficiency is moderated whilst using small chip inductor which op­erates with higher inductor core los ses. Therefore, it is necessary to take further consideration while choos ing an adequate inductor. Mainly, the inductor value deter­mines the inductor ripple current: larger inductor value results in s maller inductor ripple current and lower con­duction losses of the converter. However, larger inductor value generates slower load transient response. A rea­sonable design rule is to set the ripple current, ∆IL, to be 30% to 50% of the maximum average inductor current, I
. The inductor value can be obtained as below,
L(AVG)
2
V
IN
L
 
×
V
OUT
VV
INOUT
×
IF
η
×
)MAX(OUTSW
   
I
( )
I
L
 
AVGL
where
VIN = input voltage V
= output voltage
OUT
FSW = switching frequency in MHz I
= maximum output current in amp.
OUT
η = Efficiency ∆IL /I
= inductor ripple current/average current
L(AVG)
(0.3 to 0.5 typical) To avoid saturation of the inductor, the inductor should be
×
VI
=
I
)MAX(IN
OUT)MAX(OUT
η×
V
IN
VVV21
LX
INOUTIN
FLV
SWOUT
D1
I
SW
I
PEAK
I
V
OUT
OUT
ESR
C
OUT
I
LIM
I
L
I
IN
I
OUT
II
V
I
IN
IN
C
IN
I
L
I
SW
I
D
+=
)MAX(INPEAK
I
L
N-FET
Output Capacitor Selection
ΔV
where I
= ΔV
OUT
V
COUT
is the peak inductor current.
PEAK
C
I
OUT
OUT
ESR
RIV ×
+ ΔV
 
×
 
ESRPEAKESR
COUT
×
VV
INOUT
FV
SWOUT
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Rev. A.8 - Sep., 2013
APW7209
Recommended
Inductor
Selection
Application Information (Cont.)
Output Capacitor Selection (Cont.)
. When choosing the input and
COUT
Diode Selection
Setting the LED Current
), flowing via the LEDs and the R1, is calcu-
LED
lated by the following equation:
I
LED
V3.0
=
1R
Designator Manufacturer
L1 GOTREND L1 GOTREND
Part Number Inductance (µH) Max DCR (ohm)
GTSD-53-470 47 0.35 0.62 5 x 5 x 2.8 GTSD-32-220 22 0.59 0.52 3.85 x 3.85 x 1.8
Saturation
Current (A)
Recommended Capacitor Selection
Designator Manufacturer
C1 Murata GRM188R60J475KE19 C2 Murata GRM21BR71H105KA12
Part Number Capacitance (µF) TC Code Rated Voltage (V)
4.7 X5R 6.3 0603
1.0 X7R 50 0805
Recommended Diode Selection
Designator Manufacturer Part Number
D1 Zowie MSCD106 1.0 60 0805
Maximum average forward
rectified current (A)
Maximum repetitive peak
reverse voltage (V)
Layout Consideration
To Anode of
WLEDs
Via To OVP
V
OUT
C2
D1
LX
L1
C1
and GND. Connecting the capacitor with VIN and GND pins by short and wide tracks without using any vias for filtering and minimizing the input voltage ripple.
From Cathod of
WLEDs
R1
Refer to Fig. 1
the LX pin to minimize length of the copper tracks as well as the noise coupling into other circuits.
Optimized APW7209 Layout
ance c ircuit, the feedback network should be routed away from the inductor. The feedback pin and feed­back network should be shielded with a ground plane or track to minimize noise coupling into this circuit.
Dimensions
L x W x H (mm3)
Case size
Case size
V
IN
Via To V
OUT
V
EN
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APW7209
Pack age Information
SOT-23-6
D
e
b c
e1
SEE
VIEW A
E1
E
A2A1
A
L
VIEW A
0.25
GAUGE PLANE
SEATING PLANE
0
MAX.
0.15
0.50
0.22
1.80
0.60 8
SOT-23-6
MIN.
0.000
0.035
0.012
0.003
0.106
0.102
0.055
0.012 0
INCHES
MAX.
0.057
0.006
0.051
0.020
0.009
0.122
0.118
0.071
0.037 BSC
0.075 BSC
0.024
S Y M B O L
A A1 A2
b
c
D
E
E1
e
e1
L
0
Note : 1. Follow JEDEC TO-178 AB.
2. Dimension D and E1 do not include mold flash, protrusions or gate burrs. Mold flash, protrusion or gate burrs shall not exceed 10 mil per side.
MILLIMETERS
MIN.
1.45
0.00
0.90
0.30
0.08
2.70
2.60 3.00
1.40
0.95 BSC
1.90 BSC
0.30 0
1.30
3.10
8
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APW7209
Pack age Information
TSOT-23-6A
D
e
SEE VIEW A
E1
E
A
A1 A2
b c D E
E1 e e1
b
e1
A
A2A1
L
VIEW A
S
Y M B O L
0
MILLIMETERS
MIN.
0.70
0.01
0.70
0.30
0.08
2.70 3.10
2.60 3.00
1.40 1.80
0.95 BSC
1.90 BSC
0.30L 0°
TSOT-23-6A
INCHES
MAX.
1.00
0.10
0.90
0.50
0.20
0.60 8°
MIN.
0.028
0.000
0.028
0.012
0.003
0.106 0.122
0.102 0.118
0.055 0.071
0.037 BSC
0.075 BSC
0.012
c
0.25 GAUGE PLANE SEATING PLANE
MAX.
0.039
0.004
0.035
0.020
0.008
0.024
Note : Dimension D and E1 do not include mold flash, protrusions or gate burrs. Mold flash, protrusion or gate burrs shall not exceed 10 mil per side.
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APW7209
Carrier Tape & R eel Dimensions
OD0
B0
P0
P2
P1
A
E1
F
W
Application
SOT-23-6
Application
TSOT-23-6A
K0
SECTION A-A
B
A
H
A0
SECTION B-B
OD1
B
T
A
d
T1
A H T1 C d D W E1 F
178.0±2.00 50 MIN.
8.4+2.00
-0.00
13.0+0.50
-0.20
1.5 MIN. 20.2 MIN. 8.0±0.30 1.75±0.10 3.5±0.05
P0 P1 P2 D0 D1 T A0 B0 K0
4.0±0.10 4.0±0.10 2.0±0.05
1.5+0.10
-0.00
1.0 MIN.
0.6+0.00
-0.40
3.20±0.20 3.10±0.20 1.50±0.20
A H T1 C d D W E1 F
178.0±2.00 50 MIN.
8.4+2.00
-0.00
13.0+0.50
-0.20
1.5 MIN. 20.2 MIN. 8.0±0.30 1.75±0.10 3.5±0.05
P0 P1 P2 D0 D1 T A0 B0 K0
4.0±0.10 4.0±0.10 2.0±0.05
1.5+0.10
-0.00
1.0 MIN.
0.6+0.00
-0.40
3.20±0.20 3.10±0.20 1.50±0.20
Devices Per Unit
Package Type Unit Quantity
SOT-23-6
TSOT-23-6A
Copyright ANPEC Electronics Corp. Rev. A.8 - Sep., 2013
(mm)
Tape & Reel 3000 Tape & Reel 3000
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APW7209
Taping Direction Information
SOT-23-6
USER DIRECTION OF FEED
AAAX AAAX AAAX AAAX AAAX AAAX AAAX
TSOT-23-6A
USER DIRECTION OF FEED
AAAX AAAX AAAX AAAX AAAX AAAX AAAX
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APW7209
Classification Profile
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APW7209
Classification Reflow Profiles
Profile Feature Sn-Pb Eutectic Assembly Pb-Free Assembly
Preheat & Soak
Temperature min (T Temperature max (T Time (T
smin
to T
smax
smin
smax
) (ts)
)
)
Average ramp-up rate (T
to TP)
smax
Liquidous temperature (TL) Time at liquidous (tL)
Peak package body Temperature (Tp)*
Time (tP)** within 5°C of the specified classification temperature (Tc)
Average ramp-down rate (Tp to T
smax
Time 25°C to peak temperature
See Classification Temp in table 1 See Classification Temp in table 2
)
100 °C 150 °C
60-120 seconds
150 °C 200 °C
60-120 seconds
3 °C/second max. 3°C/second max.
183 °C
60-150 seconds
217 °C
60-150 seconds
20** seconds 30** seconds
6 °C/second max. 6 °C/second max.
6 minutes max. 8 minutes max.
* Tolerance for peak profile Temperature (Tp) is defined as a supplier minimum and a user maximum.
** Tolerance for time at peak profile temperature (tp) is defined as a supplier minimum and a user maximum. Table 1. SnPb Eutectic Process – Classification Temperatures (Tc)
Package
Thickness
<2.5 mm
Volume mm
3
Volume mm
<350
235 °C 220 °C
350
3
2.5 mm 220 °C 220 °C
Table 2. Pb-free Process – Classification Temperatures (Tc)
Package
Thickness
<1.6 mm
1.6 mm – 2.5 mm
Volume mm3
<350
Volume mm3
350-2000
Volume mm3
260 °C 260 °C 260 °C 260 °C 250 °C 245 °C
>2000
2.5 mm 250 °C 245 °C 245 °C
Reliability Test Program
Test item Method Description
SOLDERABILITY JESD-22, B102 HOLT JESD-22, A108 PCT JESD-22, A102 TCT JESD-22, A104 HBM MIL-STD-883-3015.7 MM JESD-22, A1 15 Latch-Up JESD 78
Copyright ANPEC Electronics Corp. Rev. A.8 - Sep., 2013
5 Sec, 245°C 1000 Hrs, Bias @ Tj=125°C 168 Hrs, 100%RH, 2atm, 121°C 500 Cycles, -65°C~150°C VHBM2KV VMM200V 10ms, 1tr≧100mA
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APW7209
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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