APW7134QAITRL

APW7134 Dual 1.5MHz, 600mA Synchronous Step-Down Converter Features • • • • • • • • • • • • • 600mA Output Current on Each Channel 2.5V to 5.5V Input Voltage Range 1.5MHz Constant Frequency Operation Low Dropout Operation at 100% Duty Cycle Synchronous Topology 0.6V Low Reference Voltage Typically 0.1 µA Shutdown Current Current Mode Operation Over Temperature Protection Over Current Protection Up to 94% Efficiency Internally Compensated Lead Free Available (RoHS Compliant) General Description The APW7134 contains two independent 1.5MHz constant frequency, current mode, PWM step-down converters. Each converter integrates a main switch and a synchronous rectifier for high efficiency without an external Schottky diode. The APW7134 is ideal for powering portable equipment that runs from a single cell Lithium-Ion (Li+) battery. Each converter can supply 600mA of load current from a 2.5V to 5.5V input voltage. The output voltage can be regulated as low as 0.6V. The APW7134 can also run at 100% duty cycle for low dropout applications. Pinouts APW7134 (Top View) DFN-10 (3mm x 3mm) EN1 1 2 3 10 SW1 9 GND1 8 IN1 7 FB2 6 EN2 Applications • • TV Tuner/Box Portable Instrument FB1 IN2 GND2 4 SW2 5 Exposed pad on backside 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 © ANPEC Electronics Corp. Rev. A.1 - Aug., 2006 1 www.anpec.com.tw APW7134 Ordering and Marking Information APW7134 Lead Free Code Handling Code Temp. Range Package Code Package Code QA : DFN-10 Temp. Range I : -40 to 85° C Handling Code TU : Tube TR : Tape & Reel Lead Free Code L : Lead Free Device Blank : Original Device APW7134 QA: APW 7134 XXXXX XXXXX - 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 and compatible with both SnPb and lead-free soldiering operations. 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. Block Diagram Slop Compensation Σ ICOMP Frequency Shift FB1/ FB2 0.6V RQ SQ EN1/ EN2 Shutdown Control Logic RSENSE EA QSENSE QP SW1/ SW2 QN Oscillator IN1/ IN2 IRCMP GND1/ GND2 Diagram Represents 1/2 of the APW7134 Copyright © ANPEC Electronics Corp. Rev. A.1 - Aug., 2006 2 www.anpec.com.tw APW7134 Pin Description Pin No. 1 Name EN1 Function Channel 1 Enable Control Input. Drive EN1 above 1.5V to turn on the Channel 1. Drive EN1 below 0.3V to turn it off. In shutdown situation, all functions are disabled to decrease the supply current below 1µA.There is no pull high or pull low ability inside. Channel 1 Feedback Input. Connect FB1 to the center point of the external resistor divider. The feedback voltage is 0.6V. Channel 2 Supply Input. Bypass to GND with a 4.7µF or greater ceramic capacitor. Ground 2. Connected the exposed pad to GND2. Channel 2 Power Switch Output. Inductor connection to drains of the internal PMOSFET and NMOSFET switches. Channel 2 Enable Control Input. Drive EN2 above 1.5V to turn on the Channel 2. Drive EN2 below 0.3V to turn it off. In shutdown situation, all functions are disabled to decrease the supply current below 1µA.There is no pull high or pull low ability inside. Channel 2 Feedback Input. Connect FB2 to the center point of the external resistor divider. The feedback voltage is 0.6V. Channel 1 Supply Input. Bypass to GND with a 4.7µF or greater ceramic capacitor. Ground 1. Connected the exposed pad to GND1. Channel 1 Power Switch Output. Inductor connection to drains of the internal PMOSFET and NMOSFET switches. 2 3 4 5 FB1 IN2 GND2 SW2 6 EN2 7 8 9 10 FB2 IN1 GND1 SW1 Absolute Maximum Ratings Symbol VIN1/IN2 VFB1/FB2 VEN1/EN2 VSW1/SW2 ISW_PEAK TJ TSTG TSDR VESD Parameter Input Supply Voltage (IN1/IN2 to GND1/GND2) Voltage on FB1 and FB2 Voltage on EN1 and EN2 Voltage on SW1 and SW2 Peak SW Current Junction temperature Storage temperature Soldering temperature, 10 seconds Minimum ESD rating (Human body mode) (Note 1) Value -0.3 ~ 6 -0.3 ~ VIN1/IN2+0.3 -0.3 ~ VIN1/IN2+0.3 -0.3 ~ VIN1/IN2+0.3 1.3 150 -65 ~ 150 300 ±3 Unit V V V V A °C °C °C KV Note 1: The device is ESD sensitive. Handling precautions are recommended. Thermal Characteristics Symbol θJA Parameter Junction-to-Ambient Resistance in free air (Note 2) Value 50 Unit °C/W Note 2: θJA is measured on approximately 1¨ square of 1 oz copper. Copyright © ANPEC Electronics Corp. Rev. A.1 - Aug., 2006 3 www.anpec.com.tw APW7134 Recommended Operating Conditions (Note 3) Symbol VIN1/IN2 R2/R4 IOUT TA TJ Parameter Input Supply Voltage (IN1/IN2 to GND1/GND2) Feedback Resistance (Note 3) Output Current Operating ambient temperature Operating junction temperature Min. 2.5 Value Typ. Max. 5.5 200 600 85 125 Unit V KΩ mA °C °C -40 -40 Note 3: Please refer to the typical application circuit. Electrical Characteristics The * denotes the specifications that apply over TA = -40°C ~ 85°C, otherwise specifications are at TA=25°C Symbol Parameter Test Conditions Min. * VFB1/FB2=0.6V * * 2.5 -30 0.588 APW7134 Typ. Max. 5.5 30 0.6 0.612 Unit V nA V VIN1/IN2 Each Converter Input Voltage Range IFB1/FB2 Each Converter Feedback current VFB1/FB2 ∆VFB1/FB2 Each Converter Regulated Feedback Voltage Each Converter Reference voltage Line regulation VIN1/IN2=2.5V to 5.5V VIN1/IN2=3V,VFB=0.5V IPK Each Converter Peak Inductor Current or VOUT=90%, Duty cycle < 35% VLOADR Each Converter Load Regulation IQ Each Converter Quiescent Current Duty Cycle=0; VFB=1.5V * 0.04 0.4 %/V 0.75 1 1.25 A 0.5 300 400 % µA Copyright © ANPEC Electronics Corp. Rev. A.1 - Aug., 2006 4 www.anpec.com.tw APW7134 Electrical Characteristics (Cont.) The * denotes the specifications that apply over TA = -40°C ~ 85°C, otherwise specifications are at TA=25°C Symbol Parameter Each Converter Quiescent Current in Shutdown Each Converter Oscillator Frequency Test Conditions Min. APW7134 Typ. 0.1 1.2 1.5 210 0.4 0.5 Max. 1 1.8 Unit IQ-SD fOSC VEN1/EN2=0V,VIN=4.2V VFB=0.6V VFB=0V ISW=100mA µA MHz KHz Ω Ω fOSC_FFB Each Converter Frequency Foldback RDS-P Each Converter On Resistance of PMOSFET Each Converter On Resistance of NMOSFET Each Converter SW Leakage Current RDS-N ISW=-100mA VEN1=0V,VSW=0V or 5V,VIN=5V * * 0.35 0.45 ILSW ±0.01 0.3 1 ±0.01 ±1 1.5 ±1 µA V µA VEN1/EN2 Each Converter Enable Threashold IEN1/EN2 EN1/EN2 Leakage Current Application Circuit VIN1/IN2 CIN1 4.7uF OFF ON VOUT1 1.8V 600mA L1 2.2uH 8 IN1 1 EN1 IN2 EN2 6 L2 2.2uH 3 CIN2 4.7uF OFF ON VOUT2 3.3V 600mA R5 100K Ω R6 100K Ω 10 SW1 APW7134 SW2 5 R1 300KΩ COUT1 10uF R2 150K Ω 2 FB1 GND1 GND2 9 4 FB2 7 R3 680K Ω R4 150K Ω COUT2 10uF Typical Application Copyright © ANPEC Electronics Corp. Rev. A.1 - Aug., 2006 5 www.anpec.com.tw APW7134 Typical Operating Characteristics Reference Voltage 0.615 0.610 VIN=5.5V Oscillator Frequency 1800 1700 Reference Voltage (V) Frequency (KHz) 0.605 0.600 0.595 0.590 0.585 -50 -25 0 25 50 VIN=2.5V 1600 1500 1400 1300 1200 VIN=3.6V 75 100 125 -50 -25 0 25 50 75 100 125 Temperature (o C) Temperature (o C) Oscillator Frequency vs Supply Voltage 1800 700 RDS(ON) vs Temperature VIN=2.7V TA=25o C 1700 1600 1500 1400 1300 1200 2 3 4 5 6 600 VIN=4.2V VIN=3.6V ON Resistance (mΩ) Frequency (KHz) 500 400 300 200 100 0 -50 -25 0 25 50 75 100 125 NMOS PMOS Supply Voltage (V) Temperature (o C) Copyright © ANPEC Electronics Corp. Rev. A.1 - Aug., 2006 6 www.anpec.com.tw APW7134 Typical Operating Characteristics (Cont.) RDS(ON) vs Input Voltage 600 500 Efficiency vs Output Current 100 90 PMOS VOUT=1.2V TA=25o C VIN=2.7V ON Resistance (mΩ) 80 70 Efficiency (%) 400 300 NMOS 60 50 40 30 20 10 VIN=3.6V 200 100 0 0 1 2 3 4 5 6 VIN=4.2V 0 0.1 1.0 10.0 100.0 1000.0 Input Voltage (V) Output Current (mA) Efficiency vs Output Current 100 90 80 70 100 Efficiency vs Output Current VOUT=1.5V TA=25o C VIN=2.7V 90 80 VOUT=2.5V TA=25o C VIN=4.2V Efficiency (%) VIN=3.6V 70 60 50 40 30 20 10 0 0.1 1.0 10.0 100.0 1000.0 Efficiency (%) VIN=3.6V 60 50 40 30 20 10 0 0.1 1.0 10.0 100.0 1000.0 VIN=4.2V VIN=2.7V Output Current (mA) Output Current (mA) Copyright © ANPEC Electronics Corp. Rev. A.1 - Aug., 2006 7 www.anpec.com.tw APW7134 Typical Operating Characteristics (Cont.) Efficiency vs Input Voltage 100 95 90 Efficiency vs Input Voltage 100 95 IOUT=100mA IOUT=600mA IOUT=100mA 90 85 Efficiency (%) 85 80 75 Efficiency (%) IOUT=600mA 80 75 70 65 60 VOUT=1.8V TA=25o C IOUT=10mA IOUT=10mA 70 65 60 55 50 2 3 4 5 6 VOUT=1.5V TA=25o C 55 50 2 3 4 5 6 Input Voltage (V) Input Voltage (V) Efficiency vs Input Voltage 100 95 90 85 Dynamic Supply Current vs Supply Voltage 400 IOUT=100mA 380 Dynamic Supply Current (µA) 5 6 360 340 320 300 280 260 240 220 200 2 3 4 5 6 Efficiency (%) IOUT=600mA 80 75 70 65 60 55 50 2 3 4 IOUT=10mA VOUT=2.5V TA=25o C Input Voltage (V) Supply Voltage (V) Copyright © ANPEC Electronics Corp. Rev. A.1 - Aug., 2006 8 www.anpec.com.tw APW7134 Typical Operating Characteristics (Cont.) PMOSFET Leakage vs Temperature 300 250 200 150 100 50 0 -50 -25 0 25 50 75 100 125 NMOSFET Leakage vs Temperature 800 750 700 650 600 550 500 -50 -25 0 25 50 75 100 125 PMOSFET Leakag(nA) VIN=5.5V NMOSFET Leakage(nA) VIN=5.5V Temperature (o C) Temperature (o C) Functional Descriptions Main Control Loop The APW7134 has dual independent constant frequency current mode PWM step-down converters. All the main and synchronous switches are internal to reduce the external components. During normal operation, the internal PMOSFET is turned on, but is turned off when the inductor current at the input of ICOMP to reset the RS latch. The load current increases, it causes a slight decrease in the feedback voltage, which in turn, causes the EA’ output voltage to ins crease until the average inductor current matches the new load current. While the internal power PMOSFET is off, the internal power NMOSFET is turned on until the inductor current starts to reverse, as indicated by the current reversal comparator IRCMP, or the beginning of next cycle. When the NMOSFET is turned off by IRCMP, it operates in the discontinuous conduction mode. In the short circuit situation, the output voltage is almost zero volts. Output current is limited by the ICOMP to prevent the damage of electrical circuit. In the normal operation, the two straight line of the inductor current ripple have the same height, it means the volts-seconds product is the same. When the short circuit operation occurs, the output voltage down to Copyright © ANPEC Electronics Corp. Rev. A.1 - Aug., 2006 9 www.anpec.com.tw Pulse Skipping Mode Operation At light load with a relative small inductance, the inductor current may reach zero. The internal power NMOSFET is turned off by the current reversal comparator, IRCMP, and the switching voltage will ring. This is discontinuous mode operation, and is normal behavior for the switching regulator. At very light load, the APW7134 will automatically skip some pulses in the pulse skipping mode to maintain the output regulation. The skipping process modulates smoothly depend on the load. Short Circuit Protection APW7134 Functional Descriptions (Cont.) Short Circuit Protection Cont. zero leads to the voltage across the inductor maximum in the on period and the voltage across the inductor minimum in the off period. In order to maintain the volts-seconds balance, the off-time must be extended to prevent the inductor current run away. Frequency decay will extend the switching period to provide more times to the off-period, then the inductor current have to restrict to protect the electrical circuit in the short situation. Dropout Operation An important detail to remember is that on resistance of PMOSFET switch will increase at low input supply voltage. Therefore, the user should calculate the power dissipation when the APW7134 is used at 100% duty cycle with low input voltage. Slope Compensation Slope compensation provides stability in constant frequency current mode architecture by preventing sub-harmonic oscillations at high duty cycle. It is accomplished internally by adding a compensating ramp to the inductor current signal at duty cycle in excess of 40%. Normally, this results in a reduction of maximum inductor peak current for duty cycles greater than 40%. In the APW7134, the reduction of inductor peak current recovered by a special skill at high duty ratio. This allow the maximum inductor peak current maintain a constant level through all duty ratio. Application Description Inductor Selection selecting a low DC resistance inductor is a helpful way. Due to the high switching frequency as 1.5MHz, the Another important parameter is the DC current rating inductor value of the application field of APW7134 is of the inductor. The minimum value of DC current usually from 1µH to 4.7µH. The criterion to selecting a rating equals the full load value of 600mA, plus the suitable inductor is dependent on the worst current half of the worst current ripple, 120mA. Choose ripple throughout the inductor. The worst current ripple inductors with suitable DC current rating to ensure defines as 40% of the fully load capability. In the the inductors don’ operate in the saturation. t APW7134 applications, the worst value of current ripple is 240mA, the 40% of 600mA. Evaluate L by Input Capacitor Selection equation (1): L= The input capacitor must be able to support the − V OUT V IN (V IN ) ⋅ V OUT ⋅ 1 ∆ IL ⋅ f S maximum input operating voltage and maximum RMS (1) input current. The Buck converter absorbs current from input in pulses. where fS is the switching frequency of APW7134 and ∆IL is the value of the worst current ripple, it can be any value of current ripple that smaller than the worst value you can accept. In order to perform high efficiency, Copyright © ANPEC Electronics Corp. Rev. A.1 - Aug., 2006 10 www.anpec.com.tw APW7134 Application Description (Cont.) Input Capacitor Selection Cont. Observe the waveform of I(CIN),the RMS value of I(CIN) is I(CIN ) = I(Q1) IIN I(CIN) Q1 L VIN CIN Q2 I(L) COUT I(COUT) IOUT [(I OUT − IIN ) ⋅ D + IIN ⋅ 1− D 2 2 ]( ) 2 (2) Replace D and IIN by following relation: D= VOUT VIN (3) (4) IIN = D ⋅ IOUT The RMS value of input capacitor current equal: I(C IN ) = IOUT ⋅ D(1 − D ) ) PWM (5) Figure-1 Figure-1 shows a schematic of a Buck structure. The waveforms show as Figure-2. IL IOUT IIN When D=0.5 the RMS current of input capacitor will be maximum value. Use this value to choose the input capacitor with suitable current rating. Output Capacitor Selection The output voltage ripple is a significant parameter to estimate the performance of a convertor. There are two discrete components that affect the output voltage ripple bigger or smaller. It is recommended to use the criterion has mentioned above to choose a suitable inductor. Then based on this known inductor current ripple condition, the value and properties of output capacitor will affect the output voltage ripple better or worse. The output voltage ripple consists of two portions, one is the product of ESR and inductor current ripple, the other portion is a function of the I(COUT) 0A 0A IIN I(CIN) 0A inductor current ripple and the output capacitance. Figure-3 shows the waveforms to explain the part decided by the output capacitance. I(Q1) IOUT 0A D*TS (1-D)*TS 0A PWM 0.5TS 0A ∆ IL I(COUT) ∆VOUT1 V OUT Figure-2 Figure-3 Copyright © ANPEC Electronics Corp. Rev. A.1 - Aug., 2006 11 www.anpec.com.tw APW7134 Application Description (Cont.) Output Capacitor Selection Evaluate the ∆VOUT1 by the ideal of energy equalization. According to the definition of Q, Q= 11 1  ∆IL ⋅ TS  = C OUT ⋅ ∆VOUT 1 22 2 Output Voltage Setting APW7134 has the adjustable version for output volt age setting by the users. A suggestion of maximum (6) value of R2 is 200KΩ to keep the minimum current that provides enough noise rejection ability through the resistor divider. The output voltage programmed by the equation:  R VOUT = 0 .6 ⋅  1 + 1   R2    VOUT where TS is the inverse of switching frequency and the ∆IL is the inductor current ripple. Move the COUT to the left side to estimate the value of ∆VOUT1 as equation (7). ∆ VOUT 1 ∆ IL ⋅ TS = 8 ⋅ C OUT (11) (7) APW7134 As mentioned above, one part of output voltage ripple is the product of the inductor current ripple and ESR of output capacitor. The equation (8) explains the output voltage ripple estimation. ∆VOUT  TS   = ∆IL ⋅  ESL +  8 ⋅ C OUT    R2 R1 FB (8) Layout Considerations The high current paths (GND1/GND2, IN1/IN2 and SW1/SW2) should be placed very close to the device with short, direct and wide traces. Input capacitors should be placed as close as possible to the respective IN and GND pins. The external feedback resistors shall be placed next to the FB pins. Keep the switching nodes SW1/SW2 short and away from the feedback network. Thermal Considerations APW7134 is a high efficiency switching converter, it means less power loss transferred into heat. Due to the on resistance difference between internal power PMOSFET and NMOSFET, the power dissipation in the high converting ratio is greater than low converting ratio. The worst case is in the dropout operation, the mainly conduction loss dissipate on the internal power PMOSFET. The power dissipation nearly defined as: PD = (IOUT ) RDS_ ONP ⋅ D + RDS_ ONN ⋅ (1− D) 2 [ ] (9) APW7134 has internal over temperature protection. W hen the junction temperature reaches 150 centigrade, APW7134 will turn off both internal power PMOSFET and NMOSFET. The estimation of the junction temperature, TJ, defined as: TJ = PD ⋅ θ JA (10) where the θJA is the thermal resistance of the package utilized by APW7134. Copyright © ANPEC Electronics Corp. Rev. A.1 - Aug., 2006 12 www.anpec.com.tw APW7134 Package Information DFN-10 D A E D2 A1 A3 e Dim A A1 A3 b D D2 E E2 e L Millimeters Min. Max. 0.80 1.00 0.00 0.05 0.20 REF 0.18 0.30 3.00 BSC 2.20 2.50 3.00 BSC 1.50 1.80 0.50 BSC 0.35 0.45 L E2 Inches Min. Max. 0.031 0.039 0.000 0.002 0.008 REF 0.007 0.012 0.118 BSC 0.087 0.098 0.118 BSC 0.059 0.071 0.016 BSC 0.014 0.018 Copyright © ANPEC Electronics Corp. Rev. A.1 - Aug., 2006 13 b www.anpec.com.tw APW7134 Carrier Tape & Reel Dimensions t E Po P P1 D F W Bo Ao D1 Ko T2 J C A B T1 Application A 178 ± 1 B C J T1 12.3 ± 1 P1 T2 1.4 ± 0.5 Ao W 12 ± 0.3 Bo 3.3 ± 0.1 P E 54.4 ± 0.4 13.0 + 0.2 2.3 ± 0.1 D D1 1.5 + 0.1 Po 8.0 ± 0.1 1.75 ± 0.1 Ko T DFN-10 F 5.5 ± 0.05 1.5 + 0.1 4.0 ± 0.1 2.0 ± 0.05 3.3 ± 0.1 1.1 ± 0.1 0.3 ± 0.05 (mm) Cover Tape Dimensions Application DFN-10 Carrier Width 12 Cover Tape Width 9.2 Devices Per Reel 3000 Copyright © ANPEC Electronics Corp. Rev. A.1 - Aug., 2006 14 www.anpec.com.tw APW7134 Physical Specifications Terminal Material Lead Solderability Solder-Plated Copper (Solder Material : 90/10 or 63/37 SnPb), 100%Sn Meets EIA Specification RSI86-91, ANSI/J-STD-002 Category 3. Reflow Condition (IR/Convection or VPR Reflow) TP Ramp-up tp Critical Zone T L to T P Temperature TL Tsmax tL Tsmin Ramp-down ts Preheat 25 t 25 °C to Peak Tim e Classificatin 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/Classificatioon Temperature (Tp) Time within 5°C of actual Peak Temperature (tp) Ramp-down Rate Sn-Pb Eutectic Assembly 3°C/second max. 100°C 150°C 60-120 seconds 183°C 60-150 seconds See table 1 10-30 seconds Pb-Free Assembly 3°C/second max. 150°C 200°C 60-180 seconds 217°C 60-150 seconds See table 2 20-40 seconds 6°C/second max. 6°C/second max. 6 minutes max. 8 minutes max. Time 25°C to Peak Temperature Notes: All temperatures refer to topside of the package .Measured on the body surface. Copyright © ANPEC Electronics Corp. Rev. A.1 - Aug., 2006 15 www.anpec.com.tw APW7134 Classificatin Reflow Profiles(Cont.) T able 1. SnPb Entectic Process – Package Peak Reflow Temperatures 3 3 P ackage Thickness Volum e m m Volume mm < 350 ≥ 350 < 2.5 m m 240 +0/-5 ° C 225 +0/-5 ° C ≥ 2.5 m m 225 +0/-5 ° C 225 +0/-5 ° C T able 2. Pb-free Process – Package Classification Reflow Temperatures 3 3 3 P ackage Thickness Volume mm Volume mm Volume mm < 350 3 50-2000 > 2000 < 1.6 m m 260 +0 ° C* 260 +0 ° C* 260 +0 ° C* 1 .6 m m – 2.5 m m 260 +0 ° C* 250 +0 ° C* 245 +0 ° C* ≥ 2.5 m m 250 +0 ° C* 245 +0 ° C* 245 +0 ° C* * Tolerance: The device manufacturer/supplier s hall a ssure process compatibility up to and including the stated classification temperature (this means Peak reflow temperature +0 ° C. For example 260 ° C+0 ° C) at the rated MSL level. Reliability test program Test item S OLDERABILITY H OLT P CT T ST 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 245 °C, 5 SEC 1000 Hrs Bias @125°C 168 Hrs, 100% RH, 121°C -65°C~150°C, 200 Cycles VHBM > 2KV, VMM > 200V 10ms, 1 tr > 1 00mA 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 : 7F, No. 137, Lane 235, Pac Chiao Rd., Hsin Tien City, Taipei Hsien, Taiwan, R. O. C. Tel : 886-2-89191368 Fax : 886-2-89191369 Copyright © ANPEC Electronics Corp. Rev. A.1 - Aug., 2006 16 www.anpec.com.tw