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copyright ? anpec electronics corp. rev. a.5 - apr., 2016 apa2018 www.anpec.com.tw 1 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. 3.6w constant output power class-d audio amplifier with class-g boost converter features general description operating voltage: 3v-5.2v 3.6w into 4 w load from 3.6v supply at 1%thd+n (wlcsp1.5x2-12) 3w into 4 w load from 3.6v supply at 1%thd+n (tqfn4x4-16) integrated class-g boost converter-increases efficiency at low output power low quiescent current of 3.5 ma from 3.6 v thermal and short-circuit protection with auto recovery 20db fixed gain lead free and green device available (rohs compliant) power enhanced packages - wlcsp 1.5x2-12 - tqfn 4x4-16 the apa2018 is a mono, high efficiency, filter-free class-d audio amplifier and is available in wlcsp1.5x2- 12 and tqfn4x4-16 package. the apa2018 is a high efficiency class-d audio power amplifier with an integrated class-g boost converter that enhances efficiency at low output power. it drives up to 3. 6w into an 4 w speaker (1%thd+n).with 85% typical efficiency, the apa2018 helps extend battery life when play- ing audio. the built-in boost converter generates a 5.75v supply voltage for the class-d amplifier when high output power is required. this provides a louder audio output than a stand-alone amplifier directly connected to the battery. during low audio output power periods, the boost con- verter deactivates and connects vbat directly to the class- d amplifier supply, pvdd. this improves overall efficiency. the apa2018 has an integrated low-pass filter to improve the rf rejection and reduce dac out-of-band noise, in- creasing the signal-to-noise ratio(snr). applications cell phones gps portable multimedia devices simplified application circuit out+ out- in+ in- en agnd audio input enable apa2018 vbat sw 2.2 m h 10 m f connected to supply pgnd pvdd bgnd 10m f~22 m f
copyright ? anpec electronics corp. rev. a.5 - apr., 2016 apa2018 www.anpec.com.tw 2 ordering and marking information 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). pin configuration wlcsp1.5x2-12 pvdd (a1) out- (c1) en (c2) out+ (b1) nc (b2) sw (a2) top view in+ (c3) vbat (b3) bgnd (a3) pgnd (d1) agnd (d2) in- (d3) nc 2 apa2018 vba t 1 in+ 3 in- 4 1 6 b g n d 1 5 s w 1 4 s w 12 pvdd 11 out + 10 p gnd 9 o ut- 1 3 p v d d e n 5 a g n d 6 p v d d 7 p v d d 8 tqfn4x4-16 (top view) apa2018 package code operating ambient temperature range i : -40 to 85 o c handling code lead free code lead free code handling code temperature range package code apa2018 ha : a18 x x - date code g : halogen and lead free device ha : wlcsp1.5x2-12 tr : tape & reel apa2018 qb : apa2018 xxxxx xxxxx - date code qb : tqfn4x4-16
copyright ? anpec electronics corp. rev. a.5 - apr., 2016 apa2018 www.anpec.com.tw 3 absolute maximum ratings (note 1) 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 "recom- mended operating conditions" is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability symbol parameter rating unit v bat supply voltage (vbat to gnd) -0.3 to 6 input voltage (in+, in- to gnd) -0.3 to v bat +0.3 input voltage (en to gnd) -0.3 to v bat +0.3 v t j maximum junction temperature 150 t stg storage temperature range -65 to +150 t sdr maximum soldering temperature range, 10 seconds 260 o c p d power dissipation internally limited w thermal characteristics (note 2,3) symbol parameter value unit q ja thermal resistance -junction to ambient (note2) wlcsp1.5x2-12 tqfn4x4-16 97 60 q jc thermal resistance -junction to case (note3) wlcsp1.5x2-12 tqfn4x4-16 36 12 o c/w note 2: q ja is measured with the component mounted on a high effective thermal conductivity test board in free air. note 3: the case temperature is measured at the center of the pgnd pin on the underside of the wlcsp1.53x1.98-12 and tqfn4x4- 16 package. range symbol parameter min. max. unit v bat supply voltage 3 5.2 vih high level threshold voltage en 1.3 - vil low level threshold voltage en - 0.6 v icm common mode input voltage 1 v dd -1 v t a ambient temperature range -40 85 t j junction temperature range -40 150 o c r l speaker resistance, 4 - w recommended operating conditions
copyright ? anpec electronics corp. rev. a.5 - apr., 2016 apa2018 www.anpec.com.tw 4 electrical characteristics apa2018 symbol parameter test condition min. typ. max. unit v bat supply voltage range 3 5.2 v en=vbat.boost converter active 5.75 class-d supply voltage range boost converter disabled(in bypass mode) 3 - 5.2 supply under voltage shutdown - 2.8 - control pin threshold 1.3 - - v thresholdv control pin threshold hysteresis en - 0.2 - v i dd operating quiescent current en = vbat = 3.6 v - 3.5 6 ma i sd shutdown quiescent current vbat = 2.5 v to 5.2 v, en = gnd - 0.2 1 m a input common-mode voltage range in+,in- 0.6 - 1.3 v t start-up start-up time - 6 10 ms boost converter i boost =0ma 5.4 5.8 6.4 pvdd boost converter output voltage range i boost =700ma - 5.6 - v boost converter input current limit power supply current - 2700 - boost converter starts up from il full shutdown - 600 - i l boost converter start-up current limit boost converter wakes up from auto-pass through mode - 1000 - ma f boost boost converter frequency - 1.2 - mhz class-d amplifier thd=1%, vbat=3.0v, f=1khz (wlcsp1.5x2-12) - 2 - thd=1%, vbat=3.6v, f=1khz (wlcsp1.5x2-12) - 2 - thd=1%, vbat=3.0v, f=1khz, rl=4 w +33 m h (wlcsp1.5x2-12) - 3.6 - thd=1%, vbat=3.6v, f=1khz, rl=4 w +33 m h (wlcsp1.5x2-12) - 3.7 - p o output power thd=1%, vbat=3.6v, f=1khz, rl=4 w +33 m h (tqfn4x4-16) - 3 - w a v voltage gain 19.5 20 20.5 db v os output offset voltage - 2 10 mv v bat =3.6v, v gnd =0v, rl=8 w +33 m h,t a = 25 o c (unless otherwise noted)
copyright ? anpec electronics corp. rev. a.5 - apr., 2016 apa2018 www.anpec.com.tw 5 electrical characteristics apa2018 symbol parameter test condition min. typ. max. unit class-d amplifier ocp short-circuit protection threshold current - 2 - a input impedance (per input pin) - 24 - r in input impedance in shutdown(per input pin) en=0v - 1300 - k w z o output impedance in shutdown - 2 - k w maximum input voltage swing en=0v - 2 - v rms boost converter auto-pass through threshold class-d output voltage threshold when boost converter automatically turns on - 2 - v pk f class-d class-d switching frequency 275 300 325 khz class-d and boost combined efficiency p o =500mw,vbat=3.6v - 90 - % a-weighted - 49 - v n noise output voltage unweighted - 65 - m v rms 1.7w, rl=8 w +33 m h. a-weighted - 97.5 - 1.7w, rl=8 w +33 m h. unweighted - 95 - 2w, rl=4 w +33 m h. a-weighted - 95 - snr signal-to-noise ratio 2w, rl=4 w +33 m h. unweighted - 93 - db p o =100mw, f=1khz - 0.06 - p o =500mw, f=1khz - 0.07 - p o =1.7w, f=1khz, r l =8 w +33 m h - 0.07 - thd+n total harmonic distortion plus noise p o =2w, f=1khz, r l =4 w +33 m h - 0.15 - % 200mv pp square ripple, v bat =3.8v, f=217hz - 70 - psrr ac-power supply ripple rejection(output referred) 200mv pp square ripple, v bat =3.8v, f=1khz - 70 - 200mv pp square ripple, v bat =3.8v, f=217hz - 71 - cmrr ac-common mode rejection ratio (output referred) 200mv pp square ripple, v bat =3.8v, f=1khz - 71 - db v bat =3.6v, v gnd =0v, rl=8 w +33 m h,t a = 25 o c (unless otherwise noted)
copyright ? anpec electronics corp. rev. a.5 - apr., 2016 apa2018 www.anpec.com.tw 6 pin description pin no. wlcsp tqfn name i/o/p function description a1 7,8,12,13 pvdd o boost converter output and class-d power stage supply voltage. a2 14,15 sw i boost converter switch input; connect boost inductor between vbat and sw. a3 16 bgnd p boost converter power ground. b1 11 out+ o positive audio output. b2 2 nc i nc b3 1 vbat p supply voltage. c1 9 out- o negative audio output. c2 5 en i device enable; set to logic high to enable. c3 3 in+ i positive audio input. d1 10 pgnd p class-d power ground. d2 6 agnd p analog ground. d3 4 in- i negative audio input.
copyright ? anpec electronics corp. rev. a.5 - apr., 2016 apa2018 www.anpec.com.tw 7 typical operating characteristics thd+n vs. output power t h d + n ( % ) 0.01 1 0.1 10 output power (w) f in =1khz r l =4 w +33 m h aux-0025 aes-17(20khz) 0 1 2 3 4 v dd =3.6v v dd =3v v dd =5v 5 thd+n vs. output power t h d + n ( % ) 0.01 1 0.1 10 output power (w) 0 1 2 3 f in =1khz r l =8 w +33 m h aux-0025 aes-17(20khz) v dd =3.6v v dd =3v v dd =5v thd+n vs. frequency t h d + n ( % ) frequency (hz) 20 20k 100 1k 10k 0.01 1 0.1 v dd =3.6v r l =4 w +33 m h c in =1 m f aux-0025 aes-17(20khz) 10 p o =1w p o =2w p o =0.5w thd+n vs. frequency t h d + n ( % ) frequency (hz) 20 20k 100 1k 10k 0.01 1 0.1 v dd =5v r l =4 w +33 m h c in =1 m f aux-0025 aes-17(20khz) 10 p o =1w p o =2w p o =0.5w thd+n vs. frequency t h d + n ( % ) frequency (hz) 20 20k 100 1k 10k 0.01 1 0.1 v dd =3.6v r l =8 w +33 m h c in =1 m f aux-0025 aes-17(20khz) 10 p o =0.5w p o =1.7w p o =0.1w thd+n vs. frequency t h d + n ( % ) frequency (hz) 20 20k 100 1k 10k 0.01 1 0.1 v dd =5v r l =8 w +33 m h c in =1 m f aux-0025 aes-17(20khz) 10 p o =0.5w p o =1.7w p o =0.1w
copyright ? anpec electronics corp. rev. a.5 - apr., 2016 apa2018 www.anpec.com.tw 8 typical operating characteristics output noise voltage vs. time o u t p u t n o i s e v o l t a g e ( v r m s ) 0 m 10 m 20 m 0 30 10 20 time (sec) r l =4 w +33 m h input ac gnd aux-0025 aes-17(20khz) 30 m 40 m 50 m v dd =3.6v v dd =3v v dd =5v output noise voltage vs. time o u t p u t n o i s e v o l t a g e ( v r m s ) 0 m 10 m 20 m 0 30 10 20 time (sec) r l =8 w +33 m h input ac gnd aux-0025 aes-17(20khz) 30 m 40 m 50 m v dd =3.6v v dd =3v v dd =5v psrr vs. frequency p o w e r s u p p l y r e j e c t i o n r a t i o ( d b ) frequency (hz) -100 -60 -40 20 20k 100 1k 10k -80 -20 0 v dd =3.6v r l =4 w +33 m h vrr=0.2vpp aes-17(20khz) input gnd input floating psrr vs. frequency p o w e r s u p p l y r e j e c t i o n r a t i o ( d b ) frequency (hz) -100 -60 -40 20 20k 100 1k 10k -80 -20 0 v dd =5v r l =4 w +33 m h vrr=0.2vpp aes-17(20khz) input gnd input floating psrr vs. frequency p o w e r s u p p l y r e j e c t i o n r a t i o ( d b ) frequency (hz) -100 -60 -40 20 20k 100 1k 10k -80 -20 0 v dd =3.6v r l =8 w +33 m h vrr=0.2vpp aes-17(20khz) input gnd input floating psrr vs. frequency p o w e r s u p p l y r e j e c t i o n r a t i o ( d b ) frequency (hz) -100 -60 -40 20 20k 100 1k 10k -80 -20 0 v dd =5v r l =8 w +33 m h vrr=0.2vpp aes-17(20khz) input gnd input floating
copyright ? anpec electronics corp. rev. a.5 - apr., 2016 apa2018 www.anpec.com.tw 9 typical operating characteristics frequence response g a i n ( d b ) frequency (hz) 20 100 1k 20k 0 +5 +10 +20 v dd =3.6v r l =4 w +33 m h po=150mw gain phase p h a s e ( d e g ) +180 +0 +100 +360 +260 +15 10k frequence response g a i n ( d b ) frequency (hz) 20 100 1k 20k 0 +5 +10 +20 v dd =3.6v r l =8 w +33 m h po=150mw gain phase p h a s e ( d e g ) +180 +0 +100 +360 +260 +15 10k shutdown current vs. supply voltage 0.0 0.0 1.0 2.0 3.0 4.0 5.0 supply voltage (v) s u p p l y c u r r e n t ( m a ) 0.4 0.8 1.2 2.0 1.6 no load supply current vs. supply voltage 0.0 0.0 1.0 2.0 3.0 4.0 5.0 supply voltage (v) s u p p l y c u r r e n t ( m a ) 1.0 2.0 3.0 5.0 4.0 no load
copyright ? anpec electronics corp. rev. a.5 - apr., 2016 apa2018 www.anpec.com.tw 10 block diagram bias control adaptive boost converter oscillator pwm h-bridge in- in+ en pvdd agnd vbat sw pvdd out+ out- agnd bgnd pgnd
copyright ? anpec electronics corp. rev. a.5 - apr., 2016 apa2018 www.anpec.com.tw 11 typical application circuit gnd en in- out- in+ out+ sw apa2018 (top view) 0.1 m f 0.1 m f input signal vbat 10k w 2.2 m h vbat 22 m f pvdd 22 m f 4 w gnd en in- out- in+ out+ sw apa2018 (top view) 0.1 m f 0.1 m f input signal vbat 10k w 2.2 m h vbat 10 m f pvdd 22 m f 8 w
copyright ? anpec electronics corp. rev. a.5 - apr., 2016 apa2018 www.anpec.com.tw 12 function descriptions boost converter auto pass through (apt) the apa2018 consists of a class-g boost converter and a class-d amplifier. the boost converter operates from the supply voltage, vbat, and generates a higher output voltage pvdd at 5.75 v. pvdd drives the supply voltage of the class-d amplifier. this improves loudness over non-boosted solutions. the boost converter has a pass through mode in which it turns off automatically and pvdd is directly connected to vbat through an internal bypass switch. the boost converter is adaptive and operates between pass through mode and boost mode depending on the output audio signal amplitude. when the audio output amplitude exceeds the auto pass through (apt) threshold, the boost converter is activated automatically and goes to boost mode. the transition time from nor- mal mode to boost mode is fast enough to prevent clip- ping large transient audio signals. apa2018 s apt thresh- old is fixed at 2 v peak . when the audio output signal is below apt threshold, the boost converter is deactivated and goes to pass through mode. the adaptive boost con- verter maximizes system efficiency at lower audio output levels. the class-g boost converter is designed to drive the class-d amplifier only. do not use the boost converter to drive external devices. boost converter component section the following is a list of terms and definitions used in the boost equations found later in this document. c - minimum boost capacitance required for a given ripple voltage on pvdd. l - boost inductor f boost - switching frequency of the boost converter. i pvdd - current pulled by the class-d amplifier from the boost converter. i l - average current through the boost inductor. pvdd - supply voltage for the class-d amplifier. (voltage generated by the boost converter output) vbat - supply voltage to the ic. d il - ripple current through the inductor. d v - ripple voltage on pvdd. inductor current rating is determined by the requirements of the load. the inductance is determined by two factors: the minimum value required for stability and the maxi- mum ripple current permitted in the application. use equa- tion 1 to determine the required current rating. equation 1 shows the approximate relationship between the aver- age inductor current, il, to the load current, load voltage, and input voltage (ipvdd, pvdd, and vbat, respectively). insert ipvdd, pvdd, and vbat into equation 1 and solve for il. the inductor must maintain at least 90% of its initial inductance value at this current. ripple current, d il, is peak-to-peak variation in inductor current. smaller ripple current reduces core losses in the inductor and reduces the potential for emi. use equa- tion 2 to determine the value of the inductor, l. equation 2 shows the relationship between inductance l, vbat, pvdd, the switching frequency, fboost, and d il. insert the maximum acceptable ripple current into equation 2 and solve for l. ? ? ? ? ? = 8 . 0 vbat pvdd pvdd i l i the critical external components are summarized in the following table: parameter test conditions min typ max unit boost converter inductor at 30% rated dc bias current of the inductor 1.5 2.2 4.7 h boost converter input capacitor 4.7 22 f boost converter output capacitor working capacitance biased at boost output voltage, if 4.7 m h inductor is chosen, then minimum capacitance is 10 m f 10 22 f inductor equations ? ? ? ? ? d - = pvdd i ) vbat pvdd ( vbat l boost l boost converter auto pass through (apt)
copyright ? anpec electronics corp. rev. a.5 - apr., 2016 apa2018 www.anpec.com.tw 13 function descriptions d il is inversely proportional to l. minimize d il is as much as necessary for a specific application. increase the in- ductance to reduce the ripple current. do not use greater than 4.7 m h, as this prevents the boost converter from responding to fast output current changes properly. if using above 3.3 m h, and then use at least 10 m f capaci- tance on pvdd to ensure boost converter stability. the typical inductor value range for the apa2018 is 2.2 m h to 3.3 m h. select an inductor with less than 0.5 w dc resistance, dcr. higher dcr reduces total efficiency due to an increase in voltage drop across the inductor. thermal protection boost converter capacitor selection the value of the boost capacitor is determined by the minimum value of working capacitance required for sta- bility and the maximum voltage ripple allowed on pvdd in the application. working capacitance refers to the avail- able capacitance after derating the capacitor value for dc bias, temperature, and aging. do not use any com- ponent with a working capacitance less than 6.8 m f. this corresponds to a 10 m f/16v capacitor or a 10 m f/10v capacitor. do not use above 22 m f capacitance as it will reduce the boost converter response time to large output current transients. equation 3 shows the relationship between the boost capacitance, c, to load current, load voltage, ripple voltage, input voltage, and switching frequency (ipvdd, pvdd, d v, vbat, and fboost respectively). insert the maximum allowed ripple voltage into equation 3 and solve for c. the 1.5 multiplier accounts for capaci- tance loss due to applied dc voltage and temperature for x5r and x7r ceramic capacitors. short circuit auto-recovery when a short circuit event happens, the apa2018 goes to low duty cycle mode and tries to reactivate itself every 1.8 seconds. the auto-recovery will continue until the short circuit event stops. this feature protects the device with- out affecting the device's long term reliability. ( ) pvdd v vbat pvdd i 5 . 1 c boost pvdd d - = the over-temperature circuit limits the junction tempera- ture of the apa2018. when the junction temperature ex- ceeds t j = +170 o c, a thermal sensor turns off the output buffer, allowing the devices to cool. the thermal sensor allows the amplifier to start-up after the junction tempera- ture down about 140 o c. the thermal protection designed with a 30 o c hysteresis lowers the average t j during con- tinuous thermal overload conditions, increasing lifetime of the ic.
copyright ? anpec electronics corp. rev. a.5 - apr., 2016 apa2018 www.anpec.com.tw 14 package information wlcsp1.50x2.0-12 pin 1 e d aaa nx c seating plane b e e/2 e s y m b o l min. max. 0.62 0.21 0.28 0.34 1.95 2.01 0.28 a a1 b d e e millimeters a2 0.28 0.34 0.50 bsc wlcsp1.50x2.0-12 0.020 bsc min. max. inches 0.024 0.008 0.011 0.013 0.011 0.013 0.077 0.080 0.011 1.50 1.56 0.059 0.061 aaa 0.05 0.002 0.49 0.019
copyright ? anpec electronics corp. rev. a.5 - apr., 2016 apa2018 www.anpec.com.tw 15 package information tqfn4x4-16 a b a1 a3 d pin 1 e pin 1 corner d2 e 2 e l k s y m b o l min. max. 0.80 0.00 0.25 0.35 1.90 2.10 0.05 1.90 a a1 b d d2 e e2 e l millimeters a3 0.20 ref tqfn4x4-16 0.40 0.50 2.10 0.008 ref min. max. inches 0.031 0.000 0.010 0.014 0.075 0.083 0.075 0.016 0.020 0.70 0.083 0.028 0.002 0.65 bsc 0.026 bsc 3.90 4.10 0.154 0.161 3.90 4.10 0.154 0.161 0.20 0.008 k
copyright ? anpec electronics corp. rev. a.5 - apr., 2016 apa2018 www.anpec.com.tw 16 carrier tape & reel dimensions a e 1 a b w f t p0 od0 b a0 p2 k0 b 0 section b-b section a-a od1 p1 h t1 a d devices per unit application a h t1 c d d w e1 f 330.0 2.00 50 min. 12.4+2.00 - 0.00 13.0+0.50 -0.20 1.5 min. 20.2 min. 12.0 0.30 1.75 0.10 5.5 0.05 p0 p1 p2 d0 d1 t a0 b0 k0 tqfn4x4-16 4.0 0.10 8.0 0.10 2.0 0.05 1.5+0.10 -0.00 1.5 min. 0.6+0.00 -0.40 4.30 0.20 4.30 0.20 1.00 0.20 (mm) package type unit quantity tqfn4x4-16 tape & reel 3000
copyright ? anpec electronics corp. rev. a.5 - apr., 2016 apa2018 www.anpec.com.tw 17 classification profile taping direction information tqfn4x4-16 user direction of feed
copyright ? anpec electronics corp. rev. a.5 - apr., 2016 apa2018 www.anpec.com.tw 18 classification reflow profiles profile feature sn-pb eutectic assembly pb-free assembly preheat & soak temperature min (t smin ) temperature max (t smax ) time (t smin to t smax ) (t s ) 100 c 150 c 60-120 seconds 150 c 200 c 60-120 seconds average ramp-up rate (t smax to t p ) 3 c/second max. 3 c/second max. liquidous temperature (t l ) time at liquidous (t l ) 183 c 60-150 seconds 217 c 60-150 seconds peak package body temperature (t p )* see classification temp in table 1 see classification temp in table 2 time (t p )** within 5 c of the specified classification temperature (t c ) 20** seconds 30** seconds average ramp-down rate (t p to t smax ) 6 c/second max. 6 c/second max. time 25 c to peak temperature 6 minutes max. 8 minutes max. * tolerance for peak profile temperature (t p ) is defined as a supplier minimum and a user maximum. ** tolerance for time at peak profile temperature (t p ) is defined as a supplier minimum and a user maximum. table 2. pb-free process C classification temperatures (tc) package thickness volume mm 3 <350 volume mm 3 350-2000 volume mm 3 >2000 <1.6 mm 260 c 260 c 260 c 1.6 mm C 2.5 mm 260 c 250 c 245 c 3 2.5 mm 250 c 245 c 245 c table 1. snpb eutectic process C classification temperatures (tc) package thickness volume mm 3 <350 volume mm 3 3 350 <2.5 mm 235 c 220 c 3 2.5 mm 220 c 220 c test item method description solderability jesd-22, b102 5 sec, 245 c holt jesd-22, a108 1000 hrs, bias @ tj=125 c pct jesd-22, a102 168 hrs, 100 % rh, 2atm, 121 c tct jesd-22, a104 500 cycles, -65 c~150 c hbm mil-std-883-3015.7 vhbm R 2kv mm jesd-22, a115 vmm R 200v latch-up jesd 78 10ms, 1 tr R 100ma reliability test program
copyright ? anpec electronics corp. rev. a.5 - apr., 2016 apa2018 www.anpec.com.tw 19 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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