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c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 1 - a p r . , 2 0 0 8 a p w 7 1 4 3 w w w . a n p e c . c o m . t w 1 a n p e c r e s e r v e s t h e r i g h t t o m a k e c h a n g e s t o i m p r o v e r e l i a b i l i t y o r m a n u f a c t u r a b i l i t y w i t h o u t n o t i c e , a n d a d v i s e c u s t o m e r s t o o b t a i n t h e l a t e s t v e r s i o n o f r e l e v a n t i n f o r m a t i o n t o v e r i f y b e f o r e p l a c i n g o r d e r s . 3 a , 1 2 v , a s y n c h r o n o u s b u c k c o n v e r t e r the apw7143 is a 3a asynchronous buck converter with an integrated 70m w p-channel power mosfet. the apw7143, designed with a current-mode control scheme, can convert wide input voltage of 4.3v to 14v to the outp ut voltage adjustable from 0.8v to v in to provide excellent output voltage regulation. for high efficiency over all load current range, the ap w7143 is equipped with an automatic skip/pwm mode operation. at light load, the ic operates in the skip mode, which keeps a constant minimum inductor peak current, to reduce switching losses. at heavy load, the ic works in pwm mode, which inductor peak current is pro- grammed by the comp voltage, to provide high efficiency and excellent output voltage regulation. th e apw7143 is also equipped with power-on-r eset, soft-s tart, and whole protections (underv oltage, over temperature, and current-limit) into a single package. in shutdown mode, the supply current drops below 3 m a. this device, available in an 8-pin sop-8 package, pro- vides a very compact system solution with minimal exter- nal components and pcb area. f e a t u r e s g e n e r a l d e s c r i p t i o n w i d e i n p u t v o l t a g e f r o m 4 . 3 v t o 1 4 v o u t p u t c u r r e n t u p t o 3 a adjustable output voltage from 0.8v to v in - 2% system accuracy 7 0 m w i n t e g r a t e d p o w e r m o s f e t h i g h e f f i c i e n c y u p t o 9 2 % - automatic skip/pwm mode operation c u r r e n t - m o d e o p e r a t i o n - e a s y f e e d b a c k c o m p e n s a t i o n - s t a b l e w i t h l o w e s r o u t p u t c a p a c i t o r s - f a s t l o a d / l i n e t r a n s i e n t r e s p o n s e p o w e r - o n - r e s e t m o n i t o r i n g f i x e d 5 0 0 k h z s w i t c h i n g f r e q u e n c y i n p w m m o d e b u i l t - i n d i g i t a l s o f t - s t a r t c u r r e n t - l i m i t p r o t e c t i o n w i t h f r e q u e n c y f o l d b a c k h i c c u p - m o d e 5 0 % u n d e r v o l t a g e p r o t e c t i o n o v e r - t e m p e r a t u r e p r o t e c t i o n < 3 m a q u i e s c e n t c u r r e n t i n s h u t d o w n m o d e s m a l l s o p - 8 p a c k a g e lead free and green devices available (rohs compliant) a p p l i c a t i o n s o l p c , u m p c n o t e b o o k c o m p u t e r h a n d h e l d p o r t a b l e d e v i c e step-down converters requiring high efficiency and 3a output current o u t p u t c u r r e n t , i o u t ( a ) efficiency, (%) 0 10 20 30 40 50 60 70 80 90 100 0.001 0.01 0.1 1 10 v in =5v, v out =3.3v, l1=2.2 m h v in =12v, v out =5v, l1=6.8 m h v in =12v, v out =3.3v, l1=4.7 m h
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 1 - a p r . , 2 0 0 8 a p w 7 1 4 3 w w w . a n p e c . c o m . t w 2 o r d e r i n g a n d m a r k i n g i n f o r m a t i o n a b s o l u t e m a x i m u m r a t i n g s ( n o t e 2 ) symbol parameter rating unit v in vin supply voltage (vin to agnd) - 0.3 ~ 15 v > 100ns - 1 ~ v in +1 v lx lx to a gnd voltage < 100ns - 5 ~ v in +5 v en to agnd voltage - 0.3 ~ v in +0.3 v fb, comp to agnd voltage - 0.3 ~ 6 v maximum junction temperat ure 150 o c t stg storage temperature - 65 ~ 150 o c t sdr maximum lead soldering temperature, 10 seconds 260 o c n o t e 2 : s t r e s s e s a b o v e t h o s e l i s t e d i n ? a b s o l u t e m a x i m u m r a t i n g s ? m a y c a u s e p e r m a n e n t d a m a g e t o t h e d e v i c e . t h e r m a l c h a r a c t e r i s t i c s symbol parameter value unit q ja junction - to - ambient thermal resistance in free air (note 3 ) sop - 8 80 o c/w note 3 : q ja is measured with the component mounted on a high effective thermal conductivity test board in free air. p i n c o n f i g u r a t i o n apw7143 sop-8 top view 1 2 3 4 8 7 6 5 lx lx en comp vin nc agnd fb pin 7 and 8 must be externally connected together. apw7143 package code k : sop-8 operating junction temperature range i : -40 to 85 c handling code tr : tape & reel assembly material l : lead free device g : halogen and lead free device handling code temperature range package code assembly material apw7143 k : xxxxx - date code apw7143 xxxxx n o t e : a n p e c l e a d - f r e e p r o d u c t s c o n t a i n m o l d i n g c o m p o u n d s / d i e a t t a c h m a t e r i a l s a n d 1 0 0 % m a t t e t i n p l a t e t e r m i n a t i o n f i n i s h ; w h i c h a r e f u l l y c o m p l i a n t w i t h r o h s . a n p e c l e a d - f r e e p r o d u c t s m e e t o r e x c e e d t h e l e a d - f r e e r e q u i r e m e n t s o f i p c / j e d e c j - s t d - 0 2 0 c f o r m s l c l a s s i f i c a t i o n a t l e a d - f r e e p e a k r e f l o w t e m p e r a t u r e . a n p e c d e f i n e s ? g r e e n ? t o m e a n l e a d - f r e e ( r o h s c o m p l i a n t ) a n d h a l o g e n f r e e ( b r o r c l d o e s n o t e x c e e d 9 0 0 p p m b y w e i g h t i n h o m o g e n e o u s m a t e r i a l a n d t o t a l o f b r a n d c l d o e s n o t e x c e e d 1 5 0 0 p p m b y w e i g h t ) .
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 1 - a p r . , 2 0 0 8 a p w 7 1 4 3 w w w . a n p e c . c o m . t w 3 symbol parameter range unit v in vin supply voltage 4. 3 ~ 1 4 v v out converter output voltage 0.8 ~ v in v i out converter output current 0 ~ 3 a c in converter input capacitor (mlcc) 8 ~ 50 m f converter output capacitor 20 ~ 100 0 m f c out effective series resistance 0 ~ 60 m w l out converter output inductor 1 ~ 22 m h resistance of the feedback resistor connected from fb to a gnd 1 ~ 20 k w t a ambient temperature - 40 ~ 85 o c t j junction temperature - 40 ~ 125 o c note 4: refer to the typical a pplication circuits r e c o m m e n d e d o p e r a t i n g c o n d i t i o n s (note 4) e l e c t r i c a l c h a r a c t e r i s t i c s refer to the typical application circuits. these specifications apply over v in = 12 v, v out =3.3 v , and t a = - 4 0 ~ 85 c, unless otherwise specified. typical values are at t a =25c. apw714 3 symbol parameter test conditions min typ max unit supply current i v in vin supply current v fb = v ref +50mv, v en =3v, lx=nc - 0.5 1.5 ma i vin_sd vin shutdown supply current v en = 0v - - 3 m a power - on - reset (por) voltage threshold vin por voltage threshold v in rising 3. 9 4.1 4. 3 v vin por hysteresis - 0. 5 - v reference voltage v ref reference voltage regulated on fb pin - 0.8 - v t j = 25 o c, i out = 1 0 m a, v in =12v - 1.0 - +1.0 output voltage accuracy i out = 1 0 m a ~3a , v in = 4.75~14 v - 2.0 - +2.0 % line regulation v in = 4. 7 5v to 1 4 v - +0.02 - % /v load regulation i out = 0.5a ~ 3a - - 0.04 - % /a oscillator and duty cycle f osc oscillator frequency t j = - 40 ~ 125 o c, v in = 4. 7 5 ~ 1 4 v 450 500 550 khz foldback frequency v out = 0v - 80 - khz maximum converter?s duty - 99 - % t on_min minimum pulse width of lx - 1 5 0 - ns current - mode pwm converter gm error amplifier transconductance v fb =v ref 50mv - 200 - m a/v error amplifier dc gain comp = nc - 80 - db
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 1 - a p r . , 2 0 0 8 a p w 7 1 4 3 w w w . a n p e c . c o m . t w 4 e l e c t r i c a l c h a r a c t e r i s t i c s ( c o n t . ) refer to the typical application circuits. these specifications apply over v in = 12 v, v out = 3.3 v , and t a = - 4 0 ~ 85 c, unless otherwise specified. typical values are at t a =25c. apw7143 symbol parameter test conditions min typ max unit current - sense to comp voltage transresistance - 0.06 - v/a v in = 5v , t j = 25 c - 9 0 110 p - channel switch resistance v in = 12v , t j = 25 c - 70 90 m w protections i lim p - channel switch current - limit peak current 5 .0 6 .5 8 .0 a v th_uv fb under - voltage threshold v fb falling 45 50 55 % fb under - voltage debounce - 1 - m s t otp over - temperature trip point - 150 - o c over - temperature hysteresis - 40 - o c soft - start, softstop, enable and input currents t ss soft - start 1.5 2 2. 5 ms lx pull - low switch resistance switch is turned on for 2 ms (typ.) interval from the falling edge of enable signal. - 10 - w en shutdown voltage threshold v en falling 0.5 - - v en enable voltage threshold - - 2.1 v p - channel switch leakage current v en = 0v, v lx = 0v - - 2 m a i fb fb pin input current - 100 - +100 na i en en pin input current v en = 0v ~ v in - 100 - +100 na
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 1 - a p r . , 2 0 0 8 a p w 7 1 4 3 w w w . a n p e c . c o m . t w 5 t y p i c a l o p e r a t i n g c h a r a c t e r i s t i c s v i n i n p u t c u r r e n t v s . s u p p l y v o l t a g e s u p p l y v o l t a g e , v i n ( v ) vin input current, i vin (ma) c u r r e n t - l i m i t l e v e l ( p e a k c u r r e n t ) v s . j u n c t i o n t e m p e r a t u r e j u n c t i o n t e m p e r a t u r e , t j ( o c ) o u t p u t v o l t a g e v s . i n p u t v o l t a g e i n p u t v o l t a g e , v i n ( v ) o u t p u t c u r r e n t v s . e f f i c i e n c y o u t p u t v o l t a g e v s . o u t p u t c u r r e n t o u t p u t c u r r e n t , i o u t ( a ) o u t p u t c u r r e n t , i o u t ( a ) output voltage, v out (v) efficiency, (%) output voltage, v out (v) current limit level, i lim (a) reference voltage, v ref (v) j u n c t i o n t e m p e r a t u r e , t j ( o c ) r e f e r e n c e v o l t a g e v s . j u n c t i o n t e m p e r a t u r e 0.784 0.788 0.792 0.796 0.800 0.804 0.808 0.812 0.816 -50 -25 0 25 50 75 100 125 150 3.2 3.22 3.24 3.26 3.28 3.3 3.32 3.34 3.36 3.38 3.4 0 1 2 3 (refer to the application circuit 1 in the section ?typical application circuits?, v in =12v, v out =3.3v, l1=4.7 m h ) 0.0 0.5 1.0 1.5 2.0 0 2 4 6 8 10 12 14 v fb =0.85v 4.5 5 5.5 6 6.5 7 -40 -20 0 20 40 60 80 100 120 140 0 10 20 30 40 50 60 70 80 90 100 0.001 0.01 0.1 1 10 v in =5v, v out =3.3v, l1=2.2 m h v in =12v, v out =5v, l1=6.8 m h v in =12v, v out =3.3v, l1=4.7 m h 3.2 3.22 3.24 3.26 3.28 3.3 3.32 3.34 3.36 3.38 3.4 4 6 8 10 12 14 i out =500ma
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 1 - a p r . , 2 0 0 8 a p w 7 1 4 3 w w w . a n p e c . c o m . t w 6 t y p i c a l o p e r a t i n g c h a r a c t e r i s t i c s ( c o n t . ) o s c i l l a t o r f r e q u e n c y v s . j u n c t i o n t e m p e r a t u r e oscillator frequency, f osc (khz) j u n c t i o n t e m p e r a t u r e , t j ( o c ) o p e r a t i n g w a v e f o r m s p o w e r o n p o w e r o f f (refer to the application circuit 1 in the section ?typical application circuits?, v in =12v, v out =3.3v, l1=4.7 m h ) (refer to the application circuit 1 in the section ?typical application circuits?, v in =12v, v out =3.3v, l1=4.7 m h ) 450 460 470 480 490 500 510 520 530 540 550 -50 -25 0 25 50 75 100 125 150 ch1 : v in , 5v/div ch2 : v out , 2v/div time : 10ms/div ch3 : i l1 , 2a/div 1 2 3 v in v out i l1 i out =3a ch1 : v in , 5v/div ch2 : v out , 2v/div time : 5 ms/div 1 2 3 ch3 : i l1 , 2a/div v in v out i l1 i out =3a
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 1 - a p r . , 2 0 0 8 a p w 7 1 4 3 w w w . a n p e c . c o m . t w 7 o p e r a t i n g w a v e f o r m s ( c o n t . ) e n a b l e s h u t d o w n (refer to the application circuit 1 in the section ?typical application circuits?, v in =12v, v out =3.3v, l1=4.7 m h ) o v e r c u r r e n t s h o r t c i r c u i t ch1 : v en , 5v/div ch3 : i l1 , 2a/div time : 1 ms/div ch2 : v out , 2v/div 1 2 3 v en v out i l1 i out =3a v en v out i l1 ch1 : v en , 5v/div ch3 : i l1 , 2a/div time : 100 m s/div ch2 : v out , 2v/div 1 2 3 i out =3a 1 2 3 v lx v out i l1 ch1 : v lx , 5v/div ch2 : v out , 200mv/div ch3 : i l1 , 5a/div time : 5 m s/div v out is shorted to ground by a short wire ch1 : v lx , 10v/div ch2 : v out , 2v/div ch3 : i l1 , 5a/div time : 20 m s/div i out =3~7a v lx v out i l1 1 2 3
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 1 - a p r . , 2 0 0 8 a p w 7 1 4 3 w w w . a n p e c . c o m . t w 8 o p e r a t i n g w a v e f o r m s ( c o n t . ) l o a d t r a n s i e n t r e s p o n s e l o a d t r a n s i e n t r e s p o n s e (refer to the application circuit 1 in the section ?typical application circuits?, v in =12v, v out =3.3v, l1=4.7 m h ) s w i t c h i n g w a v e f o r m s w i t c h i n g w a v e f o r m v out i l1 ch1 : v out , 200mv/div ch2 : i l1 , 2a/div time : 100 m s/div 1 2 i out = 50ma-> 3a ->50ma i out rising/falling time=10 m s ch1 : v out , 100mv/div ch2 : i l1 , 2a/div time : 100 m s/div i l1 v out 1 2 i out = 0.5a-> 3a ->0.5a i out rising/falling time=10 m s ch1 : v lx , 5v/div ch2 : i l1 , 2a/div time : 1 m s/div i l1 v lx i out = 0.2a 1 2 ch1 : v lx , 5v/div ch2 : i l1 , 2a/div time : 1 m s/div v lx i l1 i out = 3a 1 2
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 1 - a p r . , 2 0 0 8 a p w 7 1 4 3 w w w . a n p e c . c o m . t w 9 o p e r a t i n g w a v e f o r m s ( c o n t . ) l i n e t r a n s i e n t (refer to the application circuit 1 in the section ?typical application circuits?, v in =12v, v out =3.3v, l1=4.7 m h ) v in v out i l1 ch1 : v in , 5v/div ch2 : v out , 50mv/div (voffset=3.3v) time : 100 m s/div 1 2 3 ch3 : i l1 , 2a/div v in = 5~12v v in rising/falling time=20 m s p i n d e s c r i p t i o n pin no. name function 1 vin power input. vin supplies the power (4 .3 v to 1 4 v) to the control circuitry, gate driver , and step - down converter switch. connecting a ceramic bypass capacitor and a suitably large capacitor between vin and agnd eliminates switc hing noise and voltage ripple on the input to the ic. 2 nc no connection. 3 agnd ground of mosfet gate driver and control circuitry. 4 fb output feedback input. the apw7143 senses the feedback voltage via fb and regulate s the voltage at 0.8v. connectin g fb with a resistor - divider from the converter?s output sets the output voltage from 0.8v to vin. 5 comp output of the error amplifier. connect a series rc network from comp to a gnd to compensate the regulation control loop. in some cases, an additional capacitor from comp to a gnd is required. 6 en enable input. en is a digital input that turns the regulator on or off. drive en high to turn on the regulator, drive it low to turn it off. connect this pin to vin if it is not used. 7, 8 lx power switching output. lx is the drain of the p - channel power mosfet to supply power to the output lc filter.
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 1 - a p r . , 2 0 0 8 a p w 7 1 4 3 w w w . a n p e c . c o m . t w 1 0 b l o c k d i a g r a m lx gate control v ref soft-start / soft-stop and fault logic error amplifier fb inhibit 50%v ref uvp agnd por power-on- reset enable current sense amplifier en comp oscillator 500khz slope compensation current compartor 1.5v vin over temperature protection current limit fb ug gate driver soft-start gm t y p i c a l a p p l i c a t i o n c i r c u i t s 1. +12v single power input step-down converter (with an electrolytic output capacitor) lx en 6 vin 2 agnd 3 comp 5 8 u1 apw7143 fb 4 v out 3.3v/3a l1 4.7 m h /3a v in 12v c1 2.2 m f lx 7 enable shutdown c2 470 m f (esr=30m w ) r1 46.9k ? 1% r2 15k ? 1% c4 47pf r3 62k c3 680pf c5 470 m f d1
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 1 - a p r . , 2 0 0 8 a p w 7 1 4 3 w w w . a n p e c . c o m . t w 1 1 t y p i c a l a p p l i c a t i o n c i r c u i t s ( c o n t . ) 2. 4.3~14v single power input step-down converter(with ceramic input/output capacitor) a. cost-effective feedback compensation (c4 is not connected) b. fast-transient-response feedback compensation (c4 is connected) v in (v) v out (v) l1( m h) c2( m f) c2 esr(m w ) c3(pf) 12 5 6.8 22 5 63.0 12 10.0 1500 12 5 6.8 44 3 63.0 12 20.0 1500 12 3.3 4.7 22 5 46.9 15 10.0 1500 12 3.3 4.7 44 3 46.9 15 22.0 1500 12 2 3.3 22 5 30.0 20 10.0 1500 12 2 3.3 44 3 30.0 20 20.0 1500 12 1.2 2.2 22 5 7.5 15 8.2 1800 12 1.2 2.2 44 3 7.5 15 16.0 1800 5 3.3 2.2 22 5 46.9 15 8.2 680 5 3.3 2.2 44 3 46.9 15 20.0 680 5 1.2 2.2 22 5 7.5 15 3.0 1800 5 1.2 2.2 44 3 7.5 15 7.5 1800 r1(k w ) r2(k w ) r3(k w ) r2 ? 1% lx en 6 vin 1 agnd 3 comp 5 8 u1 apw7143 fb 4 v out l1 d1 v in c1 c3 r3 c2 r1 ? 1% lx 7 enable shutdown c4 optional v in (v) v out (v) l1( m h) c2( m f) c2 esr(m w ) c4(pf) c3(pf) 12 5 6.8 22 5 63.0 12 47 33.0 470 12 5 6.8 44 3 63.0 12 47 68.0 470 12 3.3 4.7 22 5 46.9 15 47 22.0 680 12 3.3 4.7 44 3 46.9 15 47 47.0 680 12 2 3.3 22 5 30.0 20 47 13.0 1200 12 2 3.3 44 3 30.0 20 47 27.0 1200 12 1.2 2.2 22 5 7.5 15 150 7.5 2200 12 1.2 2.2 44 3 7.5 15 150 15.0 2200 5 3.3 2.2 22 5 46.9 15 56 20.0 220 5 3.3 2.2 44 3 46.9 15 56 43.0 220 5 1.2 2.2 22 5 7.5 15 330 3.3 1800 5 1.2 2.2 44 3 7.5 15 330 8.2 1500 r1(k w ) r2(k w ) r3(k w )
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 1 - a p r . , 2 0 0 8 a p w 7 1 4 3 w w w . a n p e c . c o m . t w 1 2 f u n c t i o n d e s c r i p t i o n v i n p o w e r - o n - r e s e t ( p o r ) t h e a p w 7 1 4 3 k e e p s m o n i t o r i n g t h e v o l t a g e o n v i n p i n t o p r e v e n t w r o n g l o g i c o p e r a t i o n s w h i c h m a y o c c u r w h e n v i n v o l t a g e i s n o t h i g h e n o u g h f o r t h e i n t e r n a l c o n t r o l c i r c u i t r y t o o p e r a t e . t h e v i n p o r h a s a r i s i n g t h r e s h o l d o f 4 . 1 v ( t y p i c a l ) w i t h 0 . 5 v o f h y s t e r e s i s . d u r i n g s t a r t - u p , t h e v i n v o l t a g e m u s t e x c e e d t h e e n a b l e v o l t a g e t h r e s h o l d . t h e n t h e i c s t a r t s a s t a r t - u p p r o c e s s a n d r a m p s u p t h e o u t p u t v o l t a g e t o t h e v o l t a g e t a r g e t . d i g i t a l s o f t - s t a r t t h e a p w 7 1 4 3 h a s a b u i l t - i n d i g i t a l s o f t - s t a r t t o c o n t r o l t h e r i s e r a t e o f t h e o u t p u t v o l t a g e a n d l i m i t t h e i n p u t c u r - r e n t s u r g e d u r i n g s t a r t - u p . d u r i n g s o f t - s t a r t , a n i n t e r n a l v o l t a g e r a m p ( v r a m p ) , c o n n e c t e d t o o n e o f t h e p o s i t i v e i n p u t s o f t h e e r r o r a m p l i f i e r , r i s e s u p f r o m 0 v t o 0 . 9 5 v t o r e p l a c e t h e r e f e r e n c e v o l t a g e ( 0 . 8 v ) u n t i l t h e v o l t a g e r a m p r e a c h e s t h e r e f e r e n c e v o l t a g e . o u t p u t u n d e r v o l t a g e p r o t e c t i o n ( u v p ) i n t h e p r o c e s s o f o p e r a t i o n , i f a s h o r t - c i r c u i t o c c u r s , t h e o u t p u t v o l t a g e w i l l d r o p q u i c k l y . b e f o r e t h e c u r r e n t - l i m i t c i r c u i t r e s p o n d s , t h e o u t p u t v o l t a g e w i l l f a l l o u t o f t h e r e - q u i r e d r e g u l a t i o n r a n g e . t h e u n d e r v o l t a g e c o n t i n u a l l y m o n i t o r s t h e f b v o l t a g e a f t e r s o f t - s t a r t i s c o m p l e t e d . i f a l o a d s t e p i s s t r o n g e n o u g h t o p u l l t h e o u t p u t v o l t a g e l o w e r t h a n t h e u n d e r v o l t a g e t h r e s h o l d , t h e i c s h u t s d o w n c o n v e r t e r ? s o u t p u t . t h e u n d e r v o l t a g e t h r e s h o l d i s 5 0 % o f t h e n o m i n a l o u t p u t v o l t a g e . t h e u n d e r v o l t a g e c o m p a r a t o r h a s a b u i l t - i n 2 s n o i s e f i l t e r t o p r e v e n t t h e c h i p s f r o m w r o n g u v p s h u t - d o w n c a u s e d b y n o i s e . t h e u n d e r v o l t a g e p r o t e c t i o n w o r k s i n a h i c c u p m o d e w i t h o u t l a t c h e d s h u t d o w n . t h e i c w i l l i n i t i a t e a n e w s o f t - s t a r t p r o c e s s a t t h e e n d o f t h e p r e c e d - i n g d e l a y . o v e r - t e m p e r a t u r e p r o t e c t i o n ( o t p ) t h e o v e r - t e m p e r a t u r e c i r c u i t l i m i t s t h e j u n c t i o n t e m p e r a - t u r e o f t h e a p w 7 1 4 3 . w h e n t h e j u n c t i o n t e m p e r a t u r e e x - c e e d s t j = + 1 5 0 o c , a t h e r m a l s e n s o r t u r n s o f f t h e p o w e r m o s f e t , a l l o w i n g t h e d e v i c e s t o c o o l . t h e t h e r m a l s e n - s o r a l l o w s t h e c o n v e r t e r s t o s t a r t a s t a r t - u p p r o c e s s a n d r e g u l a t e t h e o u t p u t v o l t a g e a g a i n a f t e r t h e j u n c t i o n t e m - p e r a t u r e c o o l s b y 4 0 o c . t h e o t p i s d e s i g n e d w i t h a 4 0 o c h y s t e r e s i s t o l o w e r t h e a v e r a g e t j d u r i n g c o n t i n u o u s t h e r - e n a b l e / s h u t d o w n d r i v i n g e n t o g r o u n d p l a c e s t h e a p w 7 1 4 3 i n s h u t d o w n . w h e n i n s h u t d o w n , t h e i n t e r n a l p - c h a n n e l p o w e r m o s f e t t u r n s o f f , a l l i n t e r n a l c i r c u i t r y s h u t s d o w n a n d t h e q u i e s - c e n t s u p p l y c u r r e n t r e d u c e s t o l e s s t h a n 3 m a . m a l o v e r l o a d c o n d i t i o n s , i n c r e a s i n g l i f e t i m e o f t h e a p w 7 1 4 3 . c u r r e n t - l i m i t p r o t e c t i o n t h e a p w 7 1 4 3 m o n i t o r s t h e o u t p u t c u r r e n t , f l o w s t h r o u g h t h e p - c h a n n e l p o w e r m o s f e t , a n d l i m i t s t h e c u r r e n t p e a k a t c u r r e n t - l i m i t l e v e l t o p r e v e n t l o a d s a n d t h e i c f r o m d a m - a g e s d u r i n g o v e r l o a d o r s h o r t - c i r c u i t c o n d i t i o n s . f r e q u e n c y f o l d b a c k t h e f o l d b a c k f r e q u e n c y i s c o n t r o l l e d b y t h e f b v o l t a g e . w h e n t h e o u t p u t i s s h o r t e d t o g r o u n d , t h e f r e q u e n c y o f t h e o s c i l l a t o r w i l l b e r e d u c e d t o a b o u t 8 0 k h z . t h i s l o w e r f r e q u e n c y a l l o w s t h e i n d u c t o r c u r r e n t t o d i s c h a r g e s a f e l y a n d t h e r e b y p r e v e n t c u r r e n t r u n a w a y . t h e o s c i l l a t o r ? s f r e - q u e n c y w i l l g r a d u a l l y i n c r e a s e t o i t s d e s i g n e d r a t e w h e n t h e f e e d b a c k v o l t a g e o n f b a g a i n a p p r o a c h e s 0 . 8 v .
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 1 - a p r . , 2 0 0 8 a p w 7 1 4 3 w w w . a n p e c . c o m . t w 1 3 a p p l i c a t i o n i n f o r m a t i o n (v) ) r2 r1 (1 0.8 v out + = s u g g e s t e d r 2 i s i n t h e r a n g e f r o m 1 k t o 2 0 k w . f o r p o r t a b l e a p p l i c a t i o n s , a 1 0 k w r e s i s t o r i s s u g g e s t e d f o r r 2 . t o p r e v e n t s t r a y p i c k u p , l o c a t e r e s i s t o r s r 1 a n d r 2 c l o s e t o a p w 7 1 4 3 . i n p u t c a p a c i t o r s e l e c t i o n e a c h t i m e , w h e n t h e p - c h a n n e l p o w e r m o s f e t ( q 1 ) t u r n s o n , s m a l l c e r a m i c c a p a c i t o r s f o r h i g h f r e q u e n c y d e c o u p l i n g a n d b u l k c a p a c i t o r s a r e r e q u i r e d t o s u p p l y t h e s u r g e c u r r e n t . t h e s m a l l c e r a m i c c a p a c i t o r s h a v e t o b e p l a c e d p h y s i - c a l l y c l o s e t o t h e v i n a n d b e t w e e n t h e v i n a n d t h e a n o d e o f t h e s c h o t t k y d i o d e ( d 1 ) . t h e i m p o r t a n t p a r a m e t e r s f o r t h e b u l k i n p u t c a p a c i t o r a r e t h e v o l t a g e r a t i n g a n d t h e r m s c u r r e n t r a t i n g . f o r r e l i a b l e o p e r a t i o n , s e l e c t t h e b u l k c a p a c i t o r w i t h v o l t a g e a n d c u r r e n t r a t i n g s a b o v e t h e m a x i m u m i n p u t v o l t a g e a n d l a r g e s t r m s c u r r e n t r e q u i r e d b y t h e c i r c u i t . t h e c a p a c i t o r v o l t a g e r a t i n g s h o u l d b e a t l e a s t 1 . 2 5 t i m e s g r e a t e r t h a n t h e m a x i m u m i n p u t v o l t a g e a n d a v o l t a g e r a t i n g o f 1 . 5 t i m e s i s a c o n s e r v a t i v e g u i d e l i n e . t h e r m s c u r r e n t ( i r m s ) o f t h e b u l k i n p u t c a p a c i t o r i s c a l c u l a t e d a s t h e f o l l o w i n g e q u a t i o n : (a) d) - (1 d i i out rms = w h e r e d i s t h e d u t y c y c l e o f t h e p o w e r m o s f e t . f o r a t h r o u g h h o l e d e s i g n , s e v e r a l e l e c t r o l y t i c c a p a c i t o r s m a y b e n e e d e d . f o r s u r f a c e m o u n t d e s i g n s , s o l i d t a n t a l u m c a p a c i t o r s c a n b e u s e d , b u t c a u t i o n m u s t b e e x e r c i s e d w i t h r e g a r d t o t h e c a p a c i t o r s u r g e c u r r e n t r a t i n g . v in v out c in c out l q1 lx esr i l i out i q1 i cout d1 vin f i g u r e 1 c o n v e r t e r w a v e f o r m s i out v lx t=1/f osc i l i q1 i cout i out i i dt v out v out o u t p u t c a p a c i t o r s e l e c t i o n a n o u t p u t c a p a c i t o r i s r e q u i r e d t o f i l t e r t h e o u t p u t a n d s u p p l y t h e l o a d t r a n s i e n t c u r r e n t . t h e f i l t e r i n g r e q u i r e m e n t s a r e t h e f u n c t i o n s o f t h e s w i t c h i n g f r e q u e n c y a n d t h e r i p p l e c u r r e n t ( d i ) . t h e o u t p u t r i p p l e i s t h e s u m o f t h e v o l t a g e s , h a v i n g p h a s e s h i f t , a c r o s s t h e e s r a n d t h e i d e a l o u t - p u t c a p a c i t o r . t h e p e a k - t o - p e a k v o l t a g e o f t h e e s r i s c a l c u l a t e d a s t h e f o l l o w i n g e q u a t i o n s : d in d out v v v v d + + = . . . . . . . . . . . ( 1 ) . . . . . . . . . . . ( 2 ) . . . . . . . . . . . ( 3 ) l f d) - (1 v i osc out = d (v) esr i v esr d = w h e r e v d i s t h e f o r w a r d v o l t a g e d r o p o f t h e d i o d e . t h e p e a k - t o - p e a k v o l t a g e o f t h e i d e a l o u t p u t c a p a c i t o r i s c a l c u l a t e d a s t h e f o l l o w i n g e q u a t i o n : s e t t i n g o u t p u t v o l t a g e t h e r e g u l a t e d o u t p u t v o l t a g e i s d e t e r m i n e d b y : (v) c f 8 i v out osc cout d = d . . . . . . . . . . . ( 4 ) f o r t h e a p p l i c a t i o n s , u s i n g b u l k c a p a c i t o r s , t h e d v c o u t i s m u c h s m a l l e r t h a n t h e v e s r a n d c a n b e i g n o r e d . t h e r e f o r e , t h e a c p e a k - t o - p e a k o u t p u t v o l t a g e ( d v o u t ) i s s h o w n b e l o w : (v) esr i v out d = d . . . . . . . . . . . ( 5 )
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 1 - a p r . , 2 0 0 8 a p w 7 1 4 3 w w w . a n p e c . c o m . t w 1 4 a p p l i c a t i o n i n f o r m a t i o n ( c o n t . ) o u t p u t c a p a c i t o r s e l e c t i o n ( c o n t . ) f o r t h e a p p l i c a t i o n s , u s i n g c e r a m i c c a p a c i t o r s , t h e v e s r i s m u c h s m a l l e r t h a n t h e d v c o u t a n d c a n b e i g n o r e d . t h e r e f o r e , t h e a c p e a k - t o - p e a k o u t p u t v o l t a g e ( d v o u t ) i s c l o s e t o d v c o u t . t h e l o a d t r a n s i e n t r e q u i r e m e n t s a r e t h e f u n c t i o n s o f t h e s l e w r a t e ( d i / d t ) a n d t h e m a g n i t u d e o f t h e t r a n s i e n t l o a d c u r r e n t . t h e s e r e q u i r e m e n t s g e n e r a l l y m e t w i t h a m i x o f c a p a c i t o r s a n d c a r e f u l l a y o u t . h i g h f r e q u e n c y c a p a c i - t o r s i n i t i a l l y s u p p l y t h e t r a n s i e n t a n d s l o w t h e c u r r e n t l o a d r a t e s e e n b y t h e b u l k c a p a c i t o r s . t h e b u l k f i l t e r c a - p a c i t o r v a l u e s a r e g e n e r a l l y d e t e r m i n e d b y t h e e s r ( e f f e c t i v e s e r i e s r e s i s t a n c e ) a n d v o l t a g e r a t i n g r e q u i r e - m e n t s r a t h e r t h a n a c t u a l c a p a c i t a n c e r e q u i r e m e n t s . h i g h f r e q u e n c y d e c o u p l i n g c a p a c i t o r s s h o u l d b e p l a c e d p h y s i c a l l y a s c l o s e t o t h e p o w e r p i n s o f t h e l o a d a s p o s s i b l e . b e c a r e f u l n o t t o a d d i n d u c t a n c e i n t h e c i r c u i t b o a r d w i r i n g t h a t c o u l d c a n c e l t h e u s e f u l n e s s o f t h e s e l o w i n d u c t a n c e c o m p o n e n t s . a n a l u m i n u m e l e c t r o l y t i c c a p a c i t o r ? s e s r v a l u e i s r e l a t e d t o t h e c a s e s i z e w i t h l o w e r e s r a v a i l a b l e i n l a r g e r c a s e s i z e s . h o w e v e r , t h e e q u i v a l e n t s e r i e s i n d u c t a n c e ( e s l ) o f t h e s e c a p a c i t o r s i n c r e a s e s w i t h c a s e s i z e a n d c a n r e d u c e t h e u s e f u l n e s s o f t h e c a p a c i t o r t o h i g h s l e w - r a t e t r a n s i e n t l o a d i n g . i n d u c t o r v a l u e c a l c u l a t i o n t h e o p e r a t i n g f r e q u e n c y a n d i n d u c t o r s e l e c t i o n a r e i n t e r r e l a t e d i n t h a t h i g h e r o p e r a t i n g f r e q u e n c i e s p e r m i t t h e u s e o f a s m a l l e r i n d u c t o r f o r t h e s a m e a m o u n t o f i n d u c t o r r i p p l e c u r r e n t . h o w e v e r , t h i s i s a t t h e e x p e n s e o f e f f i c i e n c y d u e t o a n i n c r e a s e i n m o s f e t g a t e c h a r g e l o s s e s . t h e e q u a t i o n ( 2 ) s h o w s t h a t t h e i n d u c t a n c e v a l u e h a s a d i r e c t e f f e c t o n r i p p l e c u r r e n t . a c c e p t i n g l a r g e r v a l u e s o f r i p p l e c u r r e n t a l l o w s t h e u s e o f l o w i n d u c t a n c e s , b u t r e s u l t s i n h i g h e r o u t p u t v o l t a g e r i p p l e a n d g r e a t e r c o r e l o s s e s . a r e a s o n a b l e s t a r t i n g p o i n t f o r s e t t i n g r i p p l e c u r r e n t i s d i 0 . 4 i o u t ( m a x ) . r e m e m b e r , t h e m a x i m u m r i p p l e c u r r e n t o c c u r s a t t h e m a x i m u m i n p u t v o l t a g e . t h e m i n i m u m i n d u c t a n c e o f t h e i n d u c t o r i s c a l c u l a t e d a s t h e f o l l o w i n g e q u a t i o n : . . . . . . . . . . . ( 6 ) in(max) in v v = o u t p u t d i o d e s e l e c t i o n t h e s c h o t t k y d i o d e c a r r i e s l o a d c u r r e n t d u r i n g t h e o f f - t i m e . t h e a v e r a g e d i o d e c u r r e n t i s t h e r e f o r e d e p e n d e n t o n t h e p - c h a n n e l p o w e r m o s f e t d u t y c y c l e . a t h i g h i n p u t v o l t a g e s t h e d i o d e c o n d u c t s m o s t o f t h e t i m e . a s v i n a p p r o a c h e s v o u t , t h e d i o d e c o n d u c t s o n l y a s m a l l f r a c t i o n o f t h e t i m e . t h e m o s t s t r e s s f u l c o n d i t i o n f o r t h e d i o d e i s w h e n t h e o u t p u t i s s h o r t - c i r c u i t e d . t h e r e f o r e , i t i s i m p o r t a n t t o a d e q u a t e l y s p e c i f y t h e d i o d e p e a k c u r r e n t a n d a v e r a g e p o w e r d i s s i p a t i o n s o a s n o t t o e x c e e d t h e d i o d e r a t i n g s . u n d e r n o r m a l l o a d c o n d i t i o n s , t h e a v e r a g e c u r r e n t c o n - d u c t e d b y t h e d i o d e i s : out d in out in d i v v v - v i + = t h e a p w 7 1 4 3 i s e q u i p p e d w i t h w h o l e p r o t e c t i o n s t o r e d u c e t h e p o w e r d i s s i p a t i o n d u r i n g s h o r t - c i r c u i t c o n d i t i o n . t h e r e f o r e , t h e m a x i m u m p o w e r d i s s i p a t i o n o f t h e d i o d e i s c a l c u l a t e d f r o m t h e m a x i m u m o u t p u t c u r r e n t a s : d(max) d diode(max) i v p = out(max) out i i = w h e r e w h e r e r e m e m b e r t o k e e p l e a d i n g l e n g t h s h o r t a n d o b s e r v i n g p r o p e r g r o u n d i n g t o a v o i d r i n g i n g a n d i n c r e a s i n g d i s s i p a t i o n . 1.2 v l 500000 ) v - (v v in out in out (h) v 600000 ) v - (v v l in out in out 3
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 1 - a p r . , 2 0 0 8 a p w 7 1 4 3 w w w . a n p e c . c o m . t w 1 5 l a y o u t c o n s i d e r a t i o n i n h i g h p o w e r s w i t c h i n g r e g u l a t o r , a c o r r e c t l a y o u t i s i m p o r t a n t t o e n s u r e p r o p e r o p e r a t i o n o f t h e r e g u l a t o r . i n g e n e r a l , i n t e r c o n n e c t i n g i m p e d a n c e s h o u l d b e m i n i m i z e d b y u s i n g s h o r t , w i d e p r i n t e d c i r c u i t t r a c e s . s i g n a l a n d p o w e r g r o u n d s a r e t o b e k e p t s e p a r a t e a n d f i n a l l y c o m b i n e d u s i n g g r o u n d p l a n e c o n s t r u c t i o n o r s i n g l e p o i n t g r o u n d i n g . f i g u r e 2 i l l u s t r a t e s t h e l a y o u t , w i t h b o l d l i n e s i n d i c a t i n g h i g h c u r r e n t p a t h s . c o m p o n e n t s a l o n g t h e b o l d l i n e s s h o u l d b e p l a c e d c l o s e t o g e t h e r . b e l o w i s a c h e c k l i s t f o r y o u r l a y o u t : 1 . b e g i n t h e l a y o u t b y p l a c i n g t h e p o w e r c o m p o n e n t s f i r s t . o r i e n t t h e p o w e r c i r c u i t r y t o a c h i e v e a c l e a n p o w e r f l o w p a t h . i f p o s s i b l e , m a k e a l l t h e c o n n e c t i o n s o n o n e s i d e o f t h e p c b w i t h w i d e , c o p p e r f i l l e d a r e a s . 2 . i n f i g u r e 2 , t h e l o o p s w i t h s a m e c o l o r b o l d l i n e s c o n d u c t h i g h s l e w r a t e c u r r e n t . t h e s e i n t e r c o n n e c t i n g i m p e d a n c e s s h o u l d b e m i n i m i z e d b y u s i n g w i d e a n d s h o r t p r i n t e d c i r c u i t t r a c e s . 3 . k e e p t h e s e n s i t i v e s m a l l s i g n a l n o d e s ( f b , c o m p ) a w a y f r o m s w i t c h i n g n o d e s ( l x o r o t h e r s ) o n t h e p c b . t h e r e f o r e , p l a c e t h e f e e d b a c k d i v i d e r a n d t h e f e e d - b a c k c o m p e n s a t i o n n e t w o r k c l o s e t o t h e i c t o a v o i d s w i t c h i n g n o i s e . c o n n e c t t h e g r o u n d o f f e e d b a c k d i v i d e r d i r e c t l y t o t h e a g n d p i n o f t h e i c u s i n g a d e d i c a t e d g r o u n d t r a c e . 4 . p l a c e t h e d e c o u p l i n g c e r a m i c c a p a c i t o r c 1 n e a r t h e v i n a s c l o s e a s p o s s i b l e . t h e b u l k c a p a c i t o r s c 5 a r e a l s o p l a c e d n e a r v i n . u s e a w i d e p o w e r g r o u n d p l a n e t o c o n n e c t t h e c 1 , c 2 , c 5 , a n d s c h o t t k y d i o d e t o p r o v i d e a l o w i m p e d a n c e p a t h b e t w e e n t h e c o m - p o n e n t s f o r l a r g e a n d h i g h s l e w r a t e c u r r e n t . f i g u r e 2 c u r r e n t p a t h d i a g r a m f i g u r e 3 r e c o m m e n d e d l a y o u t d i a g r a m lx en 6 vin 1 agnd 3 comp 5 8 u 1 apw 7143 fb 4 c 3 r 3 lx 7 l 1 c 2 load + v out - c 1 + v in - compensat ion network d1 r 1 r 2 feedback divider (optional) v out v lx s o p - 8 v in ground 4 3 2 1 l1 8 7 6 5 apw7143 d 1 c2 c1 ground
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 1 - a p r . , 2 0 0 8 a p w 7 1 4 3 w w w . a n p e c . c o m . t w 1 6 p a c k a g e i n f o r m a t i o n s o p - 8 s y m b o l min. max. 1.75 0.10 0.17 0.25 0.25 a a1 c d e e1 e h l millimeters b 0.31 0.51 sop-8 0.25 0.50 0.40 1.27 min. max. inches 0.069 0.004 0.012 0.020 0.007 0.010 0.010 0.020 0.016 0.050 0 0.010 1.27 bsc 0.050 bsc a2 1.25 0.049 0 8 0 8 d e e e 1 see view a c b h x 4 5 a a 1 a 2 l view a 0 . 2 5 seating plane gauge plane note: 1. follow jedec ms-012 aa. 2. dimension ? d ? does not include mold flash, protrusions or gate burrs. mold flash, protrusion or gate burrs shall not exceed 6 mil per side. 3. dimension ? e ? does not include inter-lead flash or protrusions. inter-lead flash and protrusions shall not exceed 10 mil per side. 3.80 5.80 4.80 4.00 6.20 5.00 0.189 0.197 0.228 0.244 0.150 0.157
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 1 - a p r . , 2 0 0 8 a p w 7 1 4 3 w w w . a n p e c . c o m . t w 1 7 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 p 0 p1 p 2 d 0 d1 t a 0 b 0 k 0 sop - 8(p) 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 6.40 ? 0.20 5.20 ? 0.20 2.10 ? 0.20 (mm) d e v i c e s p e r u n i t c a r r i e r t a p e & r e e l d i m e n s i o n s 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 package type unit quantity sop - 8 tape & reel 2500
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 1 - a p r . , 2 0 0 8 a p w 7 1 4 3 w w w . a n p e c . c o m . t w 1 8 test item method description solderability mil - std - 883d - 2003 245 c, 5 sec holt mil - std - 883d - 1005.7 1000 hrs bias @125 c pct jesd - 22 - b, a102 168 hrs, 100 % rh, 121 c tst mil - std - 883d - 1011.9 - 65 c~150 c, 200 cycles esd mil - std - 883d - 3015.7 vhbm > 2kv, vmm > 200v latch - up jesd 78 10ms, 1 tr > 100ma r e f l o w c o n d i t i o n ( i r / c o n v e c t i o n o r v p r r e f l o w ) c l a s s i f i c a t i o n r e f l o w p r o f i l e s profile feature sn - pb eutectic assembly pb - free assembly average ramp - up rate (t l to t p ) 3 c/second max. 3 c/second max. preheat - temperature min (tsmin) - temperature max (tsmax) - time (min to max) (ts) 100 c 150 c 60 - 120 seconds 150 c 200 c 60 - 180 seconds time maintained above: - temperature (t l ) - time (t l ) 183 c 60 - 150 seconds 217 c 60 - 150 seconds peak /classification temperature (tp) see table 1 see table 2 time within 5 c of actual peak temperature (tp) 10 - 30 seconds 20 - 40 seconds ramp - down rate 6 c/sec ond max. 6 c/second max. time 25 c to peak temperature 6 minutes max. 8 minutes max. notes: all temperatures refer to topside of the package. measured on the body surface. r e l i a b i l i t y t e s t p r o g r a m t 25 c to peak tp ramp-up t l ramp-down ts preheat tsmax tsmin t l t p 25 t e m p e r a t u r e time critical zone t l to t p
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 1 - a p r . , 2 0 0 8 a p w 7 1 4 3 w w w . a n p e c . c o m . t w 1 9 table 2. pb - free process ? package classification reflow temperatures package thickness volume mm 3 <350 volume mm 3 350 - 2000 volume mm 3 >2000 <1.6 mm 260 +0 c* 260 +0 c* 260 +0 c* 1.6 mm ? 2.5 mm 260 +0 c* 250 +0 c* 245 +0 c* 3 2.5 mm 250 +0 c* 245 +0 c* 245 +0 c* *tolerance: the device manufacturer/supplier shall assure 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. table 1. snpb eutectic process ? package peak reflow temperature s package thickness volume mm 3 <350 volume mm 3 3 350 <2.5 mm 240 +0/ - 5 c 225 +0/ - 5 c 3 2.5 mm 225 +0/ - 5 c 225 +0/ - 5 c c l a s s i f i c a t i o n r e f l o w p r o f i l e s ( c o n t . ) c u s t o m e r s e r v i c e a n p e c e l e c t r o n i c s c o r p . head office : no.6, dusing 1st road, sbip, hsin-chu, taiwan tel : 886-3-5642000 fax : 886-3-5642050 t a i p e i b r a n c h : 2 f , n o . 1 1 , l a n e 2 1 8 , s e c 2 j h o n g s i n g r d . , s i n d i a n c i t y , t a i p e i c o u n t y 2 3 1 4 6 , t a i w a n t e l : 8 8 6 - 2 - 2 9 1 0 - 3 8 3 8 f a x : 8 8 6 - 2 - 2 9 1 7 - 3 8 3 8

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