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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 . 8 - s e p . , 2 0 1 3 a p w 7 2 0 9 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 . 1 m h z , h i g h - e f f i c i e n c y , s t e p - u p c o n v e r t e r f o r 2 t o 1 0 w h i t e l e d s t h e a p w 7 2 0 9 i s a c u r r e n t - m o d e a n d f i x e d f r e q u e n c y b o o s t c o n v e r t e r w i t h a n i n t e g r a t e d n - f e t t o d r i v e u p t o 1 0 w h i t e l e d s i n s e r i e s . f e a t u r e s 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 <1 a quiescent current during shutdown sot-23-6 and tsot-23-6a package lead free and green devices available (rohs compliant) a p p l i c a t i o n s g e n e r a l d e s c r i p t i o n white led display backlighting cell phone and smart phone pda, pmp, mp3 digital camera s i m p l i f i e d a p p l i c a t i o n c i r c u i t p i n c o n f i g u r a t i o n t h e s e r i e s c o n n e c t i o n a l l o w s t h e l e d c u r r e n t t o b e i d e n - t i c a l f o r u n i f o r m b r i g h t n e s s . i t s l o w o n - r e s i s t a n c e o f n - f e t a n d l o w f e e d b a c k v o l t a g e r e d u c e p o w e r l o s s a n d a c h i e v e h i g h e f f i c i e n c y . f a s t s w i t c h i n g f r e q u e n c y ( 1 m h z t y p i c a l ) a l l o w s u s i n g s m a l l - s i z e i n d u c t o r a n d b o t h o f i n - p u t a n d o u t p u t c a p a c i t o r s . a n o v e r - v o l t a g e p r o t e c t i o n f u n c t i o n , w h i c h m o n i t o r s t h e o u t p u t v o l t a g e v i a o v p p i n , s t o p s s w i t c h i n g o f t h e i c i f t h e o v p v o l t a g e e x c e e d s t h e o v e r v o l t a g e t h r e s h o l d . a n i n t e r n a l s o f t - s t a r t c i r c u i t e l i m i - n a t e s t h e i n r u s h c u r r e n t d u r i n g s t a r t - u p . t h e a p w 7 2 0 9 a l s o i n t e g r a t e s u n d e r - v o l t a g e l o c k o u t , 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 , a n d c u r r e n t l i m i t c i r c u i t s t o p r o - t e c t t h e i c i n a b n o r m a l c o n d i t i o n s . t h e a p w 7 2 0 9 i s a v a i l - a b l e i n a s o t - 2 3 - 6 a n d t s o t - 2 3 - 6 p a c k a g e . gnd vin v out en lx fb ovp 4 6 5 3 2 1 c2 1 m f c1 4.7 m f r1 15 w v in up to 10 wleds off on apw7209 l1 22 m h 4 en 6 vin gnd 2 5 ovp fb 3 lx 1 sot - 23 - 6 / tsot - 23 - 6 ( top view )
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 . 8 - s e p . , 2 0 1 3 a p w 7 2 0 9 w w w . a n p e c . c o m . t w 2 symbol parameter rating unit v in vin supply voltage (vin to gnd) - 0.3 ~ 7 v fb, en to gnd voltage - 0.3 ~ v in v v lx lx to gnd voltage - 0.3 ~ 42 v v ovp ovp to gnd voltage - 0.3 ~ 42 v t j maximum junction temperature 150 c t stg storage temperatur e - 65 ~ 150 c t s dr maximum lead soldering temperature , 10 seconds 260 c 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 1 ) t h e r m a l c h a r a c t e r i s t i c s ( n o t e 2 ) symbol parameter typical value unit q ja junction to ambient t hermal r esistance . sot - 23 - 6 t sot - 23 - 6a 250 220 c /w note 2 : q ja is measured with the component mounted on a high effective thermal conductivity test board in free air. 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 ( n o t e 3 ) symbol parameter range unit v in vin input voltage 2.5~ 6 v v out converter output voltage up to 37 v c in input capacitor 4.7 or higher m f c out output capacitor 0.68 or higher m f l1 inductor 6.8 ~ 47 m h t a ambient temperature - 40 ~ 85 c t j junctio n temperature - 40 ~ 125 c note 3: refer to the application circuit for further information. 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 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 d 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 ) . n o t e 1 : s t r e s s e s b e y o n d t h o s e l i s t e d u n d e r " 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 s e a r e s t r e s s r a t i n g s o n l y a n d f u n c t i o n a l o p e r a t i o n o f t h e d e v i c e a t t h e s e o r a n y o t h e r c o n d i t i o n s b e y o n d t h o s e i n d i c a t e d u n d e r " 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 " i s n o t i m p l i e d . e x p o s u r e t o a b s o l u t e m a x i m u m r a t i n g c o n d i t i o n s f o r e x t e n d e d p e r i o d s m a y a f f e c t d e v i c e r e l i a b i l i t y . apw 7209 c : x - date code package code c : sot - 23 - 6 c t : t sot - 23 - 6 a operating ambient temperature range i : - 40 to 85 o c handling code tr : tape & reel assembly material g : halogen and lead free device w 09 x apw 7209 handling code temperature range package code assembly material apw 7209 c t : x - date code w 09 x
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 . 8 - s e p . , 2 0 1 3 a p w 7 2 0 9 w w w . a n p e c . c o m . t w 3 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 apw7 209 symbol parameter test condition s min. typ. max. unit supply voltage and current v in input voltage range t a = - 40 ~ 85 c , t j = - 40 ~ 125 c 2.5 - 6 v i dd1 v fb = 0.4v, no switching 70 100 130 a i dd2 fb = gnd, swit ching - 1 2 m a i sd input dc bias current en = gnd - - 1 a under voltage lockout uvlo threshold voltage v in rising 2.0 2.2 2.4 v uvlo hysteresis voltage 50 100 150 mv reference and output voltages t a = 25 c 0.285 0.3 0.315 v ref regulated feedback voltage t a = - 4 0 ~ 85 c (t j = - 40 ~ 125 c ) 0.276 - 0.324 v i fb fb input current - 50 - 50 n a internal power switch f sw switching frequency fb= gnd 0.8 1.0 1.2 mhz r on power switch on resistance - 0.6 - w i lim power switch current limit 0.7 1.0 1.4 a lx leakage cur rent v en =0v, v lx =0v or 5v, v i n = 5v - 1 - 1 a d max lx maximum duty cycle 92 95 98 % output over - voltage protection v ovp over voltage threshold v ovp rising 38 40 43 v ovp hysteresis - 3 - v ovp leakage current v ovp =40v - 50 - a enable and shutdo wn v ten en voltage threshold v e n rising 0.4 0.7 1 v en voltage hysteresis - 0.1 - v i len en leakage current v en = 0~ 5v, v i n = 5v - 1 - 1 a over - temperature protection t otp over - temperature protection (note 4) t j rising - 150 - c over - temperature p rotection hysteresis (note 4) - 40 - c note 4: guaranteed by design, not production tested. ( r e f e r t o f i g u r e 1 i n t h e ? 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 ? . t h e s e s p e c i f i c a t i o n s a p p l y o v e r v i n = 3 . 6 v , t a = - 4 0 c t o 8 5 c , u n l e s s o t h e r w i s e n o t e d . t y p i c a l v a l u e s a r e a t t a = 2 5 c . )
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 . 8 - s e p . , 2 0 1 3 a p w 7 2 0 9 w w w . a n p e c . c o m . t w 4 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 efficiency vs. wled current wled current vs. pwm duty cycle wled current vs. supply voltage maximum duty cycle vs. supply voltage switch on resistance vs. supply voltage switching frequency vs. supply voltage ( r e f e r t o f i g u r e 1 i n t h e s e c t i o n ? 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 ? , v i n = 3 . 6 v , t a = 2 5 o c , 1 0 w l e d s u n l e s s o t h e r w i s e s p e c i f i e d ) w l e d c u r r e n t , i l e d ( m a ) supply voltage, v in (v) 19.0 19.2 19.4 19.6 19.8 20.0 20.2 20.4 20.6 20.8 21.0 2.5 3 3.5 4 4.5 5 5.5 6 m a x i m u m d u t y c y c l e , d m a x ( % ) supply voltage, v in (v) 40 50 60 70 80 90 100 2.5 3 3.5 4 4.5 5 5.5 6 s w i t c h i n g f r e q u e n c y , f s w ( m h z ) supply voltage, v in (v) 2.5 3 3.5 4 4.5 5 5.5 6 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 s w i t c h o n r e s i s t a n c e , r o n ( [ ) supply voltage, v in (v) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 2.5 3 3.5 4 4.5 5 5.5 6 e f f i c i e n c y ( h ) wled current, i led (ma) 50 55 60 65 70 75 80 85 90 95 0 5 10 15 20 25 30 v in =3.6v v in =4.2v v in =5v v in =3.3v 10 wleds 33v@20ma h= p out /p in @ w l e d c u r r e n t , i l e d ( m a ) pwm duty cycle (%) 0 20 40 60 80 100 0 2 4 6 8 10 12 14 16 18 20 100hz 100khz 1khz
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 . 8 - s e p . , 2 0 1 3 a p w 7 2 0 9 w w w . a n p e c . c o m . t w 5 o p e r a t i n g w a v e f o r m s ( r e f e r t o t h e a p p l i c a t i o n c i r c u i t i n t h e s e c t i o n ? 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 ? , v i n = 3 . 6 v , t a = 2 5 o c , 1 0 w l e d s u n l e s s o t h e r w i s e s p e c i f i e d ) open-led protection ch1: v out , 10v/div, dc time: 20ms/div 1 v out , 10v/div start-up ch1: v en , 1v/div, dc ch2: v out , 10v/div, dc ch3: i in , 0.2a/div, dc time: 0.5ms/div v out , 10v/div i in , 0.2a/div v en 10wleds, l=22 h, v in =3.6v, i led =20ma 1 2 3 normal operating waveform 1 2 3 v lx , 20v/div, dc v out , 100mv/div, ac i l , 0.2a/div 10wleds, l=22 h, v in =3.6v, i led =20ma ch1: v lx , 20v/div, dc ch2: v out , 100mv/div, ac ch3: i l , 0.2a/div, dc time: 500n s/div
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 . 8 - s e p . , 2 0 1 3 a p w 7 2 0 9 w w w . a n p e c . c o m . t w 6 p i n d e s c r i p t i o n p in n o . n ame f unction 1 lx switch pin . connect this pin to inductor/diode here. 2 gnd power and signal ground pin. 3 fb feedback pin . reference voltage is 0.3v(typical). connect this pin to cathode of the lowest led and current - sense resistor (r1). c alculate resistor value according to r1=0.3v/i led . 4 en enable control i nput. forcing this pin above 1. 0 v enables the device, or f orcing this pin below 0. 4 v to shut it down. in shutdown, all f unctions are disabled to decrease the supply current below 1 a. do not leave this pin floating. 5 ovp over voltage protection input pin. ovp is connected to the output capacitor of the converter. 6 vin main s upply pin. must be closely decoupled to gnd with a 4.7 f or greater ceramic capacitor. b l o c k d i a g r a m uvlo oscillator control logic s vin en fb gnd lx ovp over- temperature protection v ref 0.3v eamp comp i cmp slope compensation gate driver current sense amplifier error amplifier current limit soft- start
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 . 8 - s e p . , 2 0 1 3 a p w 7 2 0 9 w w w . a n p e c . c o m . t w 7 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 figure 2 . brightness control by using a pwm signal applied to en figure 1 . typical 10 wleds application gnd vin v out en lx fb ovp 4 6 5 3 2 1 c 2 1 f c 1 4 . 7 f r 1 15 w v in up to 10 wleds 100 hz ~ 2 00 khz duty = 100 % , i led = 20 ma duty = 0 % , led off apw 7209 gnd vin v out en lx fb ovp 4 6 5 3 2 1 c 2 1 f c 1 4 . 7 f r 1 15 w v in up to 10 wleds off on apw 7209 l 1 22 h gnd vin v out en lx fb ovp 4 6 5 3 2 1 c 2 1 f c 1 4 . 7 f r 1 15 w r 2 10 k r 3 100 k c 3 0 . 1 f r 4 10 k v in up to 10 wleds off on apw 7209 max , led ref min , led min , adj min , led ref max , led max , adj max , adj min , led min , adj max , led ref i v i v i v i v v 3 r i v 3 r i v 2 r - - + - - + = max , led min , adj ref i v 3 r 2 r 3 r 2 r 1 v 1 r - ? ? ? ? + = v adj pwm brightness control 3 . 3 v 0 v figure 3 . brightness control using a filtered pwm signal l 1 22 h l 1 22 h duty = 100 % , led off duty = 0 % , i led = 22 ma
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 . 8 - s e p . , 2 0 1 3 a p w 7 2 0 9 w w w . a n p e c . c o m . t w 8 f u n c t i o n d e s c r i p t i o n m a i n c o n t r o l l o o p t h e a p w 7 2 0 9 i s a c o n s t a n t f r e q u e n c y c u r r e n t - m o d e s w i t c h i n g r e g u l a t o r . d u r i n g n o r m a l o p e r a t i o n , t h e i n t e r - n a l n - c h a n n e l p o w e r m o s f e t i s t u r n e d o n e a c h c y c l e w h e n t h e o s c i l l a t o r s e t s a n i n t e r n a l r s l a t c h a n d t u r n e d o f f w h e n a n i n t e r n a l c o m p a r a t o r ( i c m p ) r e s e t s t h e l a t c h . t h e p e a k i n d u c t o r c u r r e n t a t w h i c h i c m p r e s e t s t h e r s l a t c h i s c o n t r o l l e d b y t h e v o l t a g e o n t h e c o m p n o d e , w h i c h i s t h e o u t p u t o f t h e e r r o r a m p l i f i e r ( e a m p ) . a n e x t e r n a l c u r r e n t - s e n s e r e s i s t o r c o n n e c t e d b e t w e e n c a t h o d e o f t h e l o w e s t l e d a n d g r o u n d a l l o w s t h e e a m p t o r e c e i v e a c u r r e n t f e e d b a c k v o l t a g e v f b a t f b p i n . w h e n t h e l e d s v o l t a g e i n c r e a s e s t o c a u s e t h e l e d s c u r r e n t t o d e c r e a s e , i t c a u s e s a s l i g h t l y d e c r e a s e i n v f b r e l a t i v e t o t h e 0 . 3 v r e f e r e n c e , w h i c h i n t u r n c a u s e s t h e c o m p v o l t a g e t o i n - c r e a s e u n t i l t h e l e d s c u r r e n t r e a c h e s t h e s e t p o i n t . v i n u n d e r - v o l t a g e l o c k o u t ( u v l o ) t h e u n d e r - v o l t a g e l o c k o u t ( u v l o ) c i r c u i t c o m p a r e s t h e i n p u t v o l t a g e a t v i n w i t h t h e u v l o t h r e s h o l d ( 2 . 2 v r i s i n g , t y p i c a l ) t o e n s u r e t h e i n p u t v o l t a g e i s h i g h e n o u g h f o r r e l i a b l e o p e r a t i o n . t h e 1 0 0 m v ( t y p ) h y s t e r e s i s p r e v e n t s s u p p l y t r a n s i e n t s f r o m c a u s i n g a r e s t a r t . o n c e t h e i n p u t v o l t a g e e x c e e d s t h e u v l o r i s i n g t h r e s h o l d , s t a r t u p b e g i n s . w h e n t h e i n p u t v o l t a g e f a l l s b e l o w t h e u v l o f a l l i n g t h r e s h o l d , t h e c o n t r o l l e r t u r n s o f f t h e c o n v e r t e r . s o f t - s t a r t t h e a p w 7 2 0 9 h a s a b u i l t - i n s o f t - s t a r t t o c o n t r o l t h e n - c h a n n e l m o s f e t c u r r e n t r i s 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 r a m p v o l t a g e , c o n n e c t e d t o o n e o f t h e i n v e r t i n g i n p u t s o f t h e c o m o a r a t o r i c m p , r a i s e u p t o r e - p l a c e t h e o u t p u t v o l t a g e o f e r r o r a m p l i f i e r u n t i l t h e r a m p v o l t a g e r e a c h e s t h e v c o m p . 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 2 0 9 m o n i t o r s t h e i n d u c t o r c u r r e n t , f l o w i n g t h r o u g h t h e n - c h a n n e l 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 a p w 7 2 0 9 f r o m d a m a g e s i n o v e r l o a d c o n d i t i o n s . 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 2 0 9 . 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 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 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 t o s t a r t a s o f t - s t a r t p r o c e s s a n d r e g u l a t e t h e l e d s c u r r e n t 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 j u n c t i o n t e m p e r a t u r e ( t j ) d u r i n g c o n t i n u o u s t h e r 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 t h e l i f e t i m e o f t h e d e v i c e . 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 2 0 9 i n s h u t d o w n m o d e . 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 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 n e t s u p p l y c u r r e n t r e d u c e s t o 1 m a m a x i m u m . o p e n - l e d p r o t e c t i o n i n d r i v i n g l e d a p p l i c a t i o n s , t h e f e e d b a c k v o l t a g e o n f b p i n f a l l s d o w n i f o n e o f t h e l e d s , i n s e r i e s , i s f a i l e d . m e a n w h i l e , t h e c o n v e r t e r u n c e a s i n g l y b o o s t s t h e o u t p u t v o l t a g e l i k e a o p e n - l o o p o p e r a t i o n . t h e r e f o r e , a n o v e r - v o l t a g e p r o t e c t i o n ( o v p ) , m o n i t o r i n g t h e o u t p u t v o l t a g e v i a o v p p i n , i s i n t e g r a t e d i n t o t h e c h i p t o p r e v e n t t h e l x a n d t h e o u t p u t v o l t a g e s f r o m e x c e e d i n g t h e i r m a x i m u m v o l t a g e r a t i n g s . w h e n t h e v o l t a g e o n t h e o v p p i n r i s e s a b o v e t h e o v p t h r e s h o l d ( 4 0 v , t y p i c a l ) , t h e c o n v e r t e r s t o p s s w i t c h i n g a n d p r e v e n t s t h e o u t p u t v o l t a g e f r o m r i s i n g . t h e c o n v e r t e r c a n w o r k a g a i n w h e n t h e f a l l i n g o v p v o l t a g e f a l l s b e l o w t h e o v p v o l t a g e t h r e s h o l d . this pin also could be used as a digital input allowing brightness controlled by using a pwm signal with fre- quency from 100hz to 200khz. the 0% duty cycle of pwm signal corresponds to zero leds current and 100% cor- responds to full one.
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 . 8 - s e p . , 2 0 1 3 a p w 7 2 0 9 w w w . a n p e c . c o m . t w 9 a p p l i c a t i o n i n f o r m a t i o n i n p u t c a p a c i t o r s e l e c t i o n t h e i n p u t c a p a c i t o r ( c i n ) r e d u c e s t h e r i p p l e o f t h e i n p u t c u r r e n t d r a w n f r o m t h e i n p u t s u p p l y a n d r e d u c e s n o i s e i n j e c t i o n i n t o t h e i c . t h e r e f l e c t e d r i p p l e v o l t a g e w i l l b e s m a l l e r w h e n a n i n p u t c a p a c i t o r w i t h l a r g e r c a p a c i t a n c e i s u s e d . f o r r e l i a b l e o p e r a t i o n , i t i s r e c o m m e n d e d t o s e l e c t t h e c a p a c i t o r w i t h m a x i m u m v o l t a g e r a t i n g a t l e a s t 1 . 2 t i m e s o f 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 c a p a c i t o r s s h o u l d b e p l a c e d c l o s e t o t h e v i n a n d g n d . i n d u c t o r s e l e c t i o n selecting an inductor with low dc resistance reduces con- duction losses and achieves high efficiency. t h e e f f i c i e n c y i s m o d e r a t e d w h i l s t u s i n g s m a l l c h i p i n d u c t o r which op- erates with h i g h e r i n d u c t o r c o r e l o s s e s . t h e r e f o r e , i t i s n e c e s s a r y t o t a k e f u r t h e r c o n s i d e r a t i o n w h i l e c h o o s i n g a n a d e q u a t e i n d u c t o r . m a i n l y , t h e i n d u c t o r v a l u e d e t e r - m i n e s t h e i n d u c t o r r i p p l e c u r r e n t : l a r g e r i n d u c t o r v a l u e r e s u l t s i n s m a l l e r i n d u c t o r r i p p l e c u r r e n t a n d l o w e r c o n - d u c t i o n l o s s e s o f t h e c o n v e r t e r . h o w e v e r , l a r g e r i n d u c t o r v a l u e g e n e r a t e s s l o w e r l o a d t r a n s i e n t r e s p o n s e . a rea- sonable design rule is to set the ripple current, d i l , to be 30% to 50% of the maximum average inductor current, i l (avg) . the inductor value can be obtained as below, w h e r e v i n = i n p u t v o l t a g e v o u t = o u t p u t v o l t a g e f s w = s w i t c h i n g f r e q u e n c y i n m h z i o u t = m a x i m u m o u t p u t c u r r e n t i n a m p . b = e f f i c i e n c y d i l / i l ( a v g ) = i n d u c t o r r i p p l e c u r r e n t / a v e r a g e c u r r e n t ( 0 . 3 t o 0 . 5 t y p i c a l ) t o a v o i d s a t u r a t i o n o f t h e i n d u c t o r , t h e i n d u c t o r s h o u l d b e r a t e d a t l e a s t f o r t h e m a x i m u m i n p u t c u r r e n t o f t h e c o n - v e r t e r p l u s t h e i n d u c t o r r i p p l e c u r r e n t . t h e m a x i m u m i n - p u t c u r r e n t i s c a l c u l a t e d a s b e l o w : t h e p e a k i n d u c t o r c u r r e n t 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 : ( ) sw out in out in ) max ( in peak f l v v v v 2 1 i i - + = o u t p u t c a p a c i t o r s e l e c t i o n t h e c u r r e n t - m o d e c o n t r o l s c h e m e o f t h e a p w 7 2 0 9 a l - l o w s t h e u s a g e o f t i n y c e r a m i c c a p a c i t o r s . t h e h i g h e r c a p a c i t o r v a l u e p r o v i d e s g o o d l o a d t r a n s i e n t r e s p o n s e . c e r a m i c c a p a c i t o r s w i t h l o w e s r v a l u e s h a v e t h e l o w e s t o u t p u t v o l t a g e r i p p l e a n d a r e r e c o m m e n d e d . i f r e q u i r e d , t a n t a l u m c a p a c i t o r s m a y b e u s e d a s w e l l . 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 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 . w h e r e i p e a k i s t h e p e a k i n d u c t o r c u r r e n t . g v o u t = g v e s r + g v c o u t v in v ou t i l n-fet lx i ou t i sw c in c ou t i in d1 esr i lim i l i peak i in i out i sw i d d i l ( ) ? ? ? ? ? d h - ? ? ? ? ? 3 avg l l ) max ( out sw in out 2 out in i i i f v v v v l ? ? ? ? ? - ? d sw out in out out out cout f v v v c i v h = in out ) max ( out ) max ( in v v i i esr peak esr r i v ? d
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 . 8 - s e p . , 2 0 1 3 a p w 7 2 0 9 w w w . a n p e c . c o m . t w 1 0 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 c e r a m i c c a p a c i t o r a p p l i c a t i o n , t h e o u t p u t v o l t a g e r i p p l e i s d o m i n a t e d b y t h e d v c o u t . w h e n c h o o s i n g t h e i n p u t a n d o u t p u t c e r a m i c c a p a c i t o r s , t h e x 5 r o r x 7 r w i t h t h e i r g o o d t e m p e r a t u r e a n d v o l t a g e c h a r a c t e r i s t i c s a r e r e c o m m e n d e d . d i o d e s e l e c t i o n t o a c h i e v e h i g h e f f i c i e n c y , a s c h o t t k y d i o d e m u s t b e u s e d . t h e c u r r e n t r a t i n g o f t h e d i o d e m u s t m e e t t h e p e a k c u r - r e n t r a t i n g o f t h e c o n v e r t e r . s e t t i n g t h e l e d c u r r e n t i n f i g u r e 1 , t h e c o n v e r t e r r e g u l a t e s t h e v o l t a g e o n f b p i n , c o n n e c t e d w i t h t h e c a t h o d o f t h e l o w e s t l e d a n d t h e c u r - r e n t - s e n s e r e s i s t o r r 1 , a t 0 . 3 v ( t y p i c a l ) . t h e r e f o r e , t h e c u r r e n t ( i l e d ) , f l o w i n g v i a t h e l e d s a n d t h e r 1 , i s c a l c u - l a t e d b y t h e f o l l o w i n g e q u a t i o n : recommended inductor selection designator manufacturer part number i nductance (h) max dcr ( ohm ) saturation current (a) dimensions l x w x h (mm 3 ) l1 gotrend gtsd - 53 - 470 47 0.35 0.62 5 x 5 x 2.8 l1 gotrend gtsd - 32 - 220 22 0.59 0.52 3.85 x 3.85 x 1.8 reco mmended capacitor selection designator manufacturer part number capacitance ( f) tc code rated voltage (v) case size c1 murata grm188 r60j475ke19 4.7 x5r 6.3 0603 c2 murata grm21br71h105ka12 1.0 x7r 50 0805 recommended diode selection designator manufact urer part number maximum average forward rectified current ( a) maximum repetitive peak reverse voltage (v) case size d1 zowie mscd106 1.0 60 0805 l a y o u t c o n s i d e r a t i o n f o r a l l s w i t c h i n g p o w e r s u p p l i e s , t h e l a y o u t i s a n i m p o r - t a n t s t e p i n t h e d e s i g n ; e s p e c i a l l y a t h i g h p e a k c u r r e n t s a n d s w i t c h i n g f r e q u e n c i e s . i f t h e l a y o u t i s n o t c a r e f u l l y d o n e , t h e r e g u l a t o r m i g h t s h o w n o i s e p r o b l e m s a n d d u t y c y c l e j i t t e r . 1 . t h e i n p u t c a p a c i t o r s h o u l d b e p l a c e d c l o s e t o t h e v i n a n d g n d . c o n n e c t i n g t h e c a p a c i t o r w i t h v i n a n d g n d p i n s b y s h o r t a n d w i d e t r a c k s w i t h o u t u s i n g a n y v i a s f o r f i l t e r i n g a n d m i n i m i z i n g t h e i n p u t v o l t a g e r i p p l e . 2 . t h e i n d u c t o r s h o u l d b e p l a c e d a s c l o s e a s p o s s i b l e t o t h e l x p i n t o m i n i m i z e l e n g t h o f t h e c o p p e r t r a c k s a s w e l l a s t h e n o i s e c o u p l i n g i n t o o t h e r c i r c u i t s . 3 . s i n c e t h e f e e d b a c k p i n a n d n e t w o r k i s a h i g h i m p e d - a n c e c i r c u i t , t h e f e e d b a c k n e t w o r k s h o u l d b e r o u t e d a w a y f r o m t h e i n d u c t o r . t h e f e e d b a c k p i n a n d f e e d - b a c k n e t w o r k s h o u l d b e s h i e l d e d w i t h a g r o u n d p l a n e o r t r a c k t o m i n i m i z e n o i s e c o u p l i n g i n t o t h i s c i r c u i t . 4 . a s t a r g r o u n d c o n n e c t i o n o r g r o u n d p l a n e m i n i m i z e s g r o u n d s h i f t s a n d n o i s e i s r e c o m m e n d e d . to anode of wleds from cathod of wleds via to ovp l1 c1 via to v out d1 v en v in lx refer to fig. 1 optimized apw7209 layout r 1 c 2 v out 1 r v 3 . 0 i led =
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 . 8 - s e p . , 2 0 1 3 a p w 7 2 0 9 w w w . a n p e c . c o m . t w 1 1 p a c k a g e i n f o r m a t i o n s o t - 2 3 - 6 0 l view a 0 . 2 5 gauge plane seating plane a a 2 a 1 e d e 1 see view a b c e1 e 0 8 0 8 0.020 0.009 0.006 0.024 0.051 0.057 max. 0.30 l 0 e e e1 e1 d c b 0.08 0.30 0.012 0.60 0.95 bsc 1.90 bsc 0.50 0.22 0.075 bsc 0.037 bsc 0.012 0.003 millimeters min. s y m b o l a1 a2 a 0.00 0.90 sot-23-6 max. 1.30 0.15 1.45 min. 0.000 0.035 inches 1.40 2.60 3.00 1.80 2.70 3.10 0.118 0.071 0.122 0.102 0.055 0.106 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.
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 . 8 - s e p . , 2 0 1 3 a p w 7 2 0 9 w w w . a n p e c . c o m . t w 1 2 p a c k a g e i n f o r m a t i o n t s o t - 2 3 - 6 a 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. d e e1 b e 1 e c see view a a 2 a 1 a view a l 0 . 2 5 seating plane gauge plane 0.020 0.008 0.004 0.024 0.035 0.039 max. 0.30 l 0 0 e e e1 e1 d c b 0.08 0.30 0.012 0.60 8 0 8 0.95 bsc 1.90 bsc 0.50 0.20 0.075 bsc 0.037 bsc 0.012 0.003 millimeters min. s y m b o l a1 a2 a 0.01 0.70 tsot-23-6a max. 0.90 0.10 1.00 min. 0.000 0.028 inches 2.70 3.10 0.106 0.122 2.60 3.00 0.102 0.118 1.40 1.80 0.055 0.071 0.70 0.028
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 . 8 - s e p . , 2 0 1 3 a p w 7 2 0 9 w w w . a n p e c . c o m . t w 1 3 application 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 p 0 p1 p 2 d 0 d1 t a 0 b 0 k 0 sot - 23 - 6 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 - 0.4 0 3.20 ? 0.20 3.10 ? 0.20 1.50 ? 0.20 application 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 p 0 p1 p 2 d 0 d1 t a 0 b 0 k 0 t sot - 23 - 6 a 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 (mm) 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 d e v i c e s p e r u n i t package type unit quantity sot - 23 - 6 tape & reel 3000 t sot - 23 - 6 a tape & reel 3000 h t1 a d a e 1 a b w f t p0 od0 b a0 p2 k0 b 0 section b-b section a-a od1 p1
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 . 8 - s e p . , 2 0 1 3 a p w 7 2 0 9 w w w . a n p e c . c o m . t w 1 4 t a p i n g d i r e c t i o n i n f o r m a t i o n s o t - 2 3 - 6 aaax aaax aaax aaax aaax aaax aaax user direction of feed aaax aaax aaax aaax aaax aaax aaax user direction of feed t s o t - 2 3 - 6 a
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 . 8 - s e p . , 2 0 1 3 a p w 7 2 0 9 w w w . a n p e c . c o m . t w 1 5 c l a s s i f i c a t i o n p r o f i l e
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 . 8 - s e p . , 2 0 1 3 a p w 7 2 0 9 w w w . a n p e c . c o m . t w 1 6 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 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 - 1 2 0 seconds average ramp - up rate (t smax to t p ) 3 c/second ma x. 3 c/second max. liquidous temperature ( t l ) time at l iquidous (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 spec ified c lassification t emperature ( t c ) 2 0 ** seconds 3 0 ** seconds average r amp - down rate (t p to t smax ) 6 c/second max. 6 c/second max. time 25 c to p eak t emperature 6 minutes max. 8 minutes max. * tolerance for peak profile temperature (t p ) is defined a s 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 ? 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 ? 2.5 mm 260 c 250 c 245 c 3 2.5 mm 250 c 245 c 245 c table 1. snpb eutectic process ? classification temperatures (tc) package thickness volume mm 3 <350 volume mm 3 3 350 <2.5 mm 235 c 22 0 c 3 2.5 mm 220 c 220 c r e l i a b i l i t y t e s t p r o g r a m test item method description solderability jesd - 22, b102 5 sec, 245 c holt jesd - 22, a108 1000 hrs, bias @ t j =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 ? 2kv mm jesd - 22, a1 15 vmm ? 200v latch - up jesd 78 10ms, 1 tr ? 100ma
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 . 8 - s e p . , 2 0 1 3 a p w 7 2 0 9 w w w . a n p e c . c o m . t w 1 7 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, r.o.c. 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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