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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 . 2 - o c t . , 2 0 1 2 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 . f i x e d 6 0 0 k h z s t e p - u p c o n v e r t e r f o r w h i t e l e d s a p w 7 2 1 5 f e a t u r e s wide input voltage from 2.7v to 6v fixed 600khz switching frequency reference voltage : 0.2v pwm brightness control with wide frequency range of 5khz to 100khz build-in power mosfet: 0.3 w over-voltage protection under voltage lockout protection over temperature protection <1 m a quiescent current during shutdown tdfn2x2-6 package halogen and lead free 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 t h e a p w 7 2 1 5 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 6 0 0 k h z 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 w h i t e l e d s . 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 . 6 0 0 k h z c o n s t a n t s w i t c h i n g f r e q u e n c y 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 l x 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 l x 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 1 5 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 a n d 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 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 1 5 i s a v a i l a b l e i n t d f n 2 x 2 - 6 p a c k a g e . 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 gnd vin v out en lx fb l 1 22 h c 2 1 f c 1 1 f r 1 v in 10 strings pwm dimming tdfn 2 x 2 - 6 top view nc apw 7215 1 6 5 4 3 2 fb gnd vin lx en
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 . 2 - o c t . , 2 0 1 2 w w w . a n p e c . c o m . t w 2 a p w 7 2 1 5 symbol parameter rating unit v in vin pin to gnd - 0.3 to 7 v fb and en to gnd - 0.3 ~ v in v v lx lx pin to gnd - 0.3 to 40 v p d power dissipation internally limit w t j maximum junction temperature 150 c t stg storage temperature range - 65 to 150 c t sd r 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 symbol parameter typical value unit q ja junction - to - ambient resistance in free air (note 2) tdfn2x2 - 6 165 o c/w q jc junction - to - case resistance tdfn2x2 - 6 20 o c/w 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 n o t e 2 : q j a i s m e a s u r e d w i t h t h e c o m p o n e n t m o u n t e d o n a h i g h e f f e c t i v e t h e r m a l c o n d u c t i v i t y t e s t b o a r d i n f r e e a i r . apw 7215 handling code temperature range package code assembly material apw 7215 qb : x - date code w 15 x package code qb : tdfn 2 x 2 - 6 operating ambient temperature range i : - 40 to 85 o c handling code tr : tape & reel assembly material g : halogen and lead free device
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 . 2 - o c t . , 2 0 1 2 w w w . a n p e c . c o m . t w 3 a p w 7 2 1 5 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 2.7 ~ 6 v c in input capacitor 1 ~ f c out output capacitor 1 ~ f l1 converter output inductor 4.7 ~ 22 m h t a ambient temperature - 40 ~ 85 c t j junction temperature - 40 ~ 125 c n o t e 3 : p l e a s e r e f e r t o 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 . 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 =3.6v, t a =25c. apw72 15 symbol parameter test condition s min. typ. max. unit supply voltage and current v in input voltage range 2.7 - 6 v i dd1 v fb = 0.4v, no switching - - 800 m a i dd2 v fb = gnd, switching - 1.2 1.7 ma i sd input dc bias current en = gnd - - 1 m a under - voltage lockout uvlo threshold voltage v in rising 2.2 2.4 2.6 v uvlo hysteresis voltage v in falling 50 100 200 mv reference and output voltages v ref regulated feedback voltage v in =2.7v ~ 6v, t a = 25 c 194 200 206 mv i fb fb input cu rrent v fb =1.23v - 1 - 1 m a internal power switch f sw switching frequency 540 600 660 khz r on power switch on resistance vin=3.6v - 0.3 0.7 vin=3v - - 0.7 w lx leakage current v en =0v, v lx = 35 v, v i n = 6 v - - 100 m a d max lx maximum duty cycle 92 95 98 % output over voltage protection v lx_ovp over voltage threshold v lx rising 36 38 40 v power switch current limit i lim n - channel mosfet current limit duty = d max 1.5 - - 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 . 2 - o c t . , 2 0 1 2 w w w . a n p e c . c o m . t w 4 a p w 7 2 1 5 p i n d e s c r i p t i o n pin. tdfn - 2x2 - 6 name function 1 fb feedback pin. connect this pin to cathode of the lowest led and current - sense resistor (r1). calculate resistor value according to r1=v ref /i led . 2 nc no commend. 3 gnd power and signal ground pin. 4 lx switch pin. c onnect this pin to inductor/diode here. 5 en enable control input. forcing this pin above 1.0v enables the device, or forcing this pin below 0.4v to shut it down. in shutdown, all functions are disabled to decrease the supply current below 1a. 6 vin main supply pin. must be closely decoupled to gnd with a 1 f or greater ceramic capacitor. exposed pad gnd connecting this pad to gnd. 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 =3.6v, t a =25c. apw72 15 symbol parameter test condition s min. typ. max. unit enable and shutdown enable voltage threshold v en rising 1 - - v shutdown voltage threshold v en falling - - 0.4 v en pulled low resistance - 800 - k w en minimum on pulsed widt h use v en =3v to enable to device, pwm dimmimg frequency=5k to 100k hz - 4.7 - % over - temperature protection t otp over - temperature protection (note 4) t j rising - 150 - c over - temperature protection hysteresis (note 4) t j falling - 40 - c n o t e 4 : g u a r a n t e e d b y d e s i g n , n o t p r o d u c t i o n t e s t e 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 . 2 - o c t . , 2 0 1 2 w w w . a n p e c . c o m . t w 5 a p w 7 2 1 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 vin input voltage vs . efficiency vin input voltage ( v ) e f f i c i e n c y ( % ) 2 . 5 3 3 . 5 4 4 . 5 5 5 . 5 6 50 . 0 60 . 0 70 . 0 80 . 0 90 . 0 100 . 0 en dimming cycle vs . led current 0 3 6 9 12 15 18 21 0 10 20 30 40 50 60 70 80 90 100 en dimming cycle (%) l e d c u r r e n t ( m a ) - 5 k hz - 50 k hz - 100 k hz vin input voltage ( v ) l e d c u r r e n t ( m a ) vin input voltage vs . led current 19 . 5 19 . 7 19 . 9 20 . 1 20 . 3 20 . 5 3 3 . 25 3 . 5 3 . 75 4 4 . 25 4 . 5 4 . 75 5 vin input voltage ( v ) m a x i m u m d u t y c y c l e ( % ) 2 . 5 3 3 . 5 4 4 . 5 5 5 . 5 6 6 . 5 97 97 . 5 98 98 . 5 99 99 . 5 100 vin input voltage vs . max duty cycle vin input voltage ( v ) r o n ( o h m ) 0 0 . 1 0 . 2 0 . 3 0 . 4 0 . 5 2 . 5 3 3 . 5 4 4 . 5 5 5 . 5 6 vin input voltage vs . ron en dimming cycle (%) f e e d b a c k v o l t a g e ( m v ) 0 20 40 60 80 100 120 140 160 180 200 0 20 40 60 80 100 en dimming cycle vs . feedback voltage - 5 k hz - 50 k hz - 100 k hz
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 . 2 - o c t . , 2 0 1 2 w w w . a n p e c . c o m . t w 6 a p w 7 2 1 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 led current ( ma ) e f f i c i e n c y ( % ) 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100 110 efficiency vs . led current - vin = 4 . 2 v - vin = 3 . 6 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 . 2 - o c t . , 2 0 1 2 w w w . a n p e c . c o m . t w 7 a p w 7 2 1 5 o p e r a t i n g w a v e f o r m s ch 1 : v out - 20 v / div ch 2 : lx - 20 v / div ch 3 : v fb - 200 mv / div ch 4 : i l - 500 ma / div time : 2 us / div normal operation 1 4 2 3 ch 1 : v out - 20 v / div ch 2 : v lx - 20 v / div ch 3 : v en - 2 v / div ch 4 : i l - 500 ma / div time : 2 us / div dimming , 100 k hz @ 50 % duty ch 1 ch 4 ch 2 ch 3 ch 1 : v out - 20 v / div ch 2 : v lx - 20 v / div ch 3 : v en - 2 v / div ch 4 : i l - 2 a / div time : 2 ms / div ovp ch 1 ch 4 ch 2 ch 3 ch 1 : v out - 20 v / div ch 2 : v lx - 20 v / div ch 3 : v en - 2 v / div ch 4 : i l - 1 a / div time : 4 ms / div power on ch 1 ch 4 ch 2 ch 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 . 2 - o c t . , 2 0 1 2 w w w . a n p e c . c o m . t w 8 a p w 7 2 1 5 o p e r a t i n g w a v e f o r m s ch 1 : v out - 20 v / div ch 2 : v lx - 20 v / div ch 3 : v en - 2 v / div ch 4 : i l - 500 ma / div time : 200 ms / div power off ch 1 ch 4 ch 2 ch 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 . 2 - o c t . , 2 0 1 2 w w w . a n p e c . c o m . t w 9 a p w 7 2 1 5 b l o c k d i a g r a m uvlo oscillator control logic s vin en fb gnd lx thermal shutdown v ref eamp i cmp soft - start comp v lx _ ovp nc 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 gnd vin v out en lx fb l 1 22 h c 2 1 f c 1 1 f r 1 v in 10 strings i led pwm dimming control
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 . 2 - o c t . , 2 0 1 2 w w w . a n p e c . c o m . t w 1 0 a p w 7 2 1 5 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 1 5 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 i n t e r n a l 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 d e 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 r e f e r e n c e v o l t a g e , w h i c h i n t u r n c a u s e s t h e i n t e r n a l 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 . vin under-voltage lockout (uvlo) 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 . 4 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 1 5 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 a i s e s 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 u r r e n t l i m i t c o m p a r a t o r . t h e i n - d u c t o r c u r r e n t l i m i t i s p r o p o r t i o n a l t o t h e v o l t a g e . w h e n t h e t h r e s h o l d v o l t a g e o f t h e i n t e r n a l s o f t - s t a r t c o m p a r a t o r i s r e a c h e d , t h e f u l l c u r r e n t l i m i t i s r e l e a s e d . 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 1 5 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 d e v i c e 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 1 5 . 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 1 5 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 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 1 m a m a x i m u m . t h i s p i n a l s o c o u l d b e u s e d a s a d i g i t a l i n p u t a l l o w i n g b r i g h t n e s s c o n t r o l l e d b y u s i n g a p w m s i g n a l w i t h f r e q u e n c y f r o m 5 k h z t o 1 0 0 k h z . t h e 0 % d u t y c y c l e o f p w m s i g n a l c o r r e - s p o n d s t o z e r o l e d s c u r r e n t a n d 1 0 0 % c o r r e s p o n d s t o f u l l o n e . i f u s e e n p i n t o e n a b l e t h e d e v i c e , s u g g e s t i o n d i m m i m g d u t y r a n g e i s f r o m 1 5 % t o 1 0 0 % a t 1 0 0 k h z d i m m i m g f r e q u e n c y . 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 n 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 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 l x p i n p r e v e n t s 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 . o n c e t h e v o l t a g e o n t h e l x 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 , 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 l x v o l t a g e f a l l s b e l o w t h e f a l l i n g o f o v p v o l t a g e t h r e s h o l 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 . 2 - o c t . , 2 0 1 2 w w w . a n p e c . c o m . t w 1 1 a p w 7 2 1 5 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 t h e 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 t h e 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 : h = in out ) max ( out ) max ( in v v i i 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 1 5 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 s 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 ? ? ? ? ? - ? d sw out in out out out cout f v v v c i v esr peak esr r i v ? d 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
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 . 2 - o c t . , 2 0 1 2 w w w . a n p e c . c o m . t w 1 2 a p w 7 2 1 5 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 . o u t p u t v o l t a g e s e t t i n g 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 e 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 v r e f . 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 : 1 r v i ref led = layout consideration 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 t h e g n d w i t h o u t a n y v i a h o l e s f o r g o o d i n p u t v o l t - a g e f i l t e r i n g . 2 . t o m i n i m i z e c o p p e r t r a c e c o n n e c t i o n s t h a t c a n i n j e c t n o i s e i n t o t h e s y s t e m , 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 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 e 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 . recommended minimum footprint 0 . 012 0 . 0315 0 . 0216 0 . 026 tdfn 2 x 2 - 6 unit : inch 0 . 00875 the via diameter = 0 . 012 hole size = 0 . 008 0 . 0 5 1 0 . 3048 0 . 8 0 . 54864 0 . 6604 tdfn 2 x 2 - 6 unit : mm 0 . 2222 5 the via diameter = 0 . 3048 hole size = 0 . 2032 layout 1 . 2 9 5 4
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 . 2 - o c t . , 2 0 1 2 w w w . a n p e c . c o m . t w 1 3 a p w 7 2 1 5 p a c k a g e i n f o r m a t i o n t d f n 2 x 2 - 6 s y m b o l min. max. 0.80 0.00 0.18 0.30 1.00 1.60 0.05 0.60 a a1 b d d2 e e2 e l millimeters a3 0.20 ref tdfn2x2-6 0.30 0.45 1.00 0.008 ref min. max. inches 0.031 0.000 0.007 0.012 0.039 0.063 0.024 0.012 0.018 1.90 2.10 0.075 0.083 1.90 2.10 0.075 0.083 0.20 k 0.008 0.70 0.039 0.028 0.002 0.65 bsc 0.026 bsc note : 1. followed from jedec mo-229 wccc. e l k e 2 pin 1 corner d2 a3 a1 b a d 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 . 2 - o c t . , 2 0 1 2 w w w . a n p e c . c o m . t w 1 4 a p w 7 2 1 5 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 tdfn2x2 - 6 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 2.35 + 0.20 2.35 + 0.20 1.30 ? 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 tdfn2x2 - 6 tape & reel 3000 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
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 . 2 - o c t . , 2 0 1 2 w w w . a n p e c . c o m . t w 1 5 a p w 7 2 1 5 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 t d f n 2 x 2 - 6 user direction of feed 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 . 2 - o c t . , 2 0 1 2 w w w . a n p e c . c o m . t w 1 6 a p w 7 2 1 5 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 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 r e l i a b i l i t y t e s t p r o g r a m
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 . 2 - o c t . , 2 0 1 2 w w w . a n p e c . c o m . t w 1 7 a p w 7 2 1 5 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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