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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 . 4 - d e c . , 2 0 1 0 a p w 7 1 3 6 a / b / c 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 8 w h i t e l e d s t h e a p w 7 1 3 6 a / b / c 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 h e a p w 7 1 3 6 / a / b / c i s a v a i l a b l e i n a s o t - 2 3 - 6 p a c k a g e s . f e a t u r e s wide input voltage from 2.7v to 6v 0.25v reference voltage fixed 1mhz switching frequency high efficiency up to 87% 100hz to 100khz pwm brightness control frequency open-led protection under-voltage lockout protection over-temperature protection <1 m a quiescent current dduring shutdown sot-23-6 packages 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 a p w 7 1 3 6 a / b / c 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 8 w h i t e l e d s i n s e r i e 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 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 1 m h z c u r r e n t - m o d e p w m o p e r a t i o n i s a v a i l a b l e f o r 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 d a s m a l l i n d u c t o r w h i l e m i n i m i z i n g r i p p l e o n t h e i n p u t s u p p l y . t h e o v p p i n m o n i t o r s t h e o u t p u t v o l t a g e a n d s t o p s s w i t c h i n g i f 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 . gnd vin v out en lx fb ovp 4 6 5 3 2 1 l1 22 m h c2 1 m f c1 4.7 m f r1 12 w v in up to 8 wleds off on 4 en 6 vin gnd 2 5 ovp fb 3 lx 1 sot-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 . 4 - d e c . , 2 0 1 0 a p w 7 1 3 6 a / b / c 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 ~ 8 v fb, en to gnd voltage - 0.3 ~ v in v v lx lx to gnd voltage - 0.3 ~ 38 v v ovp ovp to gnd voltage - 0.3 ~ 38 v t j maximum junction temperature 150 o c t stg storage temperature rang e - 65 ~ 150 o c t s dr maximum lead soldering temperature , 10 seconds 260 o 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 rating unit q ja junction to ambient t hermal r esistance (note 2) sot - 23 - 6 250 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 ) . symbol parameter range unit v in vin input voltage 2.7~ 6 v v out converter output voltage up to 32 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 to 47 m h 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 ) note 1: stresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. these are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. note 2: q ja is measured with the component mounted on a high effective thermal conductivity test board in free air. the exposed pad of package is soldered directly on the pcb. ovp voltage code a: 20v b: 28v c: 35v package code c : sot-23-6 operating ambient temperature range i : -40 to 85 o c handling code tr : tape & reel assembly material g : halogen and lead free device apw7136 handling code temperature range package code assembly material ovp voltage code apw7136yci : y - ovp voltage code x - date code cfyx
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 . 4 - d e c . , 2 0 1 0 a p w 7 1 3 6 a / b / c w w w . a n p e c . c o m . t w 3 symbol parameter range unit t a ambient temperature - 40 to 85 c t j junction temperature - 40 to 125 c note 3: refer to the application circuit for further information. 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 apw71 36a/b/c symbol parameter test conditions min. typ. max. unit supply voltage and current v in input voltage range t a = - 40 ~ 85 c , t j = - 40 ~ 125 c 2.7 - 6 v i dd1 v fb = 1.3v, no switching 70 100 130 a i dd2 fb = gnd , switching - 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 237 250 263 v ref regulated feedback voltage t a = - 40 ~ 85 c (t j = - 40 ~ 125 c ) 230 - 270 mv 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 0.9 1.2 a lx leakage curr ent 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 apw7136a - 20 - apw7136b - 28 - v ovp over - voltage threshold apw7136c - 35 - v ovp hysteresis - 3 - v ovp leakage current v ov p =30v, en=vin - - 50 a enable and shutdown 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 t j risi ng - 150 - c over - temperature protection hysteresis - 40 - c ( 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 . ) 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 ) ( c o n 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 . 4 - d e c . , 2 0 1 0 a p w 7 1 3 6 a / b / c 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 efficiency vs. wled current efficiency vs. wled current wled current vs. pwm duty cycle switch on resistance vs. supply voltage wled current 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 , 8 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 . ) 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 8 wleds 25.6v@20ma h= p out /p in v in =3.3v v in =4.2v v in =3.6v v in =5v @ e f f i c i e n c y ( h ) wled current, i led (ma) 0 5 10 15 20 25 30 50 55 60 65 70 75 80 85 90 95 v in =3.3v v in =3.6v v in =4.2v v in =5v 6 wleds 19.3v@20ma h= p out /p in @ e f f i c i e n c y ( h ) supply voltage, v in (v) 4 wleds 13v@20ma h= p out /p in v in =3.3v v in =3.6v v in =4.2v v in =5v 0 5 10 15 20 25 30 50 55 60 65 70 75 80 85 90 95 @ 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 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 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
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 . 4 - d e c . , 2 0 1 0 a p w 7 1 3 6 a / b / c 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 switching frequency vs. supply voltage maximum duty cycle 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 , 8 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 . ) 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 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
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 . 4 - d e c . , 2 0 1 0 a p w 7 1 3 6 a / b / c w w w . a n p e c . c o m . t w 6 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 , 8 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 . ) start-up ch1: v en , 2v/div, dc ch2: v in , 2v/div, dc ch3: v out , 10v/div, dc ch4: i l , 0.1a/div, dc time: 1ms/div 2 1 3 4 v out i in , 0.1a/div v in v en 8wleds, l=22 h, v in =3.6v, i led =20ma ch1: v en , 2v/div, dc ch2: v in , 2v/div, dc ch3: v out , 10v/div, dc ch4: i l , 0.1a/div, dc time: 1ms/div start-up 2 1 3 4 v out i in , 0.1a/div v in v en 6wleds, l=22 h, v in =3.6v, i led =20ma ch1: v en , 2v/div, dc ch2: v in , 2v/div, dc ch3: v out , 10v/div, dc ch4: i l , 0.1a/div, dc time: 1ms/div start-up 2 1 3 4 v out i in , 0.1a/div v in v en 4wleds, l=22 h, v in =3.6v, i led =20ma ch1: v out , 10v/div, dc time: 20ms/div open-led protection 1 v out ,10v/div apw7136c
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 . 4 - d e c . , 2 0 1 0 a p w 7 1 3 6 a / b / c 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 ( 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 , 8 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 . ) ch1: v lx , 20v/div, dc ch2: v out , 50v/div, ac ch3: i l , 0.1a/div, dc time: 1 m s/div normal operating waveform 3 2 1 v out, 50mv/div,ac v lx , 20v/div, dc i l , 0.1a/div 8wleds, l=22 h, v in =3.6v, i led =20ma
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 . 4 - d e c . , 2 0 1 0 a p w 7 1 3 6 a / b / c w w w . a n p e c . c o m . t w 8 b l o c k d i a g r a m p i n d e s c r i p t i o n pin no. name function 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 0.25v. connect this pin to cathode of the lowest led and resistor (r1). calculate resistor value according to r1=0.25v/i led . 4 en enable control i nput. forcing this pin above 1. 0 v enables the device, or forcing this pin below 0. 4 v to shut it down. in shutdown, all f unctions are disabled to decrease the supply current below 1 m 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 m f or greater ceramic capacitor. uvlo oscillator control logic s vin en fb gnd lx ovp over- temperature protection v ref 0.25v 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 . 4 - d e c . , 2 0 1 0 a p w 7 1 3 6 a / b / c w w w . a n p e c . c o m . t w 9 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 ovp 4 6 5 3 2 1 l1 1 0 m h c2 10 m f c1 10 m f r1 1.4 w 0603 v in 4.5v~6v 9 strings total off on figure 4. circuit for driving 27 wleds apw7136 gnd vin v out en lx fb ovp 4 6 5 3 2 1 l1 22 m h c2 1 m f c1 4.7 m f r1 12 w v in up to 8 wleds off on figure 1. typical 8 wleds application apw7136 gnd vin v out en lx fb ovp 4 6 5 3 2 1 l1 22 m h c2 1 m f c1 4.7 m f r1 12 w v in up to 8 wleds figure 2. brightness control using a pwm signal applies to en 100hz~100khz duty=100%, i led =20ma duty=0%, led off apw7136 gnd vin v out en lx fb ovp 4 6 5 3 2 1 l1 22 m h c2 1 m f c1 4.7 m f r1 12 w r2 10k r3 120k c3 0.1 m f r4 10k v in pwm brightness control duty=100%, led off duty=0%, i led =20ma 3.3v 0v up to 8 wleds figure 3. brightness control using a filtered pwm signal off on apw7136 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
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 . 4 - d e c . , 2 0 1 0 a p w 7 1 3 6 a / b / c w w w . a n p e c . c o m . t w 1 0 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 1 3 6 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 r e s i s t i v e d i v i d e r c o n n e c t e d b e t w e e n v o u t 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 n o u t p u 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 o a d c u r r e n t i n c r e a s e s , 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 . 2 5 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 a v e r a g e i n d u c t o r c u r r e n t m a t c h e s t h e n e w l o a d c u r r e 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 , 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 i c a l ) 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 1 3 6 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 , 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 , r a i s e s 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 1 3 6 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 1 3 6 f r o m d a m a g i n g d u r i n g 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 ) the over-temperature circuit limits the junction tempera- ture of the apw7136. when the junction temperature ex- ceeds 150 o c , a thermal sensor turns off the power mosfet, allowing the devices to cool. the thermal sen- sor allows the converters to start a soft-start process and regulate the output voltage again after the junction tem- perature cools by 40 o c . the otp is designed with a 40 o c hysteresis to lower the average junction temperature (t j ) during continuous thermal overload conditions, in- creasing the lifetime of the device. 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 t h e g r o u n d p l a c e s t h e a p w 7 1 3 6 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 , 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 o v p 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 . this pin also could be used as a digital input allowing brightness control using a pwm signal from 100hz to 100khz. the 0% duty cycle of pwm signal corresponds to zero leds current and 100% corresponds 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 . 4 - d e c . , 2 0 1 0 a p w 7 1 3 6 a / b / c w w w . a n p e c . c o m . t w 1 1 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 conduction 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 operates 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 reasonable 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 ob- tained 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 1 3 6 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 ( ) ? ? ? ? ? d h - ? ? ? ? ? 3 avg l l ) max ( out sw in out 2 out in i i i f v v v v l 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
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 . 4 - d e c . , 2 0 1 0 a p w 7 1 3 6 a / b / c w w w . a n p e c . c o m . t w 1 2 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 t h 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 . 2 5 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 : i l e d = 0 . 2 5 v / r 1 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 gtsd32 22 0.592 0.52 3.85 x 3.85 x 1.8 recommended capacitor selection designator manufacturer p art number capacitance ( f) tc code rated voltage (v) case size c1 murata grm188r60j475ke19 4.7 x5r 6.3 0603 c2 murata grm21br71h105ka12 1.0 x7r 50 0805 recommended diode selection designator manufacturer part number maximum average forward rectified cu rrent ( a) maximum repetitive peak reverse voltage (v) case size d1 zowie mscd106 1.0 60 0805 d1 zowie mscd104 1.0 40 0805 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 . 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 r 1 r 4 r 3 r 2 c 3 via to ovp via to gnd l1 c1 via to v out d1 v adj v en v in lx refer to figure. 3 c 2 optimized apw7136 layout v out
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 . 4 - d e c . , 2 0 1 0 a p w 7 1 3 6 a / b / c w w w . a n p e c . c o m . t w 1 3 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. seating plane < 4 mils -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 . 4 - d e c . , 2 0 1 0 a p w 7 1 3 6 a / b / c w w w . a n p e c . c o m . t w 1 4 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 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 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 (mm) d e v i c e s p e r u n i t package type unit quantity sot - 23 - 6 tape & reel 3000
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 . 4 - d e c . , 2 0 1 0 a p w 7 1 3 6 a / b / c w w w . a n p e c . c o m . t w 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 s o t - 2 3 - 6 c l a s s i f i c a t i o n p r o f i l e user direction of feed aaax aaax aaax aaax aaax aaax aaax
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 . 4 - d e c . , 2 0 1 0 a p w 7 1 3 6 a / b / c w w w . a n p e c . c o m . t w 1 6 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 spe cified 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 as a supplier minimum and a user maximum. ** tolerance for time at peak profile temperature (t p ) is defined as a supplier minimum and a user maximum. 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 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 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 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 . 4 - d e c . , 2 0 1 0 a p w 7 1 3 6 a / b / c 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 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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