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h i g h p o w e r s t e p - d o w n s y n c h r o n o u s d c / d c c o n t r o l l e r 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 . 5 - j u n . , 2 0 0 8 a p w 7 0 5 7 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 . o p e r a t e s f r o m + 5 v i n p u t 0 . 8 v i n t e r n a l r e f e r e n c e v o l t a g e - 1 . 5 % a c c u r a c y o v e r l i n e , l o a d a n d t e m p e r a t u r e 0 . 8 v t o v c c o u t p u t r a n g e f u l l d u t y c y c l e r a n g e - 0 % t o 1 0 0 % i n t e r n a l l o o p c o m p e n s a t i o n i n t e r n a l s o f t - s t a r t - t y p i c a l 2 m s p r o g r a m m a b l e o v e r - c u r r e n t p r o t e c t i o n - l o s s l e s s s e n s i n g u s i n g m o s f e t r d s ( o n ) u n d e r - v o l t a g e p r o t e c t i o n d r i v e s e x t e r n a l n - c h a n n e l m o s f e t s s h u t d o w n c o n t r o l s m a l l s o p - 8 p a c k a g e lead free and green devices avaliable (rohs compliant) f e a t u r e s a p p l i c a t i o n s m o t h e r b o a r d g r a p h i c s c a r d s c a b l e o r d s l m o d e m s , s e t t o p b o x e s d s p s u p p l i e s m e m o r y s u p p l i e s 5 v i n p u t d c - d c r e g u l a t o r s d i s t r i b u t e d p o w e r s u p p l i e 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 0 5 7 i s a 3 0 0 k h z c o n s t a n t f r e q u e n c y v o l t a g e m o d e s y n c h r o n o u s s w i t c h i n g c o n t r o l l e r t h a t d r i v e s e x t e r - n a l n - c h a n n e l m o s f e t s . w h e n t h e i n p u t s u p p l y d r o p s c l o s e t o o u t p u t , t h e u p p e r m o s f e t r e m a i n s o n , a c h i e v - i n g 1 0 0 % d u t y c y c l e . i n t e r n a l l o o p c o m p e n s a t i o n i s o p t i - m i z e d f o r f a s t t r a n s i e n t r e s p o n s e , e l i m i n a t i n g e x t e r n a l c o m p e n s a t i o n n e t w o r k . t h e p r e c i s i o n 0 . 8 v r e f e r e n c e m a k e s t h i s p a r t s u i t a b l e f o r a w i d e v a r i e t y o f l o w v o l t a g e a p p l i c a t i o n s . s o f t - s t a r t i s i n t e r n a l l y s e t t o 2 m s , l i m i t i n g t h e i n p u t i n - r u s h c u r r e n t a n d p r e v e n t i n g t h e o u t p u t f r o m o v e r s h o o t d u r i n g p o w e r i n g u p . t h e a p w 7 0 5 7 h a s o v e r c u r r e n t a n d s h o r t c i r c u i t p r o t e c t i o n s . o v e r c u r r e n t p r o t e c t i o n i s a c h i e v e d b y m o n i - t o r i n g t h e v o l t a g e d r o p a c r o s s t h e h i g h s i d e m o s f e t , e l i m i n a t i n g t h e n e e d f o r a c u r r e n t s e n s i n g r e s i s t o r a n d s h o r t c i r c u i t c o n d i t i o n i s d e t e c t e d t h r o u g h t h e f b p i n . i f e i t h e r f a u l t c o n d i t i o n s o c c u r , t h e a p w 7 0 5 7 w o u l d i n i t i a t e t h e s o f t - s t a r t c y c l e . a f t e r t h r e e c y c l e s a n d i f t h e f a u l t c o n d i - t i o n p e r s i s t s , t h e c o n t r o l l e r w i l l b e s h u t d o w n . t o r e s t a r t t h e c o n t r o l l e r , e i t h e r r e c y c l e t h e v c c s u p p l y o r m o m e n - t a r i l y p u l l t h e o s c s e t p i n b e l o w 1 . 2 5 v . t h e a p w 7 0 5 7 c a n b e s h u t d o w n b y p u l l i n g t h e o c s e t p i n b e l o w 1 . 2 5 v . i n s h u t d o w n , b o t h g a t e d r i v e s i g n a l s w i l l b e l o w . t h e c o n t r o l l e r i s a v a i l a b l e i n a s m a l l s o p - 8 p a c k a g e . p i n c o n f i g u r a t i o n s o p - 8 ( t o p v i e w ) boot ugate ocset gnd lgate fb vcc phase 1 2 3 4 8 6 7 5
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 5 - j u n . , 2 0 0 8 a p w 7 0 5 7 w w w . a n p e c . c o m . t w 2 o r d e r i n g a n d m a r k i n g i n f o r m a t i o n apw7057 handling code temp erature range package code package code k : sop-8 operating junction temp erature range c : 0 to 70 c handling code tr : tape & reel apw7057 k : apw7057 xxxxx xxxxx - date code assembly material assembly material l : lead free device g : halogen and lead free device n o t e : a n p e c l e a d - f r e e p r o d u c t s c o n t a i n m o l d i n g c o m p o u n d s / d i e a t t a c h m a t e r i a l s a n d 1 0 0 % m a t t e t i n p l a t e t e r m i n a t i o n f i n i s h ; w h i c h a r e f u l l y c o m p l i a n t w i t h r o h s . a n p e c l e a d - f r e e p r o d u c t s m e e t o r e x c e e d t h e l e a d - f r e e r e q u i r e m e n t s o f i p c / j e d e c j - s t d - 0 2 0 c f o r m s l c l a s s i f i c a t i o n a t l e a d - f r e e p e a k r e f l o w t e m p e r a t u r e . a n p e c d e f i n e s ? g r e e n ? t o m e a n l e a d - f r e e ( r o h s c o m p l i a n t ) a n d h a l o g e n f r e e ( b r o r c l d o e s n o t e x c e e d 9 0 0 p p m b y w e i g h t i n h o m o g e n e o u s m a t e r i a l a n d t o t a l o f b r a n d c l d o e s n o t e x c e e d 1 5 0 0 p p m b y w e i g h t ) . a b s o l u t e m a x i m u m r a t i n g s symbol parameter rating unit v cc vcc supply voltage (vcc to gnd) - 0.3 ~ 7 v v boot boot supply voltage (boot to gnd) - 0.3 ~ 15 v phase, ocset to gnd input voltage - 0.3 ~ 12 v fb to gnd input voltage - 0.3 ~ vcc+0.3 v maximum junction temperature 125 o c t stg storage temperature - 65 ~ 150 o c t sdr maximum lead soldering temperature, 10 seconds 260 o c 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 f ree a ir sop - 8 160 o c/w 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 symbol parameter range unit v cc vcc supply voltage 5 5% v v out output voltage of the switching regulator (note) 0.8 ~ vcc v v in input voltage of the switching regulator (note) 3.3 ~ vcc v t a ambient temperature 0 ~ 70 o c t j junction temperature 0 ~ 125 o c n o t 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
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 . 5 - j u n . , 2 0 0 8 a p w 7 0 5 7 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 u n l e s s o t h e r w i s e s p e c i f i e d , 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 c c = 5 v , v b o o t = 1 2 v a n d t a = 0 ~ 7 0 o c . t y p i c a l v a l u e s a r e a t t a = 2 5 o c . apw7057 symbol parameter test conditions min . typ . max . unit supply current i vcc vcc nominal supply current ugate and lgate open - 2.1 - ma i boot boot nominal supply current ugate open - 2.1 - ma under voltage lockout ( uvlo ) rising vcc thresh old 4.0 4.2 4.4 v falling vcc threshold 3.8 4.0 4.2 v oscillator f osc free running frequency 250 300 340 khz ramp upper threshold - 2.85 - v ramp lower threshold - 0.95 - v d v osc ramp amplitude - 1.9 - vp - p reference voltage v ref ref erence voltage - 0.8 - v reference voltage accuracy - 1.5 - +1.5 % error amplifier dc gain - 75 - db f p first pole frequency - 10 - hz f z first zero frequency - 1 - khz ugate duty range 0 - 100 % fb input current - - 0.1 m a pwm con troller gate drivers ugate source vuagte=1v - 0.6 - a ugate sink vugate=1v - 7.3 - w lgate source vlgate=1v - 0.6 - a lgate sink vlgate=1v - 1.8 - w t d dead time - 50 - ns protection i ocset ocset sink current vocset=4.5v 34 40 46 m a uv fb fb un der - voltage level fb falling - 0.5 - v fb under - voltage hysteresis - 15 - mv
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 . 5 - j u n . , 2 0 0 8 a p w 7 0 5 7 w w w . a n p e c . c o m . t w 4 apw7057 symbol parameter test conditions min . typ . max . unit soft - start and shutdown t ss soft - start interval - 2 - ms shutdown threshold vocset falling - 1.25 - v ocset shutdown hysteresis - 20 - mv a n o v e r c u r r e n t c o n d i t i o n w i l l c y c l e t h e s o f t - s t a r t f u n c t i o n . a f t e r t h r e e c o n s e c u t i v e c y c l e s a n d i f t h e f a u l t c o n d i t i o n p e r s i s t s , t h e c o n t r o l l e r w i l l b e s h u t d o w n . t o r e s t a r t t h e c o n t r o l l e r , e i t h e r r e c y c l e t h e v c c s u p p l y o r m o m e n t a r i l y p u l l t h e o s c s e t p i n b e l o w 1 . 2 5 v . v c c ( p i n 5 ) 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 . ) u n l e s s o t h e r w i s e s p e c i f i e d , 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 c c = 5 v , v b o o t = 1 2 v a n d t a = 0 ~ 7 0 o c . t y p i c a l v a l u e s a r e a t t a = 2 5 o c . f u n c t i o n p i n d e s c r i p t i o n g n d ( p i n 3 ) b o o t ( p i n 1 ) t h i s p i n p r o v i d e s t h e s u p p l y v o l t a g e t o t h e h i g h s i d e m o s f e t d r i v e r . a v o l t a g e n o g r e a t e r t h a n 1 3 v c a n b e c o n - n e c t e d t o t h i s p i n a s a s u p p l y t o t h e d r i v e r . f o r d r i v i n g l o g i c l e v e l n - c h a n n e l m o s e f t , a b o o t s t r a p c i r c u i t c a n b e u s e t o c r e a t e a s u i t a b l e d r i v e r ? s s u p p l y . u g a t e ( p i n 2 ) t h i s p i n p r o v i d e s g a t e d r i v e f o r t h e h i g h - s i d e m o s f e t . s i g n a l a n d p o w e r g r o u n d f o r t h e i c . a l l v o l t a g e l e v e l s a r e m e a s u r e d w i t h r e s p e c t t o t h i s p i n . t i e t h i s p i n t o t h e g r o u n d p l a n e t h r o u g h t h e l o w e s t i m p e d a n c e c o n n e c t i o n a v a i l a b l e . l g a t e ( p i n 4 ) t h i s p i n p r o v i d e s t h e g a t e d r i v e s i g n a l f o r t h e l o w s i d e m o s f e t . t h i s i s t h e m a i n b i a s s u p p l y f o r t h e c o n t r o l l e r a n d i t s l o w s i d e m o s f e t d r i v e r . m u s t b e c l o s e l y d e c o u p l e d t o g n d ( p i n 3 ) . d o n o t a p p l y a v o l t a g e g r e a t e r t h a n 5 . 5 v t o t h i s p i n . f b ( p i n 6 ) t h i s p i n i s t h e i n v e r t i n g i n p u t o f t h e e r r o r a m p l i f i e r a n d i t r e c e i v e s t h e f e e d b a c k v o l t a g e f r o m 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 a c r o s s t h e o u t p u t ( v o u t ) . t h e o u t p u t v o l t a g e i s d e - t e r m i n e d b y : v o u t = 0 . 8 v ( 1 + ) r o u t r g n d w h e r e r o u t i s t h 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 v o u t a n d f b w h i l e r g n d i s t h e r e s i s t o r c o n n e c t e d f r o m f b t o g n d . o c s e t ( p i n 7 ) t h i s p i n s e r v e s t w o f u n c t i o n s : a s a s h u t d o w n c o n t r o l a n d f o r s e t t i n g t h e o v e r c u r r e n t l i m i t t h r e s h o l d . p u l l i n g t h i s p i n b e l o w 1 . 2 5 v s h u t s t h e c o n t r o l l e r d o w n , f o r c i n g t h e u g a t e a n d l g a t e s i g n a l s t o b e a t 0 v . a s o f t - s t a r t c y c l e w i l l b e i n i t i a t e d u p o n t h e r e l e a s e o f t h i s p i n . a r e s i s t o r ( r o c s e t ) c o n n e c t e d b e t w e e n t h i s p i n a n d t h e d r a i n o f t h e h i g h s i d e m o s f e t w i l l d e t e r m i n e t h e o v e r c u r r e n t l i m i t . a n i n t e r n a l l y g e n e r a t e d 4 0 m a c u r r e n t s o u r c e w i l l f l o w t h r o u g h t h i s r e s i s t o r , c r e a t i n g a v o l t a g e d r o p . t h i s v o l t - a g e w i l l b e c o m p a r e d w i t h t h e v o l t a g e a c r o s s t h e h i g h s i d e m o s f e t . t h e t h r e s h o l d o f t h e o v e r c u r r e n t l i m i t i s t h e r e f o r e g i v e n b y : i o i = 4 0 u a x r o c s e t r d s ( o n ) p h a s e ( p i n 8 ) t h i s p i n i s c o n n e c t e d t o t h e s o u r c e o f t h e h i g h - s i d e m o s f e t a n d i s u s e d t o m o n i t o r t h e v o l t a g e d r o p a c r o s s t h e h i g h - s i d e m o s f e t f o r o v e r - c u r r e n t p r o t e c t i o n .
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 . 5 - j u n . , 2 0 0 8 a p w 7 0 5 7 w w w . a n p e c . c o m . t w 5 f i g u r e 1 . b l o c k d i a g r a m vcc undervoltage lockout vcc ocset ugate lgate oscillator gate control v ref 0.8v soft-start and fault logic f osc 300khz phase error amplifier fb pwm inhibit i ocset 40 m a oc comparator comp 0.5v uvp gnd uvlo soft-start ocp shutdown boot - + - +
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 . 5 - j u n . , 2 0 0 8 a p w 7 0 5 7 w w w . a n p e c . c o m . t w 6 v in +5v v out +2.5v/10a 1uf c2 1000uf x2 c5 1000uf x2 q1 l1 3.3uh ugate lgate 4 vcc gnd ocset 7 phase 8 q2 c1 1uf 2 u1 apw7057 fb 6 boot 1 d1 1n4148 r2 2.4k c6 0.1uf r1 5.1k r4 8.2k c4 0.1uf q3 shutdown r3 2.2 c7 470pf c3 q1: apm2014n uc q2: apm2014n uc q3: 2n7002 c2: 1000uf/10v, esr = 25m w c5: 1000uf/6.3v, esr = 25m w 5 3 + + 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 f i g u r e 2 .
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 5 - j u n . , 2 0 0 8 a p w 7 0 5 7 w w w . a n p e c . c o m . t w 7 250 260 270 280 290 300 310 320 330 340 350 -50 -25 0 25 50 75 100 125 150 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 0.788 0.792 0.796 0.800 0.804 0.808 0.812 -50 -25 0 25 50 75 100 125 150 r e f e r e n c e v o l t a g e v s . j u n c t i o n t e m p e r a t u r e reference voltage, vref (v) j u n c t i o n t e m p e r a t u r e ( o c ) s w i t c h i n g f r e q u e n c y v s . j u n c t i o n t e m p e r a t u r e j u n c t i o n t e m p e r a t u r e ( c ) switching frequency, fosc (khz) 34 35 36 37 38 39 40 41 42 43 44 45 46 -50 -25 0 25 50 75 100 125 150 o c s e t c u r r e n t v s . j u n c t i o n t e m p e r a t u r e j u n c t i o n t e m p e r a t u r e ( o c ) ocset current , iocset ( m 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 . 5 - j u n . , 2 0 0 8 a p w 7 0 5 7 w w w . a n p e c . c o m . t w 8 o p e r a t i n g w a v e f o r m s ( 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 ) 1 . l o a d t r a n s i e n t r e s p o n s e : i o u t = 0 a - > 1 0 a - > 0 a - i o u t s l e w r a t e = 1 0 a / m s i o u t = 0 a - > 1 0 a c h 1 : v o u t , 1 0 0 m v / d i v , d c , o f f s e t = 2 . 5 0 v c h 2 : v u g a t e , 1 0 v / d i v , d c a x 1 : i o u t , 5 a / d i v t i m e : 1 0 m s / d i v b w = 2 0 m h z c h 1 : v o u t , 1 0 0 m v / d i v , d c , o f f s e t = 2 . 5 0 v a x 1 : i o u t , 5 a / d i v t i m e : 1 0 0 m s / d i v b w = 2 0 m h z c h 1 : v o u t , 1 0 0 m v / d i v , d c , o f f s e t = 2 . 5 0 v c h 2 : v u g a t e , 1 0 v / d i v , d c a x 1 : i o u t , 5 a / d i v t i m e : 1 0 m s / d i v b w = 2 0 m h z i o u t = 0 a - > 1 0 a - > 0 a i o u t = 1 0 a - > 0 a v o u t i o u t v o u t i o u t 1 0 a 0 a v u g a t e v o u t i o u t v u g a t e 2 . u g a t e a n d l g a t e u g a t e r i s i n g c h 1 : v u g a t e , 2 v / d i v , d c c h 2 : v l g a t e , 2 v / d i v , d c t i m e : 1 2 5 n s / d i v b w = 5 0 0 m h z u g a t e f a l l i n g i o u t = 1 0 a v l g a t e v u g a t e v u g a t e i o u t = 1 0 a v l g a t e c h 1 : v u g a t e , 2 v / d i v , d c c h 2 : v l g a t e , 2 v / d i v , d c t i m e : 1 2 5 n s / d i v b w = 5 0 0 m h z
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 . 5 - j u n . , 2 0 0 8 a p w 7 0 5 7 w w w . a n p e c . c o m . t w 9 o p e r a t i n g w a v e f o r m s ( c o n t . ) 3 . p o w e r i n g o n / o f f s o f t - s t a r t a t p o w e r i n g o n v o u t v i n c h 1 : v i n , 2 v / d i v , d c c h 2 : v o u t , 1 v / d i v , d c t i m e : 1 m s / d i v b w = 2 0 m h z p o w e r i n g o f f v o u t v i n c h 1 : v i n , 2 v / d i v , d c c h 2 : v o u t , 1 v / d i v , d c t i m e : 5 m s / d i v b w = 2 0 m h z 4 . s h o r t - c i r c u i t p r o t e c t i o n u n d e r - v o l t a g e ( u v p ) a n d o v e r - c u r r e n t p r o t e c t i o n ( o c p ) v o u t c h 1 : v o u t , 1 v / d i v , d c a x 1 : i o u t , 1 0 a / d i v t i m e : 1 m s / d i v b w = 2 0 m h z i o u t u v p o c p o c p ( 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 )
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 . 5 - j u n . , 2 0 0 8 a p w 7 0 5 7 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 2 2 c o m p o n e n t s e l e c t i o n g u i d e l i n e s 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 s e l e c t i o n o f c o u t i s d e t e r m i n e d b y t h e r e q u i r e d e f f e c - t i v e s e r i e s r e s i s t a n c e ( e s r ) a n d v o l t a g e r a t i n g r a t h e r t h a n t h e a c t u a l c a p a c i t a n c e r e q u i r e m e n t . t h e r e f o r e , s e l e c t h i g h p e r f o r m a n c e l o w e s r c a p a c i t o r s t h a t a r e i n t e n d e d f o r s w i t c h i n g r e g u l a t o r a p p l i c a t i o n s . i n s o m e a p p l i c a t i o n s , m u l t i p l e c a p a c i t o r s h a v e t o b e p a r a l l e d t o a c h i e v e t h e d e s i r e d e s r v a l u e . i f t a n t a l u m c a p a c i t o r s a r e u s e d , m a k e s u r e t h e y a r e s u r g e t e s t e d b y t h e m a n u f a c t u r e s . i f i n d o u b t , c o n s u l t t h e c a p a c i t o r s m a n u f a c t u r e r . 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 i s c h o s e n b a s e d o n t h e v o l t a g e r a t i n g a n d t h e r m s c u r r e n t r a t i n g . f o r r e l i a b l e o p e r a t i o n , s e l e c t t h e c a p a c i t o r v o l t a g e r a t i n g t o b e a t l e a s t 1 . 3 t i m e s h i g h e r t h a n t h e m a x i m u m i n p u t v o l t a g e . t h e m a x i m u m r m s c u r r e n t r a t i n g r e q u i r e m e n t i s a p p r o x i m a t e l y i o u t / 2 , w h e r e i o u t i s t h e l o a d c u r r e n t . d u r i n g p o w e r u p , t h e i n p u t c a p a c i - t o r s h a v e t o h a n d l e l a r g e a m o u n t o f s u r g e c u r r e n t . i f t a n t a - l u m c a p a c i t o r s a r e u s e d , m a k e s u r e t h e y a r e s u r g e t e s t e d b y t h e m a n u f a c t u r e s . i f i n d o u b t , c o n s u l t t h e c a p a c i t o r s m a n u f a c t u r e r . f o r h i g h f r e q u e n c y d e c o u p l i n g , a c e r a m i c c a p a c i t o r b e - t w e e n 0 . 1 m f t o 1 m f c a n b e c o n n e c t e d b e t w e e n v c c a n d g r o u n d p i n . i n d u c t o r s e l e c t i o n t h e i n d u c t a n c e o f t h e i n d u c t o r i s d e t e r m i n e d b y t h e o u t - p u t v o l t a g e r e q u i r e m e n t . t h e l a r g e r t h e i n d u c t a n c e , t h e l o w e r t h e i n d u c t o r ? s c u r r e n t r i p p l e . t h i s w i l l t r a n s l a t e i n t o l o w e r o u t p u t r i p p l e v o l t a g e . t h e r i p p l e c u r r e n t a n d r i p p l e v o l t a g e c a n b e a p p r o x i m a t e d b y : i r i p p l e = v i n - v o u t f s x l v o u t v i n x d v o u t = i r i p p l e x e s r w h e r e f s i s t h e s w i t c h i n g f r e q u e n c y o f t h e r e g u l a t o r . t h e r e i s a t r a d e o f f e x i s t s b e t w e e n t h e i n d u c t o r ? s r i p p l e c u r r e n t a n d t h e r e g u l a t o r l o a d t r a n s i e n t r e s p o n s e t i m e . a s m a l l e r i n d u c t o r w i l l g i v e t h e r e g u l a t o r a f a s t e r l o a d t r a n - s i e n t r e s p o n s e a t t h e e x p e n s e o f h i g h e r r i p p l e c u r r e n t a n d v i c e v e r s a . t h e m a x i m u m r i p p l e c u r r e n t o c c u r s a t t h e m a x i m u m i n - p u t v o l t a g e . a g o o d s t a r t i n g p o i n t i s t o c h o o s e t h e r i p p l e c u r r e n t t o b e a p p r o x i m a t e l y 3 0 % o f t h e m a x i m u m o u t p u t c u r r e n t . o n c e t h e i n d u c t a n c e v a l u e h a s b e e n c h o s e n , s e l e c t a n i n d u c t o r t h a t i s c a p a b l e o f c a r r y i n g t h e r e q u i r e d p e a k c u r - r e n t w i t h o u t g o i n g i n t o s a t u r a t i o n . i n s o m e t y p e s o f i n d u c t o r s , e s p e c i a l l y c o r e t h a t i s m a k e o f f e r r i t e , t h e r i p p l e c u r r e n t w i l l i n c r e a s e a b r u p t l y w h e n i t s a t u r a t e s . t h i s w i l l r e s u l t i n a l a r g e r o u t p u t r i p p l e v o l t a g e . m o s f e t s e l e c t i o n t h e s e l e c t i o n o f t h e n - c h a n n e l p o w e r m o s f e t s a r e d e - t e r m i n e d b y t h e r d s ( o n ) , r e v e r s e t r a n s f e r c a p a c i t a n c e ( c r s s ) a n d m a x i m u m o u t p u t c u r r e n t r e q u i r e m e n t . t h e l o s s e s i n t h e m o s f e t s h a v e t w o c o m p o n e n t s : c o n d u c t i o n l o s s a n d t r a n s i t i o n l o s s . f o r t h e u p p e r a n d l o w e r m o s f e t , t h e l o s s e s a r e a p p r o x i m a t e l y g i v e n b y t h e f o l l o w i n g e q u a t i o n s : p u p p e r = i o u t ( 1 + t c ) ( r d s ( o n ) ) d + ( 0 . 5 ) ( i o u t ) ( v i n ) ( t s w ) f s p l o w e r = i o u t ( 1 + t c ) ( r d s ( o n ) ) ( 1 - d ) w h e r e i o u t i s t h e l o a d c u r r e n t t c i s t h e t e m p e r a t u r e d e p e n d e n c y o f r d s ( o n ) f s i s t h e s w i t c h i n g f r e q u e n c y t s w i s t h e s w i t c h i n g i n t e r v a l d i s t h e d u t y c y c l e n o t e t h a t b o t h m o s f e t s h a v e c o n d u c t i o n l o s s e s w h i l e t h e u p p e r m o s f e t i n c l u d e s a n a d d i t i o n a l t r a n s i t i o n l o s s . t h e s w i t c h i n g i n t e r n a l , t s w , i s t h e f u n c t i o n o f t h e r e v e r s e t r a n s f e r c a p a c i t a n c e c r s s . f i g u r e 3 i l l u s t r a t e s t h e s w i t c h - i n g w a v e f o r m i n t e r n a l o f t h e m o s f e t . l a y o u t c o n s i d e r a t i o n i n h i g h p o w e r s w i t c h i n g r e g u l a t o r , a c o r r e c t l a y o u t i s i m - p o r t a n t t o e n s u r e p r o p e r o p e r a t i o n o f t h e r e g u l a t o r . i n g e n e r a l , i n t e r c o n n e c t i n g i m p e d a n c e s s h o u l d b e m i n i - m i z e d b y u s i n g s h o r t , w i d e p r i n t e d c i r c u i t t r a c e s . s i g n a l a n d p o w e r g r o u n d s a r e t o b e k e p t s e p a r a t e a n d f i n a l l y c o m b i n e d u s i n g g r o u n d p l a n e c o n s t r u c t i o n o r s i n g l e p o i n t g r o u n d i n g . f i g u r e 4 i l l u s t r a t e s t h e l a y o u t , w i t h b o l d l i n e s i n d i c a t i n g h i g h c u r r e n t p a t h s . c o m p o n e n t s a l o n g t h e b o l d l i n e s s h o u l d b e p l a c e d c l o s e t o g e t h e r .
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 . 5 - j u n . , 2 0 0 8 a p w 7 0 5 7 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 b e l o w i s a c h e c k l i s t f o r y o u r l a y o u t : k e e p t h e s w i t c h i n g n o d e s ( u g a t e , l g a t e , a n d p h a s e ) a w a y f r o m s e n s i t i v e s m a l l s i g n a l n o d e s s i n c e t h e s e n o d e s a r e f a s t m o v i n g s i g n a l s . t h e r e f o r e , k e e p t r a c e s t o t h e s e n o d e s a s s h o r t a s p o s s i b l e . d e c o u p l i n g c a p a c i t o r c i n p r o v i d e s t h e b u l k c a p a c i t a n c e a n d n e e d s t o b e p l a c e d c l o s e t o t h e i c s i n c e i t w i l l p r o v i d e t h e m o s f e t d r i v e r s t r a n s i e n t c u r r e n t r e q u i r e m e n t . t h e g r o u n d r e t u r n o f c i n m u s t r e t u r n t o t h e c o m b i n e c o u t ( - ) t e r m i n a l . c a p a c i t o r c b o o t s h o u l d b e c o n n e c t e d a s c l o s e t o t h e b o o t a n d p h a s e p i n s a s p o s s i b l e . c a p a c i t o r c h f i s t o i m p r o v e n o i s e p e r f o r m a n c e a n d a s m a l l 1 m f c e r a m i c c a p a c i t o r w i l l b e s u f f i c i e n t . l a y o u t c o n s i d e r a t i o n ( c o n t . ) v o l t a g e a c r o s s d r a i n a n d s o u r c e o f m o s f e t time v ds t sw figure 3. switching waveform across mosfet v in v out q1 l1 4 8 2 u 1 1 5 c out c in figure 4. recommended layout diagram + + apw7057 ugate lgate vcc phase boot c hf q2
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 . 5 - j u n . , 2 0 0 8 a p w 7 0 5 7 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 s o p - 8 s y m b o l min. max. 1.75 0.10 0.17 0.25 0.25 a a1 c d e e1 e h l millimeters b 0.31 0.51 sop-8 0.25 0.50 0.40 1.27 min. max. inches 0.069 0.004 0.012 0.020 0.007 0.010 0.010 0.020 0.016 0.050 0 0.010 1.27 bsc 0.050 bsc a2 1.25 0.049 0 8 0 8 d e e e 1 see view a c b h x 4 5 a a 1 a 2 l view a 0 . 2 5 seating plane gauge plane note: 1. follow jedec ms-012 aa. 2. dimension ? d ? does not include mold flash, protrusions or gate burrs. mold flash, protrusion or gate burrs shall not exceed 6 mil per side. 3. dimension ? e ? does not include inter-lead flash or protrusions. inter-lead flash and protrusions shall not exceed 10 mil per side. 3.80 5.80 4.80 4.00 6.20 5.00 0.189 0.197 0.228 0.244 0.150 0.157
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 5 - j u n . , 2 0 0 8 a p w 7 0 5 7 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 330.0 ? 2.00 50 min. 12.4+2.00 - 0.00 13.0+0.50 - 0.20 1.5 min. 20.2 min. 12.0 ? 0.30 1.75 ? 0.10 5.5 ? 0.05 p 0 p1 p 2 d 0 d1 t a 0 b 0 k 0 sop - 8 4.0 ? 0.10 8.0 ? 0.10 2.0 ? 0.05 1.5+0.10 - 0.00 1.5 min. 0.6+0.00 - 0.40 6.40 ? 0.20 5.20 ? 0.20 2.10 ? 0.20 (mm) 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 sop - 8 tape & reel 2500 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 . 5 - j u n . , 2 0 0 8 a p w 7 0 5 7 w w w . a n p e c . c o m . t w 1 4 r e f l o w c o n d i t i o n ( i r / c o n v e c t i o n o r v p r r e f l o w ) c l a s s i f i c a t i o n r e f l o w p r o f i l e s profile feature sn - pb eutectic assembly pb - free assembly average ramp - up rate (t l to t p ) 3 c/second max. 3 c/second max. preheat - temperature min (tsmin) - temperature max (tsmax) - time (min to max) (ts) 100 c 150 c 60 - 120 seconds 150 c 200 c 60 - 180 seconds time maintained above: - temperature (t l ) - time (t l ) 183 c 60 - 150 seconds 217 c 60 - 150 seconds peak /classification temperature (tp) see table 1 see table 2 time within 5 c of actual peak temperature (tp) 10 - 30 seconds 20 - 40 seconds ramp - down rate 6 c/sec ond max. 6 c/second max. time 25 c to peak temperature 6 minutes max. 8 minutes max. notes: all temperatures refer to topside of the package. measured on the body surface. test item method description solderability mil - std - 883d - 2003 245 c, 5 sec holt mil - std - 883d - 1005.7 1000 hrs bias @125 c pct jesd - 22 - b, a102 168 hrs, 100 % rh, 121 c tst mil - std - 883d - 1011.9 - 65 c~150 c, 200 cycles esd mil - std - 883d - 3015.7 vhbm > 2kv, vmm > 200v latch - up jesd 78 10ms, 1 tr > 100ma r e l i a b i l i t y t e s t p r o g r a m t 25 c to peak tp ramp-up t l ramp-down ts preheat tsmax tsmin t l t p 25 t e m p e r a t u r e time critical zone t l to t p
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 5 - j u n . , 2 0 0 8 a p w 7 0 5 7 w w w . a n p e c . c o m . t w 1 5 table 2. pb - free process ? package classification reflow temperatures package thickness volume mm 3 <350 volume mm 3 350 - 2000 volume mm 3 >2000 <1.6 mm 260 +0 c* 260 +0 c* 260 +0 c* 1.6 mm ? 2.5 mm 260 +0 c* 250 +0 c* 245 +0 c* 3 2.5 mm 250 +0 c* 245 +0 c* 245 +0 c* *tolerance: the device manufacturer/supplier shall assure process compatibility up to and including the stated classification temperature (this means peak reflow temperature +0 c. for example 260 c+0 c) at the rated msl level. table 1. snpb eutectic process ? package peak reflow temperature s package thickness volume mm 3 <350 volume mm 3 3 350 <2.5 mm 240 +0/ - 5 c 225 +0/ - 5 c 3 2.5 mm 225 +0/ - 5 c 225 +0/ - 5 c c l a s s i f i c a t i o n r e f l o w p r o f i l e s ( c o n t . ) c u s t o m e r s e r v i c e a n p e c e l e c t r o n i c s c o r p . head office : no.6, dusing 1st road, sbip, hsin-chu, taiwan tel : 886-3-5642000 fax : 886-3-5642050 t a i p e i b r a n c h : 2 f , n o . 1 1 , l a n e 2 1 8 , s e c 2 j h o n g s i n g r d . , s i n d i a n c i t y , t a i p e i c o u n t y 2 3 1 4 6 , t a i w a n t e l : 8 8 6 - 2 - 2 9 1 0 - 3 8 3 8 f a x : 8 8 6 - 2 - 2 9 1 7 - 3 8 3 8

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