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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 . 7 - n o v . , 2 0 1 2 a p w 7 2 0 7 / a 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 w h i t e l e d s t h e a p w 7 2 0 7 / a 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 0.2v reference voltage fixed 1mhz switching frequency high efficiency up to 88% 100hz to 200khz pwm brightness control fre- quency open-led protection under-voltage lockout protection over-temperature protection <1 m a quiescent current during shutdown tsot-23-6a and tdfn2x2-8 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, and 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 f e e d b a c k v o l t a g e r e d u c e s p o w e r l o s s a n d a c h i e v e s 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 . t h e a p w 7 2 0 7 / a 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 2 0 7 / a i s a v a i l a b l e i n t s o t - 2 3 - 6 a a n d t d f n 2 x 2 - 8 p a c k a g e s . 4 en 6 vin gnd 2 5 ovp fb 3 lx 1 tsot-23-6a (top view) g n d 1 6 5 4 3 2 8 7 lx gnd nc fb vin en ovp gnd tdfn 2x2-8 top view gnd vin v out en lx fb ovp l 1 22 m h c 2 1 m f c 1 2 . 2 m f r 1 10 w v in off on up tp 10 wleds
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 . 7 - n o v . , 2 0 1 2 a p w 7 2 0 7 / a 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 ~ 4 2 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 note1: 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 devi ce at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. 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 t hermal r esistance . (note 2) tsot - 23 - 6a tdfn2x2 - 8 220 150 c /w note 2 : q ja is measured with the component mounted on a high effective thermal conductivity test board in free air. 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 note: anpec lead-free products contain molding compounds/die attach materials and 100% matte tin plate termination finish; which are fully compliant with rohs. anpec lead-free products meet or exceed the lead-free requirements of ipc/jedec j-std-020d for msl classification at lead-free peak reflow temperature. anpec defines ?green? to mean lead-free (rohs compliant) and halogen free (br or cl does not exceed 900ppm by weight in homogeneous material and total of br and cl does not exceed 1500ppm by weight). 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 42 v c in input capacitor 2.2 or higher m f c out output capacitor 0.47 or higher m f l1 inductor 6.8 ~ 22 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. apw 7207 ct : x - date code package code ct : tsot - 23 - 6 a qb : tdfn 2 x 2 - 8 operating ambient temperature range i : - 40 to 85 o c handling code tr : tape & reel assembly material g : halogen and lead free device w 07 x apw 7207 apw 7207 a handling code temperature range package code assembly material apw 7207 a ct : x - date code w 7 ax apw 7207 a qb : x - date code w 07 a 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 . 7 - n o v . , 2 0 1 2 a p w 7 2 0 7 / a 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 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 ~ 8 5 c u n l e s s o t h e r w i s e n o t e d . apw7 207/a 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 = 0.3v, no switching 70 100 130 a i dd2 fb = gnd, sw itching - 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. 25 2.48 v uvlo hysteresis voltage 50 100 150 mv reference and output voltages v ref regulated feedback voltage 190 200 210 mv i fb fb input curr ent - 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 1.2 w i lim power switch current limit 1.0 1.2 - a lx leakage current v en =0v, v lx =0v or 5v, v i n = 5v - 1 - 1 a d max lx maximu m duty cycle 92 95 98 % output over voltage protection apw7207 23 25 27 v v ovp over voltage threshold APW7207A 36 3 9 42 v ovp hysteresis 1 - 4 v ovp leakage current v ovp =24v - - 45 a enable and shutdown v ten high - level input voltage of en 1 - - v low - level input voltage of en - - 0.4 v en dimming minimum on - time v en =3v, pwm dimming frequency from 5k to 200khz - 0.6 - s 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 rising - 150 - c over - temperature protection hysteresis - 40 - 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 . 7 - n o v . , 2 0 1 2 a p w 7 2 0 7 / a 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 . 7 - n o v . , 2 0 1 2 a p w 7 2 0 7 / a 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 . 7 - n o v . , 2 0 1 2 a p w 7 2 0 7 / a 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 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. 2 v eamp comp i cmp slope compensation gate driver current sense amplifier error amplifier current limit soft- s tart p in tsot - 23 - 6a tdfn2x2 - 8 n ame f unction 1 8 lx switch pin . connect this pin to inductor/diode here. 2 1,6 gnd power and signal ground pin. 3 5 fb feedback pin . reference voltage is 0.2v. connect this pin to cathode of the lowest led and resistor (r1 ). calculate resistor value according to r1=0.2v/i led . 4 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 belo w 1 m a. do not leave this pin floating. 5 3 ovp over - voltage protection pin. ovp is connected to the output capacitor of the converter. 6 2 vin main s upply pin. must be closely decoupled to the gnd with a 2.2 m f or greater ceramic capacitor. - 7 nc no in ternal connection. - exposed pad gnd connect this pad to gnd.
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 . 7 - n o v . , 2 0 1 2 a p w 7 2 0 7 / a 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 4 . circuit for driving 27 wleds gnd vin v out en lx fb ovp l 1 10 m h c 2 10 m f c 1 10 m f r 1 1 . 1 v in 4 . 5 v ~ 6 v 9 strings total off on apw 720 7 / a w figure 3 . separate enable and pwm brightness control using a mosfet gnd vin v out en l x fb ovp l 1 10 m h c 2 10 m f c 1 10 m f r 1 5 . 1 v in apw 7207 / a 6 s 2 p wleds q 1 bss 138 r 2 100 k enable ( en ) pwm brightness control i led 1 i led 2 r 3 1 m duty = 100 % , i led 1 / 2 = 20 ma duty = 0 % , led off 100 hz ~ 2 00 k hz w w w figure 1 . typical 10 wleds application gnd vin v out en lx fb ovp l 1 22 m h c 2 1 m f c 1 2 . 2 m f r 1 10 w v in off on apw 720 7 / a up to 10 wleds figure 2 . brightness control using a pwm signal applies to en gnd vin v out e n lx fb ovp l 1 c 2 c 1 r 1 v in apw 720 7 / a duty = 100 % , i led = 20 ma duty = 0 % , led off 100 hz ~ 2 00 k hz 22 m h 2 . 2 m f 1 m f 10 w up to 10 wleds
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 . 7 - n o v . , 2 0 1 2 a p w 7 2 0 7 / a 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 7 / a 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 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 . 3 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 7 / a 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 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 7 / a 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 7 / a f r o m d a m a g e s d u r i n g o v e r l o a d o r s h o r t - c i r - c u i t c o n d i t i o n s . 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 apw7207/a. when the junction temperature exceeds 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 g r o u n d p l a c e s t h e a p w 7 2 0 7 / a 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 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 control using a pwm signal from 100hz to 200khz. 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 . 7 - n o v . , 2 0 1 2 a p w 7 2 0 7 / a 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 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 0 7 / a 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 . 7 - n o v . , 2 0 1 2 a p w 7 2 0 7 / a 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 . 2 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 v / r 1 recommended inductor selection designator manufacturer part number i nductance ( m h) max dcr ( w ) saturation current (a) dimensions l x w x h (mm 3 ) l1 gotrend gtsd - 53 - 100 10 0.09 1.3 5 x 5 x 3 recommended capacitor selection designator manufacturer part num ber capacitance ( m f) tc code rated voltage (v) case size c1 murata grm188 c70j22 5ke20 2.2 x7s 6.3 0603 c1 murata grm219c80j10 6ke39 10 x6s 6.3 0805 c2 murata grm21br71h10 5ka12 1.0 x7r 50 0805 c2 murata grm31cr61e10 6ka12 10 x5r 25 1206 recommended diode selection designator manufacturer part number maximum average forward rectified current ( a) maximum repetitive peak reverse voltage (v) case size d1 zowie mscd104 1.0 40 0805
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 . 7 - n o v . , 2 0 1 2 a p w 7 2 0 7 / a w w w . a n p e c . c o m . t w 1 1 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 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 . 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 . ) to anode of wleds from cathod of wleds via to ovp l 1 c 1 via to v ovp d 1 v en v in lx refer to fig . 1 fig 4 . apw 7207 / a layout suggestion r 1 c 2 v ovp g n d 1 6 5 4 3 2 8 7 lx gnd nc fb v in c 2 r 1 d 1 l 1 v ovp to anode of wleds from cathod of wleds via to v ovp v en c 1
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 . 7 - n o v . , 2 0 1 2 a p w 7 2 0 7 / a 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 . 7 - n o v . , 2 0 1 2 a p w 7 2 0 7 / a 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 t d f n 2 x 2 - 8 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 tdfn2x2-8 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 0.70 0.039 0.028 0.002 0.50 bsc 0.020 bsc 1.90 2.10 0.075 0.083 1.90 2.10 0.075 0.083 note : 1. followed from jedec mo-229 wccd-3. e l e 2 pin 1 cornar d2 e d a b a1 a3
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 . 7 - n o v . , 2 0 1 2 a p w 7 2 0 7 / a w w w . a n p e c . c o m . t w 1 4 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 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 ? 0.20 1.75 ? 0.10 3.50 ? 0.05 p 0 p1 p 2 d 0 d1 t a 0 b 0 k 0 tdfn2x2 - 8 4.0 ? 0.10 4.0 ? 0.10 2.0 ? 0.05 1.5+0.1 0 - 0.00 1.5 min. 0.6+0.00 - 0.4 3.35 min 3.35 min 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 - 8 tape & reel 3000 tsot - 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 . 7 - n o v . , 2 0 1 2 a p w 7 2 0 7 / a 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 aaax aaax aaax aaax aaax aaax aaax user direction of feed t s o t - 2 3 - 6 a t d f n 2 x 2 - 8 user direction of feed
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 . 7 - n o v . , 2 0 1 2 a p w 7 2 0 7 / a 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 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 . 7 - n o v . , 2 0 1 2 a p w 7 2 0 7 / a w w w . a n p e c . c o m . t w 1 7 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 @ 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, a115 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 . 7 - n o v . , 2 0 1 2 a p w 7 2 0 7 / a w w w . a n p e c . c o m . t w 1 8 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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