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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 . 6 - n o v . , 2 0 1 0 a p w 7 1 4 2 w w w . a n p e c . c o m . t w 1 a n p e c r e s e r v e s t h e r i g h t t o m a k e c h a n g e s t o i m p r o v e r e l i a b i l i t y o r m a n u f a c t u r a b i l i t y w i t h o u t n o t i c e , a n d a d v i s e c u s t o m e r s t o o b t a i n t h e l a t e s t v e r s i o n o f r e l e v a n t i n f o r m a t i o n t o v e r i f y b e f o r e p l a c i n g o r d e r s . 3 a , 1 2 v , s y n c h r o n o u s - r e c t i f i e d b u c k c o n v e r t e r f e a t u r e s g e n e r a l d e s c r i p t i o n w i d e i n p u t v o l t a g e f r o m 4 . 3 v t o 1 4 v o u t p u t c u r r e n t u p t o 3 a adjustable output voltage from 0.8v to v in - 2% system accuracy 7 0 m w i n t e g r a t e d p o w e r m o s f e t s h i g h e f f i c i e n c y u p t o 9 5 % - automatic skip/pwm mode operation c u r r e n t - m o d e o p e r a t i o n - e a s y f e e d b a c k c o m p e n s a t i o n - s t a b l e w i t h l o w e s r o u t p u t c a p a c i t o r s - f a s t l o a d / l i n e t r a n s i e n t r e s p o n s e p o w e r - o n - r e s e t m o n i t o r i n g f i x e d 5 0 0 k h z s w i t c h i n g f r e q u e n c y i n p w m m o d e b u i l t - i n d i g i t a l s o f t - s t a r t a n d s o f t - s t o p c u r r e n t - l i m i t p r o t e c t i o n w i t h f r e q u e n c y f o l d b a c k 1 2 3 % o v e r - v o l t a g e p r o t e c t i o n h i c c u p - m o d e 5 0 % u n d e r - v o l t a g e p r o t e c t i o n 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 < 3 m a q u i e s c e n t c u r r e n t i n s h u t d o w n m o d e s m a l l s o p - 8 p a c k a g e lead free and green devices available (rohs compliant) a p p l i c a t i o n s o l p c , u m p c n o t e b o o k c o m p u t e r h a n d h e l d p o r t a b l e d e v i c e step-down converters requiring high efficiency and 3a output current o u t p u t c u r r e n t , i o u t ( a ) efficiency (%) for high efficiency over all load current range, the APW7142 is equipped with an automatic skip/pwm mode operation. at light load, the ic operates in the skip mode, which keeps a constant minimum inductor peak current, to reduce switching losses. at heavy load, the ic works in pwm mode, which inductor peak current is programmed by the comp voltage, to provide high efficiency and excel- lent output voltage regulation. the ap w7142 is also equipped with powe r-on-reset, soft-start, soft-stop, and whole protections (under-voltage, over-voltage, over-temperature, and current-limit) into a single package. in shutdown mode, the supply current drops below 3 m a. this device, available in a 8-pin sop-8 package, pro- vides a very compact system solution with minimal exter- nal components and pcb area. the APW7142 is a 3a synchronous-rectified buck con- verter with integrated 70m w power mosfets. the APW7142, designed with a current-mode control scheme, can convert wide input voltage of 4.3v to 14v to the output voltage adjustable from 0.8v to vin to provide excellent output voltage regulation. 0 10 20 30 40 50 60 70 80 90 100 0.001 0.01 0.1 1 10 v in =12v, v out =3.3v, l1=4.7 m f v in =12v, v out =5v, l1=6.8 m f v in =5v, v out =3.3v, l1=2.2 m f
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 . 6 - n o v . , 2 0 1 0 a p w 7 1 4 2 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 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 ) symbol parameter rating unit v in vin supply voltage (vin to agnd) - 0.3 ~ 1 5 v > 100ns - 1 ~ v in +1 v lx lx to gnd voltage < 100ns - 5 ~ v in +5 v pgnd to agnd voltage - 0.3 ~ +0.3 v en to agnd voltage - 0.3 ~ v in +0.3 v fb, comp to agnd voltage - 0.3 ~ 6 v p d power dissipation internally limited w maximum junction temperature 150 o c t stg storage temperature - 65 ~ 150 o c t sdr maximum lead soldering temperature, 10 seconds 260 o c n o t e 1 : a b s o l u t e m a x i m u m r a t i n g s a r e t h o s e v a l u e s b e y o n d w h i c h t h e l i f e o f a d e v i c e m a y b e i m p a i r e d . e x p o s u r e t o a b s o l u t e m a x i m u m r a t i n g c o n d i t i o n s f o r e x t e n d e d p e r i o d s m a y a f f e c t d e v i c e r e l i a b i l i t y . 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 thermal resistance in free air (note 2 ) sop - 8 80 o c/w note 2 : q ja is measured with the component mounted on a high effective thermal cond uctivity test board in free air. p i n c o n f i g u r 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 ) . APW7142 package code k : sop-8 operating junction temperature range i : -40 to 85 o c handling code tr : tape & reel assembly material g : halogen and lead free device handling code temperature range package code assembly material APW7142 k : xxxxx - date code APW7142 xxxxx 1 2 3 4 8 7 6 5 lx lx en comp pgnd vin agnd fb APW7142 sop-8 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 . 6 - n o v . , 2 0 1 0 a p w 7 1 4 2 w w w . a n p e c . c o m . t w 3 symbol parameter range unit v in vin supply voltage 4. 3 ~ 1 4 v v out converter output voltage 0.8 ~ v in v i out converter output current 0 ~ 3 a c in converter input capacitor (mlcc) 8 ~ 50 m f converter output capacitor 20 ~ 100 0 m f c out effective series resistance 0 ~ 60 m w l out converter output inductor 1 ~ 22 m h resistance of the feedback resistor connected from fb to gnd 1 ~ 20 k w t a ambient temperature - 40 ~ 85 o c t j junction temperature - 40 ~ 125 o c note 3: refer to the typical ap plication circuits 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 ) 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 APW7142 symbol parameter test conditions min . typ . max . unit supply current i vin vin supply current v fb = v ref +50mv , v en =3v, lx=nc - 0.5 1.5 ma i vin_sd vin shutdown supply current v en = 0v - - 3 m a power - on - reset (por) voltage threshold vi n por voltage threshold v in rising 3. 9 4.1 4. 3 v vin por hysteresis - 0.5 - v reference voltage v ref reference voltage regulated on fb pin - 0.8 - v t j = 25 o c, i out = 1 0 m a, v in =12v - 1.0 - +1.0 output voltage accuracy i out = 1 0 m a ~3a , v in = 4.7 5~14 v - 2.0 - +2.0 % line regulation v in = 4. 7 5v to 1 4 v - +0.02 - % /v load regulation i out = 0.5a ~ 3a - - 0.04 - % /a oscillator and duty cycle f osc oscillator frequency t j = - 40 ~ 125 o c, v in = 4. 7 5 ~ 1 4 v 450 500 550 k hz foldback frequency v ou t = 0v - 80 - k hz maximum converter?s duty - 99 - % t on_min minimum pulse width of lx - 1 5 0 - ns current - mode pwm converter gm error amplifier transconductance v fb =v ref 50mv - 200 - m a/v error amplifier dc gain comp = nc - 80 - db 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 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 = 1 2 v , v o u t = 3 . 3 v a n d t a = - 4 0 ~ 8 5 c , 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 y p i c a l v a l u e s a r e a t t a = 2 5 c .
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 6 - n o v . , 2 0 1 0 a p w 7 1 4 2 w w w . a n p e c . c o m . t w 4 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 . ) APW7142 symbol parameter test conditions min . typ . max . unit current - mode pwm converter (cont.) current - sense to comp voltage transresistance - 0.048 - v/a v in = 5v , t j =25c - 90 1 10 high - side switch resistance v in = 12v , t j =25c - 70 90 m w v in = 5v , t j =25c - 90 110 low - side switch resistance v in = 12v , t j =25c - 70 90 m w protections i lim high - s ide switch current - limit peak current 4.0 5.5 7.0 a v th_uv fb under - voltage threshold v fb falling 45 50 55 % v th_ov fb over - volt age threshold v fb rising 118 123 12 8 % f b under - voltage debounce - 1 - m s t otp over - temperature trip point - 150 - o c over - temperature hysteresis - 40 - o c t d dead - time v lx = - 0.7v - 20 - ns soft - start, soft - stop, enable and input current s t ss soft - start / soft - stop interval 1.5 2 2. 5 ms en logic low voltage v en falling - - 0.5 v en logic high voltage v en ris ing 2.1 - - v high - side switch leakage current v en = 0v, v lx = 0v - - 2 m a i fb fb pin input current - 100 - +100 na i en en pin input current v en = 0v ~ v in - 100 - +100 na 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 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 = 1 2 v , v o u t = 3 . 3 v a n d t a = - 4 0 ~ 8 5 c , 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 y p i c a l v a l u e s a r e a t t a = 2 5 c .
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 6 - n o v . , 2 0 1 0 a p w 7 1 4 2 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 vin input current vs. supply voltage s u p p l y v o l t a g e , v i n ( v ) vin input current, i vin (ma) c u r r e n t l i m i t l e v e l ( p e a k 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 , t j ( o c ) o u t p u t v o l t a g e v s . s u p p l y v o l t a g e s u p p l y v o l t a g e , v i n ( v ) o u t p u t c u r r e n t v s . e f f i c i e n c y o u t p u t v o l t a g e v s . o u t p u t c u r r e n t o u t p u t c u r r e n t , i o u t ( a ) o u t p u t c u r r e n t , i o u t ( a ) output voltage, v out (v) efficiency (%) output voltage, v out (v) current limit level, i lim (a) reference voltage, v ref (v) j u n c t i o n t e m p e r a t u r e , t j ( o c ) 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 (refer to the application circuit 1 in the section ?typical application circuits?, v in =12v, v out =3.3v, l1=4.7 m h) 0 10 20 30 40 50 60 70 80 90 100 0.001 0.01 0.1 1 10 v in =12v, v out =3.3v, l1=4.7 m f v in =12v, v out =5v, l1=6.8 m f v in =5v, v out =3.3v, l1=2.2 m f 3.2 3.22 3.24 3.26 3.28 3.3 3.32 3.34 3.36 3.38 3.4 0 1 2 3 4.5 5 5.5 6 6.5 7 -40 -20 0 20 40 60 80 100 120 140 4 6 8 10 12 14 i out =500ma 3.2 3.22 3.24 3.26 3.28 3.3 3.32 3.34 3.36 3.38 3.4 0.0 0.5 1.0 1.5 2.0 0 2 4 6 8 10 12 14 v fb =0.85v 0.784 0.788 0.792 0.796 0.800 0.804 0.808 0.812 0.816 -50 -25 0 25 50 75 100 125 150
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 . 6 - n o v . , 2 0 1 0 a p w 7 1 4 2 w w w . a n p e c . c o m . t w 6 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 ( c o n t . ) o s c i l l a t o r 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 oscillator frequency, f osc (khz) j u n c t i o n t e m p e r a t u r e , t j ( o c ) (refer to the application circuit 1 in the section ?typical application circuits?, v in =12v, v out =3.3v, l1=4.7 m h) 450 460 470 480 490 500 510 520 530 540 550 -50 -25 0 25 50 75 100 125 150
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 . 6 - n o v . , 2 0 1 0 a p w 7 1 4 2 w w w . a n p e c . c o m . t w 7 e n a b l e s h u t d o w n o p e r a t i n g w a v e f o r m s p o w e r o n p o w e r o f f (refer to the application circuit 1 in the section ?typical application circuits?, v in =12v, v out =3.3v, l1=4.7 m h) c h 1 : v i n , 5 v / d i v c h 2 : v o u t , 2 v / d i v c h 3 : i l 1 , 2 a / d i v t i m e : 1 m s / d i v 1 2 3 v in v out i l1 i out =3a c h 1 : v e n , 5 v / d i v c h 2 : v o u t , 2 v / d i v c h 3 : i l 1 , 2 a / d i v t i m e : 1 m s / d i v 1 2 3 v en v out i l1 i out =3a c h 1 : v i n , 5 v / d i v c h 2 : v o u t , 2 v / d i v c h 3 : i l 1 , 2 a / d i v t i m e : 1 0 m s / d i v 1 2 3 v in v out i l1 i out =3a c h 1 : v e n , 5 v / d i v c h 2 : v o u t , 2 v / d i v c h 3 : i l 1 , 2 a / d i v t i m e : 1 0 0 m s / d i v v en v out i l1 1 2 3 i out =3a
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 . 6 - n o v . , 2 0 1 0 a p w 7 1 4 2 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 ( c o n t . ) l o a d t r a n s i e n t r e s p o n s e l o a d t r a n s i e n t r e s p o n s e (refer to the application circuit 1 in the section ?typical application circuits?, v in =12v, v out =3.3v, l1=4.7 m h) s h o r t c i r c u i t s h o r t c i r c u i t c h 1 : v l x , 1 0 v / d i v c h 2 : v o u t , 2 v / d i v c h 3 : i l 1 , 5 a / d i v t i m e : 2 0 m s / d i v i out =3~7a v lx v out i l1 1 2 3 c h 1 : v l x , 5 v / d i v c h 2 : v o u t , 2 0 0 m v / d i v c h 3 : i l 1 , 5 a / d i v t i m e : 5 m s / d i v 1 2 3 v lx v out i l1 v out is shorted to gnd by a short wire c h 1 : v o u t , 2 0 0 m v / d i v c h 2 : i l 1 , 2 a / d i v t i m e : 1 0 0 m s / d i v v out i l1 1 2 i out = 50ma-> 3a ->50ma i out rising/falling time=10 m s c h 1 : v o u t , 1 0 0 m v / d i v c h 2 : i l 1 , 2 a / d i v t i m e : 1 0 0 m s / d i v i l1 v out 1 2 i out = 0.5a-> 3a ->0.5a i out rising/falling time=10 m s
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 . 6 - n o v . , 2 0 1 0 a p w 7 1 4 2 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 . ) l i n e t r a n s i e n t (refer to the application circuit 1 in the section ?typical application circuits?, v in =12v, v out =3.3v, l1=4.7 m h) s w i t c h i n g w a v e f o r m s w i t c h i n g w a v e f o r m o v e r - v o l t a g e p r o t e c t i o n c h 1 : v i n , 5 v / d i v c h 2 : v o u t , 2 v / d i v c h 3 : v l x , 5 v / d i v c h 4 : i l 1 , 5 a / d i v t i m e : 2 0 m s / d i v v in v out i l1 1 2 4 3 v lx i out =-1a c h 1 : v i n , 5 v / d i v c h 2 : v o u t , 5 0 m v / d i v ( v o f f s e t = 3 . 3 v ) c h 3 : i l 1 , 2 a / d i v t i m e : 1 0 0 m s / d i v v in v out i l1 1 2 3 v in = 5~12v v in rising/falling time=20 m s c h 1 : v l x , 5 v / d i v c h 2 : i l 1 , 2 a / d i v t i m e : 1 m s / d i v i l1 v lx i out = 0.2a 1 2 c h 1 : v l x , 5 v / d i v c h 2 : i l 1 , 2 a / d i v t i m e : 1 m s / d i v v lx i l1 i out = 3a 1 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 . 6 - n o v . , 2 0 1 0 a p w 7 1 4 2 w w w . a n p e c . c o m . t w 1 0 p i n d e s c r i p t i o n pin no. name function 1 pgnd power ground of the APW7142, which is the source of the n - channel power mosfet. connect this pin to system ground with lowest impedance. 2 vin power input. vin supplies the power (4. 3 v to 1 4 v) to the control circuitry, gat e drivers and step - down converter switches. connecting a ceramic bypass capacitor and a suitably large capacitor between vin and both of agnd and pgnd eliminates switching noise and voltage ripple on the input to the ic. 3 agnd ground of mosfet gate drive rs and control circuitry. 4 fb output feedback input. the APW7142 senses the feedback voltage via fb and regulate s the voltage at 0.8v. connecting fb with a resistor - divider from the converter?s output sets the output voltage from 0.8v to vin. 5 comp ou tput of the error amplifier. connect a series rc network from the comp to the gnd to compensate the regulation control loop. in some cases, an additional capacitor from the comp to the gnd is required. 6 en enable input. en is a digital input that turns t he regulator on or off. drive en high to turn on the regulator, drive it low to turn it off. connect this pin to the vin if it is not used. 7, 8 lx power switching output. lx is the junction of the high - side and low - side power mosfets to supply power to t he output lc filter. b l o c k d i a g r a m lx gate control v ref soft-start / soft-stop and fault logic error amplifier fb inhibit 50%v ref uvp pgnd por soft-start / soft-stop power-on- reset v in v in enable current sense amplifier en comp ovp 123%v ref oscillator 500khz slope compensation current compartor 1.5v vin over temperature protection zero-crossing comparator current limit fb ug lg gate driver gate driver agnd gm
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 . 6 - n o v . , 2 0 1 0 a p w 7 1 4 2 w w w . a n p e c . c o m . t w 1 1 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 1. 4.3~14v single power input step-down converter (with a ceramic output capacitor) a. cost-effective feedback compensation (c4 is not connected) b. fast-transient-response feedback compensation (c4 is connected) v in (v) v out (v) l1( m h) c2( m f) c2 esr(m w ) r1(k w ) r2(k w ) r3(k w ) c3(pf) 12 5 6.8 22 5 63.0 12 10.0 1500 12 5 6.8 44 3 63.0 12 20.0 1500 12 3.3 4.7 22 5 46.9 15 10.0 1500 12 3.3 4.7 44 3 46.9 15 22.0 1500 12 2 3.3 22 5 30.0 20 10.0 1500 12 2 3.3 44 3 30.0 20 20.0 1500 12 1.2 2.2 22 5 7.5 15 8.2 1800 12 1.2 2.2 44 3 7.5 15 16.0 1800 5 3.3 2.2 22 5 46.9 15 8.2 680 5 3.3 2.2 44 3 46.9 15 20.0 680 5 1.2 2.2 22 5 7.5 15 3.0 1800 5 1.2 2.2 44 3 7.5 15 7.5 1800 v in (v) v out (v) l1( m h) c2( m f) c2 esr(m w ) r1(k w ) r2(k w ) c4(pf) r3(k w ) c3(pf) 12 5 6.8 22 5 63.0 12 47 33.0 470 12 5 6.8 44 3 63.0 12 47 68.0 470 12 3.3 4.7 22 5 46.9 15 47 22.0 680 12 3.3 4.7 44 3 46.9 15 47 47.0 680 12 2 3.3 22 5 30.0 20 47 13.0 1200 12 2 3.3 44 3 30.0 20 47 27.0 1200 12 1.2 2.2 22 5 7.5 15 150 7.5 2200 12 1.2 2.2 44 3 7.5 15 150 15.0 2200 5 3.3 2.2 22 5 46.9 15 56 20.0 220 5 3.3 2.2 44 3 46.9 15 56 43.0 220 5 1.2 2.2 22 5 7.5 15 330 3.3 1800 5 1.2 2.2 44 3 7.5 15 330 8.2 1500 lx en 6 vin 2 agnd 3 comp 5 8 u1 APW7142 fb 4 v out l1 v in c1 lx 7 enable shutdown pgnd 1 c2 r1 ? 1% r2 ? 1% c4 ? 30%, optional r3 ? 5% c3 ? 30%
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 . 6 - n o v . , 2 0 1 0 a p w 7 1 4 2 w w w . a n p e c . c o m . t w 1 2 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 ( c o n t . ) 2. +12v single power input step-down converter (with an electrolytic output capacitor) lx en 6 vin 2 agnd 3 comp 5 8 u1 APW7142 fb 4 v out 3.3v/3a l1 4.7 m h /3a v in 12v c1 2.2 m f lx 7 enable shutdown pgnd 1 c2 470 m f (esr=30m w ) r1 46.9k ? 1% r2 15k ? 1% c4 47pf ? 30% r3 62k ? 5% c3 680pf ? 30% c5 470 m f
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 . 6 - n o v . , 2 0 1 0 a p w 7 1 4 2 w w w . a n p e c . c o m . t w 1 3 f u n c t i o n d e s c r i p t i o 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 ) t h e o v e r - v o l t a g e f u n c t i o 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 b y f b p i n . w h e n t h e f b v o l t a g e i n c r e a s e s o v e r 1 2 3 % o f t h e r e f e r e n c e v o l t a g e d u e t o t h e h i g h - s i d e m o s f e t f a i l u r e o r f o r o t h e r r e a s o n s , t h e o v e r - v o l t a g e p r o t e c t i o n c o m p a r a t o r w i l l f o r c e t h e l o w - s i d e m o s f e t g a t e d r i v e r h i g h . t h i s a c - t i o n a c t i v e l y p u l l s d o w n t h e o u t p u t v o l t a g e a n d e v e n t u a l l y a t t e m p t s t o b l o w t h e i n t e r n a l b o n d i n g w i r e s . a s s o o n a s t h e o u t p u t v o l t a g e i s w i t h i n r e g u l a t i o n , t h e o v p c o m p a r a - t o r i s d i s e n g a g e d . t h e c h i p w i l l r e s t o r e i t s n o r m a l o p e r a t i o n . t h i s o v p s c h e m e o n l y c l a m p s t h e v o l t a g e o v e r s h o o t , a n d d o e s n o t i n v e r t t h e o u t p u t v o l t a g e w h e n o t h e r w i s e a c t i v a t e d w i t h a c o n t i n u o u s l y h i g h o u t p u t f r o m l o w - s i d e m o s f e t d r i v e r - a c o m m o n p r o b l e m f o r o v p s c h e m e s w i t h a l a t c h . o v e r - t e m p e r a t u r e p r o t e c t i o n ( o t p ) t h e o v e r - t e m p e r a t u r e c i r c u i t l i m i t s t h e j u n c t i o n t e m p e r a - t u r e o f t h e a p w 7 1 4 2 . w h e n t h e j u n c t i o n t e m p e r a t u r e e x - c e e d s t j = + 1 5 0 o c , a t h e r m a l s e n s o r t u r n s o f f t h e b o t h p o w e r m o s f e t s , a l l o w i n g t h e d e v i c e s t o c o o l . t h e t h e r - m a l s e n s o r a l l o w s t h e c o n v e r t e r s t o s t a r t a s t a r t - u p p r o - c e s s a n d t o r e g u l a t e t h e o u t p u t v o l t a g e a g a i n a f t e r t h e j u n c t i o n t e m p e r a t u r e c o o l s b y 4 0 o c . t h e o t p i s d e s i g n e d w i t h a 4 0 o c h y s t e r e s i s t o l o w e r t h e a v e r a g e t j d u r i n g c o n t i n u o u s t h e r m a l o v e r l o a d c o n d i t i o n s , i n c r e a s i n g l i f e - t i m e o f t h e a p w 7 1 4 2 . 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 i n i t i a t e s a s o f t - s t o p p r o c e s s a n d t h e n p l a c e s t h e a p w 7 1 4 2 i n s h u t d o w n . w h e n i n s h u t d o w n , a f t e r t h e s o f t - s t o p p r o c e s s i s c o m p l e t e d , t h e i n t e r n a l p o w e r m o s f e t s t u r n o f f , a l l i n t e r n a l c i r c u i t r y s h u t s d o w n a n d t h e q u i e s c e n t s u p p l y c u r r e n t r e d u c e s t o l e s s t h a n 3 m a . v i n p o w e r - o n - r e s e t ( p o r ) t h e a p w 7 1 4 2 k e e p s m o n i t o r i n g t h e v o l t a g e o n v i n p i n t o p r e v e n t w r o n g l o g i c o p e r a t i o n s w h i c h m a y o c c u r w h e n v i n v o l t a g e i s n o t h i g h e n o u g h f o r t h e i n t e r n a l c o n t r o l c i r c u i t r y t o o p e r a t e . t h e v i n p o r h a s a r i s i n g t h r e s h o l d o f 4 . 1 v ( t y p i c a l ) w i t h 0 . 5 v o f h y s t e r e s i s . d u r i n g s t a r t u p , t h e v i n v o l t a g e m u s t e x c e e d t h e e n a b l e v o l t a g e t h r e s h o l d . t h e n , t h e i c s t a r t s a s t a r t - u p p r o c e s s a n d r a m p s u p t h e o u t p u t v o l t a g e t o t h e v o l t a g e t a r g e t . d i g i t a l s o f t - s t a r t t h e a p w 7 1 4 2 h a s a b u i l t - i n d i g i t a l s o f t - s t a r t t o c o n t r o l t h e r i s e r a t e o f t h e o u t p u t v o l t a g e a n d l i m i t t h e i n p u t c u r r e n t s u r g 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 v o l t - a g e r a m p ( v r a m p ) , c o n n e c t e d t o o n e o f t h e p o s i t i v e i n p u t s o f t h e e r r o r a m p l i f i e r , r i s e s u p f r o m 0 v t o 0 . 9 5 v t o r e p l a c e t h e r e f e r e n c e v o l t a g e ( 0 . 8 v ) u n t i l t h e v o l t a g e r a m p r e a c h e s t h e r e f e r e n c e v o l t a g e . d u r i n g s o f t - s t a r t w i t h o u t o u t p u t o v e r - v o l t a g e , t h e a p w 7 1 4 2 c o n v e r t e r ? s s i n k i n g c a p a b i l i t y i s d i s a b l e d u n t i l t h e o u t p u t v o l t a g e r e a c h e s t h e v o l t a g e t a r g e t . d i g i t a l s o f t - s t o p a t t h e m o m e n t o f s h u t d o w n c o n t r o l l e d b y e n s i g n a l , u n - d e r - v o l t a g e e v e n t o r o v e r - t e m p e r a t u r e p r o t e c t i o n , t h e a p w 7 1 4 2 i n i t i a t e s a d i g i t a l s o f t - s t o p p r o c e s s t o d i s c h a r g e t h e o u t p u t v o l t a g e i n t h e o u t p u t c a p a c i t o r s . c e r t a i n l y , t h e l o a d c u r r e n t a l s o d i s c h a r g e s t h e o u t p u t v o l t a g e . d u r i n g s o f t - s t o p , t h e i n t e r n a l v o l t a g e r a m p ( v r a m p ) f a l l s d o w n r i s e s f r o m 0 . 9 5 v t o 0 v t o r e p l a c e t h e r e f e r e n c e v o l t a g e . t h e r e f o r e , t h e o u t p u t v o l t a g e f a l l s d o w n s l o w l y a t t h e l i g h t l o a d . a f t e r t h e s o f t - s t o p i n t e r v a l e l a p s e s , t h e s o f t - s t o p p r o c e s s e n d s a n d t h e t h e i c t u r n s o n t h e l o w - s i d e p o w e r m o s f e t . o u t p u t u n d e r - v o l t a g e p r o t e c t i o n ( u v p ) i n t h e o p e r a t i o n a l p r o c e s s , i f a s h o r t - c i r c u i t o c c u r s , t h e o u t p u t v o l t a g e w i l l d r o p q u i c k l y . b e f o r e t h e c u r r e n t - l i m i t c i r c u i t r e s p o n d s , t h e o u t p u t v o l t a g e w i l l f a l l o u t o f t h e r e - q u i r e d r e g u l a t i o n r a n g e . t h e u n d e r - v o l t a g e c o n t i n u a l l y m o n i t o r s t h e f b v o l t a g e a f t e r s o f t - s t a r t i s c o m p l e t e d . i f a l o a d s t e p i s s t r o n g e n o u g h t o p u l l t h e o u t p u t v o l t a g e l o w e r t h a n t h e u n d e r - v o l t a g e t h r e s h o l d , t h e i c s h u t s d o w n c o n v e r t e r ? s o u t p u t . t h e u n d e r - v o l t a g e t h r e s h o l d i s 5 0 % o f t h e n o m i n a l o u t - p u t v o l t a g e . t h e u n d e r - v o l t a g e c o m p a r a t o r h a s a b u i l t - i n 2 m s n o i s e f i l t e r t o p r e v e n t t h e c h i p s f r o m w r o n g u v p s h u t - d o w n b e i n g c a u s e d b y n o i s e . t h e u n d e r - v o l t a g e p r o t e c - t i o n w o r k s i n a h i c c u p m o d e w i t h o u t l a t c h e d s h u t d o w n . t h e i c w i l l i n i t i a t e a n e w s o f t - s t a r t p r o c e s s a t t h e e n d o f t h e p r e c e d i n g d e l a y .
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 . 6 - n o v . , 2 0 1 0 a p w 7 1 4 2 w w w . a n p e c . c o m . t w 1 4 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 4 2 m o n i t o r s t h e o u t p u t c u r r e n t , f l o w s t h r o u g h t h e h i g h - s i d e p o w e r 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 i c 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 o r s h o r t - c i r c u i t c o n d i t i o n s . f r e q u e n c y f o l d b a c k t h e f o l d b a c k f r e q u e n c y i s c o n t r o l l e d b y t h e f b v o l t a g e . w h e n t h e o u t p u t i s s h o r t e n e d t o t h e g r o u n d , t h e f r e q u e n c y o f t h e o s c i l l a t o r w i l l b e r e d u c e d t o 8 0 k h z . t h i s l o w e r f r e - q u e n c y a l l o w s t h e i n d u c t o r c u r r e n t t o s a f e l y d i s c h a r g e , t h e r e b y p r e v e n t i n g c u r r e n t r u n a w a y . t h e o s c i l l a t o r ? s f r e - q u e n c y w i l l g r a d u a l l y i n c r e a s e t o i t s d e s i g n e d r a t e w h e n t h e f e e d b a c k v o l t a g e o n t h e f b a g a i n a p p r o a c h e s 0 . 8 v . f u n c t i o n d e s c r i p t i o n ( 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 . 6 - n o v . , 2 0 1 0 a p w 7 1 4 2 w w w . a n p e c . c o m . t w 1 5 a p p l i c a t i o n i n f o r m a t i o n f i g u r e 1 c o n v e r t e r w a v e f o r m s . . . . . . . . . . . ( 1 ) . . . . . . . . . . . ( 2 ) l f d) - (1 v i osc out = d v in v out c in c out l q1 lx esr i l i out i q1 i cout vin q2 i out v lx t=1/f osc i l i q1 i cout i out i i dt v out v out v v d in out = . . . . . . . . . . . ( 3 ) esr . i v esr d = (v) c f 8 i v out osc cout d = d . . . . . . . . . . . ( 4 ) (v) esr i v out d = d . . . . . . . . . . . ( 5 ) s e t t i n g o u t p u t v o l t a g e t h e r e g u l a t e d 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) ) r r (1 0.8 v 2 1 out + = s u g g e s t e d r 2 i s i n t h e r a n g e f r o m 1 k t o 2 0 k w . f o r p o r - t a b l e a p p l i c a t i o n s , a 1 0 k r e s i s t o r i s s u g g e s t e d f o r r 2 . t o p r e v e n t s t r a y p i c k u p , p l e a s e l o c a t e r e s i s t o r s r 1 a n d r 2 c l o s e t o a p w 7 1 4 2 . i n p u t c a p a c i t o r s e l e c t i o n u s e s m a l l c e r a m i c c a p a c i t o r s 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 n d b u l k c a p a c i t o r s t o s u p p l y t h e s u r g e c u r - r e n t n e e d e d e a c h t i m e t h e p - c h a n n e l p o w e r m o s f e t ( q 1 ) t u r n s o n . p l a c e t h e s m a l l c e r a m i c c a p a c i t o r s p h y s i c a l l y c l o s e t o t h e v i n a n d b e t w e e n t h e v i n a n d t h e g n d . t h e i m p o r t a n t p a r a m e t e r s f o r t h e b u l k i n p u t c a p a c i t o r a r e 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 b u l k c a p a c i t o r w i t h v o l t a g e a n d c u r - r e n t r a t i n g s a b o v e t h e m a x i m u m i n p u t v o l t a g e a n d l a r g - e s t r m s c u r r e n t r e q u i r e d b y t h e c i r c u i 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 s h o u l d b e a t l e a s t 1 . 2 5 t i m e s g r e a t 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 a n d a v o l t a g e r a t i n g o f 1 . 5 t i m e s i s a c o n s e r v a t i v e g u i d e l i n e . t h e r m s c u r r e n t ( i r m s ) o f t h e b u l k i n p u t c a p a c i t o r 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 : w h e r e d i s t h e d u t y c y c l e o f t h e p o w e r m o s f e t . f o r a t h r o u g h h o l e d e s i g n , s e v e r a l e l e c t r o l y t i c c a p a c i t o r s m a y b e n e e d e d . f o r s u r f a c e m o u n t d e s i g n s , s o l i d t a n t a - l u m c a p a c i t o r s c a n b e u s e d , b u t c a u t i o n m u s t b e e x e r - c i s e d w i t h r e g a r d t o t h e c a p a c i t o r s u r g e c u r r e n t r a t i n g . o u t p u t c a p a c i t o r s e l e c t i o n a n o u t p u t c a p a c i t o r i s r e q u i r e d t o f i l t e r t h e o u t p u t a n d s u p - p l y t h e l o a d t r a n s i e n t c u r r e n t . t h e f i l t e r i n g r e q u i r e m e n t s a r e t h e f u n c t i o n o f t h e s w i t c h i n g f r e q u e n c y a n d t h e r i p p l e c u r r e n t ( d i ) . 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 , h a v i n g p h a s e s h i f t , 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 . t h e p e a k - t o - p e a k v o l t a g e o f t h e e s r 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 s : (a) d) - (1 d i i out rms = t h e p e a k - t o - p e a k v o l t a g e o f t h e i d e a l o u t p u t c a p a c i t o r 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 s : f o r t h e a p p l i c a t i o n s u s i n g b u l k c a p a c i t o r s , t h e d v c o u t i s m u c h s m a l l e r t h a n t h e v e s r a n d c a n b e i g n o r e d . t h e r e f o r e , t h e a c p e a k - t o - p e a k o u t p u t v o l t a g e ( d v o u t ) i s s h o w n a s b e l o w :
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 . 6 - n o v . , 2 0 1 0 a p w 7 1 4 2 w w w . a n p e c . c o m . t w 1 6 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 . ) w h e r e i n d u c t o r v a l u e c a l c u l a t i o n . . . . . . . . . . . ( 6 ) in(max) in v v = 1.2 v l 500000 ) v - (v v in out in out (h) v 600000 ) v - (v v l in out in out 3 f o r t h e a p p l i c a t i o n s u s i n g c e r a m i c c a p a c i t o r s , t h e v e s r i s m u c h s m a l l e r t h a n t h e d v c o u t a n d c a n b e i g n o r e d . t h e r e f o r e , t h e a c p e a k - t o - p e a k o u t p u t v o l t a g e ( d v o u t ) i s c l o s e t o d v c o u t . t h e l o a d t r a n s i e n t r e q u i r e m e n t s a r e t h e f u n c t i o n o f t h e s l e w r a t e ( d i / d t ) a n d t h e m a g n i t u d e o f t h e t r a n s i e n t l o a d c u r r e n t . t h e s e r e q u i r e m e n t s a r e g e n e r a l l y m e t w i t h a m i x o f c a p a c i t o r s a n d c a r e f u l l a y o u t . h i g h f r e q u e n c y c a p a c i - t o r s i n i t i a l l y s u p p l y t h e t r a n s i e n t a n d s l o w t h e c u r r e n t l o a d r a t e s e e n b y t h e b u l k c a p a c i t o r s . t h e b u l k f i l t e r c a p a c i t o r v a l u e s a r e g e n e r a l l y d e t e r m i n e d b y t h e e s r ( 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 ) a n d v o l t a g e r a t i n g r e q u i r e m e n t s r a t h e r t h a n 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 s . h i g h f r e q u e n c y d e c o u p l i n g c a p a c i t o r s s h o u l d b e p l a c e d a s c l o s e t o t h e p o w e r p i n s o f t h e l o a d a s p h y s i c a l l y p o s s i b l e . b e c a r e f u l n o t t o a d d i n d u c t a n c e i n t h e c i r c u i t b o a r d w i r i n g t h a t c o u l d c a n c e l t h e u s e f u l n e s s o f t h e s e l o w i n d u c t a n c e c o m p o n e n t s . a n a l u m i n u m e l e c t r o l y t i c c a p a c i t o r ? s e s r v a l u e i s r e l a t e d t o t h e c a s e s i z e w i t h l o w e r e s r a v a i l a b l e i n l a r g e r c a s e s i z e s . h o w e v e r , t h e e q u i v a - l e n t s e r i e s i n d u c t a n c e ( e s l ) o f t h e s e c a p a c i t o r s i n c r e a s e s w i t h c a s e s i z e a n d c a n r e d u c e t h e u s e f u l n e s s o f t h e c a - p a c i t o r t o t h e h i g h s l e w - r a t e t r a n s i e n t l o a d i n g . t h e o p e r a t i n g f r e q u e n c y a n d i n d u c t o r s e l e c t i o n a r e i n t e r - r e l a t e d i n t h a t h i g h e r o p e r a t i n g f r e q u e n c i e s p e r m i t t h e u s e o f a s m a l l e r i n d u c t o r f o r t h e s a m e a m o u n t o f i n d u c t o r r i p p l e c u r r e n t . h o w e v e r , t h i s i s a t t h e e x p e n s e o f e f f i c i e n c y d u e t o a n i n c r e a s e i n m o s f e t g a t e c h a r g e l o s s e s . t h e e q u a t i o n ( 2 ) s h o w s t h a t t h e i n d u c t a n c e v a l u e h a s a d i r e c t e f f e c t o n r i p p l e c u r r e n t . a c c e p t i n g l a r g e r v a l u e s o f r i p p l e c u r r e n t a l l o w s t h e u s e o f l o w i n d u c t a n c e s , b u t r e s u l t s i n h i g h e r o u t p u t v o l t a g e r i p p l e a n d g r e a t e r c o r e l o s s e s . a r e a s o n a b l e s t a r t i n g p o i n t f o r s e t t i n g r i p p l e c u r r e n t i s d i 0 . 4 x i o u t ( m a x ) . r e m e m b e r , 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 . t h e m i n i m u m 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 c a l - c u l a t e d b y u s i n g t h e f o l l o w i n g e q u a t i o n : layout consideration 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 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 a n d 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 i n g a n d f i n a l l y c o m - b i n e d u s i n g t h e 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 2 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 . t h e f o l l o w i n g 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 : f i r s t l y , t o i n i t i a l t h e l a y o u t b y p l a c i n g t h e p o w e r c o m p o n e n t s . o r i e n t t h e p o w e r c i r c u i t r y t o a c h i e v e a c l e a n p o w e r f l o w p a t h . i f p o s s i b l e , m a k e a l l t h e c o n - n e c t i o n s o n o n e s i d e o f t h e p c b w i t h w i d e a n d c o p p e r f i l l e d a r e a s . lx en 6 vin 2 agnd 3 comp 5 8 u 1 APW7142 fb 4 c 3 r 3 r 1 lx 7 pgnd 1 r 2 l 1 c 2 load + v out - c 1 + v in - feedback divider c4 (optional) compensation network i n f i g u r e 2 , t h e l o o p s w i t h t h e s a m e c o l o r b o l d l i n e s c o n d u c t h i g h s l e w r a t e c u r r e n t . t h e s e 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 w i d e a n d s h o r t p r i n t e d c i r c u i t t r a c e s . k e e p t h e 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 ( f b , c o m p ) a w a y f r o m s w i t c h i n g n o d e s ( l x o r o t h e r s ) o n t h e p c b . t h e r e f o r e p l a c e t h e f e e d b a c k d i v i d e r a n d t h e f e e d b a c k c o m p e n s a t i o n n e t w o r k c l o s e t o t h e i c t o a v o i d s w i t c h - i n g n o i s e . c o n n e c t t h e g r o u n d o f f e e d b a c k d i v i d e r d i - r e c t l y t o t h e a g n d p i n o f t h e i c u s i n g a d e d i c a t e d g r o u n d t r a c e . 1. 2. 3.
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 6 - n o v . , 2 0 1 0 a p w 7 1 4 2 w w w . a n p e c . c o m . t w 1 7 p l a c e t h e d e c o u p l i n g c e r a m i c c a p a c i t o r c 1 n e a r t h e v i n a s c l o s e a s p o s s i b l e . u s e a w i d e p o w e r g r o u n d p l a n e t o c o n n e c t t h e c 1 a n d c 2 t o p r o v i d e a l o w i m - p e d a n c e p a t h b e t w e e n t h e c o m p o n e n t s f o r l a r g e a n d h i g h s l e w r a t e c u r r e n t . f i g u r e 3 r e c o m m e n d e d l a y o u t d i a g r a m c1 l1 c2 v out v lx s o p - 8 APW7142 v in ground ground 1 2 3 4 5 6 7 8 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 . ) 4. layout consideration (cont.)
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 . 6 - n o v . , 2 0 1 0 a p w 7 1 4 2 w w w . a n p e c . c o m . t w 1 8 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 . 6 - n o v . , 2 0 1 0 a p w 7 1 4 2 w w w . a n p e c . c o m . t w 1 9 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) d e v i c e s p e r u n i t 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 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 . 6 - n o v . , 2 0 1 0 a p w 7 1 4 2 w w w . a n p e c . c o m . t w 2 0 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 p - 8 user direction of feed c l a s s i f i c a t i o n p r o f i l e
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 6 - n o v . , 2 0 1 0 a p w 7 1 4 2 w w w . a n p e c . c o m . t w 2 1 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 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. 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 @ tj=125 c pct jesd - 22, a102 168 hrs, 100%rh, 2atm , 121 c tct jesd - 22, a104 500 cycles, - 65 c~150 c esd mil - std - 883 - 3015.7 vhbm ? 2kv, vmm ? 200v latc h - 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 . 6 - n o v . , 2 0 1 0 a p w 7 1 4 2 w w w . a n p e c . c o m . t w 2 2 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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