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c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 4 - s e p . , 2 0 1 2 a p w 7 2 3 6 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 . 5 m h z s t e p - u p c o n v e r t e r f o r w h i t e l e d s the apw7236 is a current-mode and fixed frequency boost converter with an integrated n-fet to drive white leds. the series connection allows the led current to be iden- tical for uniform brightness. its low on-resistance of nfet and low feedback voltage reduce power loss and achieve high efficiency. fast switching frequency(1.5mhz typical) allows using small-size inductor and both of input and output capacitors. an over voltage protection function, which monitors the output voltage via ovp pin, stops switching of the ic if the ovp voltage exceeds the over voltage threshold. an internal soft-start circuit eliminates the inrush current during start-up. the apw7236 also integrates under-voltage lockout, over- temperature protection, and current limit circuits to pro- tect the ic in abnormal conditions. the apw7236 is avail- able in a tsot-23-6a and tdfn2x2-8 package. f e a t u r e s wide input voltage from 2.7v to 6v fixed 1.5mhz switching frequency reference voltage : 0.2v pwm brightness control with wide frequency range of 100hz to 100khz build-in power mosfet : 0.2 w open-led protection under-voltage lockout protection over-temperature protection <1 m a quiescent current during shutdown tsot-23-6a and tdfn2x2-8 package halogen and lead free available (rohs compliant) a p p l i c a t i o n s g e n e r a l d e s c r i p t i o n white led display backlighting cell phone and smart phone pda, pmp, mp3 digital camera s i m p l i f i e d a p p l i c a t i o n c i r c u i t p i n c o n f i g u r a t i o n tdfn 2 x 2 - 8 ( top view ) gnd 1 6 5 4 3 2 8 7 lx fb nc gnd vin en ovp gnd 4 en 6 vin gnd 2 5 ovp fb 3 lx 1 tsot - 23 - 6 a top view gnd vin v out en lx fb ovp l 1 4 . 7 m h c 2 4 . 7 m f c 1 4 . 7 m f r 1 v in 7 ~ 9 strings off on i led
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 4 - s e p . , 2 0 1 2 a p w 7 2 3 6 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 - 0.3 ~ v in v v lx lx to gnd voltage - 0.3 ~ 27.5 v v ovp ovp to gnd - 0.3 ~ 27.5 v p d power dissipation internally limit w t j maximum junction temperature 150 o c t stg storage temperature - 65 ~ 150 o c t sdr maximum lead soldering temperature , 10 seconds 26 0 o c a b s o l u t e m a x i m u m r a t i n g s ( n o t e 1 ) n o t e 1 : s t r e s s e s b e y o n d t h o s e l i s t e d u n d e r " a b s o l u t e m a x i m u m r a t i n g s " m a y c a u s e p e r m a n e n t d a m a g e t o t h e d e v i c e . t h e s e a r e s t r e s s r a t i n g s o n l y a n d f u n c t i o n a l o p e r a t i o n o f t h e d e v i c e a t t h e s e o r a n y o t h e r c o n d i t i o n s b e y o n d t h o s e i n d i c a t e d u n d e r " r e c o m - m e n d e d o p e r a t i n g c o n d i t i o n s " i s n o t i m p l i e d . e x p o s u r e t o a b s o l u t e m a x i m u m r a t i n g c o n d i t i o n s f o r e x t e n d e d p e r i o d s m a y a f f e c t d e v i c e r e l i a b i l i t y o r d e r i n g a n d m a r k i n g i n f o r m a t i o n n o t e : a n p e c l e a d - f r e e p r o d u c t s c o n t a i n m o l d i n g c o m p o u n d s / d i e a t t a c h m a t e r i a l s a n d 1 0 0 % m a t t e t i n p l a t e t e r m i n a t i o n f i n i s h ; w h i c h a r e f u l l y c o m p l i a n t w i t h r o h s . a n p e c l e a d - f r e e p r o d u c t s m e e t o r e x c e e d t h e l e a d - f r e e r e q u i r e m e n t s o f i p c / j e d e c j - s t d - 0 2 0 d f o r m s l c l a s s i f i c a t i o n a t l e a d - f r e e p e a k r e f l o w t e m p e r a t u r e . a n p e c d e f i n e s ? g r e e n ? t o m e a n l e a d - f r e e ( r o h s c o m p l i a n t ) a n d h a l o g e n f r e e ( b r o r c l d o e s n o t e x c e e d 9 0 0 p p m b y w e i g h t i n h o m o g e n e o u s m a t e r i a l a n d t o t a l o f b r a n d c l d o e s n o t e x c e e d 1 5 0 0 p p m b y w e i g h t ) . symbol parameter typical value unit q ja junction - to - ambient resistance in f ree a ir (note 2) tsot - 23 - 6a tdfn2x2 - 6 220 165 o c/w q jc junction - to - case resistance tsot - 23 - 6a tdfn2x2 - 6 120 20 o c/w note 2: q ja is measured with the component mounted on a high effective thermal conductivity test board in free air. t h e r m a l c h a r a c t e r i s t i c s apw 7236 handling code temperature range package code assembly material apw 7236 ct : y - over - voltage threshold code x - date code over - voltage threshold code a : 24 v b : 16 v package code ct : 6 lead tsot - 23 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 36 yx over - voltage threshold code apw 7236 qb : y - over - voltage threshold code x - date code 36 y 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 . 4 - s e p . , 2 0 1 2 a p w 7 2 3 6 w w w . a n p e c . c o m . t w 3 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 supply voltage (vin to gnd) 2.7 ~ 6 v v ovp vout to gnd v in ~ 22 v c in input capacitor 4.7~ m f c out output capacitor 4.7 ~ m f l1 converter output inductor 2.2 ~ 10 m h t a ambient temperature - 40 ~ 85 o c t j junction temperature - 4 0 ~ 125 o c n o t e 3 : 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 . e l e c t r i c a l c h a r a c t e r i s t i c s refer to figure 1 in the ?typical application circuits?. these specifications apply over v in = 3.6v, t a =25c. apw 7236 symbol parameter test conditions min . typ . max . unit supply current v in input voltage range 2.5 - 6 v i dd1 v fb = 0.4v, no switching - 300 - m a i dd2 v fb = gnd, switching - 2 5 ma i sd input dc bias current en=gnd - - 1 m a under - voltage lockout uvlo threshold voltage vin rising 2.0 2.2 2.4 v uvlo hysteresis voltage vin falling 50 100 150 mv reference and output voltage v in =2.7v~6v, t a = 25 o c 0.185 0.2 0.215 v v ref regulated feedback voltage apw7236a/b v in =2.7v~6v, t a = - 40 ~ 85 o c 0.18 - 0.22 v i fb fb input current - 50 - 50 na internal power switch and schottky diode f sw switching frequency 1.25 1.5 1.75 mhz r on power switch on resistance - 0.2 - w i lim power switch current limit - 2 - a lx leakage current v en = 0v, v lx = 0v or 6v, v in = 6v - 1 - 1 m a d max lx maximum duty cycle 92 95 98 %
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 4 - s e p . , 2 0 1 2 a p w 7 2 3 6 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 . ) apw 7236 symbol parameter test conditions min . typ . max . unit output over - voltage protection apw7236a 22 24 27.5 v over voltage threshold v out rising apw7236b 14.5 16 20 v over voltage hysteresis v ovp falling - 3 - v ovp leakage v ovp =20v - 50 - m a enable and shutdown enable voltage threshold v en rising 1 - - v shutdown voltage threshold v en falling - - 0.4 v en leakage current v en = 0 ~ 6v, v in = 6v - 2 - 2 m a en minimum on pluse width v en = 0 ~ 6v, v in = 6v, pwm dimmimg frequency=100hz t o 100khz - 800 - ns over - temperature protection t otp over - temperature protection (note 4) t j rising - 150 - o c over - temperature protection hysteresis (note 4) t j falling - 40 - o c n o t e 4 : g u a r a n t e e d b y d e s i g n , n o t p r o d u c t i o n t e s t e d . refer to figure 1 in the ?typical application circuits?. these specifications apply over v in = 3.6v, t a =25c.
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 4 - s e p . , 2 0 1 2 a p w 7 2 3 6 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 ( 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 , 6 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 ) supply voltage ( v ) supply voltage vs . efficiency e f f i c i e n c y ( % ) 0 20 40 60 80 100 2 . 7 3 3 . 3 3 . 6 3 . 9 4 . 2 4 . 5 4 . 8 5 . 1 l = 4 . 7 uh l = 10 uh en dimming duty cycle (%) w l e d c u r r e n t ( m a ) en dimming duty cycle vs . wled current 0 50 100 150 200 250 0 10 20 30 40 50 60 70 80 90 100 20 khz 50 khz 100 khz supply voltage ( v ) supply voltage vs . wled current w l e d c u r r e n t ( m a ) 190 195 200 205 210 2 . 7 3 . 2 3 . 7 4 . 2 4 . 7 5 . 2 m a x i m u m d u t y c y c l e ( % ) supply voltage vs . maximum duty cycle supply voltage ( v ) 40 50 60 70 80 90 100 2 2 . 5 3 3 . 5 4 4 . 5 5 5 . 5 6 supply voltage vs . switch on resistance s w i t c h o n r e s i s t a n c e ( ) supply voltage ( v ) 0 0 . 1 0 . 2 0 . 3 0 . 4 0 . 5 2 2 . 5 3 3 . 5 4 4 . 5 5 5 . 5 6
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 4 - s e p . , 2 0 1 2 a p w 7 2 3 6 w w w . a n p e c . c o m . t w 6 o p e r a t i n g w a v e f o r m s ( r e f e r t o t h e a p p l i c a t i o n c i r c u i t i n t h e s e c t i o n " t y p i c a l a p p l i c a t i o n c i r c u i t s " , v i n = 3 . 6 v , t a = 2 5 o c , 6 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 ) ch 1 : v en ( 2 v / div ) ch 2 : v ovp ( 5 v / div ) ch 3 : v lx ( 10 v / div ) ch 4 : i in ( 500 ma / div ) time : 1 m s / div en goes high - enable 1 4 2 3 en goes low - shutdown ch 1 : v en ( 2 v / div ) ch 2 : v ovp ( 5 v / div ) ch 3 : v lx ( 10 v / div ) ch 4 : i in ( 500 ma / div ) time : 10 m s / div 1 4 2 3 ch 1 : v ovp ( 5 v / div ) ch 2 : v lx ( 10 v / div ) ch 3 : i l ( 500 ma / div ) time : 10 m s / div open - led protection 3 2 1 normal operation ch 1 : v ovp ( 2 v / div ) ch 2 : v lx ( 10 v / div ) ch 3 : i l ( 500 ma / div ) time : 2 m s / div 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 . 4 - s e p . , 2 0 1 2 a p w 7 2 3 6 w w w . a n p e c . c o m . t w 7 b l o c k d i a g r a m uvlo oscillator control logic s vin en fb gnd lx ovp thermal shutdown v ref eamp comp i cmp soft - start p i n d e s c r i p t i o n pin no. tdfn2x2 - 8 tsot - 23 - 6a name f unction 1 , 5 2 gnd power and signal ground pin. 2 6 vin main supply pin. must be closely decoupled to gnd with a 4.7 m f or greater ceramic capacitor. 3 5 ovp converter output and over - voltage protection input pin. 4 4 en enable control input. forcing this pin above 1.0v enables the device, or forcing this pin below 0.4v to shut it down. in shutdown, all functions are disabled to decrease the supply current below 1 m a. do not leave this pin floating. 6 3 fb feedback pin. connect this pin to cathode of the lowest led and current - sense resistor (r1). calculate resistor value according to r1=v ref /i led . 7 - nc no internal connection. 8 1 lx switch pin. connect this pin to inductor/diode here. exposed pad - gnd connect ing 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 . 4 - s e p . , 2 0 1 2 a p w 7 2 3 6 w w w . a n p e c . c o m . t w 8 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 gnd vin v out en lx fb ovp l 1 4 . 7 m h c 2 4 . 7 m f c 1 4 . 7 m f r 1 v in 7 ~ 13 strings off on i led gnd vin v out en lx fb ovp l 1 4 . 7 m h c 2 4 . 7 m f c 1 4 . 7 m f r 1 v in up to 6 strings off on i led
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 4 - s e p . , 2 0 1 2 a p w 7 2 3 6 w w w . a n p e c . c o m . t w 9 f u n c t i o n d e s c r i p t i o n main control loop the apw7236 is a constant frequency current-mode switching regulator. during normal operation, the inter- nal n-channel power mosfet is turned on each cycle when the oscillator sets an internal rs latch and turned off when an internal comparator (icmp) resets the latch. the peak inductor current at which icmp resets the rs latch is controlled by the voltage on the comp node, which is the output of the error amplifier (eamp). an external current-sense resistor connected between cathode of the lowest led and ground allows the eamp to receive a current feedback voltage v fb at fb pin. when the leds voltage decreases to cause the leds current to decrease, it causes a slightly decrease in v fb relative to the refer- ence voltage, which in turn causes the comp voltage to increase until the leds current reaches the set point. vin under-voltage lockout (uvlo) the under-voltage lockout (uvlo) circuit compares the input voltage at vin with the uvlo threshold (2.2v rising, typical) to ensure the input voltage is high enough for reliable operation. the 100mv (typ) hysteresis prevents supply transients from causing a restart. once the input voltage exceeds the uvlo rising threshold, startup begins. when the input voltage falls below the uvlo falling threshold, the controller turns off the converter. soft-start the apw7236 has a built-in soft-start to control the n channel mosfet current raises during start-up. during soft-start, an internal ramp voltage connected to one of the inverting inputs of the current limit comparator. the inductor current limit is proportional to the voltage. when the threshold voltage of the internal soft-start comparator is reached, the full current limit is released. current-limit protection the apw7236 monitors the inductor current, flowing through the n-channel mosfet, and limits the current peak at current-limit level to prevent loads and the device from damages in overload conditions. over-temperature protection (otp) the over-temperature circuit limits the junction tempera- ture of the apw7236. when the junction temperature ex- ceeds 150 o c, a thermal sensor turns off the power mosfet, allowing the device to cool. the thermal sen- sor allows the converter to start a soft-start process and regulate the leds current 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. enable/shutdown driving en to ground places the apw7236 in shutdown mode. when in shutdown, the internal power mosfet turns off, all internal circuitry shuts down and the quies- cent supply current reduces to 1 m a maximum. this pin also could be used as a digital input allowing brightness controlled by using a pwm signal with frequency from 100hz to 100khz. the 0% duty cycle of pwm signal corre- sponds to zero leds current and 100% corresponds to full one. suggestion dimmimg duty range is from 8% to 100% at 100khz dimmimg frequency. open-led protection in driving led applications, the feedback voltage on fb pin falls down if one of the leds, in series, is failed. meanwhile, the converter unceasingly boosts the output voltage like an open-loop operation. therefore, an over- voltage protection monitoring the output voltage via ovp pin is integrated into the chip to prevent the lx and the output voltages from exceeding their maximum voltage ratings. once the voltage on the ovp pin rises above the ovp threshold, the converter stops switching and pre- vents the output voltage from rising. the converter can work again when the ovp voltage falls below the falling of ovp voltage threshold.
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 4 - s e p . , 2 0 1 2 a p w 7 2 3 6 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 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 c u r r e n t p e a k s 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 i t h l a r g e r c i n . 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 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 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 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 for high efficiencies, the inductor should have a low dc resistance to minimize conduction losses. especially at high-switching frequencies the core material has a higher impact on efficiency. when using small chip inductors, the efficiency is reduced mainly due to higher inductor core losses. this needs to be considered when select- ing the appropriate inductor. the inductor value deter- mines the inductor ripple current. the larger the inductor value, the smaller the inductor ripple current and the lower the conduction losses of the converter. conversely, larger inductor values cause a slower load transient response. a reasonable starting point for setting ripple current, d i l , is 30% to 50% of the average inductor current. the rec- ommended inductor value can be calculated 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 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 : 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 apw7236 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 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 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 esr peak r i v esr ? d h = in out ) max ( out ) max ( in v v i i esr peak esr r i v ? 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 . 4 - s e p . , 2 0 1 2 a p w 7 2 3 6 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 ( 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 . l a y o u t c o n s i d e r a t i o n s 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 h o l e s f o r g o o d 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 v o l t a g e r i p p l e . 2 . t o m i n i m i z e c o p p e r t r a c e c o n n e c t i o n s t h a t c a n i n j e c t n o i s e i n t o t h e s y s t e m , t h e i n d u c t o r s h o u l d b e p l a c e d a s c l o s e a s p o s s i b l e t o t h e l x p i n t o m i n i m i z e t h e n o i s e c o u p l i n g i n t o o t h e r c i r c u i t s . 3 . t h e f e e d b a c k n e t w o r k s h o u l d b e r o u t e d a w a y f r o m t h e i n d u c t o r . t h e f e e d b a c k p i n a n d f e e d b a c k n e t w o r k s h o u l d b e s h i e l d e d w i t h a g r o u n d p l a n e o r t r a c e t o m i n i m i z e n o i s e c o u p l i n g i n t o t h i s c i r c u i t . 4 . a s t a r g r o u n d c o n n e c t i o n o r g r o u n d p l a n e m i n i m i z e s g r o u n d s h i f t s a n d n o i s e i s r e c o m m e n d e d . 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 : 1 r v 2 . 0 i led =
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 4 - s e p . , 2 0 1 2 a p w 7 2 3 6 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 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 . 4 - s e p . , 2 0 1 2 a p w 7 2 3 6 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 s o t - 2 3 - 6 a note : dimension d and e 1 do not include mold flash , protrusions or gate burrs . mold flash , protrusion or gate burrs shall not exceed 10 mil per side . 0 . 020 0 . 008 0 . 004 0 . 024 0 . 035 0 . 039 max . 0 . 30 l 0 0 e e e 1 e 1 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 a 1 a 2 a 0 . 01 0 . 70 tsot - 23 - 6 a 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 d e e 1 b e 1 e c see view a a 2 a 1 a view a l 0 . 2 5 seating plane gauge plane
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 4 - s e p . , 2 0 1 2 a p w 7 2 3 6 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 ? 0.20 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+0.10 - 0.00 1.5 min. 0.6+0.00 - 0 .4 3.35 min 3.35 min 1.30 ? 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 ? 0.30 1.75 ? 0.10 3.5 ? 0.05 p 0 p1 p 2 d 0 d1 t a 0 b 0 k 0 tsot - 23 - 6a 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 (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 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 . 4 - s e p . , 2 0 1 2 a p w 7 2 3 6 w w w . a n p e c . c o m . t w 1 5 d e v i c e s p e r u n i t package type unit quantity tdfn2 x 2 - 8 tape & reel 3000 t sot - 23 - 6a tape & reel 3000 t a p i n g d i r e c t i o n i n f o r m a t i o n t d f n 2 x 2 - 8 user direction of feed t s o t - 2 3 - 6 a user direction of feed aaax aaax aaax aaax aaax aaax aaax
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 4 - s e p . , 2 0 1 2 a p w 7 2 3 6 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 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.
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 4 - s e p . , 2 0 1 2 a p w 7 2 3 6 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 table 2. pb - free process ? classification temperatures (tc) package thickness volume mm 3 <350 volume mm 3 350 - 2000 volume mm 3 >2000 <1.6 mm 260 c 260 c 260 c 1.6 mm ? 2.5 mm 260 c 250 c 245 c 3 2.5 mm 250 c 245 c 245 c table 1. snpb eutectic process ? classification temperatures (tc) package thickness volume mm 3 <350 volume mm 3 3 350 <2.5 mm 235 c 22 0 c 3 2.5 mm 220 c 220 c test item method description solderability jesd - 22, b102 5 sec, 245 c holt jesd - 22, a108 1000 hrs, bias @ 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 r e l i a b i l i t y t e s t p r o g r a m 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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