View APW7000QAI-TRG_7243393.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

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 . 2 - f e b . , 2 0 0 9 a p w 7 0 0 0 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 x / 1 . 5 x / 2 x c h a r g e p u m p w h i t e l e d d r i v e r f e a t u r e s 1 . 5 % led current matching high efficiency up to 90% over li-ion battery discharge output current up to 30ma per led 2.7v to 5.5v operating voltage allow to turn on or off a combination of leds 1x/1.5x/2x charge pump modes low shutdown current: 2 m a maximum low input ripple and emi internal soft-start limits inrush current short circuit current limit thermal shutdown protection output over-voltage protection 16-pin qfn package 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 the apw7000 is a high efficiency charge pump white led driver; the device drives up to four white leds with regulated constant current for uniform intensity. the sup- ply voltage ranges from 2.7v to 5.5v and it is optimized for a li-ion battery application. the apw7000 operates in 1x, 1.5x, and 2x charge pump modes and automatically switches the charge pump modes depend on the input voltage to maintain the required power for high power efficiency. the apw7000 provides up to 30ma per led, for a total of 120ma and allows several methods such as a pwm signal on the ctrl0 pin for led dimming. three control logic pins allow to disable or enable a combina- tion of leds. the supply current is only 2ma in 2x mode, and the en pin allows the device to enter shutdown mode with 2 m a quiescent current. the apw7000 switches at 1mhz frequency and only requires four 1 m f ceramic ca- pacitors and one resistor, and ensures low input current ripple and emi. the apw7000 is available in a 16-pin qfn package. cellular phone white led back light portable device pda, handheld computer dsc p i n c o n f i g u r a t i o n qfn4x4-16 (top view) 1 3 2 4 6 5 7 8 i l e d 2 i l e d 1 ctrl1 ctrl0 en i s e t ctrl2 v o u t i l e d 3 i l e d 4 c1+ c1- gnd c 2 + c2- v i n 12 10 11 9 15 16 14 13 metal gnd pad (bottom)
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 . 2 - f e b . , 2 0 0 9 a p w 7 0 0 0 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 n o t e : a n p e c l e a d - f r e e p r o d u c t s c o n t a i n m o l d i n g c o m p o u n d s / d i e a t t a c h m a t e r i a l s a n d 1 0 0 % m a t t e t i n p l a t e t e r m i n a t i o n f i n i s h ; w h i c h a r e f u l l y c o m p l i a n t w i t h r o h s . a n p e c l e a d - f r e e p r o d u c t s m e e t o r e x c e e d t h e l e a d - f r e e r e q u i r e m e n t s o f i p c / j e d e c j - s t d - 0 2 0 c f o r m s l c l a s s i f i c a t i o n a t l e a d - f r e e p e a k r e f l o w t e m p e r a t u r e . a n p e c d e f i n e s ? g r e e n ? t o m e a n l e a d - f r e e ( r o h s c o m p l i a n t ) a n d h a l o g e n f r e e ( b r o r c l d o e s n o t e x c e e d 9 0 0 p p m b y w e i g h t i n h o m o g e n e o u s m a t e r i a l a n d t o t a l o f b r a n d c l d o e s n o t e x c e e d 1 5 0 0 p p m b y w e i g h t ) . symbol parameter rating unit v out vout to gnd - 0.3 to +6 v v in vin to gnd - 0.3 to +6 v v c1+ , v c1 - , v c2+ , v c2 - c1+, c1 - , c2+, c2 - to gnd - 0.3 to +6 v v iled1 - 4 iled1 - 4 to gnd - 0.3 to +6 v v ctrl0/1/2 , v en ctrl0/1/2, en to gnd - 0.3 to +6 v v iset iset to gnd - 0.3 to 2 v t j maximum junction temperature +150 c t stg storage temperature - 65 ~ 150 c t sdr maximum lead soldering temperature , 10 seconds 260 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 , 2 ) n o t e 1 : s t r e s s e s b e y o n d t h e a b s o l u t e m a x i m u m r a t i n g m a y d a m a g e t h e d e v i c e a n d o p e r a t i n g i n t h e 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 . n o t e 2 : t h e m a x i m u m a l l o w a b l e p o w e r d i s s i p a t i o n a t a n y t a ( a m b i e n t t e m p e r a t u r e ) i s c a l c u l a t e d u s i n g : p d ( m a x ) = ( t j ? t a ) / q j a ; t j = 1 2 5 c . e x c e e d i n g t h e m a x i m u m a l l o w a b l e p o w e r d i s s i p a t i o n w i l l r e s u l t i n e x c e s s i v e d i e t e m p e r a t u r e . 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 r q ja thermal resistance - junction to ambient qfn4x4 - 16 40 c/w apw7000 handling code temperature range package code package code qa : qfn4x4-16 operating ambient temperature range i : -40 to 85 o c handling code tr : tape & reel assembly material g : halogen and lead free device assembly material apw7000 qa : apw7000 xxxxx xxxxx - date code
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 . 2 - f e b . , 2 0 0 9 a p w 7 0 0 0 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 symbol parameter rating unit v in input voltage 2.8 to 4.5 v v out output voltage 3 to 4 v i led led current 5 to 30 ma output current, v in >3.5v, v f =3.1v, 1x mode 180 output current, 3.5v3.1v, v f =3.1v, 1.5x mode 120 i out output current, 3.1v 2.8v, v f =3.1v, 2x mode 90 ma t a ambient temperature - 40 to 85 c 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 apw70 00 symbol parameter test conditions min. typ. max. unit v in input voltage 2.7 - 5.5 v v uvlo under - voltage lockout threshold v in falling 2.2 2.4 2.6 v under - voltage lockout hysteresis - 50 - mv in 1.5x/2x mode - 2 4 ma no switching in 1x mode - 0.5 1 ma i q quiescent current en=0 - 0.1 2 m a i led - err led current accuracy 5 ma 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 . 2 - f e b . , 2 0 0 9 a p w 7 0 0 0 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 20 30 40 50 60 70 80 90 100 2.5 3 3.5 4 4.5 4 leds at 20ma vf=3.1v i n p u t v o l t a g e ( v ) e f f i c i e n c y v s . i n p u t v o l t a g e efficiency (%) 20 30 40 50 60 70 80 90 100 2.5 3 3.5 4 4.5 4 leds at 15ma vf=3.1v i n p u t v o l t a g e ( v ) efficiency (%) e f f i c i e n c y v s . i n p u t v o l t a g e 20 30 40 50 60 70 80 90 100 2.5 3 3.5 4 4.5 4 leds at 15ma vf=3.3v e f f i c i e n c y v s . i n p u t v o l t a g e i n p u t v o l t a g e ( v ) efficiency (%) 20 30 40 50 60 70 80 90 100 2.5 3 3.5 4 4.5 4 leds at 20ma vf=3.3v i n p u t v o l t a g e ( v ) efficiency (%) e f f i c i e n c y v s . i n p u t v o l t a g e 100 120 140 160 180 200 220 240 260 2.5 3 3.5 4 4.5 5 4 leds at 30ma i n p u t v o l t a g e ( v ) i n p u t c u r r e n t v s . i n p u t v o l t a g e input current (ma) 60 80 100 120 140 160 180 200 2.5 3 3.5 4 4.5 5 4 leds at 20ma i n p u t c u r r e n t v s . i n p u t v o l t a g e i n p u t v o l t a g e ( v ) input current (ma)
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 . 2 - f e b . , 2 0 0 9 a p w 7 0 0 0 w w w . a n p e c . c o m . t w 5 25 26 27 28 29 30 31 32 2.5 3 3.5 4 4.5 5 5.5 4 leds at 30ma 16 17 18 19 20 21 2.5 3 3.5 4 4.5 5 5.5 4 leds at 20ma l e d c u r r e n t v s . i n p u t v o l t a g e i n p u t v o l t a g e ( v ) led current (ma) i n p u t v o l t a g e ( v ) led current (ma) l e d c u r r e n t v s . i n p u t v o l t a g e 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 . ) 800 850 900 950 1000 1050 1100 1150 1200 2.5 3 3.5 4 4.5 in 2x mode iled=20ma 0.7 0.8 0.9 1 1.1 1.2 2.5 3 3.5 4 4.5 5 5.5 high threshold low threshold i n p u t v o l t a g e ( v ) l o g i c t h r e s h o l d v o l t a g e v s . i n p u t v o l t a g e logic threshold voltage(v) s w i t c h i n g f r e q u e n c y v s . i n p u t v o l t a g e i n p u t v o l t a g e ( v ) switching frequency (khz) 500 600 700 800 900 1000 1100 1200 -40 -20 0 20 40 60 80 100 120 140 in 2x mode vin=4v 17 18 19 20 21 -40 -20 0 20 40 60 80 100 120 140 4 leds at 20ma vin=4v s w i t c h i n g f r e q u e n c y v s . t e m p e r a t u r e t e m p e r a t u r e ( c ) switching frequency (khz) t e m p e r a t u r e ( c ) led current (ma) l e d c u r r e n t v s . t e m p e r a t u r 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 . 2 - f e b . , 2 0 0 9 a p w 7 0 0 0 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 . ) 17 18 19 20 21 22 -40 -20 0 20 40 60 80 100 120 140 4 leds at 20ma vin=2.7v 17 18 19 20 21 22 -40 -20 0 20 40 60 80 100 120 140 4 leds at 20ma vin=3.3v t e m p e r a t u r e ( c ) l e d c u r r e n t v s . t e m p e r a t u r e led current (ma) l e d c u r r e n t v s . t e m p e r a t u r e t e m p e r a t u r e ( c ) led current (ma) 0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 2.25 2.5 2.75 3 2.5 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4 leds at 20ma vf=3.3v 200 250 300 350 400 -40 -20 0 20 40 60 80 100 120 140 in 1x mode vin=4v q u i e s c e n t c u r r e n t v s . t e m p e r a t u r e t e m p e r a t u r e ( c ) quiescent current (ma) i n p u t v o l t a g e ( v ) quiescent current (ma) q u i e s c e n t c u r r e n t v s . i n p u t v o l t a g e i in (100ma/div) v out (2v/div) en (5v/div) i led (10ma/div) 4 leds at 20ma vf=3.1v, vin=3.3v i in (100ma/div) v out (2v/div) en (5v/div) i led (10ma/div) 4 leds at 20ma vf=3.1v, vin=4v t i m e ( 0 . 1 m s / d i v ) s t a r t u p i n 1 x m o d e s t a r t u p i n 1 . 5 x m o d e t i m e ( 0 . 1 m s / d i v )
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 . 2 - f e b . , 2 0 0 9 a p w 7 0 0 0 w w w . a n p e c . c o m . t w 7 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 . ) v out (1v/div) ctrl0 (2v/div) i led (10ma/div) 4 leds at 20ma vf=3.1v, vin=4v f=200hz i in (100ma/div) v out (2v/div) en (5v/div) i led (10ma/div) 4 leds at 20ma vf=3.1v, vin=2.7v s t a r t u p i n 2 x m o d e t i m e ( 0 . 1 m s / d i v ) t i m e ( 2 m s / d i v ) d i m m i n g i n 1 x m o d e v out (1v/div) ctrl0 (1v/div) i led (10ma/div) 4 leds at 20ma, vf=3.1v, vin=2.7v, f=200hz v out (1v/div) ctrl0 (1v/div) i led (10ma/div) 4 leds at 20ma, vf=3.1v vin=3.3v, f=200hz t i m e ( 2 m s / d i v ) d i m m i n g i n 1 . 5 x m o d e d i m m i n g i n 2 x m o d e t i m e ( 2 m s / d i v ) v out (1v/div) v in (1v/div) i led (20ma/div) 4 leds at 20ma, vf=3.1v vin=3.2v to 3.8v v out (1v/div) v in (1v/div) i led (10ma/div) 4 leds at 20ma vf=3.1v, vin=4v led1 is open o v p e v e n w i t h l e d o p e n c i r c u i t t i m e ( 0 . 2 m s / d i v ) t i m e ( 0 . 1 m s / d i v ) l i n e t r a n s i e n t r e s p o n s e i n 1 x t o 1 . 5 x m o d 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 . 2 - f e b . , 2 0 0 9 a p w 7 0 0 0 w w w . a n p e c . c o m . t w 8 v out (1v/div) v in (1v/div) i led (20ma/div) 4 leds at 20ma, vf=3.1v vin=2.8v to 3.4v t i m e ( 0 . 1 m s / d i v ) l i n e t r a n s i e n t r e s p o n s e i n 1 . 5 x t o 2 x m o d e 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 . ) p i n d e s c r i p t i o n pin no. name function 1 en enable input pin. the en pin is an active high control. pull en pin above 1.3v to enable the device; pull en pin below 0.3v to disable the device. 2 ctrl0 led on/off control pin. allow disabling or enabling a combination of l eds. 3 ctrl1 led on/off control pin. allow disabling or enabling a combination of leds. 4 ctrl2 led on/off control pin. allow disabling or enabling a combination of leds. 5 iset led current set input. connect a resistor from iset to gnd to set the le d current. v iset is typically 1.2v. 6 vout output voltage pin. connect vout to the led anode. connect a 1 m f capacitor from vout to gnd. 7 vin supply voltage input pin. connect a 1 m f capacitor from vin to gnd. 8 c2+ bucket capacitor1 positive terminal. c onnect a 1 m f capacitor from c2+ to c2 - . 9 c2 - bucket capacitor1 negative terminal. connect a 1 m f capacitor from c2+ to c2 - . 10 c1+ bucket capacitor1 positive terminal. connect a 1 m f capacitor from c1+ to c1 - . 11 c1 - bucket capacitor1 negative terminal. connect a 1 m f capacitor from c1+ to c1 - . 12 gnd device ground pin. 13 iled4 leds cathode connection. the led current flows from vout through led into iled_ pin. the charge pump regulates the lowest v iled to 180mv. connect iled_ pin to vout if the led is not used. 14 iled3 leds cathode connection. the led current flows from vout through led into iled_ pin. the charge pump regulates the lowest v iled to 180mv. connect iled_ pin to vout if the led is not used. 15 iled2 leds cathode connection. the led curre nt flows from vout through led into iled_ pin. the charge pump regulates the lowest v iled to 180mv. connect iled_ pin to vout if the led is not used. 16 iled1 leds cathode connection. the led current flows from vout through led into iled_ pin. the charge pump regulates the lowest v iled to 180mv. connect iled_ pin to vout if the led is not used.
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 . 2 - f e b . , 2 0 0 9 a p w 7 0 0 0 w w w . a n p e c . c o m . t w 9 b l o c k d i a g r a m error amp 1x/1.5x/2x mode charge pump and gate control logic + - + - + - + - + - 1.2v controlled current mirror mode select and min iled select iset ctrl1 ctrl0 vin gnd c1+ c1- c2+ c2- vout iled1 iled2 iled3 iled4 current limit + - + - 0.1v por & soft-start 1mhz oscillator en ctrl2 led on/off control + - 0.18v + - 1.2v 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 apw7000 c i n 1 m f c 2 1 m f c2+ vin vout iset iled4 iled3 iled2 iled1 c2- c1+ c1- gnd ctrl2 ctrl1 ctrl0 en c 1 1 m f battery digital inputs r set 4 3 2 1 5 6 7 8 9 10 11 12 16 15 14 13 c out 1 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 . 2 - f e b . , 2 0 0 9 a p w 7 0 0 0 w w w . a n p e c . c o m . t w 1 0 f u n c t i o n d e s c r i p t i o n soft-start the apw7000 provides the soft-start function to limit the inrush current during startup. when the input voltage is supplied to the device and exceeds the uvlo voltage, the output capacitor is charged directly from input with a limited current source. approximate 100 m s after the out- put voltage approaches the input voltage, the device starts to provide the programmed led current and determines which of 1x, and 1.5x, or 2x mode is required. when the programmed led current can be reached with 1x mode, the soft-start is completed and the device operates in 1x mode. when the programmed led current cannot be reached, the charge pump goes into 1.5x mode. if the 1.5x mode charge pump cannot suffice for the led cur- rent need, the charge pump will switch to 2x mode. mode transition the apw7000 operates in 1x, 1.5x and 2x charge pump modes and automatically switches the charge pump modes depend on the input voltage to main tain the re- quired power for high power efficiency. if the apw7000 operates in 1x mode, the vout is pulled up to vin. when vin decreases, the viled will decease to maintain the regulated led current. until viled is below 100mv, the device will switch to 1.5x mode. in 1.5x mode, the viled is regulated to 0.18v, and the output voltage is vf+0.18v. if vin continues to decrease until viled is below 100mv again, the device will switch to 2x mode. when the vin rises and reaches by approximately vout-300mv, the apw7000 switches back to 1.5x mode. if the vin contin- ues to rise and reaches by approximately vout+300mv, the apw7000 switches back to 1x mode. the 2x charge pump is enough to suffice the white led for a li-ion battery application. the apw7000 ensures that in the 1x mode for as long as possible to increase the efficiency and extend the operating range by using the 2x mode. the transition voltages from 1x to 1.5x and 1.5x to 2x are given by: v t r a n s 1 x = v f + 0 . 1 v + ( i o u t x r o u t 1 x ) vtrans1.5x = [vf + 0.1v + (iout x rout1.5x)] / 1.5 w h e r e v f i s t h e f o r w a r d v o l t a g e o f l e d i o u t i s t h e o u t p u t c u r r e n t r o u t 1 x i s t h e o u t p u t i m p e d a n c e i n 1 x m o d e = 1 . 6 w r o u t 1 . 5 x i s t h e o u t p u t i m p e d a n c e i n 1 . 5 x m o d e = 7 w control logic pins t h e a p w 7 0 0 0 p r o v i d e s t h r e e l o g i c i n p u t p i n s t o e n a b l e o r d i s a b l e a c o m b i n a t i o n o f l e d s . t a b l e 1 s h o w s t h e t r u t h t a b l e o f t h e l o g i c p i n s . i f t h e l e d c h a n n e l s a r e n o t u s e d , c o n n e c t i n g t h e i l e d p i n s t o v o u t t o t u r n o f f t h e r e s p e c - t i v e l e d c h a n n e l s . control logic pin led status ctrl2 ctrl1 ctrl0 led4 led3 led2 led1 0 0 0 off off off on 0 0 1 off off on off 0 1 0 off on off off 0 1 1 on off off off 1 0 0 off off on on 1 0 1 off on on on 1 1 0 on on on on 1 1 1 off off off off table1. the truth table of control logic pins l e d c u r r e n t s e t t i n g connect a resistor from iset pin to gnd to set the led current. the iset voltage is typically 1.2v, and the led current is typically 400 times the current through the iset resistor. the led current is given by: led set i v 2 . 1 400 r = t h e a p w 7 0 0 0 p r o v i d e s u p t o 3 0 m a o f l e d c u r r e n t p e r l e d a n d t h e d e v i c e h a s a m a x c u r r e n t m a t c h i n g o f 5 % b e t w e e n a n y t w o l e d c u r r e n t s a n d a m a x c u r r e n t a c c u - r a c y o f 8 % . i f h i g h a c c u r a c y i s r e q u i r e d , u s i n g a 1 % p r e - c i s i o n s u r f a c e m o u n t r e s i s t o r f o r t h e n e e d . iled (ma) r set (k w ) 5 92 10 47 15 32 20 24 30 16.5 table2. r set value selection
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 . 2 - f e b . , 2 0 0 9 a p w 7 0 0 0 w w w . a n p e c . c o m . t w 1 1 f u n c t i o n d e s c r i p t i o n ( c o n t . ) 0 50 100 150 200 250 300 350 400 0 5 10 15 20 25 30 iled (ma) rset (ohm) l e d c u r r e n t s e t t i n g ( c o n t . ) f i g u r e 1 . r s e t v a l u e v s . l e d c u r r e n t shutdown/enable pull the en above 1.3v to enable the device and pull en pin below 0.3v to disable the device. in shutdown mode, all internal control circuits are turned off and the quies- cent current is below 2 m a. when the device exits shut- down mode, the output has soft-start function as the in- put voltage startup. over-voltage protection if any of leds is failed or unused led channel is not connected to the vout, the charge pump mode will go into 2x mode and the output voltage will be pumped to 2 times the input voltage. if the output voltage is over 5.5v, the over-voltage protection circuit will limit the output volt- age to approximately 5.5v.
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 . 2 - f e b . , 2 0 0 9 a p w 7 0 0 0 w w w . a n p e c . c o m . t w 1 2 a p p l i c a t i o n i n f o r m a t i o n c a p a c i t o r s e l e c t i o n f o r l o w e r i n p u t a n d o u t p u t v o l t a g e r i p p l e s , b o t h i n p u t a n d o u t p u t c a p a c i t o r s s h o u l d b e l a r g e r v a l u e s a n d l o w e r e s r c a p a c i t o r s . h o w e v e r , t h e l a r g e r o u t p u t c a p a c i t o r v a l u e s w i l l i n c r e a s e t h e s o f t - s t a r t t i m e . t h e l o w e r c h a r g e p u m p f l y i n g c a p a c i t o r s v a l u e s a n d e s r i m p r o v e t h e e f f i c i e n c y , b u t l o w e r c a p a c i t o r v a l u e s m a y l i m i t t h e l e d ? s c u r r e n t s a t l o w i n p u t v o l t a g e . i t i s r e c o m m e n d e d t h a t t h e l o w e s r a n d l o w v a r i a t i o n o v e r t e m p e r a t u r e , s u c h a s t h e c e r a m i c c a p a c i t o r s w i t h x 7 r o r x 5 r a n d t h e v a l u e i s 1 m f f o r t h e i n p u t c a p a c i t o r , o u t p u t c a p a c i t o r , a n d t h e c h a r g e p u m p f l y i n g c a p a c i t o r s . b r i g h t n e s s c o n t r o l 1. pwm dimming using ctrl0, ctrl1, ctrl2 the first method for dimming the leds is to apply a pwm signal into the ctrl0, ctrl1, and ctrl2 pins. figure2 shows the application circuit. the average led current is proportional to the pwm signal duty cycle. note that the frequency of pwm signal will affect the minimum dim- ming duty. figure3 shows the led current vs. dimming frequency and dimming duty, the recommend dimming frequency is below 10khz. the average led current is calculated by the following equation: where: i led(max) is programmed led current by iset pin toff is the off time of the pwm signal ton is the on time of the pwm signal ctrl2 ctrl1 ctrl0 en vin 4 3 2 1 apw7000 off on pwm figure 2. pwm dimming application circuit 0 2 4 6 8 10 12 14 16 18 20 0 10 20 30 40 50 60 70 80 90 100 dimming duty (%) led current (ma) f=40khz f=100hz led=20ma vin=2.7v, 2x mode f=50khz f=10khz figure 3. pwm dimming frequency vs. led current 2. analog dimming with analog voltage the second method for dimming the leds is to apply a voltage through a resistor into the iset pin. the variation of led current is proportional to the variation of the ana- log voltage. if the resistor values are chosen correctly, the analog control voltage varies the output current from 0ma to full led current. figure 4 shows the application circuit. see the table2 and choose the required maximum led current and the corresponsive r set value, using the be- low equation to calculate the values of r1 and r2, note that the v adj will need to be greater than 1.2v. w h e r e : v i s e t = 1 . 2 v v a d j = t h e a n a l o g v o l t a g e f o r d i m m i n g t h e l e d s r s e t = t h e e q u i v a l e n t r s e t r e s i s t a n c e ( s e e t a b l e 2 ) . iset r1 5 apw7000 v adj r2 figure 4. analog voltage dimming application circuit toff ton i toff i (max) led ) avg ( led + = set adj iset adj adj r v 2 r ) v v ( 1 r v + - =
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 . 2 - f e b . , 2 0 0 9 a p w 7 0 0 0 w w w . a n p e c . c o m . t w 1 3 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 . ) b r i g h t n e s s c o n t r o l ( c o n t . ) 3. digital dimming with external nmos transistors the third method for dimming the leds is to change the equivalent resistance for r set with the external nmos transistors. the equivalent resistance is the parallel combinations of the r1, r2, r3, and r4. r4 is always connected and selected for the minimum led current. figure 5 shows the application circuit. iset 5 apw7000 r1 r2 r4 r3 figure 5. digital dimming application circuit 4. pwm dimming with en pin another method for dimming the leds is to apply a pwm signal into the en pin. the average led current is pro- portional to the pwm signal duty cycle. note that the fre- quency of pwm signal will affect the minimum dimming duty. the recommend dimming frequency is between 100hz and 1khz. the average led current is calculated by the following equation: where: i led(max) is programmed led current by iset pin toff is the off time of the pwm signal ton is the on time of the pwm signal layout consideration the apw7000 is a high frequency charge pump for white led driver and requires some care when laying out the printed circuit board. the metal gnd pad of the bottom of the package must be soldered to the pcb and connected to the gnd plane on the backside through several ther- mal vias. place the cin, cout, c1, and c2 as close to ic as possible for reducing the switching noise. toff ton i ton i (max) led ) avg ( 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 . 2 - f e b . , 2 0 0 9 a p w 7 0 0 0 w w w . a n p e c . c o m . t w 1 4 p a c k a g e i n f o r m a t i o n qfn4x4-16 pin 1 d e a b a1 a3 d2 pin 1 corner e 2 k l e s y m b o l min. max. 1.00 0.00 0.25 0.35 2.10 2.50 0.05 2.10 a a1 b d d2 e e2 e l millimeters a3 0.20 ref qfn4x4-16 0.30 0.50 2.50 0.008 ref min. max. inches 0.039 0.000 0.010 0.014 0.083 0.098 0.083 0.012 0.020 0.80 0.098 0.031 0.002 0.65 bsc 0.026 bsc 3.90 4.10 0.154 0.161 3.90 4.10 0.154 0.161 0.20 0.008 k
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 . 2 - f e b . , 2 0 0 9 a p w 7 0 0 0 w w w . a n p e c . c o m . t w 1 5 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 qfn4x4 - 16 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 4.30 ? 0.20 4.30 ? 0.20 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 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 package type unit quantity qfn4x4 - 16 tape & reel 3000 d e v i c e s p e r u n i t
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 2 - f e b . , 2 0 0 9 a p w 7 0 0 0 w w w . a n p e c . c o m . t w 1 6 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 qfn4x4-16 c l a s s i f i c a t i o n p r o f i l e user direction of feed
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 . 2 - f e b . , 2 0 0 9 a p w 7 0 0 0 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 esd mil - std - 883 - 3015.7 vhbm ? 2kv, vmm ? 200v latch - u p 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 . 2 - f e b . , 2 0 0 9 a p w 7 0 0 0 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

▲Up To Search▲

Price & Availability of APW7000QAI-TRG

	To Download APW7000QAI-TRG Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .