View PAM8615RHR_7180411.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

key features applications n n general description t h e pa m8 6 15 i s a v a il a bl e in a t s s o p - 24 package. n 32w/ch into 8ohm btl load from 24v supply (thermal limited) 16w ch into 4ohm se load from 24v supply thermal limited operates from 8v to 30v supports multiple output configurations 2-ch single-ended (half bridge)(16wx2) 1 ch bridge tied load full bridge 32wx1 high efficiency above 90 64 setp dc volume control from 40db to 36db singel ended analog inputs thermal and short circuit protection flexible frequency adjustable by external component clock output for synchronization with multiple class d devices no pop noise for start up and shut d own sequences space saving surface mount 24 pin tssop package pb-free package televisions home sound systems n n n n n n n n n n n n n n / ( ) : - - - ( - ) ( ) , % . - - - - - - - - - - the pam8615 is a 16w 32w per channel efficient class d audio power amplifier for driving stereo speakers in a single ended configuration or mono bridge tied speaker the pam8615 can drive single ended speakers as low as 4 due to the low power dissipation and high efficiency the device can be used without any external heat sink when playing music stereo speaker volume is controlled with a dc voltage applied to the volume control terminal offering a range of gain from 40 db to 36 db / ( ) , - - - . - . . - . 1 www.poweranalog.com 02/2012 rev1.1 typical application , power analog microelectronics inc pam8615 16w/32w stereo class-d audio power amplifier single-ended configuration p a m 8 6 1 5 o u t _ a 1 p v c c _ a 2 s h d n 3 m u t e 4 i n _ a 5 d g n d 6 i n _ b 7 v c m 8 d c v 9 m s _ s v 1 0 p v c c _ b 1 1 o u t _ b 1 2 o u t _ b 1 3 p g n d _ b 1 4 b s t _ b 1 5 v c l a m p 1 6 s y n c 1 7 a g n d 1 8 r o s c 1 9 a v d d 2 0 a v c c 2 1 b s t _ a 2 2 p g n d _ a 2 3 o u t _ a 2 4 1 u f 1 u f 0 . 2 2 u f 0 . 2 2 u f 2 2 u h 1 2 1 0 0 0 u f 4 7 0 u f 1 u f 1 0 0 k s h d n o n v c c m u t e o n r i r i i n a i n b 1 0 u f 0 . 1 u f v o l u m e 2 4 7 0 u f v c c 2 2 2 u h 1 2 1 0 0 0 u f 1 0 u f 0 . 1 u f 0 . 6 8 u f 0 . 6 8 u f v c c 1 u f 1 u f 0 . 1 u f 1 0 u f
block diagram 2 , power analog microelectronics inc www.poweranalog.com pam8615 16w/32w stereo class-d audio power amplifier 02/2012 rev1.1 btl configuration otp on/off depop sc detect ms_sv 5v ldo avdd avcc osc/ramp protection logic agnd dgnd rosc sync + _ driver driver pvcc_a out_a pgnd_a pvcc_b out_b pgnd_b bst_a bst_b vcm in_b dcv vclamp modulation logic modulation logic + _ 2-order error amp 2-order error amp + - + - gain adj in_a gain adj vcm gain control vcm shdn mute vlcamp vlcamp f b f b p a m 8 6 1 5 o u t _ a 1 p v c c _ a 2 s h d n 3 m u t e 4 i n _ a 5 d g n d 6 i n _ b 7 v c m 8 d c v 9 m s _ s v 1 0 p v c c _ b 1 1 o u t _ b 1 2 o u t _ b 1 3 p g n d _ b 1 4 b s t _ b 1 5 v c l a m p 1 6 s y n c 1 7 a g n d 1 8 r o s c 1 9 a v d d 2 0 a v c c 2 1 b s t _ a 2 2 p g n d _ a 2 3 o u t _ a 2 4 1 u f 1 u f 0 . 2 2 u f 0 . 2 2 u f 4 7 0 u f 1 u f 1 0 0 k o n s h d n v c c m u t e o n r i 1 r i 2 i n - i n + 1 0 u f 0 . 1 u f v o l u m e 4 7 0 u f v c c 1 0 u f 0 . 1 u f 1 0 0 0 p f 1 0 0 0 p f v c c 1 u f 1 u f 0 . 1 u f 1 0 u f
pin descriptions 3 , power analog microelectronics inc www.poweranalog.com pam8615 16w/32w stereo class-d audio power amplifier p i n n a m e i / o / p d e s c r i p t i o n 1 . 2 4 o u t _ a o h - b r i d g e a o u t p u t 2 p v c c _ a p p o w e r s u p p l y f o r h - b r i d g e a , n o t c o n n e c t e d t o p v c c _ b o r a v c c 3 s h d n i s h u t d o w n s i g n a l f o r i c ( l o w = s h u t d o w n , h i g h = o p e r a t i o n a l ) . t t l l o g i c l e v e l s w i t h c o m p l i a n c e t o a v c c 4 m u t e i a l o g i c h i g h o n t h i s p i n d i s a b l e s t h e o u t p u t s . a l o w o n t h i s p i n e n a b l e s t h e o u t p u t s . t t l l o g i c l e v e l s w i t h c o m p l i a n c e t o a v c c 5 i n _ a i a u d i o i n p u t f o r c h a n n e l a 6 d g n d p d i g i t a l g n d 7 i n _ b i a u d i o i n p u t f o r c h a n n e l b 8 v c m o r e f e r e n c e f o r a n a l o g c e l l s 9 d c v i d c v o l t a g e s e t t i n g t h e g a i n o f t h e a m p l i f i e r 1 0 m s _ s v i m a s t e r / s l a v e s e l e c t f o r d e t e r m i n i n g d i r e c t i o n o f s y n c t e r m i n a l . h i g h = m a s t e r m o d e , s y n c t e r m i n a l i s a n o u t p u t ; l o w = s l a v e m o d e , s y n c t e r m i n a l a c c e p t s a c l o c k i n p u t . 1 1 p v c c _ b p p o w e r s u p p l y f o r h - b r i d g e b , n o t c o n n e c t e d t o p v c c _ a o r a v c c 1 2 . 1 3 o u t _ b o h - b r i d g e b o u t p u t 1 4 p g n d _ b p p o w e r g r o u n d f o r h - b r i d g e b 1 5 b s t _ b i / o b o o t s t r a p i / o f o r h - b r i d g e b h i g h - s i d e f e t 1 6 v c l m a p p i n t e r n a l l y g e n e r a t e d v o l t a g e s u p p l y f o r b o o t s t r a p . n o t t o b e u s e d a s a s u p p l y o r c o n n e c t e d t o a n y c o m p o n e n t o t h e r t h a n t h e d e c o u p l i n g c a p a c i t o r . 1 7 s y n c i / o c l o c k i n p u t / o u t p u t f o r s y n c h r o n i z i n g m u l t i p l e c l a s s - d d e v i c e s . d i r e c t i o n d e t e r m i n e d b y m s _ s v t e r m i n a l . 1 8 a g n d p a n a l o g g n d 1 9 r o s c i / o c u r r e n t s e t t i n g r e s i s t o r f o r r a m p g e n e r a t o r 2 0 a v d d p a n a l o g 5 v r e g u l a t e d o u t p u t 2 1 a v c c p h i g h - v o l t a g e a n a l o g p o w e r s u p p l y 2 2 b s t _ a i / o b o o t s t r a p i / o f o r h - b r i d g e a h i g h - s i d e f e t 2 3 p g n d _ a p p o w e r g r o u n d f o r h - b r i d g e a 02/2012 rev1.1 pin configuration & marking information tssop24 x: internal code y: year ww: week ll: internal code out_a pvcc_a shdn mute in_a in_b vcm dcv ms_sv pvcc_b out_b out_b pgnd_b bst_b vclamp sync agnd avdd avcc bst_a pgnd_a out_a 17 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 18 19 20 21 22 23 24 dgnd rosc
4 absolute maximum ratings these are stress ratings only and functional operation is not implied exposure to absolute maximum ratings for prolonged time periods may affect device reliability all voltages are with respect to ground . . . , power analog microelectronics inc www.poweranalog.com supply voltage avcc, pvcc................-0.3 to 30v storage temperature.....................-65c to 150 soldering temperature....................... logic input voltage: shdn, mute........................-0.3v to avcc+0.3v dcv, ms_sv, sync...............................0 to 5.5v analog input voltage: in-a,in-b..............................................0 to 5.5v c 300c,5sec recommended operating conditions pam8615 16w/32w stereo class-d audio power amplifier thermal information p a r a m e t e r s y m b o l p a c k a g e m a x i m u m u n i t t h e r m a l r e s i s t a n c e ( j u n c t i o n t o a m b i e n t ) j a t s s o p - 2 4 3 0 c / w supply voltage (vcc)...........................10v to 26v dcv volume control pin .........................0v to 5v fosc oscillator frequency (rosc=100k )............ .................................................. 250 to 350khz temperature ....-40c to 85c c c junction temperature rang......... .....-40c to 160c ambient temperature range...............-40c to 85c ta-operating free-air ambient operating temperature.........-20 to 85 02/2012 rev1.1
5 electrical characteristic vcc=24v, gain = 20db, r =4 t =25c unless otherwise noted. l a , , power analog microelectronics inc www.poweranalog.com pam8615 16w/32w stereo class-d audio power amplifier t e s t c o n d i t i o n s m i n t y p m a x u n i t s | v o s | c l a s s - d o u t p u t o f f s e t v o l t a g e ( m e a s u r e d d i f f e r e n t l y ) v i = 0 v , a v = 3 6 d b 1 0 6 5 m v i c c q u i e s c e n t s u p p l y c u r r e n t s h d n = 2 v , m u t e = 0 v , i n p u t a c _ g n d , n o l o a d 2 5 4 0 m a i c c ( m u t e ) q u i e s c e n t s u p p l y c u r r e n t i n m u t e m o d e m u t e = 2 v , n o l o a d 2 5 4 0 m a i c c ( s d ) q u i e s c e n t s u p p l y c u r r e n t i n s h u t d o w n m o d e s h d n = 0 . 5 v , n o l o a d 5 2 0 u a f o s c o s c i l l a t o r f r e q u e n c y r o s c = 1 0 0 k o h m 3 2 3 k h z r d s ( o n ) d r a i n - s o u r c e o n - s t a t e r e s i s t a n c e v c c = 2 4 v , i o = 1 a , t a = 2 7 o c 2 2 0 m p s r r p o w e r s u p p l y r e j e c t i o n r a t i o v c c = 2 3 . 5 v t o 2 4 . 5 v - 6 0 d b v c c = 2 4 v , r l = 4 o h m , f = 1 k h z 1 4 v c c = 2 4 v , r l = 8 o h m , f = 1 k h z 8 . 2 v c c = 2 4 v , r l = 4 o h m , f = 1 k h z 1 7 . 3 v c c = 2 4 v , r l = 8 o h m , f = 1 k h z 9 . 8 v c c = 2 4 v , r l = 8 o h m , f = 1 k h z 2 7 v c c = 1 2 v , r l = 8 o h m , f = 1 k h z 7 v c c = 2 4 v , r l = 8 o h m , f = 1 k h z 3 5 v c c = 1 2 v , r l = 8 o h m , f = 1 k h z 9 r l = 4 o h m , f = 1 k h z , p o = 1 0 w 0 . 2 5 % r l = 8 o h m , f = 1 k h z , p o = 5 w 0 . 1 5 % v n o u t p u t i n t e g r a t e d n o i s e f l o o r 2 0 h z t o 2 2 k h z , a - w e i g h t e d f i l t e r , g a i n = 2 0 d b - 6 7 d b v c s c r o s s t a l k p o = 1 w , f = 1 k h z , g a i n = 2 0 d b - 6 0 d b s n r s i g n a l - t o - n o i s e r a t i o m a x o u t p u t a t t h d + n < 1 % , f = 1 k h z , g a i n = 2 0 d b 8 6 d b t h e r m a l t r i p p o i n t 1 6 0 o c t h e r m a l h y s t e r s i s 4 0 o c p a r a m e t e r p o ( s e ) o u t p u t p o w e r a t 1 % t h d + n p o ( b t l ) o u t p u t p o w e r a t 1 % t h d + n o u t p u t p o w e r a t 1 0 % t h d + n w o u t p u t p o w e r a t 1 0 % t h d + n t h d + n t o t a l h a r m o n i c d i s t o r t i o n + n o i s e w 02/2012 rev1.1
6 , power analog microelectronics inc www.poweranalog.com pam8615 16w/32w stereo class-d audio power amplifier s t e p t o t a l _ g a i n s t e p t o t a l _ g a i n ( v ) ( d b ) ( v ) ( d b ) 1 0 . 1 0 - 6 0 3 3 2 . 3 4 1 7 . 4 2 0 . 1 7 - 4 0 3 4 2 . 4 1 1 8 3 0 . 2 4 - 3 0 3 5 2 . 4 8 1 8 . 6 4 0 . 3 1 - 2 0 3 6 2 . 5 5 1 9 . 2 5 0 . 3 8 - 1 0 3 7 2 . 6 2 1 9 . 8 6 0 . 4 5 - 5 3 8 2 . 6 9 2 0 . 4 7 0 . 5 2 - 2 . 5 3 9 2 . 7 6 2 1 8 0 . 5 9 0 4 0 2 . 8 3 2 1 . 6 9 0 . 6 6 2 4 1 2 . 9 2 2 . 2 1 0 0 . 7 3 3 4 2 2 . 9 7 2 2 . 8 1 1 0 . 8 4 4 3 3 . 0 4 2 3 . 4 1 2 0 . 8 7 4 . 8 4 4 3 . 1 1 2 4 1 3 0 . 9 4 5 . 4 4 5 3 . 1 8 2 4 . 6 1 4 1 . 0 1 6 4 6 3 . 2 5 2 5 . 2 1 5 1 . 0 8 6 . 6 4 7 3 . 3 2 2 5 . 8 1 6 1 . 1 5 7 . 2 4 8 3 . 3 9 2 6 . 4 1 7 1 . 2 2 7 . 8 4 9 3 . 4 6 2 7 1 8 1 . 2 9 8 . 4 5 0 3 . 5 3 2 7 . 6 1 9 1 . 3 6 9 5 1 3 . 6 2 8 . 2 2 0 1 . 4 3 9 . 6 5 2 3 . 6 7 2 8 . 8 2 1 1 . 5 1 0 . 2 5 3 3 . 7 4 2 9 . 4 2 2 1 . 5 7 1 0 . 8 5 4 3 . 8 1 3 0 2 3 1 . 6 4 1 1 . 4 5 5 3 . 8 8 3 0 . 6 2 4 1 . 7 1 1 2 5 6 3 . 9 5 3 1 . 2 2 5 1 . 7 8 1 2 . 6 5 7 4 . 0 2 3 1 . 8 2 6 1 . 8 5 1 3 . 2 5 8 4 . 0 9 3 2 . 4 2 7 1 . 9 2 1 3 . 8 5 9 4 . 1 6 3 3 2 8 1 . 9 9 1 4 . 4 6 0 4 . 2 3 3 3 . 6 2 9 2 . 0 6 1 5 6 1 4 . 3 3 4 . 2 3 0 2 . 1 3 1 5 . 6 6 2 4 . 3 7 3 4 . 8 3 1 2 . 2 1 6 . 2 6 3 4 . 4 4 3 5 . 4 3 2 2 . 2 7 1 6 . 8 6 4 4 . 5 1 3 6 v o l t a g e o f t h e v o l u m e v o l t a g e o f t h e v o l u m e dc volume control 02/2012 rev1.1
+ 0 + 2 4 + 2 + 4 + 6 + 8 + 1 0 + 1 2 + 1 4 + 1 6 + 1 8 + 2 0 + 2 2 d b g a 2 0 2 0 k 5 0 1 0 0 2 0 0 5 0 0 1 k 2 k 5 k 1 0 k h z 0 . 1 2 0 0 . 2 0 . 5 1 2 5 1 0 % 1 m 2 0 2 m 5 m 1 0 m 2 0 m 5 0 m 1 0 0 m 2 0 0 m 5 0 0 m 1 2 5 1 0 w typical performance characteristics v =24v,r =8 ,t =25 c dd l a (unless otherwise noted). 7 , power analog microelectronics inc www.poweranalog.com 1. thd power ? s (load=8 ingle-ended ) 3. frequency response ? single-ended 5. psrr ? single-ended 6. thd power ? single-ended 4. cross talk ? single-ended pam8615 16w/32w stereo class-d audio power amplifier 0 . 0 1 3 0 0 . 0 2 0 . 0 5 0 . 1 0 . 2 0 . 5 1 2 5 1 0 2 0 % 1 0 2 0 k 2 0 5 0 1 0 0 2 0 0 5 0 0 1 k 2 k 5 k 1 0 k h z - 1 0 0 - 3 0 - 9 5 - 9 0 - 8 5 - 8 0 - 7 5 - 7 0 - 6 5 - 6 0 - 5 5 - 5 0 - 4 5 - 4 0 - 3 5 d b 2 0 2 0 k 5 0 1 0 0 2 0 0 5 0 0 1 k 2 k 5 k 1 0 k h z t t t t t t t t t t t t t t t - 1 0 0 - 2 0 - 9 5 - 9 0 - 8 5 - 8 0 - 7 5 - 7 0 - 6 5 - 6 0 - 5 5 - 5 0 - 4 5 - 4 0 - 3 5 - 3 0 - 2 5 d b 2 0 2 0 k 5 0 1 0 0 2 0 0 5 0 0 1 k 2 k 5 k 1 0 k h z t t t t t t t t t t t t t t 02/2012 rev1.1 g =20db v gain=20db v =24v vpp=200mv dd po=1w cout=1000uf 2. thd power ? single-ended(load=4 ) 0 . 0 8 2 0 0 . 2 0 . 5 1 2 5 1 0 % 1 m 2 0 2 m 5 m 1 0 m 2 0 m 5 0 m 1 0 0 m 2 0 0 m 5 0 0 m 1 2 5 1 0 w v =12v dd v =18v dd v =24v dd v =12v dd v =18v dd v =24v dd
+ 20 + 40 + 22 + 24 + 26 + 28 + 30 + 32 + 34 + 36 + 38 d b r a 20 20 k 50 100 200 500 1 k 2 k 5 k 10 k hz 0 . 1 20 0 . 2 0 . 5 1 2 5 10 % 10 m 40 20 m 50 m 100 m 200 m 500 m 1 2 5 10 20 w typical performance characteristics v =24v,r =8 ,t =25 c dd l a (unless otherwise noted). 8 , power analog microelectronics inc www.poweranalog.com 7. thd power ? btl 9. thd frequency? btl 10. psrr? btl 8. frequency response? btl pam8615 16w/32w stereo class-d audio power amplifier 0 . 0 1 3 0 0 . 0 2 0 . 0 5 0 . 1 0 . 2 0 . 5 1 2 5 1 0 2 0 % 1 0 2 0 k 2 0 5 0 1 0 0 2 0 0 5 0 0 1 k 2 k 5 k 1 0 k h z - 1 0 0 - 2 0 - 9 5 - 9 0 - 8 5 - 8 0 - 7 5 - 7 0 - 6 5 - 6 0 - 5 5 - 5 0 - 4 5 - 4 0 - 3 5 - 3 0 - 2 5 d b 2 0 2 0 k 5 0 1 0 0 2 0 0 5 0 0 1 k 2 k 5 k 1 0 k h z t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t 02/2012 rev1.1 g =20db v v =12v dd v =18v dd v =24v dd cin=1uf v =24v vpp=200mv dd v =15v dd
9 , power analog microelectronics inc www.poweranalog.com application information power and heat dissipation choose speakers that are able to stand large output power from the pam8615. otherwise, speaker may suffer damage. heat dissipation is very important when the device works in full power operation. two factors affect the heat dissipation, the efficiency of the device that determines the dissipation power, and the thermal resistance of the package that determines the heat dissipation capability. generally, class-d amplifiers are high efficiency and need no heat sink. for high power ones that has high dissipation power, the heat sink may also not necessary if the pcb is carefully designed to achieve good heat dissipation by the pcb itself. dual-side pcb to achieve good heat dissipation, the pcb's copper plate should be thicker than 35um and the copper plate on both sides of the pcb should be utilized for heat sink. the thermal pad on the bottom of the device should be soldered to the plate of the pcb, and via holes, usually 9 to 16, should be drilled in the pcb area under the device and deposit ed copper on the vias should be thick enough so that the heat can be dissipated to the other side of the plate. there should be no insulation mask on the other side of the copper plate. it is better to drill more vias on the pcb around the device if possible. a dc volume control section is integrated in pa m8 61 5, c on tro ll i ng v ia dcv and dg nd terminals. the voltage on dcv pin, determines internal amplifier gain as listed in page6. if a resistor divider is used to fix gain of the amplifier, the dcv t erminal can be directly connected to the resistor divider connected across avdd and dgnd. for fixed gain, the resistor divider values are calculated to center the voltage given in page6. the mute pin is an input for controlling the output state of the pam8615. a logic high on this pin disables the outputs and low enables the outputs. this pin may be used as a quick disable or enable of the outputs without a volume fade. volume control mute operation notes 1. the ap aux-0025 low pass filter is necessary for class-d amplifier measurement with ap analyzer . 2. two 22h inductors are used in series with load resistor to emulate the small speaker for effic iency measurement. test setup for performance testing ap system one generator pam8615 demo board +out input load ap low pass filter aux - 0025 ap system two analyzer gnd - out vdd power supply pam8615 16w/32w stereo class-d audio power amplifier 02/2012 rev1.1
10 , power analog microelectronics inc www.poweranalog.com shutdown operation internal bias generator capacitor selection power supply decoupling, cs selection of rosc bst_a and bst_b capacitors vclamp capacitors internal regulated 5-v supply (avdd) the pam8615 employs a shutdown operation mode to reduce supply current to the absolute minimum level during periods of non-use to save power. the sd input terminal should be pull high during normal operation when the amplifier is in use. pulling sd low causes the outputs to mute and the amplifier to enter a low-current state. sd should never be left unconnected to prevent the amplifier from unpredictable operation. for the best power-off pop performance, the amplifier should be set in shutdown mo de prior to removing the power supply voltage. the internal bias generator (vcm) provides the internal bias for the preamplifier stage. the exter nal input capa citor s and this inter nal reference allow the inputs to be biased within the o p t i m a l c o m m o n - m o d e r a n g e o f th e i n p u t preamplifiers. the selection of the capacitor value on the vcm terminal is critical for achieving the best device performance. during startup or recovery from shutdown state, the vcm capacitor determines the rate at which the am plifier starts up. the startup time is not critical for the best de-pop performance since any heard pop sound is the result of the class-d output switching-on other than that of the startup time. however, at least a 0.47f capacitor is recommended for the vcm capacitor. another function of the vcm capacitor is to bypass high frequency noise on the internal bias generator. the pam8615 is a high-performance cmos audio amplifier that requires adequate power supply decoupling to ensure the output tota l harmonic distortion (thd) as low as possible. power supply decoupling also prevents oscillations caused by long lead between the amplifier and the speaker. the optimum decoupling is achieved by using two capacitors of different types that target different types of noise on the power supply leads. for higher frequency transients, spikes, or digital hash on the line, a good low equivalent-series- resistance (esr) ceramic capacitor, typically 0.1f, is recommended, placing as close as possible to t he device's pvcc lead. to filter l o we r - f r e qu e n c y no i s e s , a l ar ge a l um i n u m electrolytic capacitor of 470f or greater is recommended, placing near the audio power amplifier. the 10f capacitor also serves as a local storage capacitor for supplying current during large signal transients on the amplifier outputs. the switching frequency is determined by the values of components connected to rosc (pin 19) and calculated with the following equation: the recommended values is 323 khz. the half h-bridge o utput stages use nmos transistors only. they therefore require bootstrap capacitors for the high side of each output to turn on correctly. an at least 220nf ceramic capacitor, rated for at least 25v, must be connected from each output to its corresponding bootstrap input. specifically, one 220nf capacitor mus t be connected from out_a to bst_a, and another 220nf capacitor from out_b to bst_b. it is recommended to replace 220nf for lower than 100hz applications. to ensure that the maximum gate-to-so urce voltage for the nmos output transistors not exceeded, two internal regulators are used to clamp the gate voltage. a 1f capacitors must be connected from vclamp to ground and must be rated for at least 25v. the voltages at the vclamp terminals vary with vcc and may not be used to power any other circuitry. the avdd terminal is the output of an internally- generated 5v supply, used for the oscillator, preamplifier, and volume control circuitry. it requires a 0.1f to 1f capacitor, placed very close to the pin to ground to keep the regulator stable. the regulator may not be used to power any external circuitry. rosc=100k for a switching frequency of use 1 f bst capacitor to pam8615 16w/32w stereo class-d audio power amplifier 02/2012 rev1.1 p f r f o s c o s c 2 1 6 8 . 0 ? =
11 , power analog microelectronics inc www.poweranalog.com using low-esr capacitors short-circuit protection thermal protection master-slave and sync operation l o w - e s r c a p a c i t o r s a r e r e c o m m e n d e d throughout this application section. a real (with respect to ideal) capacitor can be modeled simply as a resistor in series with an ideal capacitor. the voltage drop across this resistor minimizes the beneficial effects of the capacitor in the circuit. the lower the equivalent value of this resistance the more the real capacitor behaves as an ideal capacitor. the pam8615 has short circuit protection circuitry on the outputs to prevent damage to the device when o utput-to-output shorts (btl mode), output- to-gnd shorts, or output-to-vcc shorts occur. once a short-circuit is detected on the outputs, the output drive is immediately disabled. this is a latched fault and must be reset by cycling the voltage on the sd pin to a logic low and back to the logic high state for normal operation. this will clear the short-circuit flag and allow for normal operation if the short was removed. if the short was not removed, the protection circuitry will again activate. t hermal protection on the pam8615 prevents damage to the device when the internal die temperature exceeds 160c. there is a 15 degree tolerance on this trip point from device to device. once the die temperature exceeds the set thermal point, the device enters into the shutdown state and the outputs are disabled. this is not a latched fault. the thermal fault is cleared once the temperature of the die is reduced by 40c. the device begins normal operation at this point without external system int ervention. the ms/sl and sync terminals can be used to synchronize the frequency of the class-d output switching. when the ms/sl is high or left floating due to the internal pull up resistor, the switching frequency is determined by the rosc. the sync becomes an output whose source/sink current is about 0.5ma, and the frequency of this output is also determined by the rosc. and this output can be connected to another pam8615 who is configured in the slave mode. the output switching is synchronize d to avoid any beat frequencies that occur in the audio band when two class-d amplifiers in the same system are switching at the slight different frequencies. when the ms/sl is low, the switching frequency is determined by the incoming square wave on the sync input. the snyc becomes an input in this mode and accept a square wave from another pam8615 configured in the master mode or from an external gpio. (key: ms/sl=?h?, master mode, ms/sl=?l?, slave mode) pam8615 16w/32w stereo class-d audio power amplifier 02/2012 rev1.1 out_l l 1 1 2 cb1 c1 0 out_r l 2 1 2 cb2 c2 0 ms/sl sync rosc inl inr pam8615 (master) "h"=master l 3 1 2 out+ c3 0 out- l 4 1 2 c4 0 in- in+ pam8615 (slave) sync ms/sl rosc gnd=slave rosc rosc 0
ordering information 12 packagetype tssop: r pam8615 x x x shipping , power analog microelectronics inc p a r t n u m b e r p a c k a g e t y p e s t a n d a r d p a c k a g e p a m 8 6 1 5 r h r t s s o p - 2 4 3 , 0 0 0 u n i t s / t a p e & r e e l www.poweranalog.com number of pins: 24: h pam8615 16w/32w stereo class-d audio power amplifier 02/2012 rev1.1
outline dimension 13 tssop-24 , power analog microelectronics inc www.poweranalog.com pam8615 16w/32w stereo class-d audio power amplifier 02/2012 rev1.1

▲Up To Search▲

Price & Availability of PAM8615RHR

	To Download PAM8615RHR Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .