SA7347 hangzhou?microelectronics?co.,ltd ?rev:1.1???????2007.07.27 http:?www.silan.com.cn??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?1?of?9 4-ch?audio?power?amplifier(8w?x4) description SA7347? is? a? four? channel? audio? amplifier? including ? two? non inverted? amplifiers? and? two? inverted? amplifiers, ? so? it? can? be conveniently?applied?in?bridge-tied?load?(btl)?mode. built-in? protection? circuit? based on? multiple? temperature measurements? inside? SA7347? makes? it? possible? for? all? supply voltages?and?load?conditions?to?export?maximum?power. features *??soft?clip *??standby?and?mute?mode *??no?on/off?switching?plops *??high?supply?voltage?ripple?rejection *??thermally?protected *??outputs?short?circuit?protected?to?ground,?supply?and?across the?load applications *?television,?pc?speakers?and?mini?stereo?system,?etc hsip-15 ordering?information device package SA7347 hsip-15 block?diagram + + + - + - + +
SA7347 hangzhou?microelectronics?co.,ltd ?rev:1.1???????2007.07.27 http:?www.silan.com.cn??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?2?of?9 absolute?maximum?rating (t amb =25 c) characteristics symbol condition rating unit supply?voltage v cc ? operating -0.3?~?+22 v input?voltage v in -0.3?~?v cc ?+?0.3 v repetitive?peak?output?current i orm 4 a storage?temperature?range t stg ? non-operating -55?~?+150 c ambient?temperature?range t amb -40?~?+85 c total?power?dissipation p tot 69 w supply?voltage?to?guarantee?short-circuit?protection v cc(sc) 17 v thermal?resistance?from?junction?to?ambient r th(j-a) in?free?air 40 c/w thermal?resistance?from?junction?to?case r th(j-c) all?channels?driven 1.3 c/w electrical?characteristics ?(unless?otherwise?stated,?v cc =15v,?r l(se) =4
,?r l(btl) =8
,?f=1khz,?v stby= v cc ,?t amb =25 c) characteristics symbol test?condition min. typ. max. unit quiescent?supply?current icq r l = -- 100 145 ma standby?supply?current istby -- -- 1 ma dc?output?voltage v o -- 6.9 -- v differential?output?voltage?offset v ? out btl(*) -- -- 170 mv play v cc /2+3 -- v cc mute 4.5 --? v cc /2+2 select?voltage?on?pin?stby vstby standby 0 -- 0.8 v select?current?on?pin?stby ibias? v cc /2+2 SA7347 hangzhou?microelectronics?co.,ltd ?rev:1.1???????2007.07.27 http:?www.silan.com.cn??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?3?of?9 (continued) characteristics symbol test?condition min. typ. max. unit se -- 60 -- frip=1khz(**) btl -- 65 -- db se -- 60 -- supply?voltage?ripple?rejection svrr frip=100hz~ 20khz(**) btl -- 65 -- db se -- -- 150 output?voltage?in?mute?mode vo(mute) btl -- -- 250 v se 50 60 -- channel?separation cs rsource=0 ? btl 50 65 -- db se -- -- 1 channel?balance cb btl -- -- 1 db (*) v ? out ?=?|?v out ? ?v out ?| (**)? ???supply?voltage?ripple?rejection?is?measured?at?the?output,?with? a?source?impedance?rsource?=?0
?at? the input?and?with?a?frequency?range?from?20?hz?to?22?khz.?the?ripple?voltage?is?a?sine?wave?with?a?frequency?fripple and?an?amplitude?of?300?mvrms,?which?is?applied?to?the?positive?supply?rail. pin?configurations pin?descriptions pin?no. pin?name description 1 out1+? non?inverted?loudspeaker?output?of?channel?1 2 vcc1 supply?voltage?channels?1?and?2 3 out2- inverted?loudspeaker?output?of?channel?2 4 in2 input?channel?2 5 sgnd signal?ground 6 in1 input?channel?1 7 in3 input?channel?3 8 gnd power?ground 9 stby mode?selection?input:?standby,?mute?and?play 10 svr half?supply?voltage?ripple?rejection 11 in4 input?channel?4 12 civ common?input?voltage?ripple?rejection 13 out3- inverted?loudspeaker?output?of?channel?3 14 vcc2 supply?voltage?channels?1?and?2 15 out4+? non?inverted?loudspeaker?output?of?channel?4
SA7347 hangzhou?microelectronics?co.,ltd ?rev:1.1???????2007.07.27 http:?www.silan.com.cn??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?4?of?9 function?description input?configuration the?formula?of?the?input?cut-off?frequency?is: ) i c i (r 2 1 off) i(cut f = - p for?se?application?rin?=?60k
?and?cin?=?220nf: 12hz ) 9 10 220 3 10 (60 2 1 off) i(cut f = = - b p for?btl?application?rin?=?30k
?and?cin?=?470nf: 11hz ) 9 10 470 3 10 (30 2 1 off) i(cut f = = - b p because? of? high? input?impedance,? large? capacitor? values?for?the?inputs? are? not? necessary.? the?smaller? input capacitor?values?help?to?reduce?the?switch?on?delay?during?charging?of?the?capacitors.?this?results?in?a?good?low frequency?response?and?good?switch?on?behavior. btl?application using?the?SA7347?as?a?btl?amplifier?offers?the?following?advantages: ? ? low?peak?value?of?the?supply?current ? ? ripple?frequency?on?the?supply?voltage?is?twice?the?signal?frequency ? ? good?low?frequency?performance ? ? no?expensive?dc-blocking?capacitor mode?selection by?changing?properly?dc?voltage?of? pin?stby,?SA7347?has?follow?functional?modes?which?can?be?selected?for all?channels. ? ? 0?SA7347? has? a? protection? circuit? based? on? multiple? temperature? measurements:? one measures? local? temperature? of? the? power? stages? and? another? measure? the? global? chip? temperature.? this
SA7347 hangzhou?microelectronics?co.,ltd ?rev:1.1???????2007.07.27 http:?www.silan.com.cn??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?5?of?9 protection?circuit?will?start?to?switch?off?the?bias?of?channel?when?local?temperature?reaches?approximately?185 c or? global? temperature? reaches? approximately? 150 c.? as? a? result,? there? is? low? dissipating? in? the? chip.? it? starts operating?again?when?the?chip?temperature?drop?to?same?value?below?the?die?temperature.?but?if?the?temperature again?begins?to?rise,?the?SA7347?shuts?down?again.?the?process?will?not?stop?until?the?local?temperature?is?under 185 c?and?the?global?temperature?is?under?150 c. this?protects?the?SA7347?against?shorts?to?ground,?to?the?supply?voltage?and?across?the?load,?and?against?too high?chip?temperatures.?however,?not?that?there?are?abnormal?events?as?shorts?to?ground,?to?the?supply?voltage and? across?the? load?in?the? chip,? the? protection? circuit? should? start-up.? in? fact,? just? as?much? as?the? temperature does?not?exceed?the?critical?level,?the?protection?circuit?will?not?operate. power?dissipation?and?heat?sinking proper?heat?sinking?is?necessary?to?ensure?that?SA7347?will?function?correctly?under?all?operating?conditions.?a heat?sink?that?is?too?small?will?cause?the?die?to?heat?excessively?and?will?result?in?a?degraded?output?signal?as?the thermal?protection?circuitry?begins?to?operate. in?order?to?determine?the?appropriate?heat? sink?for?a?given?application,? the?power?dissipation?of? the?SA7347?in that? application? must? be? known.? when? the? load? is? resistive,? the? maximum? average? power? that? the? ic? will? be required?to?dissipate?is?approximately: p d(max) =4*vs 2 /(2 p 2 rl)+pq where?vs?is?the?total?power?supply?voltage?across?the?SA7347,?rl?is?the?load?resistance;?pq?is?the?quiescent power?dissipation?of?the?amplifier.?the?above?equation?is?only?an?approximation?which?assumes?an??ideal??class?b output? stage? and? constant? power? dissipation? in? all? other? parts? of? the? circuit.? as? an? example,? if? the? SA7347? is operated? on? a? 15v? power? supply? with? a? resistive? load? of? 4 w ,? it? can? develop? up? to? 13.5w? of? internal? power dissipation.? if? the? die? temperature? is? to? remain? below? 150 c? for? ambient? temperatures? up? to? 60 c,? the? total junction-to-ambient?thermal?resistance?must?be?less?than: (150 c 60 c)/13.5w 6.7 c?/w using?rth(j-c)?=?1.3 c?/w,?the?sum?of?the?case-to-heat-sink?interface?thermal?resistance?and?the?heat-sink-to- ambient?thermal?resistance?must?be?less?than?5.4 c/w.?the?case-to-heat-sink?thermal?resistance?of?the?hsip-15 package?varies?with?the?mounting?method?used.?a?metal-to-metal?interface?will?be?about?1 c?/w?if?lubricated,?and about?1.5 c?/w?if?dry. 6.7 c?/w-1.3 c?/w-1 c?/w 4.4 c?/w the? thermal? requirements?can? become?more? difficult? when? an? amplifier? is? driving?a?reactive? load.? for? a? given magnitude?of?load?impedance,?a?higher?degree?of?reactance?will?cause?a?higher?level?of?power?dissipation?within the? amplifier.? as? a? general? rule,? the? power? dissipation? of? an? amplifier? driving? a? 60o? reactive? load? (usually considered? to? be? a? worst-case?loudspeaker? load)? will? be?roughly?that? of?the? same? amplifier? driving?the?resistive part?of?that?load.?for?example,?a?loudspeaker?may?at?some?frequency?have?an?impedance?with?a?magnitude?of?8 w and? a? phase? angle? of? 60o.? the? real? part? of? this? load? will? then? be? 4 w ,? and? the? amplifier? power? dissipation? will roughly?follow?the?curve?of?power?dissipation?with?a?4 w ?load.
SA7347 hangzhou?microelectronics?co.,ltd ?rev:1.1???????2007.07.27 http:?www.silan.com.cn??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?6?of?9 typical?application?circuit
SA7347 hangzhou?microelectronics?co.,ltd ?rev:1.1???????2007.07.27 http:?www.silan.com.cn??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?7?of?9 pc?board?and?compinents?layout?of?typical?application?circuit recommended?application?value?of?device next?table?shows?the?recommended?value?corresponding?to?the?components?in?the?typical?application?circuit. components recommended?value purpose cs1 1000 m f cs2 100nf supply?voltage?filtering?and?bypassing cb1 22 m f common?input?voltage?decoupling cb2 150 m f half?supply?voltage?decoupling ci1 ci2 220nf input?ac?coupling?capacitor(se) ci3 470nf input?ac?coupling?capacitor(btl) co1 470 m f output?ac?coupling?capacitor r1 51k w r2 100k w r3 51k w dz 7.5v stby?controller
SA7347 hangzhou?microelectronics?co.,ltd ?rev:1.1???????2007.07.27 http:?www.silan.com.cn??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?8?of?9 package?outline hsip-15 unit:?mm
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