is31ap4991a 1.1w aud io power amplifier with active-low s hutdown mode integrated silicon solution, inc. ? www.issi.com 1 rev. a, 12/31/2014 description the is31ap4991a has been designed for demanding audio applications such as mobile phones and permits the reduction of the number of external components. it is capable of delivering 1.1w of continuous rms output power into an 8 ? load @ 5v. an externally-controlled standby mode reduces the supply current to much less than 1 a. it also includes internal thermal shutdown protection. the unity-gain stable amplifier can be conf igured by external gain setting resistors. features ? operating from v cc = 2.7v ~ 5.5v ? 1.1w output power @ v cc = 5v, thd+n= 1%, f = 1khz, with 8 ? load ? ultra-low consumption in standby mode (much less than 1 a) ? 56db psrr @217hz in grounded mode ? near-zero click-and-pop ? ultra-low distortion (0.074%@0.5w, 1khz) ? sop-8 and msop-8 package quick start figure 1: photo of is31ap4991a evaluation board recommended equipment ? 5.0v, 1a power supply ? audio source (i.e. mp3 player, notebook pc, etc.) ? 8 ? speakers absolute maximum ratings ? 5.5v power supply caution: do not exceed the conditions listed above, otherwise the board will be damaged. procedure the is31ap4991a evaluation board is fully assembled and tested. follow the steps listed below to verify board operation. caution: do not turn on the power supply until all connections are completed. 1) connect an 8 ? (or larger) speaker across the out- terminal and out+ terminal. or connect speaker to the connector (audio out). 2) connect the ground terminal of the power supply to the gnd and the positive terminal to the vcc. or connect dc power to the connector (dc input). 3) if the audio source is differential, connect the negative of the audio source to the in- terminal, and connect the positive of the audio source to in+ terminal. 4) if the audio source is single-ended, c3 and r1 should disconnect, and r3 should be 0 ? . connect the audio source to the in- terminal, or connect audio source to the connector (audio input). 5) turn on the power supply. 6) turn on the audio source. ordering information part no. temperature range package is31ap4991a-grls2-eb is31ap4991a-sls2-eb -40c ~ +85c (industrial) sop-8, lead-free msop-8, lead-free table1: ordering information for pricing, delivery, and ordering information, please contacts issi?s analog marketing team at analog@issi.com or (408) 969-6600.
is31ap4991a 1.1w aud io power amplifier with active-low s hutdown mode integrated silicon solution, inc. ? www.issi.com 2 rev. a, 12/31/2014 evaluation board operation the is31ap4991a demo board features the is31ap4991a class-ab power amplifier ic, designed to drive speaker impedance of 8 ? or larger. customizing the gain the is31ap4991a demo board is shipped with a gain of 6db and is set by resistors r i (r 1 , r 2 ) and r f (r 3 , r 4 ). change resistors r i and r f to reconfigure the gain of the board and gain determined in equation (1): ? ? ? ? ? ? ? ? v v r i f r ain 2 g (1) high-pass filter the input capacitor c i (c 3 , c 4 ) and input resistor r i (r 1 , r 2 ) form a high-pass filter with the corner frequency, f c , determined in equation (2) and refer to is31ap4991a datasheet for more detail. ?? i i c r c f ? 2 1 ? (2) shutdown mode jumper (jp1) controls the shutdown pin of the is31ap4991a ic. connect the jumper (jp1) to enter the shutdown mode of the board. c7 0.47uf c3 100nf c4 100nf vcc r2 20k r5 100k r4 20k jp1 close= sd vcc c2 1uf r3 20k r1 20k sdb 1 byp ass 2 in+ 3 in- 4 out- 5 vcc 6 gnd 7 out+ 8 u1 is31ap4991a-grls2 c6 nc c5 nc con2 audio in con3 audio out out+ tp5 out- tp6 vcc c1 10uf con1 dc in tp1 tp2 tp3 tp4 in- sdb 1 byp ass 2 in+ 3 in- 4 out- 5 vcc 6 gnd 7 out+ 8 u2 is31ap4991a-sls2 vcc c8 1uf inp inp inn by pa ss sdb sdb by pa ss inn out- out+ in- in+ figure 2: is31ap4991a application schematic
is31ap4991a 1.1w aud io power amplifier with active-low s hutdown mode integrated silicon solution, inc. ? www.issi.com 3 rev. a, 12/31/2014 bill of materials name symbol description qty supplier part no. amplifier u1 class- ab power amplifier 1 issi is31ap4991a resistor r1,r2,r3,r4 res,20k,1/16w ,1%,smd 4 yageo rc0603fr-0720kl resistor r5 res,100k,1/16w,5 %,smd 1 yageo rc0603jr-07100kl capacitor c1 cap,10f,16v,20%,s md 1 yageo cc 0805kkx7r6bb106 capacitor c2,c8 cap, 1f, 50v, 10%,smd 1 yageo cc0603kkx7r9bb105 capacitor c3,c4 cap,0.1f,50v,10% ,smd 2 yageo cc0603kkx7r9bb104 capacitor c7 cap,0.47f,50v,10% ,smd 1 yageo cc0603kkx7r9bb474 connector j2 2.5 mm dc connector 1 connector j3,j4 rca ?type connector 2 connector j7,j8 3.5mm min connector 2 u2,c5,c6, not installed 3 bill of materials, refer to figure 2 above.
is31ap4991a 1.1w aud io power amplifier with active-low s hutdown mode integrated silicon solution, inc. ? www.issi.com 4 rev. a, 12/31/2014 0 0 0 0 2 2 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 2 1 figure 3: board component placement guide - top layer figure 4: board pcb layout - top layer
is31ap4991a 1.1w aud io power amplifier with active-low s hutdown mode integrated silicon solution, inc. ? www.issi.com 5 rev. a, 12/31/2014 0 0 0 0 2 2 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 2 1 figure 5: board component placement guide - bottom layer figure 6: board pcb layout - bottom layer copyright ? ? ? 2014 ? integrated ? silicon ? solution, ? inc. ? all ? rights ? reserved. ? issi ? reserves ? the ? right ? to ? make ? changes ? to ? this ? specification ? and ? its ? products ? at ? any ? time ? without ? notice. ? issi ? assumes ? no ? liability ? arising ? out ? of ? the ? application ? or ? use ? of ? any ? information, ? products ? or ? services ? described ? herein. ? customers ? are ? advised ? to ? obtain ? the ? latest ? version ? of ? this ? device ? specification ? before ? relying ? on ? any ? published ? information ? and ? before ? placing ? orders ? for ? products. ? integrated ? silicon ? solution, ? inc. ? does ? not ? recommend ? the ? use ? of ? any ? of ? its ? products ? in ? life ? support ? applications ? where ? the ? failure ? or ? malfunction ? of ? the ? product ? can ? reasonably ? be ? expected ? to ? cause ? failure ? of ? the ? life ? support ? system ? or ? to ? significantly ? affect ? its ? safety ? or ? effectiveness. ? products ? are ? not ? authorized ? for ? use ? in ? such ? applications ? unless ? integrated ? silicon ? solution, ? inc. ? receives ? written ? assurance ? to ? its ? satisfaction, ? that: ? a.) ? the ? risk ? of ? injury ? or ? damage ? has ? been ? minimized; ? b.) ? the ? user ? assume ? all ? such ? risks; ? and ? c.) ? potential ? liability ? of ? integrated ? silicon ? solution, ? inc ? is ? adequately ? protected ? under ? the ? circumstances
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