data brief for further information contact your local stmicroelectronics sales office. october 2011 doc id 022324 rev 1 1/4 4 steval-CCA028V1 10 w + 10 w class-d audio amplifier demonstration board based on the tda7491p features 10 w +10 w continuous output power at thd = 10%, r l = 6 ? , v cc = 11 v 9.5 w + 9.5 w continuous output power at thd = 10%, r l = 8 ?, v cc = 12 v wide-range single-supply operation (5-18 v) high efficiency ( = 90 %) four selectable, fixed gain settings (20 db, 26 db, 30 db and 32 db) differential inputs to minimize common-mode noise filterless operation standby and mute features short-circuit and thermal overload protections externally synchronizable rohs compliant description the steval-CCA028V1 demonstration board is designed for the tda7491p high-power dual btl class-d audio amplifier. thanks to its high efficiency, the device assembled in the psso36 (slug-down) package is capable of dissipating heat without any heatsink. jumpers on the board allow configuring the amplifier in order to verify all the features as single-ended or differential inputs, fixed gain settings. microswitches are also provided to enable the standby and mute functions. steval-CCA028V1 www.st.com
schematic steval-CCA028V1 2/4 doc id 022324 rev 1 1 schematic figure 1. circuit schematic , 1 / , 1 / , 1 5 , 1 5 9 & & * 1 ' 2 8 7 / 2 8 7 / 2 8 7 5 2 8 7 5 7 ' $ 3 lc filter component load l1,l2,l3,l4 c20,c26 4 ohm 6 ohm 8 ohm 15 uh 22 uh 33 uh 220 nf 220 nf 470 nf 0 8 7 ( 6 7 % < 9 3 2 : ( 5 6 8 3 3 / < ) r u 6 l q j o h ( q g h g ) r u 6 l q j o h ( q g h g , q s x w
input synclk vdds vcc 3v3 16 ohm 68 uh 220 nf & / $ 6 6 ' $ 0 3 / , ) , ( 5 (tda7491p/lp/hv) option + c23 470uf 25v c5 100nf r3 39k l4 c1 470nf c2 470nf c11 470nf c12 470nf c8 100nf c25 100nf c19 100nf c27 330pf r6 22r l3 c28 100nf c24 100nf l1 c21 330pf r5 22r l2 c18 100nf c22 100nf c3 1nf c4 1nf c13 1nf c14 1nf 32 inpb 36 vss 9 outnb 5 pgndb 7 pvccb 3 outpb 10 outna 12 pvcca 14 pgnda 16 outpa 33 innb 8 outnb 4 pgndb 21 mute 6 pvccb 2 outpb 29 svr 11 outna 1 sub_gnd 22 inpa 23 inna 27 sgnd 26 vdds 28 diag 19 vddpw 18 pgnd 20 stby 24 rosc 31 gain1 35 svcc 30 gain0 25 synclk 17 outpa 15 pgnda 34 vref 13 pvcca ic1 tda7492p r1 100k r7 22r c6 100nf r4 33k r2 n 5 n & q ) c10 100nf & q ) - - 2 1 3 6 2 1 3 6 & q ) & x ) 2 gnd 1 out 3 in , & l4931cz33 + c15 2.2uf 16v 1 2 j4 1 2 j3 1 2 j2 - - 1 3 2 4 j1 + c7 2.2uf 16v + c16 1uf 16v + c17 1uf 16v r13 9.1k + c30 10uf 16v + c31 + c32 + c33
steval-CCA028V1 revision history doc id 022324 rev 1 3/4 2 revision history table 1. document revision history date revision changes 05-oct-2011 1 initial release.
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