STEVAL-CCA028V1 10 W + 10 W class-D audio amplifier demonstration board based on the TDA7491P Data brief Features 10 W +10 W continuous output power at THD = 10%, R = 6 , V = 11 V L CC 9.5 W + 9.5 W continuous output power at THD = 10%, R = 8 , V = 12 V L CC 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 STEVAL-CCA028V1 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. October 2011 Doc ID 022324 Rev 1 1/4 For further information contact your local STMicroelectronics sales office. www.st.com 4 Schematic STEVAL-CCA028V1 1 Schematic Figure 1. Circuit schematic 1 L4 SUB GND 16 OUTPA 22 INPA 17 OUTPA C3 C28 C1 470nF R6 14 PGNDA 1nF 23 INNA 100nF 22R 15 PGNDA C4 C2 470nF 1nF J3 27 SGND C25 2 C5 26 VDDS 100nF / 7 1 100nF R1 / 7 28 100k DIAG 12 PVCCA C27 C24 R7 13 PVCCA 330pF 100nF 22R 19 VDDPW ( H 10 OUTNA L3 C6 Input 11 OUTNA 100nF 18 PGND J2 C33 C30C31 C32 1 IC1 C23 10uF 16V + 2 25 SYNCLK + + + + 470uF SYNCLK OPTION TDA7492P 25V J1 3 OUTPB 24 ROSC / ,1 1 2 OUTPB L1 (TDA7491P/LP/HV) / ,1 2 C8 R3 30 GAIN0 7 C18 PVCCB 5 ,1 3 100nF 39K R5 100nF 6 5 ,1 PVCCB VDDS 4 J4 31 GAIN1 22R 1 5 7 35 C19 2 SVCC , ( H 5 7 100nF C10 PGNDB 5 36 VSS C21 100nF C22 PGNDB 4 330pF 100nF 470nF 32 INPB C11 9 OUTNB L2 C13 8 OUTNB C12 1nF 470nF 33 INNB 3V3 C14 (7 VREF 34 1 1nF 21 2 MUTE + C17 3 LC FILTER COMPONENT + C15 1uF R4 33k 2.2uF 16V 1 20 29 2 STBY SVR Load L1,L2,L3,L4 C20,C26 16V 3 + C7 R2 + C16 4 ohm 15 uH 470 nF 2.2uF 1uF VCC 16V OUT ,& IN 16V 6 ohm 22 uH 220 nF L4931CZ33 1 3 8 ohm 33 uH 220 nF GND R13 2 9.1k 16 ohm 68 uH 220 nF 3 0 ( : 2/4 Doc ID 022324 Rev 1 9 32 5 6833/< &/ 66 /,),(5 Q) X) & 7 3 N & 5 N 67%< 6 08 6 - 28 Q) )RU 6L QJO QGHG QSXW 28 - & - *1 9&& - )RU 6L QJO QGHG 28 28 Q) &