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%, RL = 6 Ω, VCC = 11 V ■ 9.5 W + 9.5 W continuous output power at THD = 10%, RL = 8 Ω, VCC = 12 V ■ Wide-range single-supply operation (5-18 V) ■ High efficiency (η = 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 STEVAL-CCA028V1 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 For further information contact your local STMicroelectronics sales office. 1/4 www.st.com 4 Schematic STEVAL-CCA028V1 1 Schematic Figure 1. Circuit schematic C3 1nF C4 1nF C1 470nF C2 470nF C5 100nF )RU6LQJOH(QGHG - C6 100nF ,15 ,15 4 3 R3 39K - VDDS 31 GAIN1 - )RU6LQJOH(QGHG,QSXW C10 100nF - C11 470nF C13 C12 470nF 3V3 1nF C14 6 087( 1 3 2 1 3 2 6 67%< OUT & 1 X) ,& IN L4931CZ33 3 2 GND 1nF R4 33k + R2 N + 5 VCC N & R13 Q) 9.1k 932:(56833/< 2/4 33 INNB 21 MUTE C15 2.2uF 16V 20 STBY C7 2.2uF 16V C27 330pF OUTNA 10 OUTNA 11 L3 2 287/ 287/ IC1 TDA7492P (TDA7491P/LP/HV) OUTPB 3 OUTPB 2 C24 100nF J2 C30 C31 C32 C33 C23 + 10uF 16V+ + + + 470uF OPTION 25V L1 PVCCB 7 PVCCB 6 C18 100nF R5 22R OUTNB 9 OUTNB 8 L2 9&& 2 *1' J4 C21 330pF 1 1 & Q) C19 100nF PGNDB 5 PGNDB 4 32 INPB J3 & Q) PVCCA 12 PVCCA 13 35 SVCC 36 VSS C28 100nF R6 22R 1 18 PGND 30 GAIN0 C25 100nF DIAG 24 ROSC C8 100nF L4 27 SGND 25 SYNCLK ,1/ ,1/ PGNDA 14 PGNDA 15 19 VDDPW SYNCLK 2 23 INNA R1 100k 28 J1 1 OUTPA 16 OUTPA 17 26 VDDS R7 22R Input 1 SUB_GND 22 INPA 2 2875 2875 C22 100nF VREF 34 + SVR 29 + 7'$3 &/$66'$03/,),(5 Doc ID 022324 Rev 1 C17 1uF 16V C16 1uF 16V LC FILTER COMPONENT Load L1,L2,L3,L4 C20,C26 4 ohm 15 uH 470 nF 6 ohm 22 uH 220 nF 8 ohm 33 uH 220 nF 16 ohm 68 uH 220 nF STEVAL-CCA028V1 2 Revision history Revision history Table 1. Document revision history Date Revision 05-Oct-2011 1 Changes Initial release. Doc ID 022324 Rev 1 3/4 STEVAL-CCA028V1 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. 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