ST CCA028V1 User Manual

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%, 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

Data brief

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	1/4
For further information contact your local STMicroelectronics sales office.		www.st.com

Schematic	STEVAL-CCA028V1

1 Schematic

Figure 1. Circuit schematic

1 SUB_GND

OUTPA 16

L4

C3

22

INPA

OUTPA 17

C1 470nF

PGNDA

14

R6

C28

1nF

23

INNA

PGNDA

15

22R

100nF

C2 470nF

C4

1nF

27

SGND

C25

J3

C5

26

VDDS

100nF

Q)

2

287 /

100nF

R1 100k28

DIAG

PVCCA

12

C27

1

287 /

R7

C24

PVCCA

13

330pF

19 VDDPW

100nF

22R

OUTNA

10

L3

)RU 6LQJOH (QGHG

C6

Input

OUTNA

11

-

100nF

18

PGND

J2

C30C31 C32C33

IC1

C23 +

1

9&&

25

10uF 16V+ + + +

2

SYNCLK

SYNCLK

TDA7492P

OPTION

470uF

*1'

J1

24

OUTPB

3

25V

ROSC

OUTPB

2

1,1 /

(TDA7491P/LP/HV)

L1

,1 /

C8

R3

- 30

2

GAIN0

PVCCB

7

C18

3,1 5

100nF

39K

R5

,1 5

VDDS

31

PVCCB

6

100nF

J4

4

GAIN1

22R

1

C19

-

35

SVCC

&

2

287 5

)RU 6LQJOH (QGHG ,QSXW

100nF

Q)

287 5

-

C10

PGNDB

5

C21

100nF 36

VSS

C22

PGNDB

4

330pF

100nF

C11 470nF

32

INPB

OUTNB

9

L2

C13

C12 470nF

OUTNB

8

1nF 33

INNB

3V3

C14

VREF

34

6 087(

21 MUTE

1

2

1nF

C17

LC FILTER COMPONENT

3

C15

+

R433k

+

1uF

6 67%<

2.2uF

20 STBY

SVR

29

Load

L1,L2,L3,L4

C20,C26

1

2

16V

16V

3

R2 N +

C7

+

C16

4 ohm

15 uH

470 nF

2.2uF

1uF

IN

5 VCC

16V

6 ohm

22 uH

220 nF

OUT

,&

16V

&1

L4931CZ33 3

N

8 ohm

33 uH

220 nF

X)

2 GND

&

R13

7'$ 3

Q) 9.1k

16 ohm

68 uH

220 nF

&/$66 ' $03/,),(5

9 32:(5 6833/<

2/4	Doc ID 022324 Rev 1