STEVAL-CCA028V1 10 W + 10 W class-D audio amplifier demonstration board Features

STEVAL-CCA028V1 10 W + 10 W class-D audio amplifier demonstration board Features
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.
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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
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