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PDF TDA7498 Data sheet ( Hoja de datos )
| Número de pieza | TDA7498 | |
| Descripción | 100-watt + 100-watt dual BTL class-D audio amplifier | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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TDA7498
100-watt + 100-watt dual BTL class-D audio amplifier
Features
■ 100-W + 100-W output power at
THD = 10% with RL = 6 Ω and VCC = 36 V
■ 80-W + 80-W output power at
THD = 10% with RL = 8 Ω and VCC = 34 V
■ Wide-range single-supply operation (14 - 39 V)
■ High efficiency (η = 90%)
■ Four selectable, fixed gain settings of
nominally 25.6 dB, 31.6 dB, 35.1 dB and
37.6 dB
■ Differential inputs minimize common-mode
noise
■ Standby and mute features
■ Short-circuit protection
■ Thermal overload protection
■ Externally synchronizable
PowerSSO36
with exposed pad up
Description
The TDA7498 is a dual BTL class-D audio
amplifier with single power supply designed for
home systems and active speaker applications.
It comes in a 36-pin PowerSSO package with
exposed pad up (EPU) to facilitate mounting a
separate heatsink.
Table 1. Device summary
Order code
Operating temp. range
Package
TDA7498
-40 to 85 °C
PowerSSO36 (EPU)
TDA7498TR
-40 to 85 °C
PowerSSO36 (EPU)
Packaging
Tube
Tape and reel
September 2011
Doc ID 16107 Rev 8
1/28
www.st.com
28
1 page  
TDA7498
Device block diagram
Device block diagram
Figure 1 shows the block diagram of one of the two identical channels of the TDA7498.
Figure 1. Internal block diagram (showing one channel only)
Doc ID 16107 Rev 8
5/28
5 Page 
3
3.1
Characterizations
Test circuit
Figure 3 shows the test circuit with which the characterization curves, shown in the next sections, were measured. Figure 4 shows
the PCB layout.
Figure 3.
Test circuit for characterizations
J1
INPUT
3 L-
4 L+
1 R-
2 R+
C1
1uF
C2
1uF
C5
100nF
For R7
J7 Single-Ended 22R
Input
C6
100nF
1 SUB_GND
22 INPA
C3
1nF 23 INNA
C4
1nF 27 SGND
VDDS 26 VDDS
R1 28 DIAG
100k
DIAG
19 VDDPW
18 PGND
OUTPA 16
OUTPA 17
PGNDA 14
PGNDA 15
R6
22R
C25
100nF
PVCCA 12
PVCCA 13
OUTNA 10
OUTNA 11
C30
1uF
C27
330pF
FREQUENCY SHIFT
Q1 R9
KTC3875(S) 180K
R13
3
C8
FS
47k
1
2
R14
100nF
100k
25 SYNCLK
R3
39K 24 ROSC
J5 30 GAIN0
VDDS
31 GAIN1
IC1
TDA7498
OUTPB
OUTPB
3
2
PVCCB 7
PVCCB 6
R5
22R
For
J8
Single-Ended
Input
J6
35 SVCC
C10
100nF 36 VSS
C19
100nF
PGNDB 5
PGNDB 4
C31
1uF
C11
3V3
3V3
FS
J4
1uF
C12
S2 MUTE 1uF
12
3
S1 STBY
12
3
R4
120k +
R2
33k +
OUT
IC2 IN
1 L4931CZ33 3
C29
2.2uF
2 GND C9
100nF
R8 VCC
6.8k
D1
18V
32 INPB
C13
1nF 33 INNB
C14
1nF 21 MUTE
C15
2.2uF
16V
20
STBY
C7
2.2uF
16V
3V3 POWER SUPPLY
OUTNB 9
OUTNB 8
C21
330pF
TDA7498
VREF 34
SVR 29
C17
10uF
10V
C16
10uF
10V
CLASS-D AMPLIFIER
L4
*22uH
*
C28
220nF
*C26
*680nF
C24
220nF
L3
* 22uH
L1
* 22uH
2200uF
C23+
50V
*C18
220nF
L2
* 22uH
*C20
680nF
*C22
220nF
R15
8R
C40
220nF
C41
220nF
R16
8R
J3
OUTPUT
Load = 6 ohm
L+
L- 1
R-2
R+3
4
1 VCC
2 GND
J2
R17
8R
C42
220nF
C43
220nF
R18
8R
LC FILTER COMPONENTS
Load
6 ohm
L1,L2,L3,L4
22 uH
C20,C26 C18,C22,C24,C28
680 nF
220 nF
8 ohm
22 uH
470 nF
220 nF
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet TDA7498.PDF ] | |
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