ST TDA7498MV User Manual
100-watt mono BTL class-D audio amplifier
Features
100-W output power at
THD = 10% with R
80-W output power at
THD = 10% with R
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
= 6 Ω and V
L
= 8 Ω and V
L
CC
CC
= 36 V
= 34 V
TDA7498MV
PowerSSO-36
with exposed pad up
Description
The TDA7498MV is a mono 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 Temperature range Package Packaging
TDA7498MV -40 to 85 °C PowerSSO-36 (EPU) Tube
TDA7498MVTR -40 to 85 °C PowerSSO-36 (EPU) Tape and reel
January 2011 Doc ID 16505 Rev 3 1/27
www.st.com
27
Contents TDA7498MV
Contents
1 Device block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Pin-out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Pin list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.3 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.4 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4 Characterization curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1 Test board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.2 Characterization curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2.1 For RL = 6 Ω . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
4.2.2 For R
= 8 Ω . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
L
5 Applications information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.1 Applications circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.2 Mode selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.3 Gain setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.4 Input resistance and capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.5 Internal and external clocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.5.1 Master mode (internal clock) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.5.2 Slave mode (external clock) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.6 Output low-pass filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.7 Protection function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.8 Diagnostic output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2/27 Doc ID 16505 Rev 3
TDA7498MV List of figures
List of figures
Figure 1. Internal block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2. Pin connection (top view, PCB view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 3. Test board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 4. Output power (THD = 10%) vs supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 5. THD vs output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 6. THD vs frequency (1 W) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 7. THD vs frequency (100 mW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 8. Frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 9. FFT performance (0 dBFS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 10. FFT performance (-60 dBFS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 11. Output power (THD = 10%) vs supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 12. THD vs output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 13. THD vs frequency (1 W) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 14. THD vs frequency (100 mW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 15. Frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 16. FFT performance (0 dB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 17. FFT performance (-60 dB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 18. Applications circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 19. Standby and mute circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 20. Turn-on/off sequence for minimizing speaker “pop” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 21. Input circuit and frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 22. Master and slave connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 23. Typical LC filter for a 8-Ω speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 24. Typical LC filter for a 6-Ω speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 25. Behavior of pin DIAG for various protection conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 26. PowerSSO-36 EPU outline drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Doc ID 16505 Rev 3 3/27
List of tables TDA7498MV
List of tables
Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Pin description list. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 3. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 4. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 5. Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 6. Electrical specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 7. Mode settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Table 8. Gain settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 9. How to set up SYNCLK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Table 10. PowerSSO-36 EPU dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 11. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4/27 Doc ID 16505 Rev 3
TDA7498MV Device block diagram
1 Device block diagram
Figure 1 shows the block diagram of the TDA7498MV.
Figure 1. Internal block diagram
Doc ID 16505 Rev 3 5/27
Pin description TDA7498MV
2 Pin description
2.1 Pin-out
Figure 2. Pin connection (top view, PCB view)
36
35
34
33
32
31
30
29
28
27
26
25
24
VSS
SVCC
VREF
SGND2
VDDS2
GAIN1
GAIN0
SVR
DIAG
SGND
VDDS
SYNCLK
ROSC
SUB_GND
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
OUTN
OUTN
PVCC
PVCC
1
2
3
4
5
6
7
8
9
10
11
12
13
23
INN
22
INP
21
MUTE
20
STBY
19
VDDPW
6/27 Doc ID 16505 Rev 3
EP, exposed pad
Connect to ground
PGND
PGND
OUTP
OUTP
PGND
14
15
16
17
18
TDA7498MV Pin description
2.2 Pin list
Table 2. Pin description list
Number Name Type Description
1 SUB_GND PWR Connect to the frame
2,3 N.C. - No internal connection
4,5 N.C. - No internal connection
6,7 N.C. - No internal connection
8,9 N.C. - No internal connection
10,11 OUTN O Negative PWM output for audio channel
12,13 PVCC PWR Power supply for audio channel
14,15 PGND PWR Power stage ground
16,17 OUTP O Positive PWM output for audio channel
18 PGND PWR Power stage ground
19 VDDPW O
3.3-V (nominal) regulator output referred to ground for power
stage
20 STBY I Standby mode control
21 MUTE I Mute mode control
22 INP I Positive differential input
23 INN I Negative differential input
24 ROSC O Master oscillator frequency-setting pin
25 SYNCLK I/O Clock in/out for external oscillator
26 VDDS O
3.3-V (nominal) regulator output referred to ground for signal
blocks
27 SGND PWR Signal ground
28 DIAG O Open-drain diagnostic output
29 SVR O Supply voltage rejection
30 GAIN0 I Gain setting input 1
31 GAIN1 I Gain setting input 2
32 VDDS2 O Connect to VDDS (pin 26)
33 SGND2 PWR Connect to SGND (pin 27)
34 VREF O Half VDDS (nominal) referred to ground
35 SVCC PWR Signal power supply decoupling
36 VSS O 3.3-V (nominal) regulator output referred to power supply
- EP - Exposed pad for heatsink, to be connected to ground
Doc ID 16505 Rev 3 7/27
Electrical specifications TDA7498MV
3 Electrical specifications
3.1 Absolute maximum ratings
Table 3. Absolute maximum ratings
Symbol Parameter Value Unit
V
CC_MAX
V
L_MAX
T
j_MAX
T
op_MAX
T
stg
DC supply voltage for pins PVCCA, PVCCB 44 V
Voltage limits for input pins STBY, MUTE, INNA, INPA,
INNB, INPB, GAIN0, GAIN1
Operating junction temperature 0 to 150 °C
Operating temperature -40 to 85 °C
Storage temperature -40 to 150 °C
-0.3 to 3.6 V
Warning: Stresses beyond those listed under “Absolute maximum
ratings” make cause permanent damage to the device. These
are stress ratings only, and functional operation of the device
at these or any other conditions beyond those indicated
under “Recommended operating condition” are not implied.
Exposure to absolute-maximum-rated conditions for
extended periods may affect device reliability. In the real
application, power supply with nominal value rated inside
recommended operating conditions, may experience some
rising beyond the maximum operating condition for short
time when no or very low current is sinked (amplifier in mute
state). In this case the reliability of the device is guaranteed,
provided that the absolute maximum rating is not exceeded.
3.2 Thermal data
Table 4. Thermal data
Symbol Parameter Min Typ Max Unit
R
th j-case
Thermal resistance, junction to case - 2 3 °C/W
3.3 Recommended operating conditions
Table 5. Recommended operating conditions
Symbol Parameter Min Typ Max Unit
V
CC
T
amb
8/27 Doc ID 16505 Rev 3
Supply voltage for pins PVCCA, PVCCB 14 - 39 V
Ambient operating temperature -20 - 85 °C
TDA7498MV Electrical specifications
3.4 Electrical specifications
Unless otherwise stated, the results in Ta bl e 6 below are given for the conditions:
V
=36V, RL (load) = 6 Ω, R
CC
Ta mb = 25 ° C.
Table 6. Electrical specifications
Symbol Parameter Condition Min Typ Max Unit
= R3 = 39 kΩ, C8 = 100 nF, f = 1 kHz, GV = 25.6 dB and
OSC
I
q
I
qSTBY
V
OS
I
OCP
T
jS
R
i
V
OVP
V
UVP
R
dsON
P
o
P
o
P
D
Total quiescent current No LC filter, no load - 40 60 mA
Quiescent current in standby - - 1 10 µA
Output offset voltage
Overcurrent protection threshold RL = 0 Ω 5.5 7 - A
Junction temperature at thermal
shutdown
Input resistance Differential input 48 60 - kΩ
Overvoltage protection threshold - 42 43 - V
Undervoltage protection
threshold
Power transistor on resistance
Output power
Output power
Dissipated power
η Efficiency P
THD Total harmonic distortion P
G
∆G
V
V
Closed-loop gain
Gain matching - -1 - 1 dB
eN Total input noise
SVRR Supply voltage rejection ratio
T
f
r
SW
, T
Rise and fall times - - 50 - ns
f
Switching frequency Internal oscillator 290 310 330 kHz
Play mode -100 - 100
mV
Mute mode -60 - 60
- - 150 - °C
- --8V
High side - 0.2 -
Ω
Low side - 0.2 -
THD = 10% - 100 -
W
THD = 1% - 78 -
= 8 Ω, THD = 10%,
R
L
VCC= 36V
P
= 100 W,
o
THD = 10%
= 100 W - 90 - %
o
= 1 W - 0.1 - %
o
-80-W
-10-W
GAIN0 = L, GAIN1 = L 24.6 25.6 26.6
GAIN0 = L, GAIN1 = H 30.6 31.6 32.6
dB
GAIN0 = H, GAIN1 = L 34.1 35.1 36.1
GAIN0 = H, GAIN1 = H 36.6 37.6 38.6
A Curve, G
= 20 dB - 15 -
V
µV
f = 22 Hz to 22 kHz - 25 50
fr = 100 Hz, Vr = 0.5 Vpp,
= 10 µF
C
SVR
-70-dB
Doc ID 16505 Rev 3 9/27
Loading...