160-watt + 160-watt dual btl class-d audio amplifier · 160-watt + 160-watt dual btl class-d audio...
TRANSCRIPT
Preliminary data
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
December 2011 Doc ID 022595 Rev 1 1/20
20
TDA7498E
160-watt + 160-watt dual BTL class-D audio amplifier
Features■ 160-W + 160-W output power at
THD = 10% with RL = 4 Ω and VCC = 36 V
■ 1 x 220 W output power mono parallel BTL at THD = 10% with RL = 3 Ω and VCC = 36 V
■ Wide-range single-supply operation (14 - 36 V)
■ High efficiency (η = 85%)
■ Parallel BTL function using the MODE pin
■ Four selectable, fixed gain settings of nominally 23.8 dB, 29.8 dB, 33.3 dB and 35.8 dB
■ Differential inputs minimize common-mode noise
■ Standby and mute features
■ Smart protection
■ Thermal overload protection
■ Small offset less than 20 mV
DescriptionThe TDA7498E is a dual BTL class-D audio amplifier with a 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.
PowerSSO36with exposed pad up
Table 1. Device summary
Order code Operating temp. range Package Packaging
TDA7498E 0 to 70 °C PowerSSO36 (EPU) Tube
TDA7498ETR 0 to 70 °C PowerSSO36 (EPU) Tape and reel
www.st.com
Contents TDA7498E
2/20 Doc ID 022595 Rev 1
Contents
1 Device block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1 Pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Pin list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.3 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.4 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.5 Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4 Characterization curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1 For RL = 4 Ω, stereo configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.2 For RL = 3 Ω, mono BTL configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.1 Stereo and mono BTL operation selection using the MODE pin . . . . . . . 16
5.2 Gain setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.3 Smart protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
TDA7498E List of figures
Doc ID 022595 Rev 1 3/20
List of figures
Figure 1. Internal block diagram (showing one channel only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Figure 2. Pin connections (top view, PCB view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Figure 3. Test circuit stereo application and mono BTL mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Figure 4. Output power vs. supply voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Figure 5. THD vs. output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Figure 6. THD vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Figure 7. FFT performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Figure 8. Crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Figure 9. Output power vs. supply voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Figure 10. THD vs. output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Figure 11. THD vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Figure 12. PowerSSO36 EPU outline drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Device block diagram TDA7498E
4/20 Doc ID 022595 Rev 1
1 Device block diagram
Figure 1 shows the block diagram of one of the two identical channels of the TDA7498E.
Figure 1. Internal block diagram (showing one channel only)
TDA7498E Pin description
Doc ID 022595 Rev 1 5/20
2 Pin description
2.1 Pinout
Figure 2. Pin connections (top view, PCB view)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
28
29
30
31
32
33
34
35
36
19
20
21
22
23
24
25
26
27
VSS SUB_GND
OUTPB
OUTPB
PGNDB
PGNDB
PVCCB
PVCCB
OUTNB
OUTNB
OUTNA
OUTNA
PVCCA
PVCCA
PGNDA
PGNDA
OUTPA
OUTPA
PGNDVDDPW
STBY
MUTE
INPA
INNA
ROSC
SYNCLK
VDDS
SGND
DIAG
SVR
GAIN
MODE
INPB
INNB
VREF
SVCC
EP, exposed padConnect to ground
Pin description TDA7498E
6/20 Doc ID 022595 Rev 1
2.2 Pin list
Table 2. Pin description list
Number Name Type Description
1 SUB_GND PWR Connect to the frame
2,3 OUTPB O Positive PWM for right channel
4,5 PGNDB PWR Power stage ground for right channel
6,7 PVCCB PWR Power supply for right channel
8,9 OUTNB O Negative PWM output for right channel
10,11 OUTNA O Negative PWM output for left channel
12,13 PVCCA PWR Power supply for left channel
14,15 PGNDA PWR Power stage ground for left channel
16,17 OUTPA O Positive PWM output for left channel
18 PGND PWR Power stage ground
19 VDDPW O3.3-V (nominal) regulator output referred to ground for power stage
20 STBY I Standby mode control
21 MUTE I Mute mode control
22 INPA I Positive differential input of left channel
23 INNA I Negative differential input of left channel
24 ROSC O Master oscillator frequency-setting pin
25 SYNCLK I/O Clock in/out for external oscillator
26 VDDS O3.3-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 GAIN I Gain setting input
31 MODE I Enables stereo or mono BTL mode of operation
32 INPB I Positive differential input of right channel
33 INNB I Negative differential input of right channel
34 VREF O Half VDDS (nominal) referred to ground
35 SVCC PWR Signal power supply
36 VSS O 3.3-V (nominal) regulator output referred to power supply
- EP - Exposed pad for heatsink, to be connected to ground
TDA7498E Electrical specifications
Doc ID 022595 Rev 1 7/20
3 Electrical specifications
3.1 Absolute maximum ratings
3.2 Thermal data
3.3 Recommended operating conditions
Table 3. Absolute maximum ratings
Symbol Parameter Value Unit
VCC DC supply voltage for pins PVCCA, PVCCB, SVCC 40 V
VIVoltage limits for input pins STBY, MUTE, INNA, INPA, INNB, INPB, GAIN, MODE
-0.3 to 4.0 V
Tj Operating junction temperature 0 to 150 °C
Top Operating ambient temperature 0 to 70 °C
Tstg Storage temperature -40 to 150 °C
Table 4. Thermal data
Symbol Parameter Min Typ Max Unit
Rth j-case Thermal resistance, junction to case - 3.0 °C/W
Table 5. Recommended operating conditions
Symbol Parameter Min Typ Max Unit
VCC Supply voltage for pins PVCCA, PVCCB, SVCC 14 - 36 V
Tamb Ambient operating temperature 0 - 70 °C
Electrical specifications TDA7498E
8/20 Doc ID 022595 Rev 1
3.4 Electrical specificationsUnless otherwise stated, the values in the table below are specified for the conditions: VCC = 36 V, RL = 4 Ω, ROSC = R3 = 39 kΩ, C8 = 100 nF, f = 1 kHz, GV = 23.6 dB Tamb = 25 °C.
Table 6. Electrical specifications
Symbol Parameter Condition Min Typ Max Unit
Iq Total quiescent current No LC filter, no load - 60 mA
IqSTBY Quiescent current in standby - - 1 µA
VOS Output offset voltage Vi = 0 Av = 23.6 dB, no load
-20 - 20 mV
IOCP Overcurrent protection threshold RL = 0 Ω 10 11 14 A
TjJunction temperature at thermal shutdown
- 140 150 160 °C
Ri Input resistance Differential input 69 - kΩ
VUVP Undervoltage protection threshold - - - 8 V
RdsON Power transistor on resistanceHigh side - 0.15 -
ΩLow side - 0.15 -
Po Output powerTHD = 10% - 160 -
WTHD = 1% - 125 -
PoParallel BTL (mono) output power, RL = 3 ohm, Vcc = 36 V
THD = 10% - 220 -W
THD = 1% - 170 -
η Efficiency - 85 - %
THD Total harmonic distortion Po = 1 W - 0.05 - %
GV Closed-loop gain
GAIN0 < 0.25*VDD 23.8
dB0.25*VDD < GAIN < 0.5*VDD 29.8
0.5*VDD < GAIN < 0.75*VDD 33.3
GAIN > 0.75*VDD 35.8
ΔGV Gain matching - -1 - 1 dB
CT Crosstalk f = 1 kHz, Po = 1 W 50 60 - dB
Vn Total output noise
Inputs shorted and to Ground A curve
231 µV
Inputs shorted and to Ground f = 20 Hz to 20 kHz
400 µV
SVRR Supply voltage rejection ratiofr = 100 Hz, Vr = 0.5 Vpp, CSVR = 10 µF
- 55 - dB
Tr, Tf Rise and fall times - - 35 - ns
fSW Switching frequency Internal oscillator 240 310 400 kHz
fSWR Output switching frequency rangeWith internal oscillator by changing Rosc(1) 240 - kHz
TDA7498E Electrical specifications
Doc ID 022595 Rev 1 9/20
VinH Digital input high (H)-
2.0 - -V
VinL Digital input low (L) - - 0.8
Function mode
Standby & mute & play
STBY < 0.5 V, MUTE = X StandBy
STBY > 2.5 V ; MUTE < L Mute
STBY > 2.5 V, MUTE > H Play
AMUTE Mute attenuation VMUTE < L, VSTBY = H - 75 - dB
1. fSW = 106 / ((16 * ROSC + 182) * 4) kHz, fSYNCLK = 2 * fSW with R3 = 39 kΩ (see Figure 3)
Table 6. Electrical specifications (continued)
Symbol Parameter Condition Min Typ Max Unit
Electrical specifications TDA7498E
10/20 Doc ID 022595 Rev 1
3.5 Test circuit
Figure 3. Test circuit stereo application and mono BTL mode
GA
IN S
ETT
ING
GA
INJU
MP
ER
23.6
dB
29.6
dB
33.1
dB
35.6
dB
J9 J10
J11
J12
Opt
iona
l com
pone
nts
or c
ircui
try
L+ R+
R-
VC
C
GN
D
L+ L-
R+
R-
TDA
7498
E
MU
TE
STB
Y
3V3
PO
WE
R S
UP
PLY
Sing
le-E
nded
In
put
CLA
SS
-D A
MP
LIFI
ER
For
Sin
gle-
Ende
d In
put a
nd
Load
=4 o
hm
For
LOU
TPU
T
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UT
L-M
ON
OO
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FRE
QU
EN
CY
SH
IFT
Load
=4 o
hmR
-OU
TPU
T
MO
NO
OU
T
(PS
SO
36)
MO
NO
Con
fig
MO
NO
Con
fig
MO
NO
INP
UT
L+, L
- Onl
y
MO
DE
SE
TTIN
G
STE
RE
O
MO
NO
MO
DE
JUM
PE
R
J5
J6,J
3,J8
C5
100n
F
L4C
1
1uF
C2
1uF
C11
1uF
C12
1uF
C25
100n
F
C19
100n
F
C27
330p
F
R6
22R
C40
220n
F
C41
220n
F
C21
330p
F
R5
22R
C42
220n
F
C43
220n
F
C3
1nF
C4
1nF
C13 1nF
C14 1nF
32IN
PB
36V
SS
9O
UTN
B
5P
GN
DB
7P
VC
CB
3O
UTP
B
10O
UTN
A
12P
VC
CA
14P
GN
DA
16O
UTP
A
33IN
NB
8O
UTN
B
4P
GN
DB
21M
UTE
6P
VC
CB
2O
UTP
B
29S
VR
11O
UTN
A
1S
UB
_GN
D
22IN
PA
23IN
NA
27S
GN
D
26V
DD
S
28D
IAG
19V
DD
PW
18P
GN
D
20S
TBY
24R
OS
C
31M
OD
E
35S
VC
C
30G
AIN
25S
YN
CLK
17O
UTP
A
15P
GN
DA
34V
RE
F
13P
VC
CA
IC1
TDA
7498
E
R1
47k
R7
22R
C6
100n
F
R4
120k R2
33k
R8
6.8k
C26 1uF
C10
100n
F
C20 1uF
J6
J9
21 3
S1
21 3
S2
C9
100n
FC
292.
2uF
2G
ND
1
OU
T3IN
IC2
L493
1CZ3
3
+C
152.
2uF
16V
1 2 J2
J8J7
+C
72.
2uF
16V
+C
2322
00uF
50V
L3 L1 L2
C17 10uF
10V
C16
10uF
10V
D1
18V
J4
C30
1uF
C31
1uF
R15
8RC
28
220n
F
R16 8R
C24
220n
F
R17 8R
C18
220n
F
R18 8R
C22
220n
F
SY
NC
24 13
J1
R10
100k
R11
100k R
1210
0k
J11
J12
J5J1
0
J3
R3
39K
C8
100n
F
R9
180K 1
2
3
Q1
KTC
3875
(S)
R13
47k R14
100k
D2
D3
D4 D
8D6
D5
D7
D9
+C
3222
00uF 50
V
12 J14
1 2 J13
WL+
WR
+ WL-
WR
-
L1S
L2S
L3S
L4S
R19 33k
DIA
G
VD
DS
VD
DS
VD
DS
VC
C
VC
C
VC
C
VC
C
VC
C
VD
DS
3V3
PS
PS
Characterization curves TDA7498E
11/20 Doc ID 022595 Rev 1
4 Characterization curves
Unless otherwise stated, measurements were made under the following conditions:
Vcc = 36 V, f = 1 kHz , GV = 23.6 dB, Rosc = 39 kΩ, Cosc = 100 nF, Tamb = 25 °C.
4.1 For RL = 4 Ω, stereo configuration
Figure 4. Output power vs. supply voltage
Characterization curves TDA7498E
12/20 Doc ID 022595 Rev 1
Figure 5. THD vs. output power
Figure 6. THD vs. frequency
TDA7498E Characterization curves
Doc ID 022595 Rev 1 13/20
Figure 7. FFT performance
Figure 8. Crosstalk vs. frequency
Characterization curves TDA7498E
14/20 Doc ID 022595 Rev 1
4.2 For RL = 3 Ω, mono BTL configuration
Figure 9. Output power vs. supply voltage
TDA7498E Characterization curves
Doc ID 022595 Rev 1 15/20
Figure 10. THD vs. output power
Figure 11. THD vs. frequency
Application information TDA7498E
16/20 Doc ID 022595 Rev 1
5 Application information
5.1 Stereo and mono BTL operation selection using the MODE pinThe TDA7498E can be used in stereo applications or mono BTL applications. Connecting the MODE pin to the VDDS pin configures the device in mono BTL. The output of the two channels can be paralleled. When the MODE pin is connected to ground or floating (pulled down internally) the device works as a stereo amplifier.
5.2 Gain settingThe gain of the TDA7498E is set by GAIN (pin 30).
5.3 Smart protectionTo avoid dynamic impedance drop, two overcurrent thresholds are set. The first threshold is for the overcurrent limit. The device limits the output current to the first threshold but does not shut down the PWM outputs.
If the device is shorted and at least one of the two output currents reaches the second threshold, the device is shut down immediately. The device will recover automatically when the fault is removed from the BTL outputs.
Table 7. Gain settings
GAIN0 Total Gain Application suggestion
VGAIN < 0.25*VDDS 23.6 dB GAIN pin connected to SGND
0.25*VDDS < VGAIN < 0.5*VDDS 29.6 dB Rc10 = Rc11= Rc12 = 100 K max
0.5*VDDS < VGAIN < 0.75*VDDS 33.1 dB Rc10 = Rc11 = Rc12 = 100K max
VGAIN > 0.75*VDDS 35.6 dB GAIN pin connected to VDDS
TDA7498E Package mechanical data
Doc ID 022595 Rev 1 17/20
6 Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark.
The TDA7498E comes in a 36-pin PowerSSO package with exposed pad up.
Figure 12 shows the package outline and Table 8 gives the dimensions.
Table 8. PowerSSO36 EPU dimensions
SymbolDimensions in mm Dimensions in inches
Min Typ Max Min Typ Max
A 2.15 - 2.45 0.085 - 0.096
A2 2.15 - 2.35 0.085 - 0.093
a1 0 - 0.10 0 - 0.004
b 0.18 - 0.36 0.007 - 0.014
c 0.23 - 0.32 0.009 - 0.013
D 10.10 - 10.50 0.398 - 0.413
E 7.40 - 7.60 0.291 - 0.299
e - 0.5 - - 0.020 -
e3 - 8.5 - - 0.335 -
F - 2.3 - - 0.091 -
G - - 0.10 - - 0.004
H 10.10 - 10.50 0.398 - 0.413
h - - 0.40 - - 0.016
k 0 - 8 degrees - - 8 degrees
L 0.60 - 1.00 0.024 - 0.039
M - 4.30 - - 0.169 -
N - - 10 degrees - - 10 degrees
O - 1.20 - - 0.047 -
Q - 0.80 - - 0.031 -
S - 2.90 - - 0.114 -
T - 3.65 - - 0.144 -
U - 1.00 - - 0.039 -
X 4.10 - 4.70 0.161 - 0.185
Y 4.90 - 7.10 0.193 - 0.280
TD
A7498E
Packag
e mech
anical d
ata
Doc ID
022595 Rev 1
18/20
Figure 12. PowerSSO36 EPU outline drawing
h x 45°
TDA7498E Revision history
Doc ID 022595 Rev 1 19/20
7 Revision history
Table 9. Document revision history
Date Revision Changes
12-Dec-2011 1 Initial release.
TDA7498E
20/20 Doc ID 022595 Rev 1
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