TDA7491P
2 x 10-watt dual BTL class-D audio amplifier
Features
■
10 W + 10 W continuous output power:
RL = 6 Ω, THD = 10% at VCC = 11 V
■
9.5 W + 9.5 W continuous output power:
RL = 8 Ω, THD = 10% at VCC = 12 V
■
Wide range single supply operation (5 V - 18 V)
■
High efficiency (η = 90%)
■
Four selectable, fixed gain settings of
nominally 20 dB, 26 dB, 30 dB and 32 dB
■
Differential inputs minimize common-mode
noise
■
Filterless operation
■
No ‘pop’ at turn-on/off
■
Standby and mute features
■
Short-circuit protection
■
Thermal overload protection
■
Externally synchronizable
PowerSSO-36 with
exposed pad down
Description
The TDA7491P is a dual BTL class-D audio
amplifier with single power supply designed for
LCD TVs and monitors.
Thanks to the high efficiency and
exposed-pad-down (EPD) package no separate
heatsink is required.
Furthermore, the filterless operation allows a
reduction in the external component count.
The TDA7491P is pin-to-pin compatible with the
TDA7491LP and TDA7491HV.
Table 1.
Device summary
Order code
Operating temperature
Package
Packaging
TDA7491P
-40 to 85 °C
PowerSSO-36 EPD
Tube
TDA7491P13TR
-40 to 85 °C
PowerSSO-36 EPD
Tape and reel
January 2012
Doc ID 13540 Rev 6
1/42
www.st.com
42
Contents
TDA7491P
Contents
1
Device block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3
4
5
2.1
Pin out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2
Pin list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Characterization curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1
With 4-Ω load at VCC = 10 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2
With 6-Ω load at VCC = 11 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.3
With 8-Ω load at VCC = 12 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Applications information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.1
Applications circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.2
Mode selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.3
Gain setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5.4
Input resistance and capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5.5
Internal and external clocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.6
6
2/42
5.5.1
Master mode (internal clock) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.5.2
Slave mode (external clock) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Modulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.6.1
Reconstruction low-pass filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.6.2
Filterless modulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.7
Protection functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.8
Diagnostic output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.9
Heatsink requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
5.10
Test board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Doc ID 13540 Rev 6
TDA7491P
7
Contents
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Doc ID 13540 Rev 6
3/42
List of tables
TDA7491P
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
4/42
Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Pin description list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Electrical specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Mode settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Gain settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
How to set up SYNCLK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
PowerSSO-36 EPD dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Doc ID 13540 Rev 6
TDA7491P
List of figures
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
Figure 20.
Figure 21.
Figure 22.
Figure 23.
Figure 24.
Figure 25.
Figure 26.
Figure 27.
Figure 28.
Figure 29.
Figure 30.
Figure 31.
Figure 32.
Figure 33.
Figure 34.
Figure 35.
Figure 36.
Figure 37.
Figure 38.
Figure 39.
Figure 40.
Figure 41.
Figure 42.
Figure 43.
Figure 44.
Figure 45.
Figure 46.
Figure 47.
Figure 48.
Internal block diagram (one channel only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Pin connection (top view, PCB view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Output power vs. supply voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
THD vs. output power (1 kHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
THD vs. output power (100 Hz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
THD vs. output power (15 kHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
THD vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
FFT (0 dB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
FFT (-60 dB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Power supply rejection ratio vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Power dissipation and efficiency vs. output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Attenuation vs. voltage on pin MUTE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Current consumption vs. voltage on pin STBY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Attenuation vs. voltage on pin STBY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Output power vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
THD vs. output power (1 kHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
THD vs. output power (100 Hz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
THD vs. output power (15 kHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
THD vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
FFT (0 dB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
FFT (-60 dB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Power supply rejection ratio vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Power dissipation and efficiency vs. output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Output power vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
THD vs. output power (1 kHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
THD vs. output power (100 Hz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
THD vs. output power (15 kHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
THD vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
FFT (0 dB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
FFT (-60 dB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Power supply rejection ratio vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Power dissipation and efficiency vs. output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Applications circuit for class-D amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Standby and mute circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Turn-on/off sequence for minimizing speaker “pop” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Device input circuit and frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Master and slave connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Unipolar PWM output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Typical LC filter for an 8-Ω speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Typical LC filter for a 4-Ω speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Filterless application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Behavior of pin DIAG for various protection conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Doc ID 13540 Rev 6
5/42
List of figures
Figure 49.
Figure 50.
Figure 51.
6/42
TDA7491P
Power derating curves for PCB used as heatsink . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Test board (TDA7491P) layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
PowerSSO-36 EPD outline drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Doc ID 13540 Rev 6
TDA7491P
1
Device block diagram
Device block diagram
Figure 1 shows the block diagram of one of the two identical channels of the TDA7491P.
Figure 1.
Internal block diagram (one channel only)
Doc ID 13540 Rev 6
7/42
Pin description
TDA7491P
2
Pin description
2.1
Pin out
Figure 2.
8/42
Pin connection (top view, PCB view)
SUB_GND
1
36
VSS
OUTPB
2
35
SVCC
OUTPB
3
34
VREF
PGNDB
4
33
INNB
PGNDB
5
32
INPB
PVCCB
6
31
GAIN1
PVCCB
7
30
GAIN0
OUTNB
8
29
SVR
OUTNB
9
28
DIAG
OUTNA
10
27
SGND
OUTNA
11
26
VDDS
PVCCA
12
25
SYNCLK
PVCCA
13
24
ROSC
23
INNA
22
INPA
EP
exposed pad down
Connect to ground
PGNDA
14
PGNDA
15
OUTPA
16
21
MUTE
OUTPA
17
20
STBY
PGND
18
19
VDDPW
Doc ID 13540 Rev 6
TDA7491P
2.2
Pin description
Pin list
Table 2.
Pin description list
Number
Name
Type
Description
1
SUB_GND
POWER
Connect to the frame
2,3
OUTPB
OUT
Positive PWM output for right channel
4,5
PGNDB
POWER
Power stage ground for right channel
6,7
PVCCB
POWER
Power supply for right channel
8,9
OUTNB
OUT
Negative PWM output for right channel
10,11
OUTNA
OUT
Negative PWM output for left channel
12,13
PVCCA
POWER
Power supply for left channel
14,15
PGNDA
POWER
Power stage ground for left channel
16,17
OUTPA
OUT
Positive PWM output for left channel
18
PGND
POWER
Power stage ground
19
VDDPW
OUT
3.3-V (nominal) regulator output referred to ground for power
stage
20
STBY
INPUT
Standby mode control
21
MUTE
INPUT
Mute mode control
22
INPA
INPUT
Positive differential input of left channel
23
INNA
INPUT
Negative differential input of left channel
24
ROSC
OUT
Master oscillator frequency-setting pin
25
SYNCLCK
IN/OUT
Clock in/out for external oscillator
26
VDDS
OUT
3.3-V (nominal) regulator output referred to ground for signal
blocks
27
SGND
POWER
Signal ground
28
DIAG
OUT
Open-drain diagnostic output
29
SVR
OUT
Supply voltage rejection
30
GAIN0
INPUT
Gain setting input 1
31
GAIN1
INPUT
Gain setting input 2
32
INPB
INPUT
Positive differential input of right channel
33
INNB
INPUT
Negative differential input of right channel
34
VREF
OUT
Half VDDS (nominal) referred to ground
35
SVCC
POWER
Signal power supply
36
VSS
OUT
3.3-V (nominal) regulator output referred to power supply
-
EP
-
Exposed pad for ground-plane heatsink, to be connected to
GND
Doc ID 13540 Rev 6
9/42
Electrical specifications
TDA7491P
3
Electrical specifications
3.1
Absolute maximum ratings
Table 3.
Absolute maximum ratings
Symbol
3.2
Parameter
Value
Unit
VCC
DC supply voltage
20
V
VI
Voltage limits for input pins STBY, MUTE, INNA, INPA,
INNB, INPB, GAIN0, GAIN1
-0.3 to 3.6
V
Top
Operating temperature
-40 to 85
°C
Tj
Operating junction temperature
-40 to 150
°C
Tstg
Storage temperature
-40 to 150
°C
Thermal data
Refer also to Section 5.9: Heatsink requirements on page 37.
Table 4.
10/42
Thermal data
Symbol
Parameter
Min
Typ
Max
Rth j-case
Thermal resistance, junction to case
-
2
3
Rth j-amb
Thermal resistance, junction to ambient
-
24
-
Unit
°C/W
Doc ID 13540 Rev 6
TDA7491P
3.3
Electrical specifications
Electrical specifications
Unless otherwise stated, the results in Table 5 below are given for the conditions:
VCC = 11 V, RL (load) = 6 Ω, ROSC = R3 = 39 kΩ, C8 = 100 nF, f = 1 kHz, GV = 20 dB, and
Tamb = 25 °C.
Table 5.
Electrical specifications
Symbol
Parameter
Condition
Min
Typ
Max
Unit
VCC
Supply voltage
-
5
-
18
V
Iq
Total quiescent current
Without LC filter
-
26
35
mA
IqSTBY
Quiescent current in standby
-
-
-
10
µA
Play mode
-100
-
100
mV
VOS
Output offset voltage
Mute mode
-60
-
60
mV
IOCP
Overcurrent protection threshold RL = 0 Ω
3
-
-
A
Tj
Junction temperature at thermal
shutdown
-
-
150
-
°C
Ri
Input resistance
Differential input
54
68
-
kΩ
VUVP
Undervoltage protection
threshold
-
-
-
4.5
V
High side
-
0.2
-
RdsON
Power transistor on resistance
Low side
-
0.2
-
THD = 10%
-
10
-
Po
Output power
THD = 1%
-
8.0
-
RL = 8 Ω, THD = 10%,
VCC = 12 V
-
9.5
-
RL = 8 Ω, THD = 1%,
VCC = 12 V
-
7.2
-
Po
Ω
W
Output power
W
PD
Dissipated power
Po = 10 W + 10 W,
THD = 10%
-
2.0
-
W
η
Efficiency
Po = 10 W + 10 W,
RL = 8 Ω, THD = 10%,
VCC = 12 V
-
90
-
%
THD
Total harmonic distortion
Po = 1 W
-
0.1
-
%
GAIN0 = L, GAIN1 = L
18
20
22
GAIN0 = L, GAIN1 = H
24
26
28
GAIN0 = H, GAIN1 = L
28
30
32
GAIN0 = H, GAIN1 = H
30
32
34
GV
Closed loop gain
dB
ΔGV
Gain matching
-
-1
-
1
dB
CT
Crosstalk
f = 1 kHz, Po = 1 W
-
70
-
dB
15
-
Total input noise
A Curve, GV = 20 dB
-
eN
f = 22 Hz to 22 kHz
-
20
-
Doc ID 13540 Rev 6
µV
11/42
Electrical specifications
Table 5.
Symbol
TDA7491P
Electrical specifications (continued)
Parameter
Condition
Typ
Max
Unit
SVRR
Supply voltage rejection ratio
fr = 100 Hz, Vr = 1 Vpp,
CSVR = 10 µF
-
50
-
dB
Tr, Tf
Rise and fall times
-
-
40
-
ns
fSW
Switching frequency
Internal oscillator,
master mode
290
320
350
kHz
fSWR
Switching frequency range
(1)
250
-
400
kHz
VinH
Digital input high (H)
2.3
-
-
VinL
Digital input low (L)
-
-
0.8
AMUTE
Mute attenuation
-
80
-
VMUTE = low,
VSTBY = high
Function
Standby, mute and play modes
mode
V
dB
VSTBY < 0.5 V
VMUTE = X
Standby
-
VSTBY > 2.9 V
VMUTE < 0.8 V
Mute
-
VSTBY > 2.9 V
VMUTE > 2.9 V
Play
-
1. Refer to Section 5.5: Internal and external clocks on page 32.
12/42
Min
Doc ID 13540 Rev 6
TDA7491P
4
Characterization curves
Characterization curves
The following characterization curves were made using the TDA7491P demo board. The
LC filter for the 4-Ω load uses components of 15 µH and 470 nF, whilst that for the 6-Ω load
uses 22 µH and 220 nF and that for the 8-Ω load uses 33 µH and 220 nF.
4.1
With 4-Ω load at VCC = 10 V
Figure 3.
Output power vs. supply voltage
Output Power (W)
Test Condition :
12
Vcc = 5~10V,
11
RL = 4 ohm,
10
Rosc = 39kΩ,
9
Cosc =100nF,
8
f =1kHz,
Gv = 30dB,
Tamb = 25℃
7
6
5
4
Specification Limit:
3
Typical:
2
Po = 10W @THD =10%
Po =8W @THD =1%
Figure 4.
1
0
5
6
7
8
Supply Voltage (V)
9
10
THD vs. output power (1 kHz)
THD (%)
Test Conditions:
Vcc = 10V
Rl = 4 ohm
Rosc = 39k ohm
Cosc = 100nF
f = 1kHz
Gv = 20 dB
Tamb. = 25 ˚C
Specification limits:
Typical:
Po = 12W, THD = 10%
Output Power (W)
Doc ID 13540 Rev 6
13/42
Characterization curves
Figure 5.
TDA7491P
THD vs. output power (100 Hz)
THD (%)
Test Conditions:
Vcc = 10V
Rl = 4 ohm
Rosc = 39k ohm
Cosc = 100nF
f = 100Hz
Gv = 20 dB
Tamb. = 25 ˚C
Specification limits:
Typical:
Po = 12W, THD = 10%
Output Power (W)
Figure 6.
THD vs. output power (15 kHz)
THD (%)
Test Conditions:
Vcc = 10V
Rl = 4 ohm
Rosc = 39k ohm
Cosc = 100nF
f = 15kHz
Gv = 20 dB
Tamb. = 25 ˚C
Specification limits:
Typical:
Po = 12W, THD = 2%
Output Power (W)
14/42
Doc ID 13540 Rev 6
TDA7491P
Characterization curves
Figure 7.
THD vs. frequency
THD (%)
1
Test Condition:
0.5
Vcc=10V,
RL=4 ohm,
Rosc=39kΩ, Cosc=100nF,
0.2
f = 1kHz,
0.1
Gv=30dB,
Po=1W
0.05
Tamb=25℃
0.02
Specification Limit:
0.01
Typical: THD 60dB
-130
for the harmonic frequency
-140
-150
20
50
100
200
500
1k
2k
5k
10k
20k
5k
10k
20k
Frequency (Hz)
Figure 11. FFT (-60 dB)
FFT (dB)
+0
-10
Test Condition:
-20
Vcc =10V,
-30
RL= 4 ohm,
-40
Rosc = 39kΩ, Cosc = 100nF,
-50
f = 1kHz,
-60
Gv=30dB,
-70
-80
Po= -60dB (@ 1W =0dB)
-90
Tamb=25℃
-100
-110
Specification Limit:
-120
Typical: > 90dB
-130
-140
for the harmonic frequency
-150
20
50
100
200
500
Frequency (Hz)
1k
2k
Figure 12. Power supply rejection ratio vs. frequency
+0
-10
Test Condition:
-20
Vcc =10V,
RL= 4 ohm,
-30
Ripple frequency=100Hz
-40
Ripple voltage=500mV
Rosc = 39kΩ, Cosc = 100nF,
Vin=0,
Gv=30dB,
d
B
r
0dB refers to 500mV, 100Hz,
A
-50
-60
Tamb=25℃
-70
-80
-90
-100
20
50
100
200
500
1k
Hz
4 ohm 10 v PSRR.at27
16/42
Doc ID 13540 Rev 6
2k
5k
10k
20k
TDA7491P
Characterization curves
Figure 13. Power dissipation and efficiency vs. output power
Test Condition:
90
5
Vcc =10V,
80
4. 5
70
4
RL= 4 ohm,
Ef f i ci ency ( %)
Rosc = 39kΩ, Cosc = 100nF,
f = 1kHz,
Gv=30dB,
Tamb=25℃
3. 5
60
3
50
2. 5
Vcc=10V
40
30
Rload=4ohm
2
Gain=30dB
1. 5
f=1kHz
20
Power di ssi pat i on ( W)
Power di ssi pat i on & Ef f i ci ency vs Out put power
1
10
0. 5
0
0
0
2
4
6
8
10
12
Out put power per channel ( W)
Figure 14. Attenuation vs. voltage on pin MUTE
10
Test Condition:
0
Vcc =10V,
Rosc = 39kΩ, Cosc = 100nF,
-20
Attenuation (dB)
RL= 4 ohm,
-10
0dB@f=1kHz,Po=1w,
Gv=30dB,
Tamb=25℃
Vcc=10V
-30
Rload=4ohm
-40
Gain=30dB
-50
0dB@f=1kHz, Po=1w
-60
-70
-80
-90
0
1
2
3
4
Mute voltage (V)
Figure 15. Current consumption vs. voltage on pin STBY
40
Test Condition:
35
RL= 4 ohm,
30
Rosc = 39kΩ, Cosc = 100nF,
Vin=0,
Gv=30dB,
Tamb=25℃
Iquiescent (mA)
Vcc =10V,
Vcc=10V
25
Rload=4ohm
20
Gain=30dB
Vin=0
15
10
5
0
0
0.5
1
1.5
2
2.5
3
3.5
Standby voltage (V)
Doc ID 13540 Rev 6
17/42
Characterization curves
TDA7491P
Figure 16. Attenuation vs. voltage on pin STBY
Test Condition:
Vcc =10V,
0
RL= 4 ohm,
-20
Rosc = 39kΩ, Cosc = 100nF,
Vcc=10V
Attenuation (dB)
0dB@f=1kHz,Po=1w,
Gv=30dB,
Tamb=25℃
-40
Rload=4ohm
Gain=30dB
-60
0dB@f=1kHz, Po=1w
-80
-100
-120
0
0.5
1
1.5
2
2.5
3
3.5
Standby voltage (V)
4.2
With 6-Ω load at VCC = 11 V
Figure 17. Output power vs. supply voltage
Test Condition :
Vcc = 5~11V,
RL = 6 ohm,
f =1kHz,
Gv = 30dB,
Tamb = 25℃
Specification Limit:
Typical:
Vs =11V,Rl =6 ohm
Po =10W @THD=10%
Po =8W @THD=1%
18/42
Output Power (W)
Rosc = 39kO, Cosc = 100nF,
12
11
10
9
8
7
6
5
4
3
2
1
0
THD =10%
Rl =6 ohm
f =1kHz
5
6
Doc ID 13540 Rev 6
THD =1%
7
8
9
Supply Voltage (V)
10
11
TDA7491P
Characterization curves
Figure 18. THD vs. output power (1 kHz)
THD (%)
Test Conditions:
Vcc = 11V
Rl = 6 ohm
Rosc = 39k ohm
Cosc = 100nF
f = 1kHz
Gv = 20 dB
Tamb. = 25 ˚C
Specification limits:
Typical:
Po = 10W, THD = 10%
Output Power (W)
Figure 19. THD vs. output power (100 Hz)
THD (%)
Test Conditions:
Vcc = 11V
Rl = 6 ohm
Rosc = 39k ohm
Cosc = 100nF
f = 100Hz
Gv = 20 dB
Tamb. = 25 ˚C
Specification limits:
Typical:
Po = 10W, THD = 10%
Output Power (W)
Doc ID 13540 Rev 6
19/42
Characterization curves
TDA7491P
Figure 20. THD vs. output power (15 kHz)
THD (%)
Test Conditions:
Vcc = 11V
Rl = 6 ohm
Rosc = 39k ohm
Cosc = 100nF
f = 15kHz
Gv = 20 dB
Tamb. = 25 ˚C
Specification limits:
Typical:
Po = 10W, THD = 1%
Output Power (W)
Figure 21. THD vs. frequency
THD(%)
Test Conditions:
Vcc = 11V
Rl = 6 ohm
Rosc = 39k ohm
Cosc = 100nF
Po = 1W
Gv = 20 dB
Tamb. = 25 ˚C
Specification limits:
Typical:
THD 90dB
-130
for the harmonic frequency
-140
-150
20
50
100
200
500
1k
2k
5k
10k
20k
Frequency (Hz)
Figure 37. Power supply rejection ratio vs. frequency
+0
-10
Test Condition:
-20
Vcc =12V,
RL= 8 ohm,
-30
Rosc =39kΩ, Cosc =100nF,
f =1kHz,
Ripple frequency=100Hz
Ripple voltage=500mV
-40
Gv =30dB,
d
B
r
0dB refers to 500mV, 100Hz,
A
-50
-60
Tamb =25℃
-70
-80
-90
-100
20
50
100
200
500
1k
2k
5k
10k
20k
Hz
8ohm 12v PSRR.at27
Figure 38. Power dissipation and efficiency vs. output power
Test Condition:
100
Vcc =12V,
80
Gv =30dB,
Tamb =25℃
Efficiency (%)
Rosc =39kΩ, Cosc =100nF,
2
70
60
1.5
50
Vcc=12V
40
1
Rload=8ohm
30
Gain=30dB
20
f=1kHz
0.5
10
0
0
0
28/42
2
4
6
Output power per channel (W)
Doc ID 13540 Rev 6
8
10
Dissipation Power (W)
RL= 8 ohm,
f =1kHz,
2.5
90
TDA7491P
Applications information
5
Applications information
5.1
Applications circuit
Figure 39. Applications circuit for class-D amplifier
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