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Número de pieza TDA7491P
Descripción 2 x 10-watt dual BTL class-D audio amplifier
Fabricantes STMicroelectronics 
Logotipo STMicroelectronics Logotipo



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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
TDA7491P
-40 to 85 °C
PowerSSO-36 EPD
TDA7491P13TR
-40 to 85 °C
PowerSSO-36 EPD
Packaging
Tube
Tape and reel
January 2012
Doc ID 13540 Rev 6
1/42
www.st.com
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1 page




TDA7491P pdf
TDA7491P
List of figures
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
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Figure 7.
Figure 8.
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Figure 10.
Figure 11.
Figure 12.
Figure 13.
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Figure 28.
Figure 29.
Figure 30.
Figure 31.
Figure 32.
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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
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5 Page





TDA7491P arduino
TDA7491P
Electrical specifications
3.3
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.
Symbol
Electrical specifications
Parameter
Condition
Min Typ Max Unit
VCC
Iq
IqSTBY
VOS
IOCP
Tj
Ri
VUVP
RdsON
Po
Po
PD
η
THD
GV
ΔGV
CT
eN
Supply voltage
-
5-
18 V
Total quiescent current
Without LC filter
- 26 35 mA
Quiescent current in standby -
- - 10 µA
Output offset voltage
Play mode
Mute mode
-100 -
-60 -
100 mV
60 mV
Overcurrent protection threshold RL = 0 Ω
Junction temperature at thermal
shutdown
-
3-
-
- 150 -
A
°C
Input resistance
Differential input
54 68 -
kΩ
Undervoltage protection
threshold
-
- - 4.5 V
Power transistor on resistance
High side
Low side
- 0.2 -
Ω
- 0.2 -
Output power
THD = 10%
THD = 1%
- 10 -
W
- 8.0 -
Output power
Dissipated power
RL = 8 Ω, THD = 10%,
VCC = 12 V
RL = 8 Ω, THD = 1%,
VCC = 12 V
Po = 10 W + 10 W,
THD = 10%
-
-
-
9.5 -
7.2 -
2.0 -
W
W
Efficiency
Total harmonic distortion
Po = 10 W + 10 W,
RL = 8 Ω, THD = 10%,
VCC = 12 V
-
90 -
%
Po = 1 W
- 0.1 - %
GAIN0 = L, GAIN1 = L 18 20 22
Closed loop gain
GAIN0 = L, GAIN1 = H 24 26 28
dB
GAIN0 = H, GAIN1 = L 28 30 32
GAIN0 = H, GAIN1 = H 30 32 34
Gain matching
-
-1 -
1 dB
Crosstalk
Total input noise
f = 1 kHz, Po = 1 W
- 70 - dB
A Curve, GV = 20 dB - 15 -
µV
f = 22 Hz to 22 kHz
- 20 -
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