TDA7492
50 W + 50 W dual BTL class-D amplifier
Datasheet - production data
Description
The TDA7492 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-up
(EPU) package, only a simple heatsink is
required.
PowerSSO-36
with exposed pad up
Features
50 W + 50 W continuous output power at
THD = 10% with RL = 6 and VCC = 25 V
40 W + 40 W continuous output power at
THD = 10% with RL = 8 and VCC = 25 V
Wide-range single-supply operation (8 - 26 V)
High efficiency ( = 90%)
Four selectable, fixed gain settings of
nominally 21.6 dB, 27.6 dB, 31.1 dB and
33.6 dB
Differential inputs minimize common-mode
noise
Standby and mute features
Short-circuit protection
Thermal overload protection
Externally synchronizable
ECOPACK®, environmentally friendly package
Table 1. Device summary
Order code
Operating temp. range
Package
Packaging
TDA7492
-40 to +85 °C
PowerSSO-36 EPU
Tube
TDA749213TR
-40 to +85 °C
PowerSSO-36 EPU
Tape and reel
January 2015
This is information on a product in full production.
DocID014926 Rev 6
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www.st.com
Contents
TDA7492
Contents
1
Device block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3
4
2.1
Pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2
Pin list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.3
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Characterization curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1
Characterizations for 6- loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.2
Characterizations for 8- loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.3
Characterizations for 4- loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.4
Test board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5
Applications circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6
Applications information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7
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6.1
Mode selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.2
Gain setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.3
Input resistance and capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.4
Internal and external clocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.4.1
Master mode (internal clock) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.4.2
Slave mode (external clock) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.5
Output low-pass filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.6
Protection functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.7
Diagnostic output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.8
Heatsink requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
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TDA7492
8
Contents
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
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32
List of tables
TDA7492
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
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Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Pin description list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electrical specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Mode settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Gain settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
How to set up SYNCLK. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
PowerSSO-36 EPU dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Document revision history. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
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TDA7492
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.
Internal block diagram (showing one channel only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Pin connections (top view, PCB view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Output power vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
THD vs. output power (1 kHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
THD vs. output power (100 Hz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
THD vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Crosstalk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
FFT performance (0 dB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
FFT performance (-60 dB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Output power vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
THD vs. output power (1 kHz). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
THD vs. output (100 Hz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
THD vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Crosstalk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
FFT performance (0 dB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
FFT performance (-60 dB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Output power vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
THD vs. output power (1 kHz). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
THD vs. output (100 Hz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
THD vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Crosstalk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
FFT performance (0 dB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
FFT performance (-60 dB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Test board layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Applications circuit for class-D amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Standby and mute circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Turn on/off sequence for minimizing speaker “pop” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Device input circuit and frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Master and slave connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Typical LC filter for a 8- speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Typical LC filter for a 4- speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Behavior of pin DIAG for various protection conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
PowerSSO-36 EPU outline drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
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Device block diagram
1
TDA7492
Device block diagram
Figure 1 shows the block diagram of one of the two identical channels of the TDA7492.
Figure 1. Internal block diagram (showing one channel only)
6/32
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TDA7492
Pin description
2
Pin description
2.1
Pinout
Figure 2. Pin connections (top view, PCB view)
SUB GND
1
SVCC
OUTPB
2
34 VREF
OUTPB
3
33 INNB
PGNDB
4
32 INPB
PGNDB
5
31 GAIN1
PVCCB
6
30 GAIN0
PVCCB
7
29 SVR
OUTNB
8
28 DIAG
OUTNB
9
27 SGND
OUTNA 10
26 VDDS
OUTNA 11
25 SYNCLK
PVCCA 12
24 ROSC
PVCCA 13
23 INNA
PGNDA 14
36 VSS
35
22 INPA
EP
exposed pad up
Connect to ground
21 MUTE
PGNDA 15
OUTPA 16
OUTPA 17
20 STBY
19 VDDPW
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Pin description
2.2
TDA7492
Pin list
Table 2. Pin description list
Number
8/32
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
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
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
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
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 GND
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TDA7492
Electrical specifications
3
Electrical specifications
3.1
Absolute maximum ratings
Table 3. Absolute maximum ratings
Symbol
3.2
Parameter
Value
Unit
VCC
DC supply voltage for pins PVCCA, PVCCB, SVCC
30
V
VI
Voltage limits for input pins STBY, MUTE, INNA, INPA,
INNB, INPB, GAIN0, GAIN1
-0.3 - 3.6
V
Top
Operating temperature
-40 to +85
°C
Tj
Junction temperature
-40 to 150
°C
Tstg
Storage temperature
-40 to 150
°C
Thermal data
Table 4. Thermal data
3.3
Symbol
Parameter
Rth j-case
Thermal resistance, junction to case
Min
-
Typ
2
Max
3
Unit
°C/W
Electrical specifications
Unless otherwise stated, the results in Table 5 below are given for the conditions:
VCC = 25 V, RL (load) = 8 , ROSC = R3 = 39 k, C8 = 100 nF, f = 1 kHz, GV = 21.6 dB and
Tamb = 25 °C.
Table 5. Electrical specifications
Symbol
Parameter
Condition
Min
Typ
Max
Unit
VCC
Supply voltage for
pins PVCCA, PVCCB, SVCC
-
8
-
26
V
Iq
Total quiescent current
Without LC
-
26
35
mA
IqSTBY
Quiescent current in standby
-
-
2.5
5.0
μA
VOS
Output offset voltage
Play mode
-
-
±100
Mute mode
-
-
±60
IOCP
Overcurrent protection threshold RL = 0
4.8
6.0
-
A
Tj
Junction temperature at thermal
shutdown
-
-
150
-
°C
Ri
Input resistance
Differential input
48
60
-
k
VOVP
Overvoltage protection threshold -
28
29
-
V
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Electrical specifications
TDA7492
Table 5. Electrical specifications (continued)
Symbol
Parameter
VUVP
Undervoltage protection
threshold
RdsON
Power transistor on resistance
Po
Output power
Po
Output power
Condition
Min
Typ
-
-
-
7
High side
-
0.2
-
Low side
-
0.2
-
THD = 10%
-
40
-
THD = 1%
-
32
-
RL = 6 , THD = 10%,
VCC = 25V
-
50
-
RL = 6 , THD = 1%
VCC = 25V
-
40
-
Unit
V
W
W
PD
Dissipated power
Po =40W +40 W,
THD = 10%
-
8.0
-
W
Efficiency
Po = 40 W + 40W
80
90
-
%
THD
Total harmonic distortion
Po = 1 W
-
0.1
0.4
%
GAIN0 = L, GAIN1 = L
20.6
21.6
22.6
GAIN0 = L, GAIN1 = H
26.6
27.6
28.6
GAIN0 = H, GAIN1 = L
30.1
31.1
32.1
GAIN0 = H, GAIN1 = H
32.6
33.6
34.6
GV
Closed-loop gain
dB
GV
Gain matching
-
-
-
±1
dB
CT
Cross talk
f = 1 kHz
-
50
-
dB
eN
Total input noise
A Curve, GV = 20 dB
-
20
-
f = 22 Hz to 22 kHz
-
25
35
SVRR
Supply voltage rejection ratio
fr = 100 Hz, Vr = 0.5 V,
CSVR = 10 μF
40
50
-
dB
Tr, Tf
Rise and fall times
-
-
50
-
ns
fSW
Switching frequency
Internal oscillator
290
310
330
kHz
250
-
400
With external oscillator (2) 250
-
400
2.3
-
-
-
-
0.8
60
80
-
fSWR
Output switching frequency
Range
VinH
Digital input high (H)
VinL
Digital input low (L)
AMUTE
Mute attenuation
With internal oscillator
VMUTE = 1 V
(1)
1. fSW = 106 / ((16 * ROSC + 182) * 4) kHz, fSYNCLK = 2 * fSW with R3 = 39 k (see Figure 28.).
2. fSW = fSYNCLK / 2 with the frequency of the external oscillator.
10/32
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kHz
V
dB
TDA7492
4
Characterization curves
Characterization curves
The general test conditions used for producing the characterization curves can be
summarized as follows:
Test board: SZ LAB TDA7492 slug-up demo board
Test frequency: 1 kHz (also 100 Hz for THD vs. output power only)
Output power: 1 W
For 6-loads
–
test voltage: 25 V
–
LC filter: L = 22 μH and C = 220 nF
For 8-loads
–
test voltage: 25 V
–
LC filter: L = 33 μH and C = 220 nF
For 4-loads
–
test voltage: 20 V
–
LC filter: L = 15 μH and C = 470 nF.
Figure 28 on page 22 shows the circuit with which the characterization curves, shown in the
next sections, were measured. Figure 27 on page 21 shows the PCB layout.
Characterizations for 6- loads
Figure 3. Output power vs. supply voltage
3RXWYV9FF
Test conditions:
Vcc = 15 - 25 V,
RL = 6 Ω,
Rosc = 39 kΩ, Cosc = 100 nF,
f = 1 kHz,
Gv = 30 dB,
Tamb = 25r C
3RXW :
4.1
10% THD
1% THD
Specification limit:
Typical:
Vs = 25 V, RL = 6 Ω,
Po = 50 W atTHD = 10%,
9FF 9
Po = 40 W atTHD = 1%
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32
Characterization curves
TDA7492
Figure 4. THD vs. output power (1 kHz)
10
5
Test conditions:
THD %
Vcc = 25 V,
2
RL = 6 Ω,
Rosc = 39 kΩ, Cosc = 100 nF,
f = 1 kHz,
1
0.5
Gv = 30 dB,
0.2
Tamb = 25r C
0.1
0.05
Specification limit:
Typical:
0.02
Po = 50 W at THD = 10%
0.01
100m
200m
500m
1
2
5
10
20
60
Output Power (W)
Figure 5. THD vs. output power (100 Hz)
10
Test conditions:
Vcc = 25 V,
RL = 6 Ω,
Rosc = 39 kΩ, Cosc = 100 nF,
f = 100 Hz,
5
THD %
2
1
0.5
Gv = 30 dB,
0.2
Tamb = 25r C
0.1
Specification limit:
Typical:
0.05
0.02
Po = 50 W at THD = 10%
0.01
100m
200m
500m
1
2
5
10
Output power (W)
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60
TDA7492
Characterization curves
Figure 6. THD vs. frequency
0.5
0.4
Test conditions:
0.3
Vcc = 25 V,
RL = 6 Ω,
Rosc = 39 kΩ, Cosc = 100 nF,
0.2
THD %
f = 1 kHz,
0.1
Gv = 30 dB,
0.07
0.06
Po = 1 W,
0.05
0.04
Tamb = 25r C
0.03
0.02
Specification limit:
Typical: THD < 0.4%
0.01
20
50
100
200
500
1k
2k
5k
10k
20k
Frequency (Hz)
Figure 7. Frequency response
+1
Test conditions:
Vcc = 25 V,
RL = 6 Ω,
+0.5
-0
dBrA
-0.5
-1
Rosc = 39 kΩ, Cosc = 100 nF,
-1.5
f = 1 kHz,
-2
Gv = 30 dB,
-2.5
Po = 1 W,
-3
Tamb = 25r C
-3.5
-4
Specification limit:
-4.5
-5
Max: +/-3 dB (20 Hz to 20 kHz)
-5.5
-6
20
50
100
200
500
1k
2k
5k
10k
20k
Frequency (Hz)
Figure 8. Crosstalk
-60 T
Test conditions:
Vcc = 25 V,
RL = 6 Ω,
Crosstalk
dB
T TT
-75
-80
f = 1 kHz,
-85
Gv = 30 dB,
-90
Tamb = 25r C
T
-70
Rosc = 39 kΩ, Cosc = 100 nF,
Po = 1 W
T
-65
-95
-100
-105
Specification limit:
-110
Typical: > 50 dB (at f = 1 kHz)
-115
-120
20
50
100
200
500
1k
2k
5k
10k
20k
Frequency (Hz)
DocID014926 Rev 6
13/32
32
Characterization curves
TDA7492
Figure 9. FFT performance (0 dB)
+10
+0
Test conditions:
-10
Vcc = 25 V,
-20
dBrA
RL = 6 Ω,
-30
-40
Rosc = 39 kΩ, Cosc = 100 nF,
-50
f = 1 kHz,
-60
Gv = 30 dB,
-70
Po = 1 W,
-80
-90
Tamb = 25r C
-100
-110
Specification limit:
-120
Typical: > 60 dB
-130
for the harmonic frequency
-140
-150
20
50
100
200
500
1k
2k
5k
10k
20k
2k
5k
10k
20k
Frequency (Hz)
Figure 10. FFT performance (-60 dB)
+10
+0
Test conditions:
-10
Vcc = 25 V,
RL = 6 Ω,
Rosc = 39 kΩ, Cosc = 100 nF,
-20
dBrA
-30
-40
-50
f = 1 kHz,
Gv = 30 dB,
Po = -60 dB (at 1 W = 0 dB)
Tamb = 25r C
-60
-70
-80
-90
-100
-110
Specification limit:
-120
Typical: > 90 dB
-130
for the harmonic frequency
-140
-150
20
50
100
200
500
1k
Frequency (Hz)
14/32
DocID014926 Rev 6
TDA7492
Characterizations for 8- loads
Figure 11. Output power vs. supply voltage
Test conditions:
3RXWYV9FF
Vcc = 5 - 25 V,
RL = 8 Ω,
Rosc = 39 kΩ, Cosc = 100 nF,
f = 1 kHz,
3RXW :
4.2
Characterization curves
Gv = 30 dB,
Tamb = 25r C
10% THD
1% THD
Specification limit:
Typical:
Vs = 25 V, RL = 8 Ω,
Po = 40 W at THD = 10%,
9FF 9
Po = 32 W at THD = 1%
Figure 12. THD vs. output power (1 kHz)
10
Test conditions:
5
Vcc = 25 V,
THD
RL = 8 Ω,
%
Rosc = 39 kΩ, Cosc = 100 nF,
f = 1 kHz,
2
1
0.5
Gv = 30 dB,
Tamb = 25r C
0.2
0.1
Specification limit:
0.05
Typical:
0.02
Po = 40 W at THD = 10%
0.01
100m
200m
500m
1
2
5
10
20
50
Output power (W)
DocID014926 Rev 6
15/32
32
Characterization curves
TDA7492
Figure 13. THD vs. output (100 Hz)
10
Test conditions:
Vcc = 25 V,
RL = 8 Ω,
5
THD
%
2
Rosc = 39 kΩ, Cosc = 100 nF,
1
f = 100 Hz,
0.5
Gv = 30 dB,
Tamb = 25r C
0.2
0.1
Specification limit:
0.05
Typical:
Po = 40 W at THD = 10%
0.02
0.01
100m
200m
500m
1
2
5
10
20
50
Output power (W)
Figure 14. THD vs. frequency
0.5
0.4
Test conditions:
0.3
Vcc = 25 V,
THD
RL = 8 Ω,
%
0.2
Rosc = 39 kΩ, Cosc = 100 nF,
0.1
f = 1 kHz,
Gv = 30 dB,
0.07
0.06
Po = 1 W,
0.05
Tamb = 25r C
0.04
0.03
Specification limit:
0.02
Typical: THD < 0.4%
0.01
20
50
100
200
500
1k
2k
5k
10k
Frequency (Hz)
Figure 15. Frequency response
+1
+0.5
Test conditions:
Vcc = 25 V,
RL = 8 Ω,
Rosc = 39 kΩ, Cosc = 100 nF,
f = 1 kHz,
Gv = 30 dB,
Po = 1 W,
-0
dBrA
-0.5
-1
-1.5
-2
-2.5
-3
Tamb = 25r C
-3.5
Specification limit:
-4.5
-4
Max: +/-3 dB (20 Hz to 20 kHz)
-5
-5.5
-6
20
50
100
200
500
1k
Frequency (Hz)
16/32
DocID014926 Rev 6
2k
5k
10k
20k
20k
TDA7492
Characterization curves
Figure 16. Crosstalk
-60
Test conditions:
Vcc = 25 V,
RL = 8 Ω,
T
T
T T TT T
T
-65
Crosstalk
-70
dB
-75
Rosc = 39 kΩ, Cosc = 100 nF,
-80
f = 1 kHz,
-85
Gv = 30 dB,
-90
Po = 1 W,
-95
Tamb = 25r C
-100
-105
Specification limit:
-110
Typical: > 50 dB (at f = 1 kHz)
-115
-120
20
50
100
200
500
1k
2k
5k
10k
20k
Frequency (Hz)
Figure 17. FFT performance (0 dB)
+10
+0
Test conditions:
Vcc = 25 V,
-10
dBrA
RL = 8 Ω,
-20
-30
Rosc = 39 kΩ, Cosc = 100 nF,
-40
f = 1 kHz,
-50
Gv = 30 dB,
-60
-70
Po = 1 W,
-80
Tamb = 25r C
-90
-100
-110
Specification limit:
-120
Typical: > 60 dB
-130
for the harmonic frequency
-140
-150
20
50
100
200
500
1k
2k
5k
10k
20k
Frequency (Hz)
Figure 18. FFT performance (-60 dB)
+10
+0
Test conditions:
-10
Vcc = 25 V,
dBrA
-20
RL = 8 Ω,
-30
Rosc = 39 kΩ, Cosc = 100 nF,
-40
f = 1 kHz,
-50
Gv = 30 dB,
-60
-70
Po = -60 dB (at 1 W = 0 dB)
Tamb = 25r C
-80
-90
-100
-110
Specification limit:
-120
Typical: > 90 dB
-130
for the harmonic frequency
-140
-150
20
50
100
200
500
1k
2k
5k
10k
20k
Frequency (Hz)
DocID014926 Rev 6
17/32
32
Characterization curves
4.3
TDA7492
Characterizations for 4- loads
Figure 19. Output power vs. supply voltage
Test conditions:
3RXWYV9FF
Vcc = 15 - 22 V,
RL = 4 Ω,
Rosc = 39 kΩ, Cosc = 100 nF,
3RXW :
f = 1 kHz,
Gv = 20 dB,
Tamb = 25r C
Specification limit:
Typical:
10% THD
1% THD
Vs = 20 V, RL = 4 Ω,
Po = 47 W at THD = 10%,
9FF 9
Po = 38 W at THD = 1%
Figure 20. THD vs. output power (1 kHz)
10
Test conditions:
5
Vcc = 20 V,
THD + N
RL = 4 Ω,
%
Rosc = 39 kΩ, Cosc = 100 nF,
f = 1 kHz,
2
1
0.5
Gv = 20 dB,
Tamb = 25r C
0.2
0.1
Specification limit:
0.05
Typical:
Po = 38 W at THD = 1%
0.02
0.01
100m
200m
500m
1
2
5
Output power (W)
18/32
DocID014926 Rev 6
10
20
50
TDA7492
Characterization curves
Figure 21. THD vs. output (100 Hz)
10
Test conditions:
5
Vcc = 20 V,
THD + N
RL = 4 Ω,
%
2
Rosc = 39 kΩ, Cosc = 100 nF,
1
f = 100 Hz,
0.5
Gv = 20 dB,
Tamb = 25r C
0.2
0.1
Specification limit:
0.05
Typical:
Po = 38 W at THD = 1%
0.02
0.01
100m
200m
500m
1
2
5
10
20
50
Output power (W)
Figure 22. THD vs. frequency
0.5
0.4
Test conditions:
0.3
Vcc = 20 V,
RL = 4 Ω,
THD + N
0.2
%
Rosc = 39 kΩ, Cosc = 100 nF,
f = 1 kHz,
0.1
Gv = 20 dB,
0 dB at f = 1 kHz,
0.07
0.06
Po = 1 W,
0.05
Tamb = 25r C
0.04
0.03
Specification limit:
0.02
Typical: THD < 0.4%
0.01
20
50
100
200
500
1k
2k
5k
10k
20k
Frequency (Hz)
Figure 23. Frequency response
+1
Test conditions:
+0.75
+0.5
Vcc = 20 V,
RL = 4 Ω,
Rosc = 39 kΩ, Cosc = 100 nF,
f = 1 kHz,
Gv = 20 dB,
0 dB at f = 1 kHz,
Po = 1 W,
Tamb = 25r C
+0.25
dBrA
-0
-0.25
-0.5
-0.75
-1
-1.25
-1.5
-1.75
-2
Specification limit:
Typical:
Max: +/-3 dB (20 Hz to 20 kHz)
-2.25
-2.5
-2.75
-3
20
50
100
200
500
1k
2k
5k
10k
20k
Frequency (Hz)
DocID014926 Rev 6
19/32
32
Characterization curves
TDA7492
Figure 24. Crosstalk
-60
T
Vcc = 20 V,
RL = 4 Ω,
T T
T
T
-65
Test conditions:
-70
Crosstalk
-75
dB
Rosc = 39 kΩ, Cosc = 100 nF,
-80
f = 1 kHz,
-85
Gv = 20 dB,
-90
0 dB at f = 1 kHz,
-95
Po = 1 W,
-100
Tamb = 25r C
-105
Specification limit:
-110
Typical: > 50 dB (at f = 1 kHz)
-115
-120
20
50
100
200
500
1k
2k
5k
10k
20k
2k
5k
10k
20k
Frequency (Hz)
Figure 25. FFT performance (0 dB)
+10
+0
Test conditions:
Vcc = 20 V,
-10
dBrA
RL = 4 Ω,
-20
-30
Rosc = 39 kΩ, Cosc = 100 nF,
-40
f = 1 kHz,
-50
Gv = 20 dB,
-60
0 dB at f = 1 kHz,
-70
-80
Po = 1 W,
-90
Tamb = 25r C
-100
-110
Specification limit:
-120
Typical: > 60 dB
-130
for the harmonic frequency
-140
-150
20
50
100
200
500
1k
Frequency (Hz)
Figure 26. FFT performance (-60 dB)
+10
+0
Test conditions:
-10
Vcc = 20 V,
RL = 4 Ω,
-20
dBrA
-30
Rosc = 39 kΩ, Cosc = 100 nF,
-40
f = 1 kHz,
-50
Gv = 20 dB,
-60
0 dB at f = 1 kHz,
-70
-80
Po = 1 W,
Tamb = 25r C
-90
-100
-110
Specification limit:
-120
Typical: > 90 dB
-130
for the harmonic frequency
-140
-150
20
50
100
200
500
1k
Frequency (Hz)
20/32
DocID014926 Rev 6
2k
5k
10k
20k
TDA7492
Test board
Figure 27. Test board layout
2. Test board
4.4
Characterization curves
DocID014926 Rev 6
21/32
32
Applications circuit
5
TDA7492
Applications circuit
Figure 28. Applications circuit for class-D amplifier
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4RKP
15 μH
X+
470
Q)nF
6RKP
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Q)nF
220
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33 μH
Q)
220
nF
RKP
68 μH
X+
220 nF
16
Input settings for standby, mute and play:
Input settings for gain:
STBY : MUTE
Mode
GAIN0 : GAIN1
Nominal gain
Standby
Standby
Mute
Play
0V:0V
0 V : 3.3 V
3.3 V : 0 V
3.3 V : 3.3 V
21.6 dB
27.6 dB
31.1 dB
33.6 dB
0V:0V
0 V : 3.3 V
3.3 V : 0 V
3.3 V : 3.3 V
22/32
695
7'$ 3 6OXJGRZQ
Class-D amplifier
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工商网监
湘ICP备2023018690号
