TDA7491P Datasheet, PDF (28/42 Pages) STMicroelectronics – 2 x 10-watt dual BTL class-D audio amplifier

Characterization curves
TDA7491P
Figure 36. FFT (-60 dB)
Test Condition:
Vcc =12V,
RL= 8 ohm,
Rosc =39kΩ, Cosc =100nF,
f =1kHz,
Gv =30dB,
Po = -60dB (@ 1W =0dB)
Tamb =25℃
Specification Limit:
Typical: > 90dB
for the harmonic frequency
FFT (dB)
+0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
20
50
100
200
500
1k
2k
Frequency (Hz)
5k
10k 20k
Figure 37. Power supply rejection ratio vs. frequency
+0
Test Condition:
Vcc =12V,
RL= 8 ohm,
Rosc =39kΩ, Cosc =100nF,
f =1kHz,
Gv =30dB,
0dB refers to 500mV, 100Hz,
Tamb =25℃
-10
-20
-30
-40
d
B
r
-50
A
-60
-70
Ripple frequency=100Hz
Ripple voltage=500mV
-80
-90
-100
20
50
100
200
500
1k
2k
Hz
8ohm 12v PSRR.at27
Figure 38. Power dissipation and efficiency vs. output power
5k
10k 20k
Test Condition:
Vcc =12V,
RL= 8 ohm,
Rosc =39kΩ, Cosc =100nF,
f =1kHz,
Gv =30dB,
Tamb =25℃
100
90
80
70
60
50
40
30
20
10
0
0
Vcc=12V
Rload=8ohm
Gain=30dB
f=1kHz
2
4
6
8
Output power per channel (W)
2.5
2
1.5
1
0.5
0
10
28/42
Doc ID 13540 Rev 6