5 curves measured in reference design, Fig.9 thd + n as function of output power, Fig.10 thd + n as function of frequency – Philips TDA8928J User Manual
Page 17: Fig.11 efficiency as function of output power, Fig.12 svrr as function of frequency
2004 May 05
17
Philips Semiconductors
Preliminary specification
Power stage 2 x 10 or 1 x 20 W class-D
audio amplifier
TDA8928J
15.5
Curves measured in reference design
handbook, halfpage
MGX383
10
−
2
10
−
1
1
10
10
2
THD
+
N
(%)
10
2
10
1
10
−
1
10
−
2
10
−
3
Po (W)
(2)
(1)
(3)
Fig.9 THD + N as function of output power.
2
×
8
Ω
SE; V
P
=
±
12.5 V.
(1) 6 kHz.
(2) 1 kHz.
(3) 100 Hz.
handbook, halfpage
MGX384
10
10
2
10
3
10
4
10
5
10
2
10
1
10
−
1
10
−
3
10
−
2
fi (Hz)
THD
+
N
(%)
(1)
(2)
Fig.10 THD + N as function of frequency.
2
×
8
Ω
SE; V
P
=
±
12.5 V.
(1) P
o
= 10 W.
(2) P
o
= 1 W.
handbook, halfpage
0
10
100
0
20
40
60
80
2
4
6
8
η
(%)
Po (W)
MGX385
Fig.11 Efficiency as function of output power.
2
×
8
Ω
SE; V
P
=
±
12.5 V; f
i
= 1 kHz.
handbook, halfpage
(4)
MGX386
SVRR
(dB)
−
60
−
50
−
30
−
40
−
20
−
10
0
fi (Hz)
10
10
2
10
3
10
4
10
5
(2)
(1)
(3)
Fig.12 SVRR as function of frequency.
V
P
=
±
12.5 V; V
ripple(p-p)
= 2 V.
(1) Both supply lines in phase.
(2) One supply line (V
SS
) rippled.
(3) One supply line (V
DD
) rippled.
(4) Both supply lines in antiphase.