2003 Mar 20
26
Philips Semiconductors
Objective specification
2
×
25 W class-D power amplifier
TDA8922
handbook, halfpage
Iq
(mA)
0
5
10
25
15
30
35
VDD (V)
20
0
100
60
80
20
40
MGX338
Fig.26 Quiescent current as a function of supply
voltage.
R
L
=
∞
.
handbook, halfpage
fclk
(kHz)
0
5
10
25
15
30
35
VDD (V)
20
290
320
300
310
MGX339
Fig.27 Clock frequency as a function of supply
voltage.
R
L
=
∞
.
handbook, halfpage
MGX346
SVRR
(dB)
−
80
−
100
−
60
−
20
−
40
0
fi (Hz)
10
10
2
10
3
10
4
10
5
(2)
(1)
(3)
Fig.28 SVRR as a function of input frequency.
V
P
=
±
20 V; V
ripple
= 2 V (p-p) with respect to ground.
(1) Both supply lines in phase.
(2) Both supply lines in anti-phase.
(3) One supply line rippled.
handbook, halfpage
SVRR)
(dB)
0
3
1
4
5
Vripple(p-p) (V)
2
−
100
0
−
40
−
20
−
80
−
60
MGX347
(1)
(2)
(3)
Fig.29 SVRR as a function of V
ripple(p-p)
.
V
P
=
±
20 V; V
ripple
with respect to ground (in phase).
(1) f
ripple
= 1 kHz.
(2) f
ripple
= 100 Hz.
(3) f
ripple
= 10 Hz.
