TDA8922B NXP Semiconductors, TDA8922B Datasheet - Page 15

• Manufacturer Part Number: TDA8922B
• Description: The TDA8922B is a high efficiency class-D audio power amplifier with very lowdissipation
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Table 10:
V
[1]
[2]
[3]
[4]
[5]
[6]
[7]
13. Application information
9397 750 13357
Preliminary data sheet
Symbol
V
V
CMRR
P
n(o)
o(mute)
= 26 V; R
R
Output power is measured indirectly; based on R
Total harmonic distortion is measured in a bandwidth of 22 Hz to 20 kHz, using an AES17 20 kHz brickwall filter. Maximum limit is
guaranteed but may not be 100 % tested.
V
B = 22 Hz to 20 kHz, using an AES17 20 kHz brickwall filter.
B = 22 Hz to 20 kHz, using an AES17 20 kHz brickwall filter; independent of R
V
ripple
i
sL
= V
is the series resistance of inductor of low-pass LC filter in the application.
i(max)
= V
Mono BTL application characteristics
Parameter
noise output voltage
output signal in mute
common mode rejection
ratio
ripple(max)
L
= 1 V (RMS); f
= 8 ; f
13.1 BTL application
13.2 MODE pin
13.3 Output power estimation
= 2 V (p-p); R
i
= 1 kHz; f
When using the power amplifier in a mono BTL application the inputs of both channels
must be connected in parallel and the phase of one of the inputs must be inverted (see
Figure
single-ended demodulation filters.
For pop-noise free start-up an RC time-constant must be applied on the MODE pin. The
bias-current setting of the VI-converter input is directly related to the voltage on the MODE
pin. In turn the bias-current setting of the VI converters is directly related to the DC output
offset voltage. Thus a slow dV/dt on the MODE pin results in a slow dV/dt for the DC
output offset voltage, resulting in pop-noise free start-up. A time-constant of 500 ms is
sufficient to guarantee pop-noise free start-up (see also
The achievable output powers in several applications (SE and BTL) can be estimated
using the following expressions:
SE:
P
o 1%
i
= 1 kHz.
6). In principle the loudspeaker can be connected between the outputs of the two
s
osc
=
= 0 .
---------------------------------------------------------------------------------------- -
= 317 kHz; R
------------------- -
R
L
Conditions
operating
V
R
+
i(CM)
L
R
mute
0.6
s
= 0
= 1 V (RMS)
DSon
V
sL
Rev. 01 — 1 October 2004
P
2
measurement. See also
< 0.1
…continued
1 t
R
–
L
[1]
min
; T
amb
f
osc
= 25 C; unless otherwise specified.
[5]
[6]
[7]
2
s
Section
Min
-
-
-
-
.
13.3.
2
Figure
Typ
300
220
200
75
50 W class-D power amplifier
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
4,
5
TDA8922B
and 7).
Max
-
-
-
-
Unit
dB
15 of 32
V
V
V
(1)