Filter
Top Products
2004 May 05 9
Philips Semiconductors Preliminary specification
Power stage 2 x 10 or 1 x 20 W class-D
audio amplifier
TDA8928J
13 AC CHARACTERISTICS
V
P
= ±12.5 V; T
amb
=25°C; unless otherwise specified.
Notes
1. V
P
= ±12.5 V; R
L
=8Ω; f
i
= 1 kHz; f
osc
= 310 kHz; R
s
= 0.1 Ω (series resistance of filter coil); T
amb
=25°C;
measured in reference design (SE application) shown in Fig.5; unless otherwise specified.
2. Indirectly measured; based on R
ds(on)
measurement.
3. Total Harmonic Distortion (THD) is measured in a bandwidth of 22 Hz to 20 kHz (AES 17 brickwall filter). When
distortion is measured using a low-order low-pass filter a significantly higher value will be found, due to the switching
frequency outside the audio band. Measured using the typical application circuit, given in Fig.5.
4. Efficiency for power stage.
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
Single-ended application; note 1
P
o
output power R
L
=8Ω
THD = 0.5 % 7
(2)
8 − W
THD = 10 % 9
(2)
10 − W
R
L
=16Ω
THD = 0.5 % − 4 − W
THD = 10 % − 5 − W
THD total harmonic distortion P
o
= 1 W; note 3
f
i
= 1 kHz − 0.05 0.1 %
f
i
= 10 kHz − 0.2 − %
η efficiency endstage P
o
=2× 10 W; f
i
= 1 kHz; note 4 − 90 − %