Philips TDA8928J Manual De Usuario

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.

1. V

P

=

±

12.5 V; R

L

= 8

Ω

; 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.

Single-ended application; note 1

P

o

output power

R

L

= 8

Ω

THD = 0.5 %

7

8

−

W

THD = 10 %

9

10

−

W

R

L

= 16

Ω

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

−

%