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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

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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

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

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

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.