TDF8599_1

© NXP B.V. 2008. All rights reserved.

Product data sheet

Rev. 01 — 13 November 2008

33 of 52

NXP Semiconductors

TDF8599

Class-D power amplifier with load diagnostics

[5]

[6]

[7]

14. Application information

14.1 Output power estimation (Stereo mode)

The output power, just before clipping, can be estimated using the following equations:

(5)

Where,

The output power at 10 % THD can be estimated by:

Where

Figure 27 and Figure 28 show the estimated output power at THD = 0.5 % and

THD = 10 % as a function of supply voltage for different load impedances at stereo mode.

P

o

R

L

R

L

2R

DSon

R

S

+

()

×

+

------------------------------------------------------





1t

Wmin

()

f

osc

2

----------

×

–





V

p

×





2

×





2R

L

×

-----------------------------------------------------------------------------------------------------------------------------------------

=

P

02

()

1.25

P

o1

()

×

=