TDA8933 NXP Semiconductors, TDA8933 Datasheet - Page 24

• Manufacturer Part Number: TDA8933
• Description: Class-D audio amplifier
• Manufacturer: NXP Semiconductors

NXP Semiconductors
14. Application information
TDA8933_1
Preliminary data sheet
14.1 Output power estimation
P
P
The output power P
configurations can be estimated using
SE configuration:
BTL configuration:
Where:
The output power P
Figure 7
THD+N = 10 % as a function of the supply voltage for SE and BTL configurations at
different load impedances. The output power is calculated with: R
T
P
o 0.5 %
o 0.5 %
j
o 10 %
V
R
R
R
R
t
f
= 25 C), R
w(min)
osc
P
L
DSon
s
ESR
= series resistance output inductor (
= supply voltage V
= load resistance (
= oscillator frequency (Hz); 320 kHz typical with R
= equivalent series resistance SE capacitance ( )
= minimum pulse width (s); 80 ns typical
= drain-source on-state resistance (
=
=
=
and
------------------------------------------------------------------------------------------------------------------------------------------ -
-------------------------------------------------------------------------------------------------------------------------------------- -
1.25 P
Figure 8
----------------------------------------------------------
R
------------------------------------------------------ -
R
s
L
L
= 0.05 , R
+
+
R
2
o 0.5 %
o
o
DSon
at THD+N = 0.5 %, just before clipping, for the SE and BTL
at THD+N = 10 % can be estimated by:
show the estimated output power at THD+N = 0.5 % and
R
R
R
Rev. 01 — 15 May 2007
DDP1
L
DSon
+
L
R
ESR
s
+
- V
+
R
= 0.05
R
SSP1
s
ESR
2
8
www.DataSheet.co.kr
(V) or V
R
R
Equation 2
1 t
L
L
1 t
–
and I
–
w min
w min
DDP2
O(ocp)
- V
and
f
= 2 A (minimum).
osc
f
SSP2
osc
Equation
osc
V
(V)
= 39 k
V
P
P
2
2
3.
Class-D audio amplifier
DSon
TDA8933
= 0.35
© NXP B.V. 2007. All rights reserved.
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