TDA8932B NXP Semiconductors, TDA8932B Datasheet - Page 22

• Manufacturer Part Number: TDA8932B
• Description: The TDA8932B is a high efficiency class-D amplifier with low power dissipation
• Manufacturer: NXP Semiconductors

NXP Semiconductors
14. Application information
TDA8932B_4
Product data sheet
14.1 Output power estimation
The output power P
configuration can be estimated using
SE configuration:
BTL configuration:
Where:
The output power P
Figure 8
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
P
P
j
o 0.5%
o 0.5%
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 impedance ( )
= oscillator frequency (Hz); 320 kHz typical with Rosc = 39 k
= equivalent series resistance SE capacitor ( )
= minimum pulse width (s); 80 ns typical
=
= on-resistance power switch ( )
=
=
and
1.25 P
------------------------------------------------------------------------------------------------------------------------------------------ -
------------------------------------------------------------------------------------------------------------------------------------- -
----------------------------------------------------------
----------------------------------------------------- -
Figure 9
R
R
s
L
L
= 0.05 , R
+
+
2
R
o 0.5%
o
o
DSon
Rev. 04 — 18 December 2008
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
DDP1
L
DSon
+
L
R
ESR
s
+
+
R
V
= 0.05
R
s
ESR
SSP1
2
8
R
(V) or V
Equation 2
R
1 t
L
L
1 t
–
and I
–
w min
w min
DDP2
O(ocp)
and
f
= 4 A (minimum).
osc
V
f
Equation
osc
SSP2
V
(V)
P
V
P
2
3.
2
Class-D audio amplifier
DSon
TDA8932B
= 0.15
© NXP B.V. 2008. All rights reserved.
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