AN10436 PHILIPS [NXP Semiconductors], AN10436 Datasheet - Page 20

• Manufacturer Part Number: AN10436
• Description: TDA8932B/33(B) Class-D audio amplifier
• Manufacturer: PHILIPS [NXP Semiconductors]

NXP Semiconductors
AN10436_1
Application note
Fig 10. SE output power as a function of supply voltage
(W)
P
o
a. THD+N = 0.5 %
40
30
20
10
0
10
3.1.1 TDA8932B output power estimation
Where:
Remark:
The output power at 10 % THD can be estimated as follows:
Figure
TDA8932B at THD = 0.5 % and THD = 10 % as a function of the supply voltage for SE
and BTL for different load impedances.
BTL: P
P
20
o(10%)
V
R
R
R
R
t
f
Peak output current ≤ 4 A for TDA8932B (see
Peak output current ≤ 2 A for TDA8933(B).
W(min)
osc
P
L
DSon
s
ESR
= series resistance output inductor (Ω)
= load impedance (Ω)
= supply voltage (V) (V
= oscillator frequency (Hz) (320 kHz typical R7 = 39 kΩ)
10,
o(0.5%)
= equivalent series resistance of SE capacitance (Ω)
=
= on-resistance power switch (Ω)
= minimum pulse width (s) (80 ns typical)
Equation 9
1.25 P
Figure
30
R
=
L
⋅
= 4
⎛
⎝
---------------------------------------------------------------------------------------------------------------------------- -
8
6
V
⎛
⎝
o(0.5%)
11,
P
--------------------------------------------------- -
R
001aad768
(V)
L
Rev. 01 — 12 December 2007
and
+
Figure
2
40
⋅
Equation 10
(
R
R
DDP
DSon
12, and
L
− V
+
Fig 11. SE output power as a function of supply voltage
R
SSP
s
Figure 13
)
2 R
⎞
⎠
are valid only when:
(W)
P
)
⋅
⋅
o
40
30
20
10
(
0
1 t
L
b. THD+N = 10 %
10
–
W min
TDA8932B/33(B) Class-D audio amplifier
show the estimated output power for the
(
Section
)
⋅
f
osc
20
3.2).
) V
⋅
P
⎞
⎠
2
R
L
30
= 4
6
8
AN10436
© NXP B.V. 2007. All rights reserved.
V
P
001aad769
(V)
40
20 of 55
(10)
(11)