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TDA8932B Datasheet(PDF) 24 Page - NXP Semiconductors

Part No. TDA8932B
Description  Class-D audio amplifier
Download  48 Pages
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Maker  NXP [NXP Semiconductors]
Homepage  http://www.nxp.com
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TDA8932B Datasheet(HTML) 24 Page - NXP Semiconductors

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TDA8932B_4
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 04 — 18 December 2008
24 of 48
NXP Semiconductors
TDA8932B
Class-D audio amplifier
14.2 Output current limiting
The peak output current IO(max) is internally limited above a level of 4 A (minimum). During
normal operation the output current should not exceed this threshold level of 4 A
otherwise the output signal is distorted. The peak output current in SE or BTL
configurations can be estimated using Equation 5 and Equation 6.
SE configuration:
(5)
BTL configuration:
(6)
Where:
VP = supply voltage VDDP1 − VSSP1 (V) or VDDP2 − VSSP2 (V)
RL = load impedance (Ω)
RDSon = on-resistance power switch (Ω)
Rs = series resistance output inductor (Ω)
RESR = equivalent series resistance SE capacitor (Ω)
Example:
A4
Ω speaker in the BTL configuration can be used up to a supply voltage of 18 V without
running into current limiting. Current limiting (clipping) will avoid audio holes but it causes
a comparable distortion like voltage clipping.
14.3 Speaker configuration and impedance
For a flat frequency response (second-order Butterworth filter) it is necessary to change
the low-pass filter components Llc and Clc according to the speaker configuration and
impedance. Table 14 shows the practical required values.
14.4 Single-ended capacitor
The SE capacitor forms a high-pass filter with the speaker impedance. So the frequency
response will roll-off with 20 dB per decade below f-3dB (3 dB cut-off frequency).
I
O max
()
0.5
V
P
×
R
L
R
DSon
R
s
R
ESR
++
+
----------------------------------------------------------
4A
≤≤
I
O max
()
V
P
R
L
2
+
R
DSon
R
s
+
()
×
------------------------------------------------------
4A
≤≤
Table 14.
Filter component values
Configuration
RL (Ω)
Llc (
µH)
Clc (nF)
SE
4
22
680
6
33
470
8
47
330
BTL
4
10
1500
6
15
1000
8
22
680


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