tda8933t-n1 NXP Semiconductors, tda8933t-n1 Datasheet - Page 26

• Manufacturer Part Number: tda8933t-n1
• Description: Tda8933 Class-d Audio Amplifier
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TDA8933_1
Preliminary data sheet
14.2 Output current limiting
14.3 Speaker configuration and impedance
The peak output current I
operation the output current should not exceed this threshold level, otherwise the signal is
distorted. The peak output current in SE or BTL configurations can be calculated using
Equation 5
SE configuration:
BTL configuration:
Where:
Example:
An 8
without running into current limiting. Current limiting (clipping) will avoid audio holes but
produces a similar distortion to voltage clipping.
For a flat frequency response (second order Butterworth filter) it is necessary to change
the low-pass filter components L
impedance.
Table 14.
I
I
Configuration
SE
BTL
O max
O max
V
R
R
R
R
P
L
DSon
s
ESR
= series resistance (
= supply voltage V
= load resistance (
speaker in the BTL configuration can be used up to a supply voltage of 18 V
= equivalent series resistance SE capacitance (
= drain-source on-state resistance (
----------------------------------------------------------
R
----------------------------------------------------- -
R
Filter component values
L
L
and
Table 14
+
+
R
2
Equation
DSon
0.5 V
V
R
P
DSon
+
shows the required values in practice.
R
R
4
6
8
8
16
P
Rev. 01 — 15 May 2007
DDP1
s
L
+
+
OM
6.
( )
R
R
s
ESR
is internally limited to 2 A (minimum). During normal
- V
SSP1
LC
2 A
and C
2 A
(V) or V
LC
according to the speaker configuration and
DDP2
L
22
33
47
22
47
LC
( H)
- V
SSP2
(V)
Class-D audio amplifier
C
680
470
330
680
330
LC
TDA8933
© NXP B.V. 2007. All rights reserved.
(nF)
26 of 47
(5)
(6)