TDA8933B NXP Semiconductors, TDA8933B Datasheet - Page 24

• Manufacturer Part Number: TDA8933B
• Description: The TDA8933B is a high-efficiency class D amplifier with low power dissipation
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TDA8933B_1
Preliminary data sheet
14.2 Output current limitation
14.3 Speaker configuration and impedance
The peak output current I
normal operation the output current should not exceed this threshold level, otherwise the
signal will be distorted. The peak output current in SE or BTL configurations can be
calculated using
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 with an output frequency of
40 kHz) it is necessary to change the low-pass filter components L
to the speaker configuration and impedance.
practice.
Table 14.
I
I
Configuration
SE
BTL
O max
O max
•
•
•
•
•
V
R
R
R
R
P
L
DSon
s
ESR
= series resistance output inductor (
= load resistance (
= supply voltage V
speaker in the BTL configuration can be used up to a supply voltage of 18 V
----------------------------------------------------------
R
----------------------------------------------------- -
R
= Equivalent Series Resistance SE capacitance (
= drain-source on-state resistance (
Filter component values
L
L
+
+
R
2
DSon
0.5 V
Equation 5
V
R
P
DSon
+
Rev. 01 — 23 October 2008
R
R
4
6
8
8
16
P
s
L
+
+
O(max)
( )
DDP1
R
R
and
s
ESR
is internally limited to a minimum value of 2 A. During
2 A
Equation
V
2 A
SSP1
(V) or V
6.
Table 14
L
22
33
47
22
47
LC
DDP2
( H)
V
shows the values required in
SSP2
(V)
Class D audio amplifier
LC
TDA8933B
C
680
470
330
680
330
LC
and C
© NXP B.V. 2008. All rights reserved.
(nF)
LC
according
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(5)
(6)