Audio Amplifiers 2X15W BTL CLASS D AMP+VOLCTRL

TDA8932T

Manufacturer Part NumberTDA8932T
DescriptionAudio Amplifiers 2X15W BTL CLASS D AMP+VOLCTRL
ManufacturerNXP Semiconductors
TDA8932T datasheet
 


Specifications of TDA8932T

ProductClass-DOutput Power50 W
Available Set Gain36 dBCommon Mode Rejection Ratio (min)56 dB
Thd Plus Noise0.015 %Operating Supply Voltage22 V
Maximum Power Dissipation5000 mWMaximum Operating Temperature+ 85 C
Mounting StyleSMD/SMTAudio Load Resistance8 Ohms
Dual Supply Voltage+/- 11 VInput Signal TypeDifferential
Minimum Operating Temperature- 40 COutput Signal TypeDifferential, Single
Supply TypeSingle or DualSupply Voltage (max)36 V
Supply Voltage (min)10 VOutput Type1-Channel Mono or 2-Channel Stereo
Package / CaseSOIC-32Lead Free Status / RoHS StatusLead free / RoHS Compliant
Other namesTDA8932T/N1,112  
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NXP Semiconductors
14.2 Output current limiting
The peak output current I
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
SE configuration:
I
O max
BTL configuration:
I
O max
Where:
V
= supply voltage V
P
R
= load impedance [ ]
L
R
DSon
R
= series resistance output inductor [ ]
s
R
ESR
Example:
A 4
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.
Configuration
SE
BTL
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
TDA8932_2
Preliminary data sheet
is internally limited above a level of 4 A (minimum). During
O(max)
0.5 V
P
----------------------------------------------------------
4 A
R
+
R
+
R
+
R
L
DSon
s
ESR
V
P
----------------------------------------------------- -
4 A
R
+
2
R
+
R
L
DSon
s
V
[V] or V
DDP1
SSP1
= on-resistance power switch [ ]
= equivalent series resistance SE capacitor [ ]
Table 14
shows the practical required values.
Filter component values
R
( )
L
4
6
8
4
6
8
Rev. 02 — 12 December 2006
Class-D audio amplifier
Equation 5
and
Equation
6.
V
[V]
DDP2
SSP2
Llc ( H)
Clc (nF)
22
680
33
470
47
330
10
1500
15
1000
22
680
(3 dB cut-off frequency).
-3dB
TDA8932
(5)
(6)
© NXP B.V. 2006. All rights reserved.
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