tfa9810t-n1 NXP Semiconductors, tfa9810t-n1 Datasheet - Page 20

• Manufacturer Part Number: tfa9810t-n1
• Description: Tfa9810 Stereo Full-bridge Audio Amplifier 2 X 12 W
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TFA9810_2
Preliminary data sheet
14.2 Output current limiting
14.3 Speaker configuration and impedance
14.4 Differential input
The peak output current is internally limited above a level of 3 A minimum. During normal
operation the output current should not exceed this threshold level of 3 A, otherwise the
output signal will be distorted. The peak output current in BTL can be estimated using
Equation
Where:
Example:
A 4
running into current limiting. Current limiting (clipping) will avoid audio holes, but it causes
a sound distortion similar 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 12.
For a high common-mode rejection ratio and a maximum of flexibility in the application,
the audio inputs of the application are fully differential.
The input configuration for a differential-input application is illustrated in
I
Configuration
BTL
O
•
•
•
•
max
V
R
R
R
P
L
DSon
s
speaker in BTL configuration can be used up to a supply voltage of 12 V without
= series resistance [ ].
= load resistance [ ].
= supply voltage (V
----------------------------------------------------- -
R
3:
L
= drain-source on-state resistance [ ].
Filter component values
+
Table 12
2
V
R
P
DSon
shows the practical required values:
Rev. 02 — 30 August 2007
Impedance [ ]
4
6
8
+
R
DDPx
s
3 A
LC
V
SSPx
and C
) [V].
LC
according to the speaker configuration and
L
10
16
22
LC
[ F]
Audio amplifier 2 x 12 W
C
1500
1000
680
LC
© NXP B.V. 2007. All rights reserved.
TFA9810
[nF]
Figure
28.
20 of 29
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