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Philips Semiconductors
7.2 Pin description
8. Functional description
8.1 Input configuration
8.2 Power amplifier
8.2.1 Output power measurement
TFA9843AJ_1
Preliminary data sheet
Table 3.
Pin description
Symbol
Pin
IN2
1
OUT2
2
CIV
3
IN1
4
GND
5
SVR
6
VC
7
OUT1
8
V
9
CC
The input cut-off frequency is as follows:
1
f
=
---------------------------- -
i 3dB
–
2
R
C
i
i
Single-ended application: R
1
f
=
---------------------------------------------------------------- -
i 3dB
–
3
2
60 10
As shown in
Equation
switch-on delay during charging of the input capacitors can be minimized. This results in a
good low frequency response and good switch-on behavior.
The TFA9843AJ has clamps on the inputs. In Standby mode the voltage on the input pins
is clamped for voltages lower than 0.1 V. When the TFA9843AJ is in Mute, Volume
control or Operating mode (maximum gain) the input clamp voltage is 1 V (RMS).
The power amplifier is a single-ended amplifier with an all NPN output stage, capable of
delivering a peak output current of 4 A.
The output power as a function of the supply voltage is measured on the output pins at
THD = 10 %; see
Figure
26 V and the maximum available output current is 4 A repetitive peak current. A minimum
load of 3
is required for supply voltages > 22 V; see
measured with one channel driven.
20 W stereo power amplifier with volume control
Description
input 2
loudspeaker terminal 2
common input voltage decoupling
input 1
ground
half supply voltage decoupling (ripple rejection)
volume control input (standby, mute and volume control)
loudspeaker terminal 1
supply voltage
= 60 k and C
i
i
=
12 Hz
9 –
220 10
2, large capacitor values for the inputs are not necessary; therefore
7. The maximum output power is limited by the supply voltage of
Rev. 01 — 28 April 2006
TFA9843AJ
= 220 nF:
Figure
4. The output power is
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
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