TFA9843AJ_1
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Preliminary data sheet
Rev. 01 — 28 April 2006
4 of 19
Philips Semiconductors
TFA9843AJ
20 W stereo power amplifier with volume control
7.2 Pin description
8.
Functional description
8.1 Input configuration
The input cut-off frequency is as follows:
(1)
Single-ended application: R
i
= 60 k
Ω
and C
i
= 220 nF:
(2)
As shown in
, large capacitor values for the inputs are not necessary; therefore
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).
8.2 Power amplifier
The power amplifier is a single-ended amplifier with an all NPN output stage, capable of
delivering a peak output current of 4 A.
8.2.1 Output power measurement
The output power as a function of the supply voltage is measured on the output pins at
THD = 10 %; see
. The maximum output power is limited by the supply voltage of
26 V and the maximum available output current is 4 A repetitive peak current. A minimum
load of 3
Ω
is required for supply voltages > 22 V; see
. The output power is
measured with one channel driven.
Table 3.
Pin description
Symbol
Pin
Description
IN2
1
input 2
OUT2
2
loudspeaker terminal 2
CIV
3
common input voltage decoupling
IN1
4
input 1
GND
5
ground
SVR
6
half supply voltage decoupling (ripple rejection)
VC
7
volume control input (standby, mute and volume control)
OUT1
8
loudspeaker terminal 1
V
CC
9
supply voltage
f
i
3dB
–
(
)
1
2
π
R
i
C
i
×
(
)
-----------------------------
=
f
i
3dB
–
(
)
1
2
π
60
10
3
×
220
×
10
9
–
×
(
)
-----------------------------------------------------------------
12 Hz
=
=
