TFA9842AJ Philips, TFA9842AJ Datasheet - Page 4

• Manufacturer Part Number: TFA9842AJ
• Description: 7.5W Stereo Power Amplifier
• Manufacturer: Philips

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Philips Semiconductors
8. Functional description
TFA9842AJ_1
Preliminary specification
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.
D
a
8.2.1 Output power measurement
7.2 Pin description
8.1 Input configuration
8.2 Power amplifier
t
a
Table 3.
The input cut-off frequency is:
Single-ended application: R
As shown in
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 TFA9842AJ 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 TFA9842AJ 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 3 A.
The output power as a function of the supply voltage is measured on the output pins at
THD = 10 %; see
26 V and the maximum available output current is 3 A repetitive peak current. A minimum
load of 3
measured with one channel driven.
Symbol
IN2
OUT2
CIV
IN1
GND
SVR
VC
OUT1
V
f
f
i 3dB
i 3dB
CC
S
–
–
h
=
=
e
Pin description
---------------------------- -
2
---------------------------------------------------------------- -
2
is required for supply voltages > 22 V; see
Equation
e
R
60 10
1
i
Pin
1
2
3
4
5
6
7
8
9
t
Figure
C
i
4
3
2, large capacitor values for the inputs are not necessary; therefore
1
Rev. 01 — 28 April 2006
U
220 10
7. The maximum output power is limited by the supply voltage of
i
.
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
c
9 –
o
=
7.5 W stereo power amplifier with volume control
m
12 Hz
i
= 220 nF:
Figure
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
4. The output power is
TFA9842AJ
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(1)
(2)