TFA9841J NXP Semiconductors, TFA9841J Datasheet - Page 4

• Manufacturer Part Number: TFA9841J
• Description: Audio Amplifiers 1 X 7W SINGLE ENDED
• Manufacturer: NXP Semiconductors

Specifications of TFA9841J

• Product: Class-AB
• Output Power: 7.5 W
• Available Set Gain: 26 dB
• Thd Plus Noise: 0.1 %
• Operating Supply Voltage: 17 V
• Maximum Power Dissipation: 8000 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• Audio Load Resistance: 4 Ohms
• Input Signal Type: Single
• Minimum Operating Temperature: - 40 C
• Output Signal Type: Single
• Supply Type: Single
• Supply Voltage (max): 26 V
• Supply Voltage (min): 9 V
• Output Type: 1-Channel Mono
• Package / Case: DBSP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: TFA9841J/N1,112

Philips Semiconductors
9397 750 12014
Preliminary data
8.2.1 Output power measurement
8.2.2 Headroom
8.2 Power amplifier
8.3 Mode selection
As shown in
the 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 power amplifier is a Single-Ended (SE) 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
The maximum output power is limited by the supply voltage of 26 V and the maximum
available output current is 3 A (repetitive peak current).
A minimum load of 4
Typical CD music requires at least 12 dB (factor 15.85) dynamic headroom,
compared to the average power output, for transferring the loudest parts without
distortion. At V
Average Listening Level (ALL) music power without any distortion yields:
The power dissipation can be derived from
12 dB, respectively (see
Table 4:
For the average listening level a power dissipation of 2.2 W can be used for a
heatsink calculation.
The TFA9841J has three functional modes, which can be selected by applying the
proper DC voltage to pin MODE (see
Table 5:
P
Headroom
0 dB
12 dB
V
0 to 0.8 V
4.5 V to (V
(V
o ALL
MODE
CC
2.0 V) to V
=
CC
5 10
---------------
Power rating as function of headroom
Mode selection
15.85
Equation
3.5 V)
CC
3
Power output (THD = 0.2 %)
P
P
CC
Rev. 01 — 06 February 2004
o
o(ALL)
= 18 V and P
=
= 5 W
Figure
315 mW
2, large capacitor values for the inputs are not necessary, so
= 315 mW
is required for V
Table
5.
4).
o
= 5 W (R
Table 5
CC
L
> 22 V; see
= 4 ) at THD = 0.2 % (see
Amplifier
standby
mute
on
Figure 9
and
Power dissipation
P
P
1-channel audio amplifier (1 x SE)
D
D
Figure
= 4.4 W
= 2.2 W
for a headroom of 0 dB and
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Figure 6
3).
TFA9841J
Figure
7), the
4 of 17
(3)