Figure 4, The output po, Figure 5 – Philips TFA9843AJ User Manual
Page 8: Tfa9843aj, Philips semiconductors, 20 w stereo power amplifier with volume control
TFA9843AJ_1
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Preliminary data sheet
Rev. 01 — 28 April 2006
8 of 19
Philips Semiconductors
TFA9843AJ
20 W stereo power amplifier with volume control
[1]
The noise output voltage is measured at the output in a frequency range from 20 Hz to 22 kHz
(unweighted), with a source impedance Z
S
= 0
Ω
at the input.
[2]
Supply voltage ripple rejection is measured at the output, with a source impedance Z
S
= 0
Ω
at the input
and with a frequency range from 20 Hz to 22 kHz (unweighted). The ripple voltage is a sine wave with a
frequency f
ripple
and an amplitude of 300 mV (RMS), which is applied to the positive supply rail.
[3]
Output voltage in Mute mode (V
I(VC)
= 1.35 V) and an input voltage of 1 V (RMS) in a bandwidth from 20 Hz
to 22 kHz, including noise.
V
CC
= 18 V
THD = 10 %
Fig 3.
Voltage gain as a function of volume control
voltage
Fig 4.
Output power (one channel) as a function of
supply voltage for various loads
001aae340
V
I(VC)
(V)
0
6.0
4.0
2.0
−
50
−
100
0
50
G
V
(dB)
−
150
8
40
60
20
0
12
28
V
CC
(V)
16
20
P
o
(W)
24
mce485
R
L
= 1
Ω
8
Ω
4
Ω
3
Ω
2
Ω
V
CC
= 18 V; f = 1 kHz; R
L
= 4
Ω
V
CC
= 18 V; P
o
= 1 W; R
L
= 4
Ω
Fig 5.
Total harmonic distortion-plus-noise as a
function of output power
Fig 6.
Total harmonic distortion-plus-noise as a
function of frequency
10
2
10
1
10
−
1
10
−
2
mce488
10
−
1
10
2
1
10
P
o
(W)
THD
+
N
(%)
10
1
10
−
1
10
−
2
001aaa446
10
THD
+
N
(%)
f (Hz)
10
2
10
3
10
4
10
5