Datasheet

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TYPICAL CHARACTERISTICS
TABLE OF GRAPHS
TEST SETUP FOR GRAPHS
50
30
20
0
0 0.5 1 1.5 2
Efficiency − %
70
80
100
2.5 3 3.5
10
40
60
90
P
O
− Output Power − W
R
L
= 3 Ω, 33 µH
Class-AB,
R
L
= 4 Ω
R
L
= 4 Ω, 33 µH
R
L
= 8 Ω, 33 µH
TPA2000D1
SLOS328F – JUNE 2000 – REVISED MARCH 2004
FIGURE
η Efficiency vs Output power 1
FFT at 1.5-W output power vs Frequency 2
vs Output power 3, 4, 5
THD+N Total harmonic distortion plus noise
vs Frequency 6, 7
k
(SRR)
Supply ripple rejection ratio vs Frequency 8
The THD+N measurements shown do not use an LC output filter, but do use a 100-Ω, 0.047-µF RC low-pass
filter with a cutoff frequency of ~30 kHz before the audio analyzer so the switching frequency does not dominate
the measurement. This is done to ensure that the THD+N measured is just the audible THD+N. The THD+N
measurements are shown at the highest gain for worst case. The efficiency was measured with no filters, and a
3-Ω, 4-Ω, or 8-Ω resistor in series with a 33-µH inductor as the load.
EFFICIENCY
vs
OUTPUT POWER
Figure 1.
6