TYPICAL CHARACTERISTICS

Test Setup for Graphs

EFFICIENCY

vs

OUTPUT POWER

50

30

20

0

0

0.5

1

1.5

2

70

80

100

2.5

3

3.5

10

40

60

90

Class-AB,

TPA2000D1-Q1

Table of Graphs

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 + noise

vs Frequency

6, 7

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.

Figure 1.

6

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