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TYPICAL CHARACTERISTICS

TEST SET-UP FOR GRAPHS

C2

C1

L1

L2

OUT–

OUT+

TPA2000D2

SLOS291F – MARCH 2000 – REVISED MARCH 2007

Table of Graphs

FIGURE

η

Efficiency

vs Output power

2, 3

FFT at 1.5 W output power

vs Frequency

4

vs Output power

5-7

THD+N

Total harmonic distortion plus noise

vs Frequency

8, 9

Crosstalk

vs Frequency

10

Power supply rejection ratio

vs Frequency

11

The THD+N measurements shown do not use an LC output filter, but use a low pass filter with a cutoff

frequency of 20 kHz 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 LC output filter used in the efficiency curves (Figure 2 and Figure 3) is shown in Figure 1.

L1 = L2 = 22 µH (DCR = 110 m

Ω,

Part number = SCD0703T-220 M-S,

Manufacturer = GCI)

C1 = C2 = 1 µF

The ferrite filter used in the efficiency curves (Figure 2 and Figure 3) is shown in Figure 1, where L is a ferrite

bead.

L1 = L2 = ferrite bead (part number = 2512067007Y3, manufacturer = Fair-Rite)

C1 = C2 = 1 nF

Figure 1. Class-D Output Filter

5

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