Texas Instruments APA100 Instrukcja Użytkownika Pobierz pdf (Strona 41)

Supply Ripple Rejection

5-7

Measured Results

5.6 Supply Ripple Rejection

The APA100 uses a closed loop which keeps the gain from changing with

supply voltage and improves the supply ripple rejection ratio (k

SRR

) over an

open−loop class-D amplifier. The supply ripple rejection ratio versus

frequency curve is shown in Figure 5−9.

Figure 5−9. APA100 Supply Ripple Rejection Ratio vs Frequency With 8-W Load

−10

−20

−30

−40

−50

−60

−70

−80

20 100 200 1 k 2 k 10 k 20 k

− Supply Voltage Rejection Ratio − V

f − Frequency − Hz

1 2 ... 36 37 38 39 40 41 42

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Texas Instruments APA100 Instrukcja Użytkownika Strona 41