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0 V
–12 V
+12 V
Current
OUTP
OUTN
Differential
Voltage
Across
Load
0 V
–12 V
+12 V
Current
OUTP
OUTN
Differential
Voltage
Across
Load
Output = 0 V
Output > 0 V
DRIVING THE OUTPUT INTO CLIPPING
P
O(10% THD)
+ P
O(1% THD)
1.25
(1)
OUTPUT FILTER CONSIDERATIONS
TPA3007D1
SLOS418D – SEPTEMBER 2003 – REVISED MARCH 2008
Figure 15. The TPA3007D1 Output Voltage and Current Waveforms Into an Inductive Load
The output of the TPA3007D1 may be driven into clipping to attain a higher output power than is possible with no
distortion. Clipping is typically quantified by a THD measurement of 10%. The amount of additional power into
the load may be calculated with Equation 1 .
A ferrite bead filter (shown in Figure 16 ) should be used in order to pass FCC and/or CE radiated emissions
specifications and if a frequency sensitive circuit operating higher than 1 MHz is nearby. The ferrite filter reduces
EMI around 1 MHz and higher (FCC and CE only test radiated emissions greater than 30 MHz). When selecting
a ferrite bead, choose one with high impedance at high frequencies, but very low impedance at low frequencies.
Use an additional LC output filter if there are low frequency (<1 MHz) EMI sensitive circuits and/or there are long
wires (greater than 11 inches) from the amplifier to the speaker, as shown in Figure 17 .
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Product Folder Link(s): TPA3007D1