參數(shù)資料
型號(hào)： TPA3008D2PHPR
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻／視頻放大
英文描述： 10 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP48
封裝： GREEN, PLASTIC, HTQFP-48
文件頁(yè)數(shù)： 7/31頁(yè)
文件大?。?/td> 654K
代理商： TPA3008D2PHPR
Efficiency (theoretical, %) +
R
L
R
L )
r
ds(on)
100% +
8
(8 ) 1.3)
100% + 86%
P
(total) +
P
O
Efficiency
+
8.5 W
0.86
+ 9.88 W
Other losses + P(total)(measured) * P(total) (theoretical) + 10.49 * 9.88 + 0.61 W
P
(dis) +
0.61 W * (12 V
22 mA) + 0.35 W
0.1
F
0.1
F
0.47
F
33
H
33
H
OUTP
OUTN
L1
L2
C1
C2
C3
www.ti.com
SLOS435C – MAY 2004 – REVISED AUGUST 2010
Damage may occur if the voice coil cannot handle the additional heat generated from the high-frequency
switching current. The amount of power dissipated in the speaker may be estimated by first considering the
overall efficiency of the system. If the on-resistance (rds(on)) of the output transistors is considered to cause the
dominant loss in the system, then the maximum theoretical efficiency for the TPA3008D2 with an 8-
load is as
follows:
(1)
The maximum measured output power is approximately 8.5 W with an 12-V power supply. The total theoretical
power supplied (P(total)) for this worst-case condition would therefore be as follows:
(2)
The efficiency measured in the lab using an 8-
speaker was 81%. The power not accounted for as dissipated
across the rDS(on) may be calculated by simply subtracting the theoretical power from the measured power:
(3)
The quiescent supply current at 12 V is measured to be 22 mA. It can be assumed that the quiescent current
encapsulates all remaining losses in the device, i.e., biasing and switching losses. It may be assumed that any
remaining power is dissipated in the speaker and is calculated as follows:
(4)
Note that these calculations are for the worst-case condition of 8.5 W delivered to the speaker. Because the 0.35
W is only 4% of the power delivered to the speaker, it may be concluded that the amount of power actually
dissipated in the speaker is relatively insignificant. Furthermore, this power dissipated is well within the
specifications of most loudspeaker drivers in a system, as the power rating is typically selected to handle the
power generated from a clipping waveform.
When to Use an Output Filter for EMI Suppression
Design the TPA3008D2 without the filter if the traces from amplifier to speaker are short (< 50 cm). Powered
speakers, where the speaker is in the same enclosure as the amplifier, is a typical application for class-D without
a filter.
Most applications require a ferrite bead filter. 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 low impedance at low frequencies.
Use a LC output filter if there are low frequency (<1 MHz) EMI-sensitive circuits and/or there are long wires from
the amplifier to the speaker.
When both an LC filter and a ferrite bead filter are used, the LC filter should be placed as close as possible to
the IC followed by the ferrite bead filter.
Figure 19. Typical LC Output Filter, Cutoff Frequency of 27 kHz, Speaker Impedance = 8
Copyright 2004–2010, Texas Instruments Incorporated
15
Product Folder Link(s): TPA3008D2
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