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參數資料
| 型號： | TPA2051D3YFFT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2.9 W, 2 CHANNEL, AUDIO AMPLIFIER, PBGA25 |
| 封裝： | 2.16 X 2.11 MM, 0.40 MM PITCH, GREEN, WCSP-25 |
| 文件頁數： | 18/34頁 |
| 文件大小： | 1594K |
| 代理商： | TPA2051D3YFFT |
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DECOUPLING CAPACITOR
INPUT CAPACITORS
C
I
1
=
(2
R
C )
p
(1)
www.ti.com ..................................................................................................................................................... SLOS641A – JUNE 2009 – REVISED OCTOBER 2009
Table 7 gives the possible selections for the release time.
Table 7. Release Time Selection
RELEASE TIME
REGISTER BYTE:
(MS/STEP)
REGISTER BYTE:
(MS/STEP)
REL_TIME[4:0]
00000
41
10000
697
00001
82
10001
738
00010
123
10010
779
00011
164
10011
820
00100
205
10100
861
00101
246
10101
902
00110
287
10110
943
00111
328
10111
984
01000
369
11000
1025
01001
410
11001
1066
01010
451
11010
1107
01011
492
11011
1148
01100
533
11100
1189
01101
574
11101
1230
01110
615
11110
1271
01111
656
11111
1312
The TPA2051D3 is a high-performance Class-D audio amplifier that requires adequate power supply decoupling
to ensure the efficiency is high and total harmonic distortion (THD) is low. For higher frequency transients,
spikes, or digital hash on the line a good low equivalent-series-resistance (ESR) ceramic capacitor, typically
1
F, placed as close as possible to the device PVDD lead works best. Placing this decoupling capacitor close to
the TPA2051D3 is important for the efficiency of the Class-D amplifier, because any resistance or inductance in
the trace between the device and the capacitor can cause a loss in efficiency. For filtering lower-frequency noise
signals, a 4.7
F or greater capacitor placed near the audio power amplifier would also help, but it is not required
in most applications because of the high PSRR of this device.
The TPA2051D3 does not require input coupling capacitors if the design uses a differential source that is biased
within the common mode input range. If the input signal is not biased within the recommended common-mode
input range, if high pass filtering is needed, or if using a single-ended source, input coupling capacitors are
required.
The input capacitors and input resistors form a high-pass filter with the corner frequency, C, determined in
The value of the input capacitor is important to consider as it directly affects the bass (low frequency)
performance of the circuit. Speakers in wireless phones cannot usually respond well to low frequencies, so the
corner frequency can be set to block low frequencies in this application. Not using input capacitors can increase
output offset.
Equation 2 is used to solve for the input coupling capacitance. If the corner frequency is within the audio band,
the capacitors should have a tolerance of ±10% or better, because any mismatch in capacitance causes an
impedance mismatch at the corner frequency and below.
Copyright 2009, Texas Instruments Incorporated
25
Product Folder Link(s): TPA2051D3
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