參數(shù)資料
型號(hào)： TDA8933BTW/N2,512
廠商： NXP SEMICONDUCTORS
元件分類： 音頻／視頻放大
英文描述： 20.6 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO32
封裝： 6.10 MM, 0.65 MM PITCH, PLASTIC, SOT-249-1, HTSSOP-32
文件頁數(shù)： 18/42頁
文件大?。?/td> 245K
代理商： TDA8933BTW/N2,512
TDA8933B_1
NXP B.V. 2008. All rights reserved.
Preliminary data sheet
Rev. 01 — 23 October 2008
25 of 42
NXP Semiconductors
TDA8933B
Class D audio amplier
14.4 Single-ended capacitor
The SE capacitor forms a high-pass lter with the speaker impedance. This means that
the frequency response will roll off with 20 dB per decade below f3dB and a cut-off
frequency of 3 dB.
The 3 dB cut-off frequency is equal to:
(7)
Where:
f3dB = 3 dB cut-off frequency (Hz)
RL = load resistance (W)
CSE = single-ended capacitance (F); see Figure 32
Table 15 shows an overview of the required SE capacitor values in the case of a 60 Hz,
40 Hz or 20 Hz 3 dB cut-off frequency.
14.5 Gain reduction
The gain of the TDA8933B is internally xed at 30 dB for SE and 36 dB for BTL. The gain
can be reduced by a resistive voltage divider at the input (see Figure 9).
When applying a resistive divider, the total voltage gain Gv(tot) can be calculated using
(8)
Where:
Gv(tot) = total voltage gain (dB)
Gv(cl) = closed-loop voltage gain, xed at 30 dB for SE (dB)
REQ = equivalent resistance, R3 and Zi ()
Table 15.
SE capacitor values
Impedance (
)
CSE (F)
f3dB = 60 Hz
f3dB = 40 Hz
f3dB = 20 Hz
4
680
1000
2200
6
470
680
1500
8
330
470
1000
f
3dB
–
1
2
π R
L
C
SE
×
-----------------------------------
=
Fig 9.
Input conguration for reducing gain
010aaa137
100
k
470 nF
audio in
R3
R1
R2
G
vtot
()
G
vcl
()
20
R
EQ
R
EQ
R1
R2
+
()
+
------------------------------------------
log
+
=
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA8933T 功能描述:音頻放大器 2X10W BTL CLASS D AMP+VOLCTRL RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TDA8933T/N1,112 功能描述:音頻放大器 2X10W BTL CLASS D RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TDA8933T/N1,118 功能描述:音頻放大器 2X10W BTL CLASS D RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TDA8933T-T 功能描述:音頻放大器 2X10W BTL CLASS D AMP+VOLCTRL RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TDA8939 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Zero dead time Class-D 7.5 A power comparator
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