參數(shù)資料
型號(hào)： TDA8933BTW/N2,512
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 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(yè)數(shù)： 17/42頁(yè)
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
24 of 42
NXP Semiconductors
TDA8933B
Class D audio amplier
14.2 Output current limitation
The peak output current IO(max) is internally limited to a minimum value of 2 A. During
normal operation the output current should not exceed this threshold level, otherwise the
signal will be distorted. The peak output current in SE or BTL congurations can be
calculated using Equation 5 and Equation 6.
SE conguration:
(5)
BTL conguration:
(6)
Where:
VP = supply voltage VDDP1 VSSP1 (V) or VDDP2 VSSP2 (V)
RL = load resistance ()
RDSon = drain-source on-state resistance ()
Rs = series resistance output inductor ()
RESR = Equivalent Series Resistance SE capacitance ()
Example:
An 8
speaker in the BTL conguration can be used up to a supply voltage of 18 V
without running into current limiting. Current limiting (clipping) will avoid audio holes but
produces a similar distortion to voltage clipping.
14.3 Speaker conguration and impedance
For a at frequency response (second-order Butterworth lter with an output frequency of
40 kHz) it is necessary to change the low-pass lter components LLC and CLC according
to the speaker conguration and impedance. Table 14 shows the values required in
practice.
I
O max
()
0.5
V
P
×
R
L
R
DSon
R
s
R
ESR
++
+
----------------------------------------------------------
2A
≤≤
I
O max
()
V
P
R
L
2R
DSon
R
s
+
()
×
+
------------------------------------------------------
2A
≤≤
Table 14.
Filter component values
Conguration
RL ()
LLC (H)
CLC (nF)
SE
4
22
680
6
33
470
8
47
330
BTL
8
22
680
16
47
330
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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(lèi)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(lèi)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
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