fOSC = 6.6 / (ROSC " />
參數(shù)資料
型號： TPA2008D2PWP
廠商： Texas Instruments
文件頁數(shù)： 9/26頁
文件大小： 0K
描述： IC AMP AUDIO PWR 3W STER 24TSSOP
標(biāo)準(zhǔn)包裝： 60
類型： D 類
輸出類型： 2 通道（立體聲）
在某負(fù)載時(shí)最大輸出功率 x 通道數(shù)量： 3W x 2 @ 3 歐姆
電源電壓： 4.5 V ~ 5.5 V
特點(diǎn)： 消除爆音，差分輸入，短路和熱保護(hù)，關(guān)機(jī)，音量控制
安裝類型： 表面貼裝
供應(yīng)商設(shè)備封裝： 24-HTSSOP
封裝/外殼： 24-TSSOP（0.173"，4.40mm）裸露焊盤
包裝： 管件
產(chǎn)品目錄頁面： 876 (CN2011-ZH PDF)
配用： 296-18922-ND - EVAL MODULE FOR TPA2008D2
其它名稱： 296-15339-5
www.ti.com
SELECTION OF COSC AND ROSC
fOSC = 6.6 / (ROSC x COSC)
(5)
INPUT RESISTANCE
Ci
IN
Ri
Rf
Input
Signal
f
*3 dB
+
1
2p C
i
R
i
(6)
INPUT CAPACITOR, Ci
3 dB
fc
fc +
1
2p R
i
C
i
(7)
C
i +
1
2p R
i
fc
(8)
TPA2008D2
SLOS413C – JULY 2003 – REVISED MAY 2004
APPLICATION INFORMATION (continued)
The switching frequency is determined using the values of the components connected to ROSC (pin 11) and
COSC (pin 10) and may be calculated with the following equation:
The frequency may be varied from 200 kHz to 300 kHz by adjusting the values chosen for ROSC and COSC. The
recommended values are COSC = 220 pF, ROSC= 120 k for a switching frequency of 250 kHz.
Each gain setting is achieved by varying the input resistance of the amplifier, which can range from its smallest
value to over five times that value. As a result, if a single capacitor is used in the input high-pass filter, the -3 dB
or cutoff frequency also changes by over five times.
The -3-dB frequency can be calculated using equation Equation 6. See Figure 12. Note that due to process
variation, the input resistance, Ri, can change by up to 20%.
In a typical application, an input capacitor (Ci) is required to allow the amplifier to bias the input signal to the
proper dc level for optimum operation. In this case, Ci and the input resistance of the amplifier (Ri) form a
high-pass filter with the corner frequency determined in equation Equation 7.
The value of Ci is important, as it directly affects the bass (low frequency) performance of the circuit. Consider
the example where Ri is 50 k and the specification calls for a flat bass response down to 30 Hz. Equation
Equation 5 is reconfigured as equation Equation 8.
In this example, Ci is 0.1 F, so one would likely choose a value in the range of 0.1 F to 1 F. Figure 12 can be
used to determine the input impedance for a given gain and can serve to aid in the calculation of Ci.
17
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TPA2008D2PWPG4 功能描述:音頻放大器 Stereo Hi-Pwr 5-V Filter-Free 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
TPA2008D2PWPR 功能描述:音頻放大器 Stereo Hi-Pwr 5-V Filter-Free 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
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