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參數(shù)資料
| 型號： | SA58672TK |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 音頻放大器 |
| 英文描述： | 3.0 W mono class-D audio amplifier |
| 封裝： | SA58672TK<SOT650-2 (HVSON10)|<<http://www.nxp.com/packages/SOT650-2.html<1<Always Pb-free,;SA58672UK<Uncased die|<<<1<Always Pb-free,; |
| 文件頁數(shù)： | 5/27頁 |
| 文件大?。?/td> | 183K |
| 代理商： | SA58672TK |
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SA58672_4
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 04 — 8 June 2009
13 of 27
NXP Semiconductors
SA58672
3.0 W mono class-D audio amplier
11. Application information
11.1 Power supply decoupling considerations
The SA58672 is a mono class-D audio amplier that requires proper power supply
decoupling to ensure the rated performance for THD+N and power efciency. To decouple
high frequency transients, power supply spikes and digital noise on the power bus line, a
low Equivalent Series Resistance (ESR) capacitor, of typically 1
F is placed as close as
possible to the PVDD terminals of the device. It is important to place the decoupling
capacitor at the power pins of the device because any resistance or inductance in the
PCB trace between the device and the capacitor can cause a loss in efciency. Additional
decoupling using a larger capacitor, 4.7
F or greater may be done on the power supply
connection on the PCB to lter low frequency signals. Usually this is not required due to
high PSRR of the device.
11.2 Voltage gain
The SA58672 is comprised of an analog amplier stage and a comparator stage. The
output of the analog amplier stage is compared with the periodic ramp signal from the
sawtooth ramp generator. The resulting output of the comparator is a Pulse Width
Modulated (PWM) signal. The nal stage is a power NMOS and PMOS H-bridge that
converts the PWM into a high power output signal capable of driving low-impedance
loads.
(1)
11.3 Input capacitor selection
The SA58672 does not require input coupling capacitors when used with a differential
audio source that is biased from 0.5 V to VDD 0.8 V. In other words, the input signal must
be biased within the common-mode input voltage range. If high-pass ltering is required
or if it is driven using a single-ended source, input coupling capacitors are required.
The 3 dB cut-off frequency created by the input coupling capacitor and the input resistors
is calculated by Equation 2:
(2)
Using an input resistor of 150 k
, the gain is set to 2 V/V. At this gain setting, for input
capacitor values from 220 nF to 2.2
F, the 3 dB cut-off frequency may be set between
22 Hz and 220 Hz. Since the values of the input coupling capacitor and the input resistor
affects the low frequency performance of the audio amplier, it is important to consider in
the system design. Small speakers in wireless and cellular phones usually do not respond
well to low frequency signals. Their low frequency response may be only 600 Hz; typically
1 kHz. Thus, the 3 dB cut-off frequency should be increased to block the low frequency
signals to the speakers.
Gain
2 150 k
()
R
i
---------------------------
=
f
3dB
–
1
2
π R
i
×
C
i
×
------------------------------
=
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| SA58672UK | 3.0 W mono class-D audio amplifier |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SA58672TK,138 | 功能描述:音頻放大器 Audio Amp SPKR 1-CH Mono 3W ClassD 10Pin 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| SA58672TK138 | 制造商:NXP Semiconductors 功能描述:IC AUDIO AMP D 3W SON-10 |
| SA58672UK | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:3.0 W mono class-D audio amplifier |
| SA58672UK,027 | 功能描述:音頻放大器 3.W MONO 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| SA58672UK-G | 功能描述:音頻放大器 3.W MONO CLASS D AUDIO AMP 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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