參數(shù)資料
型號(hào)： TAS5708PHP
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻／視頻放大
英文描述： 20.2 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP48
封裝： 7 X 7 MM, GREEN, PLASTIC, HTQFP-48
文件頁(yè)數(shù)： 7/56頁(yè)
文件大?。?/td> 1104K
代理商： TAS5708PHP
100
90
80
70
60
50
40
f Frequency Hz
Crosstalk
dB
G015
20
100
1k
10k
20k
Left to Right
Right to Left
PO = 1 W
PVCC = 24 V
RL = 8
DETAILED DESCRIPTION
POWER SUPPLY
www.ti.com ........................................................................................................................................................................................... SLOS570 – DECEMBER 2008
TYPICAL CHARACTERISTICS, BTL CONFIGURATION (continued)
CROSSTALK
vs
FREQUENCY
Figure 17.
To facilitate system design, the TAS5708 needs only a 3.3-V supply in addition to the 10-V to 26-V power-stage
supply. An internal voltage regulator provides suitable voltage levels for the gate drive circuitry. Additionally, all
circuitry requiring a floating voltage supply, e.g., the high-side gate drive, is accommodated by built-in bootstrap
circuitry requiring only a few external capacitors.
In order to provide good electrical and acoustical characteristics, the PWM signal path for the output stage is
designed as identical, independent half-bridges. For this reason, each half-bridge has separate bootstrap pins
(BST_X), and power-stage supply pins (PVCC_X). The gate drive voltages (VCLAMP_AB and VCLAMP_CD) are
derived from the PVCC voltage. Special attention should be paid to placing all decoupling capacitors as close to
their associated pins as possible. In general, inductance between the power-supply pins and decoupling
capacitors must be avoided.
For a properly functioning bootstrap circuit, a small ceramic capacitor must be connected from each bootstrap pin
(BST_X) to the power-stage output pin (OUT_X). When the power-stage output is low, the bootstrap capacitor is
charged through an internal diode connected between the gate-drive regulator output pin (VCLAMP_X) and the
bootstrap pin. When the power-stage output is high, the bootstrap capacitor potential is shifted above the output
potential and thus provides a suitable voltage supply for the high-side gate driver. In an application with PWM
switching frequencies in the range from 352 kHz to 384 kHz, it is recommended to use 220-nF ceramic
capacitors, size 0603 or 0805, for the bootstrap supply. These 220-nF capacitors ensure sufficient energy
storage, even during minimal PWM duty cycles, to keep the high-side power stage FET (LDMOS) fully turned on
during the remaining part of the PWM cycle.
Special attention should be paid to the power-stage power supply; this includes component selection, PCB
placement, and routing. As indicated, each half-bridge has independent power-stage supply pins (PVCC_X). For
optimal electrical performance, EMI compliance, and system reliability, it is important that each PVCC_X pin is
decoupled with a 100-nF ceramic capacitor placed as close as possible to each supply pin.
The TAS5708 is fully protected against erroneous power-stage turnon due to parasitic gate charging.
Copyright 2008, Texas Instruments Incorporated
15
Product Folder Link(s): TAS5708
相關(guān)PDF資料
PDF描述
TAS5708PHPR 20.2 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP48
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TAS5708PHPR 功能描述:音頻放大器 20W St Closed-Loop I2S In Aud Pwr 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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TAS5709 制造商:TI 制造商全稱:Texas Instruments 功能描述:20-W STEREO DIGITAL AUDIO POWER AMPLIFIER WITH EQ AND DRC
TAS5709APHP 功能描述:音頻放大器 20W Stereo I2S Aud 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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TAS5709APHPR 功能描述:音頻放大器 20W Stereo I2S Aud 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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TAS5709EVM 功能描述:音頻 IC 開(kāi)發(fā)工具 TAS5709EVM Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V
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