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參數(shù)資料
| 型號： | LM4961LQ |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Ceramic Speaker Driver |
| 中文描述： | 1 CHANNEL, AUDIO AMPLIFIER, QCC28 |
| 封裝： | 5 X 5 MM, LLP-28 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 509K |
| 代理商： | LM4961LQ |
Application Information
(Continued)
(V
DD
) is applied to the Band-SW pin (pin 19) the amplifier is
in ringer mode. This enables the boost converter and sets
the externally configurable closed loop gain selection to
BW1. If the Band-SW pin has a logic low (GND) applied to its
terminal then the device is in receiver mode. In this mode the
boost converter is disabled and the gain selection is
switched to BW2. This allows the amplifier to be powered
directly from the battery minus the voltage drop across the
Schottky diode.
REDUCING TRANSIENT CURRENT SPIKE
Due to the quick turn-on time of the Boost Converter, a
transient supply current spike is observed on shutdown re-
lease. To reduce the rise time of the output voltage (V
), thus
reducing the value of the supply current spike, please refer
to application circuit in Figure 2. Using this configuration will
allow the user to reduce the transient supply current spike
without the Boost Converter experiencing any stability
issues.
PROPER SELECTION OF EXTERNAL COMPONENTS
Proper selection of external components in applications us-
ing integrated power amplifiers, and switching DC-DC con-
verters, is critical for optimizing device and system perfor-
mance. Consideration to component values must be used to
maximize overall system quality.
The best capacitors for use with the switching converter
portion of the LM4961 are multi-layer ceramic capacitors.
They have the lowest ESR (equivalent series resistance)
and highest resonance frequency, which makes them opti-
mum for high frequency switching converters.
When selecting a ceramic capacitor, only X5R and X7R
dielectric types should be used. Other types such as Z5U
200940A3
FIGURE 2. Transient Current Spike Reduction Configuration
L
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM4961LQ/NOPB | 功能描述:音頻放大器 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 |
| LM4961LQBD | 功能描述:音頻 IC 開發(fā)工具 LM4961LQ EVAL BOARD RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
| LM4961LQBD/NOPB | 制造商:Texas Instruments 功能描述:Evaluation Kit For Ceramic Speaker Driver |
| LM4961LQX | 功能描述:音頻放大器 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 |
| LM4961LQX/NOPB | 功能描述:音頻放大器 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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