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參數(shù)資料
| 型號： | LM4755TS |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | LM4755 Stereo 11W Audio Power Amplifier with Mute; Package: TO-263; No of Pins: 9 |
| 中文描述： | 11 W, 2 CHANNEL, AUDIO AMPLIFIER, PSSO9 |
| 封裝： | TO-263, 9 PIN |
| 文件頁數(shù)： | 6/24頁 |
| 文件大?。?/td> | 530K |
| 代理商： | LM4755TS |
Power Dissipation vs Output Power
10005960
Power Dissipation vs Output Power
10005961
Application Information
The LM4755 contains circuitry to pull down the bias line in-
ternally, effectively shutting down the input stage. An external
R-C should be used to adjust the timing of the pull-down. If
the bias line is pulled down too quickly, currents induced in
the internal bias resistors will cause a momentary DC voltage
to appear across the inputs of each amplifier's internal differ-
ential pair, resulting in an output DC shift towards Vsupply.
An R-C timing circuit should be used to limit the pull-down
time such that output “pops” and signal feedthroughs will be
minimized. The pull-down timing is a function of a number of
factors, including the internal mute circuitry, the voltage used
to activate the mute, the bias capacitor, the half-supply volt-
age, and internal resistances used in the half-supply genera-
tor. Table 1 shows a list of recommended values for the
external R-C.
TABLE 1. Recommended Values for Mute Circuit
V
MUTE
V
CC
Rm
Cm
5V
12V
18 k
10 F
5V
15V
18 k
10 F
5V
20V
12 k
10 F
5V
24V
12 k
10 F
5V
28V
8.2 k
10 F
5V
30V
8.2 k
10 F
CAPACITOR SELECTION AND FREQUENCY RESPONSE
With the LM4755, as in all single supply amplifiers, AC cou-
pling capacitors are used to isolate the DC voltage present at
the inputs (pins 3, 7) and outputs (pins 1, 8). As mentioned
earlier in the External Components section these capacitors
create high-pass filters with their corresponding input/output
impedances. The Typical Application Circuit shown in Fig-
ure 1 shows input and output capacitors of 0.1 F and 1,000
F respectively. At the input, with an 83 k
typical input re-
sistance, the result is a high pass 3 dB point occurring at 19
Hz. There is another high pass filter at 39.8 Hz created with
the output load resistance of 4
. Careful selection of these
components is necessary to ensure that the desired frequen-
cy response is obtained. The Frequency Response curves in
the Typical Performance Characteristics section show how
different output coupling capacitors affect the low frequency
roll-off.
OPERATING IN BRIDGE-MODE
Though designed for use as a single-ended amplifier, the
LM4755 can be used to drive a load differentially (bridge-
mode). Due to the low pin count of the package, only the non-
inverting inputs are available. An inverted signal must be
provided to one of the inputs. This can easily be done with the
use of an inexpensive op-amp configured as a standard in-
verting amplifier. An LF353 is a good low-cost choice. Care
must be taken, however, for a bridge-mode amplifier must
theoretically dissipate four times the power of a single-ended
type. The load seen by each amplifier is effectively half that
of the actual load being used, thus an amplifier designed to
drive a 4
load in single-ended mode should drive an 8 load
when operating in bridge-mode.
www.national.com
14
LM4755
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM4755TS/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 |
| LM4755TS/NOPB | 制造商:Texas Instruments 功能描述:Audio Power Amplifier IC |
| LM4755TSX | 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 |
| LM4755TSX/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 |
| LM4756 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual 7W Audio Power Amplifier w/Mute, Standby and Volume Control |
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