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參數(shù)資料
| 型號： | LM4913MH |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2W Monaural, 90mW Stereo Headphone Audio Amplifier |
| 中文描述： | 0.09 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO10 |
| 封裝： | TSSOP-10 |
| 文件頁數(shù)： | 9/15頁 |
| 文件大?。?/td> | 767K |
| 代理商： | LM4913MH |
Application Information
BRIDGE (BTL) OR SINGLE-ENDED (SE)
CONFIGURATION EXPLANATION
As shown in Figure 2, the LM4913 consists of two input
multiplexers (MUX) and two power amplifiers designed to
drive loads that have a minimum impedance of 4 ohms. In
mono BTL mode, AMP1 and AMP2 drive a speaker con-
nected between their outputs. In stereo SE mode,AMP1 and
AMP2 each drive a SE load such as stereo headphones.
In mono BTL mode, R1 works with one of AMP1’s internal
62.5kW feedback resistors to set this amplifier’s gain. AMP2
operates unity gain, set by two internal 20kW resistors. In
stereo SE modes, R2 and R3 work with AMP1’s and AMP2’s
internal 62.5kW feedback resistors to set each amplifier’s
gain. The LM4913 drives a BTL load, such as a speaker,
connected between AMP1’s and AMP2’s outputs. Two SE
loads can also be connected to the LM4913’s outputs, one
driven by AMP1 and the other driven by AMP2.
When the LM4913 operates in BTL mode, AMP1’s output
serves as AMP2’s input through AMP2’s input MUX. This
results in AMP1 and AMP2 producing signals identical in
magnitude, but 180 out of phase. Taking advantage of this
phase difference, a load placed between ROUT/M+ and
LOUT/M- is driven differentially (commonly referred to as
"bridge mode"). This results in a differential, or BTL, gain of
A
V
(BTL) = -2(A
V
(SE))
A
V
(SE) = -2(62.5k
) / R
i
A
V
(BTL) = -125k
/ R
i
(1)
Bridge mode amplifiers are different from single-ended am-
plifiers that drive loads connected between a single amplifi-
er’s output and ground. At any given supply voltage, bridge
mode has a distinct advantage over the single-ended con-
figuration: its differential output doubles the voltage swing
across the load. Theoretically, this produces four times the
output power when compared to a single-ended, capacitively
coupled amplifier under the same conditions. This increase
in attainable output power assumes that an amplifier is not
current limited and that the output signal is not clipped. To
ensure minimum output signal clipping when choosing an
amplifier’s closed-loop gain, refer to the Audio Power Ampli-
fier Design section.
POWER DISSIPATION
Power dissipation is a major concern when designing a
successful single-ended or bridged amplifier. Equation (2)
states the maximum power dissipation point for a single-
ended amplifier operating at a given supply voltage and
driving a specified output load.
P
DMAX-SE
= V
DD2
/ 2
π
2
R
L
:
However, a direct consequence of the increased power de-
livered to the load by a bridge amplifier is higher internal
Single-Ended
(2)
20061799
FIGURE 2. Typical Audio Amplifier Application Circuit
L
www.national.com
9
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|---|---|
| LM4913MM | 2W Monaural, 90mW Stereo Headphone Audio Amplifier |
| LM4917 | Ground-Referenced, 95mW Stereo Headphone Amplifier |
| LM4917MT | Ground-Referenced, 95mW Stereo Headphone Amplifier |
| LM4917SD | Ground-Referenced, 95mW Stereo Headphone Amplifier |
| LM4918 | Stereo Audio Amp with AGC Control |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM4913MH/NOPB | 功能描述:IC AMP AUDIO MONO/STER 10TSSOP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:Boomer® 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:DirectDrive® 類型:H 類 輸出類型:耳機，2-通道（立體聲） 在某負載時最大輸出功率 x 通道數(shù)量:35mW x 2 @ 16 歐姆 電源電壓:1.62 V ~ 1.98 V 特點:I²C，麥克風，靜音，短路保護，音量控制 安裝類型:表面貼裝 供應商設備封裝:25-WLP（2.09x2.09） 封裝/外殼:25-WFBGA，WLCSP 包裝:帶卷 (TR) |
| LM4913MHX/NOPB | 制造商:Texas Instruments 功能描述:Audio Amp Headphone/Speaker 1-CH Mono/2-CH Stereo 2W Class-AB 10-Pin TSSOP EP T/R |
| LM4913MM | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:2W Monaural, 90mW Stereo Headphone Audio Amplifier |
| LM4914 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:1W Monaural, 85mW Stereo Headphone Audio Amplifier |
| LM4914A WAF | 制造商:Texas Instruments 功能描述: |
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