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參數(shù)資料
| 型號(hào)： | LM4817MH/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.5 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO28 |
| 封裝： | 4.40 MM, TSSOP-28 |
| 文件頁數(shù)： | 11/21頁 |
| 文件大小： | 1119K |
| 代理商： | LM4817MH/NOPB |
Application Information (Continued)
Resistor value for V
UT and VLT are determined as follows:
(The application of Figure 6 used a G
T of 5 mho)
The above procedure assumes a rail-to-rail output compara-
tor. Essentially, R
2 is in parallel with R1 prior to reaching the
lower threshold, then R
2 becomes parallel with R3 for the
upper threshold. Note that the application requires rail-to-rail
input as well.
The resistor values shown in Figure 7 are the closest prac-
tical to calculated values.
Fast Start-Up
The LM4817’s LDO provides fast start-up time for better
system efficiency. The start-up speed is maintained when
using the optional noise bypass capacitor. An internal 500A
current source charges the capacitor until it reaches about
90% of its final value.
RECOMMENDED PRINTED CIRCUIT BOARD LAYOUT
Figures 8 through 10 show the recommended two-layer PC
board layout that is optimized for the 28-pin MH-packaged
LM4817 and associated components. These circuits are
designed for use with an external 5V supply and 8
(or
greater) speakers.
This circuit board is easy to use. Apply 5V and ground to the
board’s V
DD and GND pads, respectively. Connect speakers
between the board’s -OUTA and +OUTA and OUTB and
+OUTB pads. Apply the stereo input signal to the input pins
labeled "-INA" and "-INB." The stereo input signal’s ground
references are connected to the respective input channel’s
"GND" pin, adjacent to the input pins.
200781C0
FIGURE 7. Minimum Battery Detector that Disconnects
the Load Via the SHDN Pin of the LM4817
200781D2
FIGURE 8. Recommended MH board layout:
component-side silkscreen
20078145
FIGURE 9. Recommended MHPC board layout:
component-side layout
LM4817
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM4817MHX/NOPB | 功能描述:IC AMP AUDIO PWR 1.5W AB 28TSSOP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:Boomer® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:DirectDrive® 類型:D 類 輸出類型:1-通道（單聲道），帶立體聲耳機(jī) 在某負(fù)載時(shí)最大輸出功率 x 通道數(shù)量:930mW x 1 @ 8 歐姆; 40mW x 2 @ 16 歐姆 電源電壓:2.7 V ~ 5.5 V 特點(diǎn):消除爆音，差分輸入，I²C，靜音，關(guān)閉，音量控制 安裝類型:表面貼裝 供應(yīng)商設(shè)備封裝:25-WLP（2.09x2.09） 封裝/外殼:25-WFBGA，WLCSP 包裝:帶卷 (TR) 其它名稱:MAX97000EWA+T-ND |
| LM4818 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:350mW Audio Power Amplifier with Shutdown Mode |
| LM4818M | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:350mW Audio Power Amplifier with Shutdown Mode |
| LM4818M/NOPB | 功能描述:IC AMP AUDIO PWR .35W MONO 8SOIC RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:Boomer® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:DirectDrive® 類型:H 類 輸出類型:耳機(jī)，2-通道（立體聲） 在某負(fù)載時(shí)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(diǎn):I²C，麥克風(fēng)，靜音，短路保護(hù)，音量控制 安裝類型:表面貼裝 供應(yīng)商設(shè)備封裝:25-WLP（2.09x2.09） 封裝/外殼:25-WFBGA，WLCSP 包裝:帶卷 (TR) |
| LM4818MABD | 功能描述:BOARD EVALUATION LM4818MA RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估板 - 音頻放大器 系列:Boomer® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- |
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