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參數(shù)資料
| 型號(hào)： | LM4804LQ |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Low Voltage High Power Audio Power Amplifier |
| 中文描述： | 1.9 W, 1 CHANNEL, AUDIO AMPLIFIER, QCC28 |
| 封裝： | LLP-28 |
| 文件頁(yè)數(shù)： | 12/16頁(yè) |
| 文件大?。?/td> | 820K |
| 代理商： | LM4804LQ |
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Application Information
(Continued)
A value of 50k to 100k is suggested for R
2
. Then, R
1
can be
selected using the above equation.
V
DD
SUPPLY
The Vdd supply must be between 3 to 5 volts for the
LM4804. This voltage can be bootstrapped from a much
lower input voltage by simply connecting the V
pin to
V
. In the event that the V
supply voltage is not a low
ripple voltage source (less than 200 millivolts), it may be
advisable to use an RC filter to clean it up. Excessive ripple
on V
DD
may reduce the efficiency.
SETTING THE SWITCHING FREQUENCY
The switching frequency of the oscillator is selected by
choosing an external resistor (R3) connected between V
IN
and the FREQ pin. See the graph titled "Frequency vs V
“ in
the Typical Performance Characteristics section of the data
sheet for choosing the R3 value to achieve the desired
switching frequency. A high switching frequency allows the
use of very small surface mount inductors and capacitors
and results in a very small solution size. A switching fre-
quency between 300kHz and 2MHz is recommended.
OUTPUT DIODE SELECTION
A Schottky diode should be used for the output diode. The
forward current rating of the diode should be higher than the
peak input current, and the reverse voltage rating must be
higher than the output voltage. Do not use ordinary rectifier
diodes, since slow switching speeds and long recovery times
cause the efficiency and the load regulation to suffer. Table 1
shows a list of the diode manufacturers.
LLP PACKAGE DEVICES
The LM4804 is offered in the 14 lead LLP surface mount
package to allow for increased power dissipation compared
to the MSOP-8. For details of the thermal performance as
well as mounting and soldering specifications, refer to
Ap-
plication Note AN-1187
.
RECOMMENDED PRINTED CIRCUIT BOARD LAYOUT
Figure 5 through Figure 10 show the recommended four-
layer PC board layout that is optimized for the LQ-packaged,
3V 1.7W LM4804 mono-BTL audio amplifier and its associ-
ated external components. This circuit is designed for use
with an external 3V to 4.2V supply and speakers with 4
or
higher impedance (8
nominal).
The LM4804 circuit board is easy to use. Apply between 3V
and 4.2V (equivalent to, respectfully, a discharged or a fully
charged Li-ion or NMH battery) and ground to JP2’s V
and
GND pins, respectively. Connect a speaker with an imped-
ance of 4
or greater (8
nominal) between the board’s
VO1 (-) and VO2 (+) pins. An audio signal is applied to JP1
between the V
IN
(+) and GND (-) pins.
The circuit board is configured for a gain of 20 or 26dB (VO2
-VO1 with respect to VIN). An inverting gain of -10 at VO1 is
set by Rf (200k
) versus Ri (20k
). The extra gain of 2 is a
product of the BTL output (VO2 - VO1). Gain can be modi-
fied by changing Rf’s value with respect to Ri.
TABLE 1. Suggested Manufacturers List
Inductors
Capacitors
Diodes
Coilcraft
Tel: (800) 322-2645
Fax: (708) 639-1469
Coiltronics
Tel: (407) 241-7876
Fax: (407) 241-9339
Pulse Engineering
Tel: (619) 674-8100
Fax: (619) 674-8262
Sprague/ Vishay
Tel: (207) 324-4140
Fax: (207) 324-7223
Kemet
Tel: (864) 963-6300
Fax: (864) 963-6521
Nichicon
Tel: (847) 843-7500
Fax: (847) 843-2798
Motorola
Tel: (800) 521-6274
Fax: (602) 244-6609
International Rectifier (IR)
Tel: (310) 322-3331
Fax: (310) 322-3332
General Semiconductor
Tel: (516) 847-3222
Fax: (516) 847-3150
L
www.national.com
12
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM4804LQ/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 |
| LM4804LQX | 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 |
| LM4804LQX/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 |
| LM4805 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:3V, 1W Boosted Boomer |
| LM4805_0508 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low Voltage High Power Audio Power Amplifier |
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