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參數(shù)資料
| 型號(hào)： | LM4663MT/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2.1 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
| 封裝： | TSSOP-24 |
| 文件頁(yè)數(shù)： | 7/11頁(yè) |
| 文件大小： | 1007K |
| 代理商： | LM4663MT/NOPB |
Applications Information
SUGGESTED APPLICATION CIRCUIT
The LM4663 achieves its specified performance using the
recommended application circuit shown in Figure 1. The
circuit provides full access to the stereo 2W/channel power
amplifiers and the 80mW/channel stereo headphone ampli-
fier. The HPSELECT (headphone select ) input is controlled
by a stereo mini-plug/jack with additional control contact.
Other applications of this device may use external generated
logic signals to control this function.
CONTROL PINS
The LM4663 has three control pins: INSEL, SD, and HPSEL.
The INSEL pin is used to select between the two stereo
inputs, V
IN1 and VIN2. Connecting the INSEL pin to the
positive supply selects V
IN1, whereas pulling it to ground
selects V
IN2. Micropower shutdown operation is selected by
pulling the SD to the positive supply. Applying the positive
supply to the HPSEL pin selects the headphone amplifiers
and grounding the HPSEL pin selects the Class D amplifiers.
Table 1 is a summary of the function selected when applying
ground or V
DD to the control pins.
TABLE 1. Function selected when applying V
DD or
GND to the INSEL, SD, and HPSEL control pins.
Control
Function
Pin
Apply GND
Apply V
DD
INSEL
10
V
IN2 L& R
V
IN1 L& R
SD
9
Full power
operation
Micropower
shutdown
HPSEL
16
Deactivate
headphone amps
and activate Class
D amps
Deactivate Class
D amps and
activate
headphone amps
OUTPUT FILTERS
The LM4663’s 2W power amplifiers use a Class D switching
topology that requires a filter between the amplifier outputs
and the load. The balanced, L-C filters shown in Figure 1 use
component values recommended for a maximally flat mag-
nitude in the pass-band and a cut-off frequency of 18kHz
with a load impedance of 4
. We do not recommend omit-
ting the filter because considerable out-of-band energy is
10126903
FIGURE 1. Operating on a single 5V supply, this recommended application circuit is a complete solution with 2W
Class D amplifiers that drive 4
speakers and 80mW amplifiers drive 32 headphones.
LM4663
www.national.com
5
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM4663MTX/NOPB | 2.1 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
| LM4664ITL/NOPB | 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9 |
| LM4664ITLX/NOPB | 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9 |
| LM4665MM/NOPB | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO10 |
| LM4665MMX/NOPB | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO10 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM4663MTX | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| LM4664 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Filterless High Efficiency 1.1W Switching Audio Amplifier |
| LM4664ITL | 制造商:Texas Instruments 功能描述:AMP FILTERLESS CLASS-A 1.1W 4664 |
| LM4665 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Filterless High Efficiency 1W Switching Audio Amplifier |
| LM4665 WAF | 制造商:Texas Instruments 功能描述: |
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