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參數(shù)資料
| 型號： | LM4663MTX/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 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 605K |
| 代理商： | LM4663MTX/NOPB |
Applications Information
Suggested Application Circuit
The LM4663 achieves its specified performance using the
recommended application circuit shown in Figure 1. The cir-
cuit provides full access to the stereo 2W/channel power am-
plifiers and the 80mW/channel stereo headphone amplifier.
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 in-
puts, 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 magni-
tude in the pass-band and a cut-off frequency of 18kHz with
a load impedance of 4
. We do not recommend omitting the
filter because considerable out-of-band energy is present in
the Class D output waveform. This energy would be dissi-
pated in the load impedance’s resistive component, which
diminishes efficiency.
DS101269-3
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
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