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PDF LM4663 Data sheet ( Hoja de datos )
| Número de pieza | LM4663 | |
| Descripción | 2 Watt Stereo Class D Audio Power Amplifier with Stereo Headphone Amplifier | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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January 2000
LM4663
2 Watt Stereo Class D Audio Power Amplifier with Stereo
Headphone Amplifier
General Description
The LM4663 is a fully integrated single supply, high effi-
ciency Class D audio power amplifier solution. The LM4663
utilizes a continuous time delta-sigma modulation technique
that lowers output noise and THD when compared to con-
ventional pulse width modulators.
The LM4663 also features a stereo headphone amplifier that
delivers 80mW into a 32Ω headset with less than 0.5% THD.
The LM4663 has two stereo inputs that can be selected to
drive either the headphone amplifier or the Class D amplifier.
All amplifiers are protected with thermal shutdown.
In standby mode, the LM4663 draws an extremely low 2µA
supply current. With a 4Ω load, the IC’s efficiency for a
250mW power level is 69%, reaching 83% at a power level
of 2W. The IC features click and pop reduction circuitry that
minimizes audible popping during device turn-on and
turn-off. The LM4663 is available in a 24-lead TSSOP pack-
age, ideal for portable and desktop computer applications.
Key Specifications
n PO at THD+N=1%
n THD+N at 1kHz at 1 Watt into 4Ω (Power
Amp)
2.1W (typ)
0.2% (typ)
n Efficiency at 2 Watt into 4Ω
n Efficiency at 250mW into 4Ω
n Total quiescent power supply current
n Total shutdown power supply current
n THD+N 1kHz, 20mW, 32Ω (Headphone)
n Single supply range
83% (typ)
69% (typ)
22mA (typ)
2µA (typ)
0.15% (typ)
4.5V to 5.5V
Features
n Delta-sigma modulator.
n Two stereo input selector.
n “Click and pop” suppression circuitry.
n Micropower shutdown mode.
n 24 lead TSSOP package (No heatsink required).
n Stereo headphone amplifier.
Applications
n Portable computers
n Desktop computers
n Multimedia Monitors
Block Diagram
Connection Diagram
TSSOP Package
DS101269-1
BOOMER™ is a trademark of National Semiconductor Corporation.
© 2000 National Semiconductor Corporation DS101269
DS101269-2
Top View
Order Number LM4663MT
See NS Package Number MTC24
(TSSOP Package)
www.national.com
1 page  
Applications Information
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 4Ω speakers and 80mW amplifiers drive 32Ω headphones.
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, VIN1 and VIN2. Connecting the INSEL pin to the positive
supply selects VIN1, whereas pulling it to ground selects
VIN2. 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 VDD to the control pins.
TABLE 1. Function selected when applying VDD or
GND to the INSEL, SD, and HPSEL control pins.
Control
Pin
Function
Apply GND
Apply VDD
INSEL
SD
10
9
VIN1 L & R
Full power
operation
VIN2 L & R
Micropower
shutdown
HPSEL
16 Deactivate Deactivate Class
headphone amps D amps and
and activate
activate
Class D amps 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 4Ω. 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.
5 www.national.com
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Hoja de datos destacado
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