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LM4663 bảng dữ liệu(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
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Giải thích chi tiết về linh kiện  2 Watt Stereo Class D Audio Power Amplifier with Stereo Headphone Amplifier
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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 32
Ω 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 4
Ω 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
P
O at THD+N=1%
2.1W (typ)
n
THD+N at 1kHz at 1 Watt into 4
Ω (Power
Amp)
0.2% (typ)
n
Efficiency at 2 Watt into 4
83% (typ)
n
Efficiency at 250mW into 4
69% (typ)
n
Total quiescent power supply current
22mA (typ)
n
Total shutdown power supply current
2µA (typ)
n
THD+N 1kHz, 20mW, 32
Ω (Headphone)
0.15% (typ)
n
Single supply range
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
BOOMERis a trademark of National Semiconductor Corporation.
DS101269-1
TSSOP Package
DS101269-2
Top View
Order Number LM4663MT
See NS Package Number MTC24
(TSSOP Package)
January 2000
© 2000 National Semiconductor Corporation
DS101269
www.national.com


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