900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




National Semiconductor Electronic Components Datasheet

LM48311 Datasheet

Class D Audio Power Amplifier

No Preview Available !

www.DataSheet4U.com
LM48311
June 25, 2009
Ultra-Low EMI, Filterless, 2.6W, Mono, Class D Audio
Power Amplifier with E2S
General Description
The LM48311 is a single supply, high efficiency, mono, 2.6W,
filterless switching audio amplifier. The LM48311 features
National’s Enhanced Emissions Suppression (E2S) system,
that features a unique patent-pending ultra low EMI, spread
spectrum, PWM architecture, that significantly reduces RF
emissions while preserving audio quality and efficiency. The
E2S system improves battery life, reduces external compo-
nent count, board area consumption, system cost, and sim-
plifying design.
The LM48311 is designed to meet the demands of portable
multimedia devices. Operating from a single 5V supply, the
device is capable of delivering 2.6W of continuous output
power to a 4load with less than 10% THD+N. Flexible power
supply requirements allow operation from 2.4V to 5.5V. The
LM48311 features both a spread spectrum modulation
scheme, and an advanced, patented edge rate control (ERC)
architecture that significantly reduces emissions, while main-
taining high quality audio reproduction (THD+N = 0.03%) and
high efficiency (η = 88%).
The LM48311 features high efficiency compared to conven-
tional Class AB amplifiers, and other low EMI Class D ampli-
fiers. When driving and 8speaker from a 5V supply, the
device operates with 88% efficiency at PO = 1W. The gain of
the LM48311 is internally set to 6dB, further reducing external
component count. A low power shutdown mode reduces sup-
ply current consumption to 0.01µA.
Advanced output short circuit protection with auto-recovery
prevents the device from being damaged during fault condi-
tions. Superior click and pop suppression eliminates audible
transients on power-up/down and during shutdown.
Key Specifications
■ Efficiency at 3.6V, 400mW into 8
■ Efficiency at 5V, 1W into 8
■ Quiescent Power Supply Current at 5V
■ Power Output at VDD = 5V, RL = 4Ω
THD+N 10%
THD+N 1%
■ Power Output at VDD = 5V, RL = 8Ω
THD+N 10%
THD+N 1%
■ Shutdown current
85% (typ)
88% (typ)
3.1mA
2.6W (typ)
2.1W (typ)
1.6W (typ)
1.3W (typ)
0.01μA (typ)
Features
Passes FCC Class B Radiated Emissions with 20 inches
of cable
E2S System Reduces EMI while Preserving Audio Quality
and Efficiency
Output Short Circuit Protection with Auto-Recovery
No output filter required
Internally Configured Gain (6dB)
Low power shutdown mode
Minimum external components
"Click and pop" suppression
Micro-power shutdown
Available in space-saving microSMD package
Applications
Mobile phones
PDAs
Laptops
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2009 National Semiconductor Corporation 300975
www.national.com


National Semiconductor Electronic Components Datasheet

LM48311 Datasheet

Class D Audio Power Amplifier

No Preview Available !

www.DataShTeeyt4pU.iccomal Application
FIGURE 1. Typical Audio Amplifier Application Circuit
300975a8
www.national.com
2


Part Number LM48311
Description Class D Audio Power Amplifier
Maker National Semiconductor Corporation
PDF Download

LM48311 Datasheet PDF





Similar Datasheet

1 LM4831 Multimedia Computer Audio-Chip
National Semiconductor
2 LM48310 Audio Power Amplifier
etcTI
3 LM48310 Class D Audio Power Amplifier
National Semiconductor
4 LM48311 Audio Power Amplifier
etcTI
5 LM48311 Class D Audio Power Amplifier
National Semiconductor Corporation
6 LM48312 Audio Power Amplifier
etcTI





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy