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Microsemi Corporation - SWITCHING CLASS-D/ STEREO POWER AMPLIFIER CONTROLLER IC

Numéro de référence LX1720
Description SWITCHING CLASS-D/ STEREO POWER AMPLIFIER CONTROLLER IC
Fabricant Microsemi Corporation 
Logo Microsemi Corporation 





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LX1720 fiche technique
THE IN F I N I T E P O W E R OF IN N O VAT I O N
AudioMAXTM
LX1720
SWITCHING CLASS-D, STEREO POWER AMPLIFIER CONTROLLER IC
PRODUCTION DATA SHEET
DESCRIPTION
The LX1720 is a highly-integrated,
Switching Class-D Stereo Power Am-
plifier Controller IC with power and
size features that make it ideal for multi-
media computer applications, as well as
other applications where high fidelity
sound is required.
With input voltage ranging from 7V-
15V, the LX1720 is designed to operate
over the full 20Hz to 20kHz audio range.
Signal distortion measurements using
industry standard 1kHz signal yields THD
+ noise levels < 1% (10 watts output).
Its high efficiency (>92%) eliminates the
need for heat sinks — even while deliv-
ering more than 10WRMS across 8 ohms
per channel (20WRMS stereo) with 0.1 ohm
SO-8 power FETs.
The LX1720's output power is limited
only by external FETs and available sup-
ply voltage.
While offering breakthrough perfor-
mance capabilities for notebooks, the
LX1720 is equally attractive for multime-
dia systems or to drive full-size home
theatre speakers.
IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.
PRODUCT HIGHLIGHT
EFFICIENCY COMPARISON OF THE CLASS-D AMPLFIER
100
- Average Power Out for 20sec. approx. 512mW
- Across 8.6 Ohm Load
80
Linfinity's LX1720
Class-D Amplifier
60
40
Highly Integrated
Linear Amplifier
20
0
05
Audio sample from "Hold On Tight"
by Electric Light Orchestra
10
Seconds
15
20
KEY FEATURES
s Integrated Switching (Class-D) Stereo
Power Amplifier Controller IC
s Delivers >10WRMS Across 8/Channel
(20WRMS stereo)
s Output Power Limited Only By External
FETs And Available Supply Voltage
s Will Drive A Wide Range Of Speakers
s High Efficiency (>92%)
s Due To High Efficiency, Power FETs Do Not
Require Heatsinking
s Audio Bandwidth Of 20Hz to 20kHz
s Wide Input Voltage Range Of 7V-15V
s Low Output Signal Distortion <1%
s High Operating Frequency (350kHz) Helps
To Reduce Output Filter Size
s Compact Design Minimizes EMI / RFI
APPLICATIONS / BENEFITS
Notebook Computers:
s Replaces existing internal low power linear
amplifier with a high efficiency Class-D
amplifier
s Enables the use of virtually any external
speaker without amplification
s Precious battery life is extended
s Fully protected power topology can
withstand shorts or external speaker
failures without damage, overheating or
posing fire hazard
Desktop Computers:
s Output power capability of up to 20WRMS
per channel in an area less than 3"x3",
without using expensive heatsinks
s Greatly reduced power supply
requirements when compared to a linear
solution of same power capabilities
s Any speakers can be used including
conventional home stereo speakers
s Very light weight circuitry will not add to
the overall weight of the system
s Multimedia amplifier can be directly
incorporated on the motherboard using
surface mount components
APPLICATION NOTE AN-11
available on our web site
or call 1-800-LMI-7011
Copyright © 1999
Rev. 1.0 9/99
PACKAGE ORDER INFO
TJ (°C)
Maximum
VDD
DB
Plastic
44-pin
SSOP
0 to 70 15V LX1720-01CDB
Note: Available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX1720-01CDBT)
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1

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