參數(shù)資料
型號： LX1711EVALKIT
英文描述： AudioMAX Products
中文描述： AudioMAX產(chǎn)品
文件頁數(shù)： 4/11頁
文件大?。?/td> 299K
代理商： LX1711EVALKIT
LXE1710 / 1711 E
VALUATION
B
OARD
U
SER
G
UIDE
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
Copyright
2000
Rev. 1.3, 2002-07-09
Part Number
Product
AudioMAX High
Fidelity Controller IC
Description
LX1710CDB
V
DD
= 7V to 15V, Switching Class-D Mono
Power Amplifier IC, 28-Pin SSOP Package.
LX1711CDB
AudioMAX High
Power Controller IC
V
DD
= 7V to 25V, Switching Class-D Mono
Power Amplifier IC, 28-Pin SSOP Package.
LXE1710
LX1710 AudioMAX
Evaluation Board
Fully Operational Mono Audio Amplifier.
25W, 4
LXE1711
LX1711 AudioMAX
Evaluation Board
Fully Operational Mono Audio Amplifier.
50W, 4
LX1710/1711 A
UDIO
MAX E
VALUATION
B
OARD
F
EATURES AND
C
IRCUIT
D
ESCRIPTION
Fully Assembled Mono Evaluation Board with
Class-D Controller IC
Improved SNR and Noise Floor Performance
Output Power of 25W typical (LX1710, 15V
DD
,
4
, 1% THD+N)
Output Power of 50W typical (LX1711, 25V
DD
,
4
, 1% THD+N)
Supports Full Audio Bandwidth
Optimized to Drive 4
Speaker Load
Terminal Block Connectors for Supply
Voltage and Speaker Connection
RCA Plug for Audio Input Signal
The AudioMAX Evaluation Amplifier Board allows the
user
to
quickly
connect
LX1710/1711 Switching Class-D Mono Controller IC.
Easy-to-connect terminal blocks and an RCA plug are
provided for interfacing to Power, Speaker, and Audio
Input connections. The single stage output filter has
been configured to drive a 4
load and support full
audio bandwidth amplification (See Audio Application
Note for LC filter design component selection,
calculations, and suggested inductor and capacitor
values for other loads). The Evaluation Board
operates from a single supply voltage.
and
evaluate
the
The Class-D Amplifier Controller IC requires a
minimal number of external components to create a
complete amplifier solution. See Evaluation Board
Schematic and Bill of Materials for circuit specifics. A
Class-D Amplifier is a “switching” amplifier that
converts a low-level, analog audio input signal into a
high power, pulse-width modulated (PWM) output.
The switching frequency (430kHz typical but can be
adjusted) is much higher than the audio bandwidth
(20Hz to 20kHz), and is easily filtered out with a
simple LC filter. The support circuitry can be
generally grouped into three areas (input circuit,
output power stage, and output filter).
I
NPUT
C
OMPENSATION
The first group is the compensation network and
control setting components. These resistors and
capacitors set up the controller operating frequency,
response characteristics, and comparator ramp
fundamental to Class-D operation.
O
UTPUT
S
TAGE
The next section is the output stage. The controller
IC generates a PWM output by controlling external
FETs connected in a full bridge configuration. The full
bridge configuration is connected between the single
supply voltage (PVDD) and ground (PGND) with the
output of the bridge driving the LC filter stage.
Because the FETs are either fully “on” or fully “off”,
Class-D topology is extremely efficient (up to 85%
typical), circuit power dissipation is minimal, and
maximum power is delivered to the speaker. The
bridge output also drives the RC low pass filter, which
provides the feedback for the control loop through the
FBK+ and FBK- inputs.
F
ILTER
S
TAGE
The single stage, second order LC filter is used to
remove the switching frequency. The frequency
response and corner frequency can be easily
adjusted for optimization of various loads. The LC
evaluation board component values have been
chosen for a 4
load. See section on LC filter design
for component selection.
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參數(shù)描述
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