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LX1722 데이터시트 PDF




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부품번호 LX1722 기능
기능 Class-D Stereo Power Amplifier Controller
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LX1722 데이터시트, 핀배열, 회로
INTEGRATED PRODUCTS
AudioMAX™
LX1721 / 1722
www.DataSheet4U.com
Class-D Stereo Power Amplifier Controller
PRODUCTION
DESCRIPTION
The LX1721/1722 is a monolithic high A complete audio amplifier module is
performance Class-D stereo controller IC available to quickly evaluate the LX1721
designed for high efficiency or space or LX1722 stereo controller. Simply
constrained audio requirements such as connect the amplifier to the power source,
portable or battery operated products, audio signal, and speakers. Reference
automotive amplifiers, and multi-channel designs support a variety of requirements
multimedia computer and video game including multi channel systems,
applications. This high frequency, full subwoofers, satellite / subwoofer com-
audio bandwidth switching power binations and various speaker loads (2,
amplifier controller offers dramatically 4, 8). The versatile amplifier solution
improved performance over Linfinity’s can easily be adjusted for frequency
previous generation amplifier products. response, optimized for efficiency and
Enhancements include higher output performance, or designed to minimize
power, better SNR, lower noise floor, and PCB area and component count. The
reduced THD. Combined with output LX1721/1722 is available in a space
power MOSFET’s and an output filter, the saving 44-pin QSOP package.
LX1721/1722 is a complete Class-D audio (Continued Next Page)
solution.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
Channel
1
Channel 2
7V - 25V
IN +
IN -
LX1722
Stereo
IN +
IN -
CLOCK
PRODUCT HIGHLIGHT
FETs
Left
Output Power vs. Supply Voltage
1kHz, 4, THD+N=1%
FETs
Right
2, 4, 8
Channel 3
LX1711
Mono
IN +
IN -
FETs
Subwoofer
2.1 Audio Amplifier
Configuration
KEY FEATURES
ƒ Integrated Switching Class-D
Stereo Controller IC
ƒ Full 20Hz-20kHz Audio
Bandwidth
ƒ High Fidelity (LX1721) Or
High Power (LX1722)
Versions Available
ƒ Single Supply Operation
ƒ THD+N <0.06% Typical
(1Wrms, 1kHz, 4)
ƒ Maximum Efficiency 80%-
85%
ƒ Output Power >60Wrms per
Channel (LX1722, 4, 1%
THD+N)
ƒ PSRR –70dB Typical
ƒ Differential Input To Minimize
Noise Effects
ƒ Supports Multi-Channel
Systems
ƒ Complete LXE1721or
LXE1722 Amplifier Evaluation
Module Available
ƒ 44-Pin QSOP Package
APPLICATIONS
ƒ Multimedia Speakers
ƒ Surround Sound Game
Systems
ƒ Notebook Computers
ƒ Desktop Computers
ƒ Automotive Amplifiers And
Head units
ƒ Battery Operated Equipment
(Megaphone, Public Address
System)
ƒ Portable Audio (Boom Box)
ƒ Wireless Speakers
ƒ High Power Subwoofer
ƒ Automotive Audio Systems
ƒ Home Theatre
Copyright 2001
Rev. 1.1,2003-06-10
PACKAGE ORDER INFO
TJ (°C)
VDD
Plastic QSOP
DB 44-Pin
-20 to 70
7V – 15V
LX1721CDB
-20 to 70
7V – 25V
LX1722CDB
Note: Available in Tape & Reel.
Append the letter “T” to the part number. (i.e. LX1722CDBT)
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1




LX1722 pdf, 반도체, 판매, 대치품
INTEGRATED PRODUCTS
AudioMAX™
LX1721 / 1722
www.DataSheet4U.com
Class-D Stereo Power Amplifier Controller
PRODUCTION
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, the following specifications apply over the operating ambient temperature -20°C < TA < 70°C (NOTE 2).
Test conditions: RPWM = 34.8k, CPWM = 100pF, VDD = PVDD = 15V
Parameter
Evaluation Module (See LXE1721)
Supply Voltage
LX1721
LX1722
Power Supply Rejection Ratio
Output Power (Per Channel)
Efficiency
Total Harmonic Distortion Plus Noise
Signal-To-Noise Ratio
Oscillator Section
Oscillator Frequency
Charge Current
Discharge Current
Oscillator Peak Voltage
Oscillator Valley Voltage
Voltage Stability
Temperature Stability
Error Amplifier
Input Offset Voltage
DC Open Loop Gain
Unity Gain Bandwidth
High Output Voltage
Low Output Voltage
Input Bias Current
Input Amplifier
Stage Gain
Output Voltage, High
Output Voltage, Low
Input Impedance
Feedback Amplifier
Stage Gain
LX1721
LX1722
Input Impedance
LX1721
LX1722
Symbol
Test Conditions
LX1721 / 1722
Min Typ Max
Units
VDD
PSRR
PO
THD+N
SNR
FOSC
ICHG
IDIS
VPK
VVAL
VIO
AOL
UGBW
VOH
VOL
IIN
VOH
VOL
VIN = 15V, VRIPPLE = 1VRMS, 20Hz
to 20kHz
VIN = 15V, RL=4, THD+N=1%,
10Hz to 22kHz
VIN = 25V, RL=4, THD+N=1%,
10Hz to 22kHz
VIN = 15V, fIN = 1kHz, PO = 10W
VIN = 15V, fIN = 1kHz, PO = 20W
fIN = 1kHz, PO = 1W
fIN = 20Hz to 20kHz, PO = 1W
RL = 4, PO = 1W
7
7
(varies with VDD pin voltage)
(varies with VDD pin voltage)
(varies with VDD pin voltage)
(varies with VDD pin voltage)
VDD = 8V to 25V
TA = 0OC to 70OC
IOUT = -100µA
IOUT = +100µA
VIN = 1V to 4V
Set by Internal Resistors
IOUT = -100µA
IOUT = +100µA
3.5
3.465
3.85
-70
25
60
82
85
.06
81
450
-225
225
3.6
1.4
0.6
1.0
5
60
7
1
3.5
180
15 V
25
dB
W
.2
2
2
100
3.535
1.3
%
%
dBr
kHz
µA
µA
V
V
%
%
‘mV
dB
‘MHz
V
‘mV
µA
V/V
V
V
‘k
Set by Internal Resistors
Set by Internal Resistors
89 91
56 57
250
400
93 ‘mV/V
58 ‘mV/V
k
k
Copyright 2001
Rev. 1.1,2003-06-10
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4

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LX1722 전자부품, 판매, 대치품
INTEGRATED PRODUCTS
AudioMAX™
LX1721 / 1722
www.DataSheet4U.com
Class-D Stereo Power Amplifier Controller
PRODUCTION
APPLICATION INFORMATION
Frequency Synchronization
Two or more LX1721 / LX1722 oscillators can be configured for
synchronous operation. One unit, the master, is programmed for
the desired frequency with the RPWM and CPWM as usual.
Additional units will be slave units, and their oscillators will be
disabled by leaving the RPWM pin disconnected. The CLOCK pin
and the CPWM pin of the slave units should be tied to the CLOCK
pin and the CPWM pin of the master unit respectively. In this
configuration, the CLOCK pins of the slave units begin receiving
instead of transmitting clock pulses. Also, the CPWM pins quit
driving the PWM capacitor in the slave units. Note that for
optimum performance, all slave units should be located within a
few inches of the master unit.
Oscillator Configuration (RPWM and CPWM selection)
The oscillator is programmed by the external timing components
RPWM and CPWM. For a nominal frequency of 333kHz, RPWM and
CPWM should be set to 49.9kOhms and 100pF respectively. Note that
in order to keep the slope of the PWM ramp voltage proportional to
the supply voltage, both the ramp peak and valley voltages, and the
charge and discharge currents are proportional to the supply voltage.
This keeps the frequency relatively constant while keeping the slope
of the PWM ramp proportional to the voltage on the VDD pin. For
operating frequencies other than 333kHz, the frequency can be
approximated by the following equation:
Frequency
=
1
(0.577)(RPWM )(CPWM )
+
320ns
Copyright 2001
Rev. 1.1,2003-06-10
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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