LX1722CDB MICROSEMI, LX1722CDB Datasheet

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LX1722CDB

Manufacturer Part Number
LX1722CDB
Description
Audio Amp Speaker 2-CH Stereo 60W Class-D 44-Pin SSOP
Manufacturer
MICROSEMI
Datasheet

Specifications of LX1722CDB

Package
44SSOP
Function
Speaker
Amplifier Type
Class-D
Typical Voltage Gain
60 dB
Total Harmonic Distortion Noise
0.06@1W %
Typical Psrr
70 dB
Output Signal Type
Differential
Output Type
2-Channel Stereo
Typical Gain Bandwidth Product
7 MHz
Maximum Input Bias Current
1(Typ)@15V@-20C to 70C uA
Maximum Input Offset Voltage
5(Typ)@15V@-20C to 70C mV
Maximum Load Resistance
8 Ohm
Copyright © 2001
Rev. 1.2a,2004-06-10
performance Class-D stereo controller IC
designed for high efficiency or space
constrained audio requirements such as
portable or battery operated products,
automotive amplifiers, and multi-channel
multimedia computer and video game
applications.
audio
amplifier controller offers dramatically
improved performance over Linfinity’s
previous generation amplifier products.
Enhancements
power, better SNR, lower noise floor, and
reduced THD.
power MOSFET’s and an output filter, the
LX1721/1722 is a complete Class-D audio
solution.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
The LX1721/1722 is a monolithic high
Channel 2
Channel 3
Channel
1
bandwidth
2.1 Audio Amplifier
I N T E G R A T E D
IN -
IN +
IN -
IN +
IN -
IN +
LX1722
LX1711
Configuration
Stereo
7V - 25V
Mono
CLOCK
This high frequency, full
include
Combined with output
FETs
FETs
FETs
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
switching
P R O D U C T H I G H L I G H T
Subwoofer
higher
2Ω, 4Ω, 8Ω
D E S C R I P T I O N
Left
Right
P R O D U C T S
output
power
-20 to 70
-20 to 70
T
J
Append the letters “TR” to the part number. (i.e. LX1722CDBTR)
(°C)
available to quickly evaluate the LX1721
or LX1722 stereo controller.
connect the amplifier to the power source,
audio signal, and speakers.
designs support a variety of requirements
including
subwoofers, satellite / subwoofer com-
binations and various speaker loads (2Ω,
4Ω, 8Ω). The versatile amplifier solution
can easily be adjusted for frequency
response, optimized for efficiency and
performance, or designed to minimize
PCB area and component count.
LX1721/1722 is available in a space
saving 44-pin QSOP package.
(Continued Next Page)
Output Power vs. Supply Voltage
Linfinity Microelectronics Division
A complete audio amplifier module is
P A C K A G E O R D E R I N F O
1kHz, 4Ω, THD+N=1%
Microsemi
Note: Available in Tape & Reel.
multi
7V – 15V
7V – 25V
V
Class-D Stereo Power Amplifier Controller
DD
channel
AudioMAX™
DB
Reference
systems,
Simply
LX1721CDB
LX1722CDB
The
Plastic QSOP
44-Pin
P
RODUCTION
Integrated Switching Class-D
Stereo Controller IC
Full 20Hz-20kHz Audio
Bandwidth
High Fidelity (LX1721) Or
High Power (LX1722)
Versions Available
Single Supply Operation
THD+N <0.06% Typical
(1Wrms, 1kHz, 4Ω)
Maximum Efficiency 80%-
85%
Output Power >60Wrms per
Channel (LX1722, 4Ω, 1%
THD+N)
PSRR –70dB Typical
Differential Input To Minimize
Noise Effects
Supports Multi-Channel
Systems
Complete LXE1721or
LXE1722 Amplifier Evaluation
Module Available
44-Pin QSOP Package
Multimedia Speakers
Surround Sound Game
Systems
Notebook Computers
Desktop Computers
Automotive Amplifiers And
Head units
Battery Operated Equipment
(Megaphone, Public Address
System)
Portable Audio (Boom Box)
Wireless Speakers
High Power Subwoofer
Automotive Audio Systems
Home Theatre
K E Y F E A T U R E S
A P P L I C A T I O N S
LX1721 / 1722
Page 1

Related parts for LX1722CDB

LX1722CDB Summary of contents

Page 1

... THD+N= (° - – 15V - – 25V Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1722CDBTR) Microsemi Linfinity Microelectronics Division LX1721 / 1722 P RODUCTION Integrated Switching Class-D Stereo Controller IC Full 20Hz-20kHz Audio Simply Bandwidth High Fidelity (LX1721) Or ...

Page 2

... Microsemi Linfinity Microelectronics Division LX1721 / 1722 P RODUCTION ...

Page 3

... LN- RN- RP- RP+ RN+ PGND CP PVDD NC RISN RFBK+ RFBK Microsemi Linfinity Microelectronics Division LX1721 / 1722 P RODUCTION D ESCRIPTION Left Feedback Amplifier Inverting Input Left Feedback Amplifier Non-Inverting Input Left Current Limit Sense Input Analog Supply Voltage Supply Decoupling for NFET Drivers Output Driver Supply Voltage ...

Page 4

... OH OUT +100µA OL OUT Set by Internal Resistors -100µA OH OUT +100µA OL OUT Set by Internal Resistors Set by Internal Resistors Microsemi Linfinity Microelectronics Division LX1721 / 1722 P RODUCTION < 70°C (NOTE 2). A LX1721 / 1722 Min Typ Max 20Hz - 10W 82 = 20W 85 . 450 ...

Page 5

... SOURCE N applied externally I = 3mA SINK 100mA SINK I = 3mA 5.2V SOURCE P (applied externally 100mA 5.2V SOURCE P (applied externally) Microsemi Linfinity Microelectronics Division LX1721 / 1722 P RODUCTION LX1721 / 1722 Min Typ Max 190 210 230 500 250 5.0 ± 50 ± 100 2.5 ± 25 ± 50 ...

Page 6

... Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 AudioMAX™ Class-D Stereo Power Amplifier Controller PVDD REFERENCE + 220m V - CLK CURRENT SENSE MUTE MUX MUTE IMPLIFIED LOCK IAGRAM EFT Microsemi Linfinity Microelectronics Division LX1721 / 1722 P RODUCTION 17 7 UVLO & Reference 27, Reference 36 FAULT OUTPUT 37 TIMER DRIVERS & ...

Page 7

... This keeps the frequency relatively constant while keeping the slope of the PWM ramp proportional to the voltage on the VDD pin. For pins quit operating frequencies other than 333kHz, the frequency can be PWM approximated by the following equation: Frequency Microsemi Linfinity Microelectronics Division LX1721 / 1722 P RODUCTION and C selection) ...

Page 8

... Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 AudioMAX™ Class-D Stereo Power Amplifier Controller 19. Output Power (W) 1.225 59. Output Power (W) 1.252 38.24 50 Output Power (W) Microsemi Linfinity Microelectronics Division LX1721 / 1722 P RODUCTION 2 – THD UTPUT IGURE V = 15V 1kHz 4Ω L 100 3 – THD UTPUT ...

Page 9

... Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 AudioMAX™ Class-D Stereo Power Amplifier Controller 109 100 200 Output Power (W) 5.025k 500 10k Frequency (Hz) 5.025k 500 10k Frequency (Hz) Microsemi Linfinity Microelectronics Division LX1721 / 1722 P RODUCTION 5 – THD UTPUT IGURE V = 25V 1kHz 2Ω L 300 6 – THD REQUENCY IGURE ...

Page 10

... Class-D Stereo Power Amplifier Controller 17.8875k 500 10k 20k 50k Frequency (Hz) 17.8875k 500 10k 20k 50k Frequency (Hz) .973932k 3.96192k 500 10k Frequency (Hz) Microsemi Linfinity Microelectronics Division LX1721 / 1722 P RODUCTION 8 – REQUENCY ESPONSE IGURE V = 15V 4Ω RMS 80k 9 – REQUENCY ESPONSE IGURE ...

Page 11

... .973932k 3.96192k 500 10k 20k Frequency (Hz Output Power (W) 8Ω 4Ω 2Ω 1000 10000 100000 Frequency (Hz) 15V-1,Left 15V-1,Right Microsemi Linfinity Microelectronics Division LX1721 / 1722 P RODUCTION 11 – FFT F OISE LOOR IGURE V = 25V 4Ω L 10Hz – 22kHz Bandwidth A-Weighted 12 – FFICIENCY VS UTPUT IGURE ...

Page 12

... RFBK+ 5.1/1W 23 RFBK- R14 RFBK+ RFBK- 5.1/1W R15 RISN R7 0.020/1W 5.1/1W RISN PGND YPICAL LASS TEREO WITCHING MPLIFIER Microsemi Linfinity Microelectronics Division LX1721 / 1722 P RODUCTION R16 Q1 LFBK+ 24.3K 1% C25 220pF L1 15uH R20 Q2 C29 15/1W 0.68uF/50V PGND Q3 C30 0.68uF/50V C31 0.47uF/50V L2 15uH ...

Page 13

... G 0.40 1.27 0.016 L 0° 8° 0° M 10.11 10.51 0.396 P 0.63 0.89 0.025 R 0.51 REF 0.020 REF 0. Lead Coplanarity Microsemi Linfinity Microelectronics Division LX1721 / 1722 P RODUCTION NCHES MAX 0.104 0.020 0.0125 0.706 0.299 0.012 0.050 8° 0.414 0.035 0.004 Page 13 ...

Page 14

... This document may not be modified in any way without the express written consent of Microsemi. Product processing does not necessarily include testing of all parameters. Microsemi reserves the right to change the configuration and performance of the product and to discontinue product at any time. ...

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