LX1721CDBT [MICROSEMI]
Audio Amplifier, 25W, 2 Channel(s), 1 Func, PDSO44, PLASTIC, QSOP-44;
| 型号： | LX1721CDBT |
| 厂家： | 
Microsemi |
| 描述： | Audio Amplifier, 25W, 2 Channel(s), 1 Func, PDSO44, PLASTIC, QSOP-44 放大器 功率放大器 控制器 |
| 文件： | 总14页 (文件大小：360K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AudioMAX™
LX1721 / 1722
Class-D Stereo Power Amplifier Controller
I N T E G R A T E D P R O D U C T S
PRODUCTION
KEY FEATURES
DESCRIPTION
The LX1721/1722 is a monolithic high
A complete audio amplifier module is
Integrated Switching Class-D
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
Stereo Controller IC
Full 20Hz-20kHz Audio
Bandwidth
High Fidelity (LX1721) Or
High Power (LX1722)
Versions Available
multimedia computer and video game including
multi
channel
systems,
Single Supply Operation
THD+N <0.06% Typical
(1Wrms, 1kHz, 4Ω)
applications. This high frequency, full subwoofers, satellite / subwoofer com-
audio bandwidth switching power binations and various speaker loads (2Ω,
amplifier controller offers dramatically 4Ω, 8Ω). 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.
Maximum Efficiency 80%-
85%
Output Power >60Wrms per
Channel (LX1722, 4Ω, 1%
THD+N)
PSRR –70dB Typical
Differential Input To Minimize
Noise Effects
(Continued Next Page)
LX1721/1722 is a complete Class-D audio
Supports Multi-Channel
Systems
solution.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
Complete LXE1721or
LXE1722 Amplifier Evaluation
Module Available
PRODUCT HIGHLIGHT
44-Pin QSOP Package
7V - 25V
Channel
Output Power vs. Supply Voltage
1
APPLICATIONS
IN +
IN -
FETs
FETs
Left
1kHz, 4Ω, THD+N=1%
Multimedia Speakers
Surround Sound Game
Systems
LX1722
Stereo
IN +
IN -
Channel 2
Right
Notebook Computers
Desktop Computers
Automotive Amplifiers And
Head units
2Ω, 4Ω, 8Ω
CLOCK
LX1711
Battery Operated Equipment
(Megaphone, Public Address
System)
FETs
Channel 3
Mono
IN +
IN -
Subwoofer
Portable Audio (Boom Box)
Wireless Speakers
High Power Subwoofer
Automotive Audio Systems
Home Theatre
2.1 Audio Amplifier
Configuration
PACKAGE ORDER INFO
Plastic QSOP
44-Pin
VDD
TJ (°C)
DB
-20 to 70
-20 to 70
7V – 15V
LX1721CDB
LX1722CDB
7V – 25V
Note: Available in Tape & Reel.
Append the letter “T” to the part number. (i.e. LX1722CDBT)
Copyright 2001
Microsemi
Page 1
Rev. 1.1,2003-06-10
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
AudioMAX™
LX1721 / 1722
Class-D Stereo Power Amplifier Controller
I N T E G R A T E D P R O D U C T S
PRODUCTION
THERMAL DATA
PACKAGE PIN OUT
DB
LFAOUT
CPWM
RPWM
LMUTE
LEAOUT
LEAIN
1
44
LFBK-
LFBK+
LISN
VDD
44-PIN QSSOP PACKAGE
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
50°C/W
CN
Junction Temperature Calculation: T = T + (P x θ ).
JA
J
A
D
PVDD
PGND
LN+
VREF
The θJA numbers are guidelines for the thermal performance of the device/pc-board
CLOCK
GND
system. All of the above assume no ambient airflow.
LP+
V25
LIN+
LP-
LN-
LIN-
RN-
LAMPOUT
RIN+
RP-
RP+
RN+
PGND
CP
RIN-
RAMPOUT
SLEEP
STATUS
RMUTE
REAIN
PVDD
NC
RISN
RFBK+
RFBK-
REAOUT
RFAOUT
22
23
DB PACKAGE
(Top View)
DESCRIPTION (CONTINUTED)
The stereo output controller is available in either an
LX1722 high power version (>65Wrms, 4Ω) with a supply
voltage range of 7V-25V or an LX1721 high fidelity
version (better SNR performance) with a supply voltage
range of 7V-15V. The current rating of the external
MOSFET’s, the available supply voltage, and speaker load
primarily limits the maximum output power. The amplifier
provides high fidelity performance and is designed to
operate over the full 20Hz to 20kHz audio band. Signal
distortion measurements yield.
THD+N levels of 0.06%(1kHz, 1Wrms). Efficiency is
greater than 80% typical, which eliminates the need for
heatsinks in most applications. The AudioMAX™ solution
requires a single supply voltage, simplifying input power
requirements where a dual supply may not be available. To
minimize potential environmental noise issues and ease the
integration of the amplifier into a variety of applications,
features such as a balanced/differential audio input and a high
power supply rejection ratio help reduce the effects of noise
from the audio signal or power supply.
Copyright 2001
Rev. 1.1,2003-06-10
Microsemi
Page 2
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
AudioMAX™
LX1721 / 1722
Class-D Stereo Power Amplifier Controller
I N T E G R A T E D P R O D U C T S
PRODUCTION
FUNCTIONAL PIN DESCRIPTION
PIN NAME
LFAOUT
CPWM
DESCRIPTION
Left Feedback Amplifier Output
PWM Capacitor Connection
PIN NAME
LFBK-
DESCRIPTION
Left Feedback Amplifier Inverting Input
Left Feedback Amplifier Non-Inverting
Input
LFBK+
RPWM
LMUTE
LEAOUT
LEAIN
PWM Resistor Connection
Left Mute Input (Active High)
Left Error Amplifier Output
Left Inverting Input of Error Amplifier
5V Reference
LISN
VDD
CN
PVDD
PGND
Left Current Limit Sense Input
Analog Supply Voltage
Supply Decoupling for NFET Drivers
Output Driver Supply Voltage
Output Driver High Current Ground
Left Drive for NFET on Positive Half of
Bridge
VREF
CLOCK
GND
Input / Output Clock for Synch Operation
LN+
LP+
LP-
Left Drive for PFET on Positive Half of
Bridge
Low Current Ground
Left Drive for PFET on Negative Half of
Bridge
V25
2.5V Reference
Left Drive for NFET on Negative Half of
Bridge
LIN+
Left Positive Audio Input
Left Negative Audio Input
Left Input Amplifier Output
Right Positive Audio Input
Right Negative Audio Input
LN-
RN-
RP-
RP+
RN+
Right Drive for NFET on Negative Half of
Bridge
LIN-
Right Drive for PFET on Negative Half of
Bridge
LAMPOUT
RIN+
Right Drive for PFET on Positive Half of
Bridge
Right Drive for NFET on Positive Half of
Bridge
RIN-
RAMPOUT
Right Input Amplifier Output
Sleep Input (active low)
PGND
CP
PVDD
NC
Output Driver High Current Ground
Supply Decoupling for PFET Drivers
SLEEP
STATUS
RMUTE
REAIN
UVLO Indicator (Open Collector Output)
Output Driver Supply Voltage
Right Mute Input (Active High)
No Connect
Right Inverting Input of Error Amplifier
RISN
Right Current Limit Sense Input
Left Feedback Amplifier Non-Inverting
Input
REAOUT
RFAOUT
Right Error Amplifier Output
RFBK+
RFBK-
Right Feedback Amplifier Output
Right Feedback Amplifier Inverting Input
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (PVDD, VDD)............................................................................................................................. -0.3V to 30V
, STATUS, R/LFBK+, R/LFBK- .................................................................................................-0.3V to VDD +0.3V
SLEEP
R/LISN .........................................................................................................................................PVDD –2 to PVDD to +0.3V
RPWM, CPWM, R/LMUTE................................................................................................................... -0.3V to VREF +0.3V
R/LIN+, R/LIN-, R/LAMPOUT.............................................................................................................. -0.3V to VREF +0.3V
R/LEAIN, R/LEAOUT, R/LFAOUT..................................................................................................... -0.3V to VREF + 0.3V
CLOCK ........................................................................................................................................................-0.3V to CN +0.3V
Operating Junction Temperature Plastic........................................................................................................................... 125°C
Storage Temperature Range ...............................................................................................................................-65°C to 150°C
Lead Temperature (Soldering, 10 seconds)...................................................................................................................... 300°C
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into negative out of the
specified terminal.
Copyright 2001
Rev. 1.1,2003-06-10
Microsemi
Page 3
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
AudioMAX™
LX1721 / 1722
Class-D Stereo Power Amplifier Controller
I N T E G R A T E D P R O D U C T S
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
LX1721 / 1722
Parameter
Symbol
Test Conditions
Units
Min
Typ
Max
Evaluation Module (See LXE1721)
Supply Voltage
LX1721
LX1722
7
7
15
25
VDD
V
VIN = 15V, VRIPPLE = 1VRMS, 20Hz
to 20kHz
Power Supply Rejection Ratio
PSRR
-70
25
60
dB
VIN = 15V, RL=4ꢀ, THD+N=1%,
10Hz to 22kHz
Output Power (Per Channel)
PO
W
%
V
IN = 25V, RL=4ꢀ, 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 = 4Ω, PO = 1W
82
85
.06
Efficiency
Total Harmonic Distortion Plus Noise
THD+N
SNR
%
.2
Signal-To-Noise Ratio
Oscillator Section
Oscillator Frequency
Charge Current
Discharge Current
Oscillator Peak Voltage
Oscillator Valley Voltage
Voltage Stability
81
dBr
FOSC
ICHG
IDIS
VPK
VVAL
450
-225
225
3.6
1.4
0.6
kHz
µA
µA
V
V
%
(varies with VDD pin voltage)
(varies with VDD pin voltage)
(varies with VDD pin voltage)
(varies with VDD pin voltage)
VDD = 8V to 25V
2
2
Temperature Stability
Error Amplifier
TA = 0OC to 70OC
1.0
%
Input Offset Voltage
DC Open Loop Gain
Unity Gain Bandwidth
High Output Voltage
Low Output Voltage
Input Bias Current
Input Amplifier
VIO
AOL
UGBW
VOH
VOL
IIN
5
60
7
‘mV
dB
‘MHz
V
‘mV
µA
3.5
IOUT = -100µA
IOUT = +100µA
VIN = 1V to 4V
100
1
Stage Gain
Set by Internal Resistors
IOUT = -100µA
IOUT = +100µA
3.465
3.85
3.5
3.535
1.3
V/V
V
V
Output Voltage, High
Output Voltage, Low
Input Impedance
VOH
VOL
180
‘kΩ
Feedback Amplifier
Stage Gain
LX1721
LX1722
LX1721
LX1722
Set by Internal Resistors
Set by Internal Resistors
89
56
91
57
93
58
‘mV/V
‘mV/V
kΩ
Input Impedance
250
400
kΩ
Copyright 2001
Rev. 1.1,2003-06-10
Microsemi
Page 4
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
AudioMAX™
LX1721 / 1722
Class-D Stereo Power Amplifier Controller
I N T E G R A T E D P R O D U C T S
PRODUCTION
ELECTRICAL CHARACTERISTICS (CONTINUED)
LX1721 / 1722
Typ
Parameter
Symbol
Test Conditions
Units
Min
Max
Current Limit Comparator
Voltage Sense Threshold
Blanking Pulse Delay
Response Time
190
210
500
250
230
mV
‘ns
‘ns
Excluding blanking pulse
IUM Pulses required to Current Limit
4
2
4
2
4
2
‘cycles
‘cycles
Latch
Consecutive Clear Pulses required to
reset IUM counter
Reference Voltage Section
Initial Accuracy
Voltage Stability
Initial Accuracy
Voltage Stability
Temperature Stability
Line Regulation
(VREF)
(VREF)
(V25)
5.0
± 50
2.5
± 25
2
± 100
‘mV
(V25)
± 50
5
mV
‘mV
‘mV
‘mV
TA = 0OC to 70OC
VDD = 9V to 15V
IOUT = 0 to 10mA
0.5
5
Load Regulation
Under Voltage Lockout Section
Start Threshold Voltage
UV Lockout Hysteresis
UVLO Delay To Output Enable
Supply Current
6
250
62,500
V
mV
clkcyc
SLEEP Input = 0V, TA = 25OC
Sleep Current
30
8
µA
SLEEP Input = 2V, VIN = 15V,
Operating Current
11
‘mA
No MOSFETs connected
Sleep to Output Enable
Sleep Threshold
62,500
1.6
clkcyc
V
1.45
1.2
1.75
1.5
Mute Section
Mute Threshold
1.35
V
Output Drivers For N-Channel MOSFETs
ISINK = 3mA
ISINK = 100mA
30
0.3
100
1.0
‘mV
V
NFET Drivers, Low Level Voltage
NFET Drivers, High Level Voltage
VOL
VOH
ISOURCE = 3mA, CN = 5.2V
30
100
1.0
‘mV
V
applied externally
I
SOURCE = 100mA, CN = 5.2V
0.3
applied externally
Output Drives For P-Channel MOSFETs
ISINK = 3mA
30
0.5
100
1.0
‘mV
V
PFET Drivers, Low Level Voltage
VOL
VOH
I
SINK = 100mA
ISOURCE = 3mA, CP = 5.2V
30
100
‘mV
(applied externally)
PFET Drivers, High Level Voltage
ISOURCE = 100mA, CP = 5.2V
(applied externally)
0.5
1.0
V
Note 2: The LX1721 / 22CDB is guaranteed to meet performance specifications from 0° to 70°C. Specifications over the -20° to 0°C operation temperature
range are assured by design, characterization, and statistical process control.
Copyright 2001
Rev. 1.1,2003-06-10
Microsemi
Page 5
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
AudioMAX™
LX1721 / 1722
Class-D Stereo Power Amplifier Controller
I N T E G R A T E D P R O D U C T S
PRODUCTION
BLOCK DIAGRAM
17 SLEEP
VDD 41
7
VREF
V25
UVLO
&
REFERENCE
PVDD
+
LISN 42
10
5V
Reference
40 CN
220mV
-
SYNC
CLOCK
8
3
2
CLK
RPWM
CPWM
OSC
27,39 PVDD
28 CP
5V
Reference
CURRENT SENSE
LEAOUT
LEAIN
5
6
36 LP+
37 LN+
FAULT
TIMER
OUTPUT
DRIVERS
&
ERROR AMP
LAMPOUT 13
LOGIC
34 LN-
S
Q
Q
R
35
1
LP-
CLK
LIN- 12
LIN+ 11
MUTE
MUTE
LFAOUT
MUX
INPUT AMP
44
LFBK-
43 LFBK+
2.5V
FEEDBACK AMP
LMUTE
4
2.5V
FIGURE 1 – LX1721 / 22 SIMPLIFIED BLOCK DIAGRAM (LEFT CHANNEL CIRCUIT SHOWN)
Copyright 2001
Microsemi
Page 6
Rev. 1.1,2003-06-10
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
AudioMAX™
LX1721 / 1722
Class-D Stereo Power Amplifier Controller
I N T E G R A T E D P R O D U C T S
PRODUCTION
APPLICATION INFORMATION
Frequency Synchronization
Oscillator Configuration (RPWM and CPWM selection)
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.
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:
1
Frequency =
(0.577)(RPWM )(CPWM ) + 320ns
Copyright 2001
Rev. 1.1,2003-06-10
Microsemi
Page 7
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
AudioMAX™
LX1721 / 1722
Class-D Stereo Power Amplifier Controller
I N T E G R A T E D P R O D U C T S
PRODUCTION
CHARACTERISTIC CURVES
dx=-18.20
W
dy=-0.17812 %
100
50
FIGURE 2 – THD+N VS. OUTPUT POWER
20
10
5
V
IN = 15V
2
1
fIN = 1kHz
0.5
RL = 4Ω
0.24563
0.1
0.06751
005
0.02
0.01
0.005
0.002
0.001
.9161
19.12
100m
200m
500m
2
5
10
50
100
Output Power (W)
dx=58.73
W
dy=0.47633 %
100
50
FIGURE 3 – THD+N VS. OUTPUT POWER
20
10
5
VIN = 25V
2
1
f
IN = 1kHz
0.53924
RL = 4Ω
0.2
0.1
0.0629
0.02
0.01
0.005
0.002
0.001
1.225
59.95
50
100m
200m
500m
1
2
Output Power (W)
5
10
20
100
dx=-36.99
W
dy=-0.22386 %
100
50
FIGURE 4 – THD+N VS. OUTPUT POWER
20
10
5
2
1
V
IN = 15V
IN = 1kHz
RL = 2Ω
0.5
f
0.26783
0.2
0.1
0.05
0.04397
0.02
0.01
0.005
0.002
0.001
1.252
38.24
100m
200m
500m
1
2
5
10
20
50
100
Output Power (W)
Copyright 2001
Rev. 1.1,2003-06-10
Microsemi
Page 8
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
AudioMAX™
LX1721 / 1722
Class-D Stereo Power Amplifier Controller
I N T E G R A T E D P R O D U C T S
PRODUCTION
CHARACTERISTIC CURVES (CONTINUED)
dx=108.8
W
dy=0.48800 %
100
50
FIGURE 5 – THD+N VS. OUTPUT POWER
20
10
5
2
1
V
IN = 25V
0.53924
f
IN = 1kHz
0.2
0.1
RL = 2Ω
0.05123
0.02
0.01
0.005
0.002
0.001
1.136
109.9
100m
200m
500m
2
5
10
20
50
200 300
Output Power (W)
dx=-4.8988 kHz
dy=-0.17080 %
100
50
FIGURE 6 – THD+N VS. FREQUENCY
20
10
5
2
1
V
IN = 15V
0.5
RL = 4Ω
0.2
0.19402
PO = 1WRMS
0.1
0.05
0.02322
0.01
0.005
0.002
0.001
126.2
100
5.025k
20
50
200
500
1k
2k
10k
20k
Frequency (Hz)
dx=-4.8988 kHz
dy=-0.11937 %
100
50
FIGURE 7 – THD+N VS. FREQUENCY
20
10
5
2
1
VIN = 25V
RL = 4Ω
0.5
0.2
PO = 1WRMS
0.1798
0.1
0.06044
0.02
0.01
0.005
0.002
0.001
126.2
100
5.025k
20
50
200
500
1k
2k
10k
20k
Frequency (Hz)
Copyright 2001
Rev. 1.1,2003-06-10
Microsemi
Page 9
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
AudioMAX™
LX1721 / 1722
Class-D Stereo Power Amplifier Controller
I N T E G R A T E D P R O D U C T S
PRODUCTION
CHARACTERISTIC CURVES (CONTINUED)
dx=-17.869 kHz
dy=-0.155 dB
+10
+8
FIGURE 8 – FREQUENCY RESPONSE
+6
+4
+2
+0
VIN = 15V
RL = 4Ω
-1.119
PO = 1WRMS
-2
-4
-6
-8
-10
18.2
17.8875k
10
50
100
200
500
1k
2k
5k
10k
50k 80k
Frequency (Hz)
dx=-17.869 kHz
dy=+0.170 dB
+10
+8
+6
+4
+2
+0
FIGURE 9 – FREQUENCY RESPONSE
V
IN = 25V
RL = 4Ω
PO = 1WRMS
-1.436
-4
-6
-8
-10
18.2
17.8875k
10
50
100
200
500
1k
2k
5k
10k
50k 80k
Frequency (Hz)
dx=-2.9880 kHz
dy=+3.205 dB
+10
FIGURE 10 – NOISE FLOOR FFT
+0
-10
-20
-30
-40
-50
-60
-70
-80
-90
V
IN = 15V
RL = 4Ω
10Hz – 22kHz Bandwidth
A-weighted
-94.916
-98.12
-110
-120
-130
-140
-150
.973932k
3.96192k
k
20
50
100
200
500
2k
10k
20k
Frequency (Hz)
Copyright 2001
Rev. 1.1,2003-06-10
Microsemi
Page 10
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
AudioMAX™
LX1721 / 1722
Class-D Stereo Power Amplifier Controller
I N T E G R A T E D P R O D U C T S
PRODUCTION
CHARACTERISTIC CURVES (CONTINUED)
dx=-2.9880 kHz
dy=-1.969 dB
+10
+0
FIGURE 11 – NOISE FLOOR FFT
-10
-20
-30
-40
-50
-60
-70
-80
-90
V
IN = 25V
RL = 4Ω
10Hz – 22kHz Bandwidth
A-Weighted
9.
-96.079
-110
-120
-130
-140
-150
.973932k
3.96192k
k
20
50
100
200
500
2k
10k
20k
Frequency (Hz)
FIGURE 12 – EFFICIENCY VS. OUTPUT
90%
85%
80%
75%
70%
65%
60%
55%
50%
45%
POWER
VIN = 15V
f
IN = 1kHz
0
5
10
15
20
25
30
Output Power (W)
8ꢀ 4ꢀ
2ꢀ
FIGURE 13 – POWER SUPPLY REJECTION
Power Supply Rejection Ratio (PSRR)
RATIO (PSSR)
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
PO = 1WRMS
RL = 4Ω
-100
10
100
1000
10000
100000
Frequency (Hz)
15V+1,Left
15V+1,Right
15V-1,Left
15V-1,Right
Copyright 2001
Microsemi
Page 11
Rev. 1.1,2003-06-10
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
AudioMAX™
LX1721 / 1722
Class-D Stereo Power Amplifier Controller
I N T E G R A T E D P R O D U C T S
PRODUCTION
APPLICATION
LISN
R16
Q1
LFBK+
R8
24.3K 1%
C25
220pF
5.1/1W
JP1
L1
Vcc
Vcc
Vcc
Vcc Vcc
2
OUTL+
1
C1
PGND
R6
LISN
+
1000µF
Teminal 2
C2
0.1uF/25V
0.020/1W
25V
R9
PGND
15uH
R20
Q2
C29
15/1W
0.68uF/50V
5.1/1W
LFBK-
LFBK+
PGND
Q3
R10
U1
Vcc
R1 10k
C30
0.68uF/50V
1
2
44
C15
5.1/1W
C31
LFAOUT
CPWM
RPWM
_LMUTE
LEAOUT
LEAIN
VREF
CLOCK
GND
LFBK-
0.47uF/50V
C7 100pF
10uF/25V
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
C16
+
LFBK+
LISN
VDD
CN
L2
0.1uF/25V
PGND
3
OUTL-
C9 18pF
R5 34.8k 1%
C10 150pF
4
C17 4.7uF/25V,TANT
Vcc
15uH
R17
5
R11
C18
LFBK-
R2 56.2k 1%
6
47uF/25V
+
PVDD
PGND
LN+
C19
0.1uF/25V
PGND
7
Q4
24.3K 1%
C26
220pF
5.1/1W
LN+
C13 1uF/10V,TANT
C14 0.1uF/25V
8
LP+
LP-
9
LP+
10
11
12
13
14
15
16
17
18
19
20
21
22
V25
LP-
C3 0.47uF
LIN+
LN-
LIN+
LIN-
LIN+
LN-
RN-
RP-
RP+
RN+
LIN-
LIN-
RN-
R18
C4 0.47uF
LAMPOUT
RIN+
RP-
C5 0.47uF
RIN+
Q5
RFBK-
RIN+
RIN-
RP+
R12
RIN-
C6 0.47uF
24.3K 1%
C27
RIN-
RN+
220pF
PGND
RAMPOUT
SLEEP
STATUS
_RMUTE
REAIN
PGND
CP
C20 4.7uF/25V,TANT
5.1/1W
SLEEP
_MUTE
L3
C21
47uF/25V
OUTR-
PVDD
NC
C22
0.1uF/25V
+
R13
15uH
Vcc
RISN
RFBK+
RFBK-
R4 56.2k 1%
C11 18pF
C12150pF
R21
Q6
C32
15/1W
REAOUT
RFAOUT
0.68uF/50V
5.1/1W
PGND
LX1721-01CDB
R3 10k
Q7
R14
RFBK+
RFBK-
C33
0.68uF/50V
5.1/1W
C34
0.47uF/50V
L4
OUTR+
Vcc
15uH
R19
Vcc
R15
RFBK+
RISN
RISN
R7
0.020/1W
Q8
24.3K 1%
C28
220pF
5.1/1W
GND
PGND
FIGURE 14 – TYPICAL CLASS-D STEREO SWITCHING AMPLIFIER CIRCUIT APPLICATION
Copyright 2001
Microsemi
Page 12
Rev. 1.1,2003-06-10
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
AudioMAX™
LX1721 / 1722
Class-D Stereo Power Amplifier Controller
I N T E G R A T E D P R O D U C T S
PRODUCTION
MECHANICAL DIMINSIONS
44-Pin Quarter Size Outline Package (QSOP)
DB
MILLIMETERS
INCHES
MIN
Dim
44
23
MIN
2.44
0.28
0.23
17.73
7.40
MAX
2.64
0.51
0.32
17.93
7.60
MAX
0.104
0.020
0.0125
0.706
0.299
A
B
C
D
E
F
G
L
M
P
R
Z D
*LC
0.096
0.011
0.091
0.698
0.291
R
E
P
0.80 BSC
0.0315 BSC
0.10
0.40
0°
0.30
1.27
8°
0.004
0.016
0°
0.012
0.050
8°
1
22
10.11
0.63
10.51
0.89
0.396
0.025
0.414
0.035
B
F
ZD
0.51 REF
0.033 REF
-
0.10
-
0.004
D
E
* Lead Coplanarity
A
C
G
L
M
Note: Dimensions do not include mold flash or protrusions; these shall not exceed 0.15mm (.006”) on any side. Lead dimension shall not include
solder coverage.
Copyright 2001
Rev. 1.1,2003-06-10
Microsemi
Page 13
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
AudioMAX™
LX1721 / 1722
Class-D Stereo Power Amplifier Controller
I N T E G R A T E D P R O D U C T S
PRODUCTION
NOTES
PRODUCTION DATA – Information contained in this document is proprietary to Microsemi and
is current as of publication date. 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.
Copyright 2001
Microsemi
Page 14
Rev. 1.1,2003-06-10
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
相关型号：
LX1732CDUTR
1A SWITCHING REGULATOR, 135kHz SWITCHING FREQ-MAX, PDSO8, LEAD FREE, PLASTIC, MSOP-8
MICROSEMI
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