LX1721CDB [ETC]
AudioMAX Products ; AudioMAX产品\n型号: | LX1721CDB |
厂家: | ETC |
描述: | AudioMAX Products
|
文件: | 总14页 (文件大小:359K) |
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
L I N F I N I T Y D I V I S I O N
PRELIMINARY
KEY FEATURES
DESCRIPTION
The LX1721/1722 is a monolithic high
A complete audio amplifier module is
ꢀ Integrated Switching Class-D
Stereo Controller IC
ꢀ Full 20Hz-20kHz Audio
Bandwidth
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
ꢀ 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
0 to 70
0 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 2000
Microsemi
Page 1
Rev. 0.1b,2001-09-19
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
L I N F I N I T Y D I V I S I O N
PRELIMINARY
THERMAL DATA
PACKAGE PIN OUT
DB
LFAOUT
CPWM
RPWM
LMUTE
LEAOUT
LEAIN
LFBK-
LFBK+
LISN
VDD
1
44
44-PIN QSSOP PACKAGE
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
50°C/W
CN
Junction Temperature Calculation: TJ = TA + (PD x θJA).
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 2000
Rev. 0.1b,2001-09-19
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
L I N F I N I T Y D I V I S I O N
PRELIMINARY
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
LISN
VDD
CN
PVDD
PGND
PWM Resistor Connection
Left Mute Input (Active High)
Left Error Amplifier Output
Left Inverting Input of Error Amplifier
5V Reference
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
LN+
LP+
LP-
Input / Output Clock for Synch Operation
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+
LN-
RN-
RP-
RP+
RN+
Left Positive Audio Input
Left Negative Audio Input
Left Input Amplifier Output
Right Positive Audio Input
Right Negative Audio Input
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
PGND
CP
Right Input Amplifier Output
Sleep Input (active low)
Output Driver High Current Ground
Supply Decoupling for PFET Drivers
SLEEP
STATUS
RMUTE
REAIN
PVDD
NC
RISN
UVLO Indicator (Open Collector Output)
Output Driver Supply Voltage
Right Mute Input (Active High)
No Connect
Right Inverting Input of Error Amplifier
Right Current Limit Sense Input
Left Feedback Amplifier Non-Inverting
Input
REAOUT
RFAOUT
RFBK+
RFBK-
Right Error Amplifier Output
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 2000
Rev. 0.1b,2001-09-19
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
L I N F I N I T Y D I V I S I O N
PRELIMINARY
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C < TA < 70°C.
Test conditions: RPWM = 34.8k, CPWM = 100pF, VDD = PVDD = 15V
LX1721 / 1722
Parameter
Symbol
Test Conditions
Units
Min
Typ
Max
Evaluation Module (See Figure 2)
Supply Voltage
LX1721
LX1722
7
7
15
25
VDD
V
V
IN = 15V, VRIPPLE = 1VRMS, 20Hz
Power Supply Rejection Ratio
PSRR
-70
25
60
dB
to 20kHz
VIN = 15V, RL=4ꢀ, THD+N=1%,
10Hz to 22kHz
Output Power (Per Channel)
PO
W
%
VIN = 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
81
dBr
Oscillator Section
Oscillator Frequency
Charge Current
Discharge Current
Oscillator Peak Voltage
Oscillator Valley Voltage
Voltage Stability
FOSC
ICHG
IDIS
VPK
VVAL
335
-110
110
3.4
1.6
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
TA = 0OC to 70OC
1.0
1.5
%
%
Temperature Stability
TA = -40OC to 125OC
Error Amplifier
Input Offset Voltage
DC Open Loop Gain
Unity Gain Bandwidth
High Output Voltage
Low Output Voltage
Input Common Mode Range
Input Bias Current
VIO
AOL
UGBW
VOH
5
60
7
‘mV
dB
‘mHz
V
V
REF –1
IOUT = -100µA
IOUT = +100µA
VOL
50
1
‘mV
IIN
VIN = 1V to VREF
µA
Input Amplifier
Stage Gain
Set by Internal Resistors
IOUT = -100µA
IOUT = +100µA
3.465
3.85
3.5
42
3.535
1.3
V/V
V
‘mV
‘kΩ
Output Voltage, High
Output Voltage, Low
Input Impedance
VOH
VOL
Copyright 2000
Rev. 0.1b,2001-09-19
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
L I N F I N I T Y D I V I S I O N
PRELIMINARY
ELECTRICAL CHARACTERISTICS (CONTINUED)
LX1721 / 1722
Typ
Parameter
Symbol
Test Conditions
Units
Min
Max
Feedback Amplifier
Stage Gain
LX1721
LX1722
Set by Internal Resistors
Set by Internal Resistors
89
56
91
57
388
93
58
‘mV/V
‘mV/V
kΩ
Input Impedance
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
5.000
± 25
2
± 50
5
10
‘mV
‘mV
‘mV
‘mV
‘mV
TA = 0OC to 70OC
Temperature Stability
TA = -40OC to 125OC
4
Line Regulation
Load Regulation
V
DD = 9V to 15V
0.5
5
IOUT = 0 to 20mA
Under voltage Lockout Section
Start Threshold Voltage
UV Lockout Hysteresis
UVLO Delay To Output Enable
Supply Current
6.5
6.5
62,500
V
V
0.5
clkcyc
SLEEP Input = 0V, TA = 25OC
Sleep Current
25
µA
SLEEP Input = 2V, VIN = 15V,
Operating Current
2.9
5.0
‘mV
No MOSFETs connected
Sleep to Output Enable
Sleep Threshold
Mute Section
62,500
1.45
clkcyc
V
1.2
1.6
1.6
1.8
Mute Threshold
1.7
V
Output Drivers for N-Channel MOSFETs
I
SINK = 3mA
30
1.5
100
2.0
‘mV
V
NFET Drivers, Low Level Voltage
NFET Drivers, High Level Voltage
VOL
VOH
ISINK = 75mA
ISOURCE = 3mA, CN = 5.2V
30
100
2.0
‘mV
V
applied externally
ISOURCE = 75mA, CN = 5.2V
applied externally
1.5
Output Drives For P-Channel MOSFETs
I
I
SINK = 3mA
SINK = 75mA
ISOURCE = 3mA, CP = 5.2V
30
1
100
1.5
‘mV
V
PFET Drivers, Low Level Voltage
VOL
VOH
30
1
100
1.5
‘mV
V
(applied externally)
PFET Drivers, High Level Voltage
ISOURCE = 75mA, CP = 5.2V
(applied externally)
Copyright 2000
Rev. 0.1b,2001-09-19
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
L I N F I N I T Y D I V I S I O N
PRELIMINARY
BLOCK DIAGRAM
10
SLEEP
25
VDD
LISN
1
4
VREF
V25
UVLO
&
PVDD
+
27
REFERENCE
5V
24 CN
220mV
Reference
-
SYNC
CLOCK 28
CLK
RPWM
CPWM
5
6
OSC
24
26
PVDD
CP
5V
CURRENT SENSE
Reference
LEAOUT 14
23 LP+
22 LN+
13
9
LEAIN
FAULT
TIMER
OUTPUT
DRIVERS
&
ERROR AMP
LAMPOUT
21 LN-
20 LP-
LOGIC
S
Q
Q
R
CLK
8
7
LIN-
MUTE
MUTE
15 LFAOUT
17 LFBK-
LIN+
MUX
INPUT AMP
16
LFBK+
2.5V
FEEDBACK AMP
11
LMUTE
2.5V
FIGURE 1 – LX1721 / 22 SIMPLIFIED BLOCK DIAGRAM (LEFT CHANNEL CIRCUIT SHOWN)
Copyright 2000
Microsemi
Page 6
Rev. 0.1b,2001-09-19
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
L I N F I N I T Y D I V I S I O N
PRELIMINARY
APPLICATION INFORMATION
Frequency Synchronization
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:
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.
1
Frequency =
(0.577)(RPWM )(CPWM ) + 320ns
Copyright 2000
Rev. 0.1b,2001-09-19
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
L I N F I N I T Y D I V I S I O N
PRELIMINARY
CHARACTERISTIC CURVES
dx=-18.20
W
dy=-0.17812 %
100
50
FIGURE 2 – THD+N VS. OUTPUT POWER
20
10
5
VIN = 15V
fIN = 1kHz
RL = 4Ω
2
1
0.5
0.24563
0.1
0.06751
0.05
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
fIN = 1kHz
RL = 4Ω
2
1
0.53924
0.2
0.1
0.0629
0.02
0.01
0.005
0.002
0.001
1.225
59.95
5
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
VIN = 15V
fIN = 1kHz
RL = 2Ω
0.5
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 2000
Rev. 0.1b,2001-09-19
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
L I N F I N I T Y D I V I S I O N
PRELIMINARY
CHARACTERISTIC CURVES (CONTINUED)
dx=108.8
W
dy=0.48800 %
100
50
FIGURE 5 – THD+N VS. OUTPUT POWER
20
10
5
2
1
VIN = 25V
fIN = 1kHz
RL = 2Ω
0.53924
0.2
0.1
0.05123
0.02
0.01
0.005
0.002
0.001
1.136
109.9
1
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
VIN = 15V
RL = 4Ω
0.5
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 2000
Rev. 0.1b,2001-09-19
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
L I N F I N I T Y D I V I S I O N
PRELIMINARY
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
VIN = 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
VIN = 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 2000
Rev. 0.1b,2001-09-19
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
L I N F I N I T Y D I V I S I O N
PRELIMINARY
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
VIN = 25V
RL = 4Ω
10Hz – 22kHz Bandwidth
A-Weighted
9.1
-96.079
10
-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
fIN = 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 2000
Microsemi
Page 11
Rev. 0.1b,2001-09-19
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
L I N F I N I T Y D I V I S I O N
PRELIMINARY
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
0.020/1W
25V
R9
PGND
0.1uF/25V
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
LFBK-
C15
5.1/1W
C31
LFAOUT
CPWM
RPWM
_LMUTE
LEAOUT
LEAIN
VREF
CLOCK
GND
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 2000
Microsemi
Page 12
Rev. 0.1b,2001-09-19
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
L I N F I N I T Y D I V I S I O N
PRELIMINARY
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
* L C
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 2000
Rev. 0.1b,2001-09-19
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
L I N F I N I T Y D I V I S I O N
PRELIMINARY
NOTES
Preliminary Data – Information contained in this document is pre-production data and is
proprietary to LinFinity. It may not be modified in any way without the express written
consent of LinFinity. Product referred to herein is offered in sample form only and
LinFinity reserves the right to change or discontinue this proposed product at any time.
Copyright 2000
Microsemi
Page 14
Rev. 0.1b,2001-09-19
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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