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LX1720-01CDBT [MICROSEMI]

Dual Audio Amplifier ; 双路音频放大器\n
LX1720-01CDBT
型号： LX1720-01CDBT
厂家： Microsemi    Microsemi
描述：

Dual Audio Amplifier
双路音频放大器\n

消费电路 音频放大器 视频放大器
文件： 总6页 (文件大小：177K)
中文：  中文翻译
下载：  下载PDF数据表文档文件
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AudioMAXTM  
LX1720  
SWITCHING CLASS-D, STEREO POWER AMPLIFIER CONTROLLER IC  
T H E I N F I N I T E P O W E R O F I N N O V A T I O N  
P R O D U C T I O N D A T A S H E E T  
DESCRIPTION  
KEY FEATURES  
■ Integrated Switching (Class-D) Stereo  
The LX1720 is a highly-integrated,  
Switching Class-D Stereo Power Am-  
plifier Controller IC with power and  
size features that make it ideal for multi-  
media computer applications, as well as  
other applications where high fidelity  
sound is required.  
With input voltage ranging from 7V-  
15V, the LX1720 is designed to operate  
over the full 20Hz to 20kHz audio range.  
Signal distortion measurements using  
industry standard 1kHz signal yields THD  
+ noise levels < 1% (10 watts output).  
Its high efficiency (>92%) eliminates the  
need for heat sinks — even while deliv-  
ering more than 10WRMS across 8 ohms  
per channel (20WRMS stereo) with 0.1 ohm  
SO-8 power FETs.  
The LX1720's output power is limited  
only by external FETs and available sup-  
ply voltage.  
While offering breakthrough perfor-  
mance capabilities for notebooks, the  
LX1720 is equally attractive for multime-  
dia systems or to drive full-size home  
theatre speakers.  
Power Amplifier Controller IC  
■ Delivers >10WRMS Across 8Ω /Channel  
(20WRMS stereo)  
■ Output Power Limited Only By External  
FETs And Available Supply Voltage  
■ Will Drive A Wide Range Of Speakers  
■ High Efficiency (>92%)  
■ Due To High Efficiency, Power FETs Do Not  
Require Heatsinking  
■ Audio Bandwidth Of 20Hz to 20kHz  
■ Wide Input Voltage Range Of 7V-15V  
■ Low Output Signal Distortion <1%  
■ High Operating Frequency (350kHz) Helps  
To Reduce Output Filter Size  
■ Compact Design Minimizes EMI / RFI  
IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.  
PRODUCT HIGHLIGHT  
APPLICATIONS / BENEFITS  
Notebook Computers:  
■ Replaces existing internal low power linear  
amplifier with a high efficiency Class-D  
amplifier  
■ Enables the use of virtually any external  
speaker without amplification  
EFFICIENCY COMPARISON OF THE CLASS-D AMPLFIER  
100  
- Average Power Out for 20sec. approx. 512mW  
- Across 8.6 Ohm Load  
■ Precious battery life is extended  
■ Fully protected power topology can  
withstand shorts or external speaker  
failures without damage, overheating or  
posing fire hazard  
Linfinity's LX1720  
Class-D Amplifier  
80  
Desktop Computers:  
60  
■ Output power capability of up to 20WRMS  
per channel in an area less than 3"x3",  
without using expensive heatsinks  
■ Greatly reduced power supply  
requirements when compared to a linear  
solution of same power capabilities  
■ Any speakers can be used including  
conventional home stereo speakers  
■ Very light weight circuitry will not add to  
the overall weight of the system  
40  
Highly Integrated  
Linear Amplifier  
20  
■ Multimedia amplifier can be directly  
incorporated on the motherboard using  
surface mount components  
0
APPLICATION NOTE AN-11  
available on our web site  
or call 1-800-LMI-7011  
0
5
10  
15  
20  
Audio sample from "Hold On Tight"  
by Electric Light Orchestra  
Seconds  
PACKAGE ORDER INFO  
Maximum  
VDD  
Plastic SSOP  
44-pin  
TJ (°C)  
DB  
0 to 70  
15V  
LX1720-01CDB  
Note: Available in Tape & Reel.  
Append the letter "T" to part number. (i.e. LX1720-01CDBT)  
L I N F I N I T Y M I C R O E L E C T R O N I C S I N C .  
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570  
Copyright © 1999  
Rev. 1.0 9/99  
1
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7  
AudioMAXTM  
LX1720  
SWITCHING CLASS-D, STEREO POWER AMPLIFIER CONTROLLER IC  
P R O D U C T I O N D A T A S H E E T  
ABSOLUTE MAXIMUM RATINGS  
(Note 1)  
PACKAGE PIN OUTS  
Supply Voltage (PVDD, VDD)...................................................................... -0.3V to 18V  
RPWM .................................................................................................... -0.3V to VCN+0.3V  
INPUT (R), INPUT (L) .......................................................................... -0.3V to VCN+0.3V  
FBK+(R), FBK-(R), FBK+(L), FBK-(L), SLEEP.............................................. -0.3V to VDD  
MUTE (R), MUTE (L) .................................................................................... -0.3V to 6.0V  
EAOUT (R), EAOUT (L) ....................................................................... -0.3V to VCN+0.3V  
CPWM, CT ............................................................................................. -0.3V to VCN+0.3V  
IS+, LIS-, RIS+ ................................................................................................ VDD-2 to VDD  
Operating Junction Temperature  
1
44  
43  
42  
41  
40  
39  
38  
37  
36  
35  
34  
33  
32  
31  
30  
29  
28  
27  
26  
25  
24  
23  
RIS-  
LIS-  
FBK- (R)  
FBK+ (R)  
N.C.  
2
3
IS+  
4
RPWM  
CPWM  
CN  
VDD  
5
CP  
6
PVDD  
PGND  
P- (R)  
7
N.C.  
8
CT  
9
RT  
N- (R)  
N+ (R)  
P+ (R)  
P- (L)  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
RBIAS  
GND  
Plastic (DB Package) ............................................................................................ 125ºC  
Storage Temperature Range...................................................................... -65°C to 150°C  
Lead Temperature (Soldering, 10 seconds) ............................................................ 300°C  
AGND  
INPUT (R)  
INPUT (L)  
SLEEP  
N- (L)  
N+ (L)  
P+ (L)  
Note 1. 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.  
EAIN (R)  
N.C.  
PGND  
PVDD  
FBK- (L)  
FBK+ (L)  
GND  
EAOUT (R)  
FAOUT (R)  
EAOUT (L)  
EAIN (L)  
FAOUT (L)  
THERMAL DATA  
MUTE (L)  
MUTE (R)  
DB PACKAGE:  
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA  
65°C/W  
DB PACKAGE  
(Top View)  
Junction Temperature Calculation: TJ = TA + (PD x θJA).  
The θJA numbers are guidelines for the thermal performance of the device/pc-board  
system. All of the above assume no ambient airflow.  
FUNCTIONAL PIN DESCRIPTION  
Pin Name  
RIS-  
Description  
Pin Name  
FAOUT (R)  
EAOUT (L)  
EAIN (L)  
Description  
Right Channel Current Sense Input  
Left Channel Current Sense Input  
Positive Current Sense Input  
PWM Resistor Connection  
PWM Capacitor Connection  
Supply Decoupling for NFET Drivers  
Oscillator Timing Capacitor Connection  
Oscillator Timing Resistor  
Bias Setting Resistor for Error Amps  
Ground (2-pins)  
Output of Right Feedback Amp  
LIS-  
Left Channel Error Amplifier Output  
IS+  
Inverting Input of Left Channel Error Amp  
Output of Left Feedback Amp  
RPWM  
CPWM  
CN  
FAOUT (L)  
FBK+(R), FBK-(R) Right Channel Feedback Inputs  
CP  
Supply Decoupling for PFET Drivers  
Output Driver Supply Voltage (2-pins)  
Analog Supply Voltage  
CT  
PVDD  
RT  
VDD  
RBIAS  
GND  
PGND  
IC Power Ground for the Output Drivers (2-pins)  
Right Channel Gate Drive Outputs  
P+(R), N+(R),  
P-(R), N-(R)  
P+(L), N+(L),  
P-(L), N-(L)  
AGND  
INPUT (R)  
INPUT (L)  
SLEEP  
EAIN (R)  
EAOUT (R)  
Audio Input Ground  
Right Channel Input  
Left Channel Gate Drive Outputs  
Left Channel Input  
Sleep Input  
FBK+(L), FBK-(L) Left Channel Feedback Inputs  
Inverting Input of Right Channel Error Amp  
Right Channel Error Amplifier Output  
MUTE (R),  
MUTE (L)  
Mute Inputs  
Copyright © 1999  
Rev. 1.0 9/99  
2
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7  
AudioMAXTM  
LX1720  
SWITCHING CLASS-D, STEREO POWER AMPLIFIER CONTROLLER IC  
P R O D U C T I O N D A T A S H E E T  
ELECTRICAL CHARACTERISTICS  
(
Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C ≤ TA ≤ 70°C.  
Test conditions: RT = 30k, CT = 100pF, VDD = PVDD = 15V.)  
LX1720  
Min. Typ.  
Parameter  
Symbol  
Test Conditions  
Units  
Max.  
Oscillator Section  
Oscillator Frequency  
Oscillator Peak Voltage  
Oscillator Valley Voltage  
Oscillator Max. Frequency  
Voltage Stability  
280  
330  
2.5  
200  
1
380  
kHz  
V
mV  
MHz  
%
1
2
2
%
Temperature Stability  
Error Amplifiers  
Input Offset Voltage  
DC Open Loop Gain  
Unity Gain Bandwidth  
High Output Voltage  
Low Output Voltage  
Input Common Mode Range  
Input Bias Current  
5
60  
7
mV  
dB  
MHz  
V
mV  
V
4
1
IOUT = -100µA  
OUT = +100µA  
50  
5
1
I
µA  
Input Amplifiers  
Stage Gain  
Input Impedance  
Set by Internal Resistors  
3.465  
4
3.5  
42  
3.535  
V/V  
kΩ  
Feedback Amplifiers  
High Output Voltage  
Low Output Voltage  
Common Mode Rejection  
Input Common Mode Range  
Input Impedance  
IOUT = -250µA  
IOUT = +250µA  
V
mV  
dB  
50  
VDD  
93  
70  
0
V
388  
91  
kΩ  
mV/V  
89  
Stage Gain  
LX1720-01  
Set by Internal Resistors  
Current Limit Comparators  
Voltage Sense Threshold  
200  
220  
500  
240  
mV  
nsec  
Comparator Response Time  
PWM Comparators  
CPWM Delay To Output  
250  
nsec  
PWM Current Generator  
CPWM Charge Current  
Impedance of Internal Discharge FET  
RPWM = 75k  
75  
20  
µA  
Ω
Output Drivers For The N-Channel MOSFETs  
Ext. NFET Drivers, Low Level Voltage  
VOL  
ISINK = 3mA  
30  
1
100  
1.5  
mV  
V
ISINK = 75mA  
30  
1
100  
1.5  
mV  
V
Ext. NFET Drivers, High Level Voltage  
VOH  
ISOURCE = 3mA  
ISOURCE = 75mA, CN = 5.2V (applied externally)  
Output Drivers For The P-Channel MOSFETs  
Ext. PFET Drivers, Low Level Voltage  
VOL  
ISINK = 3mA  
30  
1
100  
1.5  
mV  
V
I
SINK = 75mA  
30  
1
100  
1.5  
mV  
V
Ext. PFET Drivers, High Level Voltage  
VOH  
ISOURCE = 3mA  
ISOURCE = 75mA, CP = 5.2V (applied externally)  
Copyright © 1999  
Rev. 1.0 9/99  
3
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7  
AudioMAXTM  
LX1720  
SWITCHING CLASS-D, STEREO POWER AMPLIFIER CONTROLLER IC  
P R O D U C T I O N D A T A S H E E T  
ELECTRICAL CHARACTERISTICS (Continued)  
LX1720  
Min. Typ.  
Parameter  
Symbol  
Test Conditions  
Units  
Max.  
Undervoltage Lockout Section  
Start Threshold Voltage  
UV Lockout Hysteresis  
6.3  
6.5  
500  
976  
6.7  
V
mV  
clkcyc  
UVLO Delay To Output Enable  
Supply Current  
Sleep Current  
Operating Current  
Sleep To Output Enable  
Sleep Threshold  
SLEEP Input = 0V, TA = 25°C  
SLEEP Input = 2V, VIN = 15V, No MOSFETs Connected  
20  
5
976  
1.45  
µA  
mA  
clkcyc  
V
7
1.2  
1.6  
1.6  
1.8  
Mute Section  
Mute Threshold  
1.7  
V
Copyright © 1999  
Rev. 1.0 9/99  
4
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7  
AudioMAXTM  
LX1720  
SWITCHING CLASS-D, STEREO POWER AMPLIFIER CONTROLLER IC  
P R O D U C T I O N D A T A S H E E T  
BLOCK DIAGRAM  
R
C
T
T
P
P
G
V
N
D
C
L
K
O
S
C
D
D
S
L
E
E
A
P
S
V
C
P
P
R
E
G
R
B
I
V
D
D
U
V
L
O
V
R
E
F
-
(
R
)
B
I
A
S
C
N
E
A
O
U
T
(
R
)
N
-
(
R
)
E
A
I
N
(
(
R
R
)
)
S
Q
Q
F
B
K
+
E
r
r
o
r
A
m
p
R
P
+
(
R
)
F
B
K
-
(
R
)
C
L
K
F
A
e
e
d
b
a
c
k
m
p
N
+
(
R
)
F
A
O
U
U
T
T
(
(
R
R
)
)
O
U
T
P
U
T
D
R
I
V
E
R
S
I
N
P
A
N
D
P
R
O
T
E
C
T
I
O
N
M
U
T
E
(
R
)
I
n
p
u
t
A
m
p
C
I
R
C
U
I
T
R
Y
P
-
(
L
)
V
D
D
V
D
D
N
-
(
L
)
C
L
K
R
C
P
P
W
W
M
M
P
+
(
L
)
S
Q
Q
E
A
O
U
T
(
L
)
R
N
+
(
L
)
E
A
I
N
(
L
)
E
r
r
o
r
A
m
p
C
L
K
F
B
K
+
(
L
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F
B
K
-
(
L
)
F
A
e
e
d
b
a
c
k
m
p
F
A
O
U
U
T
T
(
(
L
L
)
)
I
N
P
M
U
T
E
(
L
)
I
n
p
u
t
A
m
p
FIGURE 1 — LX1720 Block Diagram  
Copyright © 1999  
Rev. 1.0 9/99  
5
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7  
AudioMAXTM  
LX1720  
SWITCHING CLASS-D, STEREO POWER AMPLIFIER CONTROLLER IC  
P R O D U C T I O N D A T A S H E E T  
TYPICAL APPLICATION  
V
=
7
V
T
O
1
5
V
I
N
R
6
R
5
C
C
C
C
1
1
9
1
8
1
7
6
I
S
+
L
I
S
-
R
I
S
-
Q
Q
1
2
P
V
V
D
D
D
L
L
L
L
P
-
(
R
)
1
2
4
6
D
C
P
N
-
(
R
)
C
R
P
P
R
R
R
R
1
2
3
4
C
C
C
C
C
R
1
3
5
7
2
P
W
M
W
M
F
F
F
F
B
B
B
B
K
K
K
K
-
+
-
+
(
R
)
C
C
C
C
9
1
1
1
R
I
T
R
T
C
C
2
2
4
5
Q
Q
3
4
R
I
G
H
T
I
N
L
N
N
P
P
U
U
T
T
(
(
R
L
)
+
P
(
R
)
3
L
E
F
T
I
N
I
S
)
N
+
(
R
)
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L
E
E
P
L
E
E
P
C
4
(
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)
R
M
U
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R
L
M
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E
0
1
2
L
M
U
T
E
M
U
T
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C
C
2
0
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Q
5
6
L
5
P
-
(
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)
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R
7
C
C
2
1
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A
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T
(
(
R
L
)
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F
A
I
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8
C
6
A
A
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(
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(
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2
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2
3
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A
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7
8
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(
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7
L
8
N
(
L
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1
0
F
)
N
+
(
L
)
C
F
B
K
-
(
R
)
8
F
F
B
B
K
K
-
+
(
(
R
L
)
(
L
)
F
B
K
+
(
R
)
)
)
(
(
R
L
)
F
B
K
-
(
(
F
F
L
L
B
B
K
K
-
+
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A
G
N
D
F
B
K
+
)
For detailed application  
information please refer to  
APPLICATION NOTE AN-11  
available on our web site  
or call 1-800-LMI-7011  
FIGURE 2 — Typical Class-D Stereo Switching Amplifier Circuit Application  
PRODUCTIONDATA-InformationcontainedinthisdocumentisproprietarytoLinFinity, andiscurrentasofpublicationdate. Thisdocument  
may not be modified in any way without the express written consent of LinFinity. Product processing does not necessarily include testing of  
all parameters. Linfinity reserves the right to change the configuration and performance of the product and to discontinue product at any time.  
Copyright © 1999  
Rev. 1.0 9/99  
6

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