Microsemi Corporation LX1720-01CDB Datasheet
TM
AudioMAX
LX1720
SWITCHING CLASS-D, STEREO POWER AMPLIFIER CONTROLLER IC
T HE I NFINITE P OWER OF I NNOVATION
DESCRIPTION KEY FEATURES
The LX1720 is a highly-integrated,
Switching Class-D Stereo Power Amplifier Controller IC with power and
size features that make it ideal for multimedia computer applications, as well as
other applications where high fidelity
sound is required.
With input voltage ranging from 7V15V, 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).
IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.
Its high efficiency (>92%) eliminates the
need for heat sinks — even while delivering more than 10W
per channel (20W
SO-8 power FETs.
across 8 ohms
RMS
stereo) with 0.1 ohm
RMS
The LX1720's output power is limited
only by external FETs and available supply voltage.
While offering breakthrough performance capabilities for notebooks, the
LX1720 is equally attractive for multimedia systems or to drive full-size home
theatre speakers.
PRODUCT HIGHLIGHT
EFFICIENCY COMPARISON OF THE CLASS-D AMPLFIER
100
- Average Power Out for 20sec. approx. 512mW
- Across 8.6 Ohm Load
80
Linfinity's LX1720
Class-D Amplifier
60
40
Efficiency (%)
Highly Integrated
20
0
0
Audio sample from "Hold On Tight"
by Electric Light Orchestra
5
10
Seconds
Linear Amplifier
15 20
P RODUCTION DATA SHEET
■■
■ Integrated Switching (Class-D) Stereo
■■
Power Amplifier Controller IC
■■
■ Delivers >10W
■■
■■
■ Output Power Limited Only By External
■■
■■
■ Will Drive A Wide Range Of Speakers
■■
■■
■ High Efficiency (>92%)
■■
■■
■ Due To High Efficiency, Power FETs Do Not
■■
■■
■ Audio Bandwidth Of 20Hz to 20kHz
■■
■■
■ Wide Input Voltage Range Of 7V-15V
■■
■■
■ Low Output Signal Distortion <1%
■■
■■
■ High Operating Frequency (350kHz) Helps
■■
■■
■ Compact Design Minimizes EMI / RFI
■■
stereo)
(20W
RMS
FETs And Available Supply Voltage
Require Heatsinking
To Reduce Output Filter Size
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
■■
■ Precious battery life is extended
■■
■■
■ Fully protected power topology can
■■
withstand shorts or external speaker
failures without damage, overheating or
posing fire hazard
Desktop Computers:
■■
■ Output power capability of up to 20W
■■
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
■■
■ Multimedia amplifier can be directly
■■
incorporated on the motherboard using
surface mount components
APPLICATION NOTE AN-11
available on our web site
or call 1-800-LMI-7011
Across 8Ω /Channel
RMS
RMS
Copyright © 1999
Rev. 1.0 9/99
PACKAGE ORDER INFO
T
(°C)
J
Maximum
VDD
Plastic SSOP
DB
44-pin
0 to 70 15V LX1720-01CDB
Append the letter "T" to part number. (i.e. LX1720-01CDBT)
Note: Available in Tape & Reel.
L INF INITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
LX1720
PRODUCT DATABOOK 1996/1997
TM
AudioMAX
SWITCHING CLASS-D, STEREO POWER AMPLIFIER CONTROLLER IC
P RODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS (Note 1)
Supply Voltage (PVDD, VDD) ...................................................................... -0.3V to 18V
RPWM .................................................................................................... -0.3V to VCN+0.3V
INPUT (R), INPUT (L) .......................................................................... -0.3V to V
FBK+(R), FBK-(R), FBK+(L), FBK-(L), SLEEP .............................................. -0.3V to V
+0.3V
CN
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 V
Operating Junction Temperature
Plastic (DB Package) ............................................................................................ 125ºC
Storage Temperature Range ...................................................................... -65°C to 150°C
Lead Temperature (Soldering, 10 seconds) ............................................................ 300°C
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.
THERMAL DATA
DB PACKAGE:
D
x θ
θθ
θ
θθ
JA
).
JA
65°C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
Junction Temperature Calculation: TJ = TA + (P
The θ
numbers are guidelines for the thermal performance of the device/pc-board
JA
system. All of the above assume no ambient airflow.
FUNCTIONAL PIN DESCRIPTION
PACKAGE PIN OUTS
RIS-
DD
DD
RPWM
CPWM
N.C.
RBIAS
GND
AGND
INPUT (R)
INPUT (L)
SLEEP
EAIN (R)
N.C.
EAOUT (R)
FAOUT (R)
EAOUT (L)
EAIN (L)
FAOUT (L)
144
243
LIS-
342
IS+
441
540
639
CN
738
837
CT
936
RT
10 35
11 34
12 33
13 32
14 31
15 30
16 29
17 28
18 27
19 26
20 25
21 24
22 23
DB PACKAGE
(Top View)
FBK- (R)
FBK+ (R)
N.C.
VDD
CP
PVDD
PGND
P- (R)
N- (R)
N+ (R)
P+ (R)
P- (L)
N- (L)
N+ (L)
P+ (L)
PGND
PVDD
FBK- (L)
FBK+ (L)
GND
MUTE (L)
MUTE (R)
Pin Name Description
RISLIS-
IS+
RPWM
CPWM
CN
CT
RT
RBIAS
GND
AGND
INPUT (R)
INPUT (L)
SLEEP
EAIN (R)
EAOUT (R)
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)
Audio Input Ground
Right Channel Input
Left Channel Input
Sleep Input
Inverting Input of Right Channel Error Amp
Right Channel Error Amplifier Output
Pin Name Description
FAOUT (R)
EAOUT (L)
EAIN (L)
FAOUT (L)
FBK+(R), FBK-(R)
CP
PVDD
VDD
PGND
P+(R), N+(R),
P-(R), N-(R)
P+(L), N+(L),
P-(L), N-(L)
FBK+(L), FBK-(L)
MUTE (R),
MUTE (L)
Output of Right Feedback Amp
Left Channel Error Amplifier Output
Inverting Input of Left Channel Error Amp
Output of Left Feedback Amp
Right Channel Feedback Inputs
Supply Decoupling for PFET Drivers
Output Driver Supply Voltage (2-pins)
Analog Supply Voltage
IC Power Ground for the Output Drivers (2-pins)
Right Channel Gate Drive Outputs
Left Channel Gate Drive Outputs
Left Channel Feedback Inputs
Mute Inputs
2
Copyright © 1999
Rev. 1.0 9/99
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