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AudioMAX
T
HE
TM
LX1720
D
ATA
SWITCHING CLASS-D, STEREO POWER AMPLIFIER CONTROLLER IC
I
NFINITE
P
OWER
OF
I
NNOVATION
P
RODUCTION
S
HEET
DESCRIPTION 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). Its high efficiency (>92%) eliminates the need for heat sinks -- even while delivering 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 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.
K E Y F E AT U R E S
s Integrated Switching (Class-D) Stereo Power Amplifier Controller IC s Delivers >10WRMS Across 8 /Channel (20WRMS stereo) s Output Power Limited Only By External FETs And Available Supply Voltage s Will Drive A Wide Range Of Speakers s High Efficiency (>92%) s Due To High Efficiency, Power FETs Do Not Require Heatsinking s Audio Bandwidth Of 20Hz to 20kHz s Wide Input Voltage Range Of 7V-15V s Low Output Signal Distortion <1% s High Operating Frequency (350kHz) Helps To Reduce Output Filter Size s Compact Design Minimizes EMI / RFI
IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.
PRODUCT HIGHLIGHT
APPLICATIONS / BENEFITS
EF F I C I E N C Y COMPARISON
100
OF THE
C L A S S - D AMPLFIER
Notebook Computers:
s Replaces existing internal low power linear amplifier with a high efficiency Class-D amplifier s Enables the use of virtually any external speaker without amplification s Precious battery life is extended s Fully protected power topology can withstand shorts or external speaker failures without damage, overheating or posing fire hazard
- Average Power Out for 20sec. approx. 512mW - Across 8.6 Ohm Load 80
Linfinity's LX1720 Class-D Amplifier
Efficiency (%)
60
Desktop Computers:
s Output power capability of up to 20WRMS per channel in an area less than 3"x3", without using expensive heatsinks s Greatly reduced power supply requirements when compared to a linear solution of same power capabilities s Any speakers can be used including conventional home stereo speakers s Very light weight circuitry will not add to the overall weight of the system s Multimedia amplifier can be directly incorporated on the motherboard using surface mount components
40
20
Highly Integrated Linear Amplifier
0
0
5
10
15
20
APPLICATION NOTE AN-11
available on our web site or call 1-800-LMI-7011
Audio sample from "Hold On Tight" by Electric Light Orchestra
Seconds
PA C K A G E O R D E R I N F O TJ (C) 0 to 70
Maximum VDD
15V
DB Plastic SSOP 44-pin
LX1720-01CDB
Note: Available in Tape & Reel. Append the letter "T" to part number. (i.e. LX1720-01CDBT)
Copyright (c) 1999 Rev. 1.0 9/99
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
PRODUCT DATABOOK 1996/1997
LX1720
SWITCHING CLASS-D, STEREO POWER AMPLIFIER CONTROLLER IC
P
RODUCTION
AudioMAX
D
ATA
TM
S
HEET PA C K A G E P I N O U T S
RISLISIS+ RPWM CPWM CN N.C. CT RT RBIAS GND AGND INPUT (R) INPUT (L) SLEEP EAIN (R) N.C. EAOUT (R) FAOUT (R) EAOUT (L) EAIN (L) FAOUT (L)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23
A B S O L U T E M A X I M U M R AT I N G S
(Note 1)
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 Plastic (DB Package) ............................................................................................ 125C Storage Temperature Range ...................................................................... -65C to 150C Lead Temperature (Soldering, 10 seconds) ............................................................ 300C
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.
T H E R M A L D ATA
DB PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA 65C/W
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)
Junction Temperature Calculation: TJ = TA + (PD x JA). The JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow.
DB PACKAGE (Top View)
FUNCTIONAL PIN DESCRIPTION
Pin Name
RISLISIS+ RPWM CPWM CN CT RT RBIAS GND AGND INPUT (R) INPUT (L) SLEEP EAIN (R) EAOUT (R)
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) 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
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)
Description
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 (c) 1999 Rev. 1.0 9/99
PRODUCT DATABOOK 1996/1997
AudioMAX
TM
LX1720
SWITCHING CLASS-D, STEREO POWER AMPLIFIER CONTROLLER IC
P
RODUCTION
D
ATA
S
HEET
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, the following specifications apply over the operating ambient temperature 0C TA 70C. Test conditions: RT = 30k, CT = 100pF, VDD = PVDD = 15V.)
Parameter Oscillator Section
Oscillator Frequency Oscillator Peak Voltage Oscillator Valley Voltage Oscillator Max. Frequency Voltage Stability Temperature Stability
Symbol
Test Conditions
Min.
280
LX1720 Typ.
330 2.5 200 1 1 2 5 60 7
Max.
380
Units
kHz V mV MHz % % mV dB MHz V mV V A V/V k V mV dB V k mV/V mV nsec nsec A
2
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
IOUT = -100A IOUT = +100A
4 1 50 5 1 3.5 42 3.535
Input Amplifiers
Stage Gain Input Impedance Set by Internal Resistors 3.465
Feedback Amplifiers
High Output Voltage Low Output Voltage Common Mode Rejection Input Common Mode Range Input Impedance Stage Gain LX1720-01 IOUT = -250A IOUT = +250A 4 50 70 0 Set by Internal Resistors 89 200 388 91 220 500 250 RPWM = 75k 75 20 VDD 93 240
Current Limit Comparators
Voltage Sense Threshold Comparator Response Time
PWM Comparators
CPWM Delay To Output
PWM Current Generator
CPWM Charge Current Impedance of Internal Discharge FET
Output Drivers For The N-Channel MOSFETs
Ext. NFET Drivers, Low Level Voltage Ext. NFET Drivers, High Level Voltage VOL VOH ISINK = 3mA ISINK = 75mA ISOURCE = 3mA ISOURCE = 75mA, CN = 5.2V (applied externally) ISINK = 3mA ISINK = 75mA ISOURCE = 3mA ISOURCE = 75mA, CP = 5.2V (applied externally) 30 1 30 1 30 1 30 1 100 1.5 100 1.5 100 1.5 100 1.5 mV V mV V mV V mV V
Output Drivers For The P-Channel MOSFETs
Ext. PFET Drivers, Low Level Voltage Ext. PFET Drivers, High Level Voltage VOL VOH
Copyright (c) 1999 Rev. 1.0 9/99
3
PRODUCT DATABOOK 1996/1997
LX1720
SWITCHING CLASS-D, STEREO POWER AMPLIFIER CONTROLLER IC
P
RODUCTION
AudioMAX
D
ATA
TM
S
HEET
(Continued)
ELECTRICAL CHARACTERISTICS Parameter Undervoltage Lockout Section
Start Threshold Voltage UV Lockout Hysteresis UVLO Delay To Output Enable
Symbol
Test Conditions
Min.
6.3
LX1720 Typ.
6.5 500 976 20 5 976 1.45 1.7
Max.
6.7
Units
V mV clkcyc A mA clkcyc V V
Supply Current
Sleep Current Operating Current Sleep To Output Enable Sleep Threshold SLEEP Input = 0V, TA = 25C SLEEP Input = 2V, VIN = 15V, No MOSFETs Connected 1.2 1.6 7 1.6 1.8
Mute Section
Mute Threshold
4
Copyright (c) 1999 Rev. 1.0 9/99
PRODUCT DATABOOK 1996/1997
AudioMAX
TM
LX1720
SWITCHING CLASS-D, STEREO POWER AMPLIFIER CONTROLLER IC
P
RODUCTION
D
ATA
S
HEET
BLOCK DIAGRAM
RT CT SLEEP R B IA S VDD CN E A O U T (R ) E A IN (R ) S Q R CLK Q E rro r A m p F B K + (R ) F B K - (R ) Feedback Amp
U VLO VREF B IA S
OSC
CLK
PGND PVDD V
REG
CP
P - (R )
N - (R )
P + (R )
F A O U T (R ) IN P U T (R ) M U T E (R ) VDD
In p u t A m p VDD
OUT D R IV AN PROTE C IR C U
PU ER D CT IT
T S
N + (R )
IO N RY
P - (L )
N - (L ) RPW M CPW M S Q R E rro r A m p CLK Q E A O U T (L ) E A IN (L ) F B K + (L ) F B K - (L ) Feedback Amp
R IS L IS IS +
CLK P + (L )
N + (L )
F A O U T (L ) IN P U T (L ) M U T E (L )
In p u t A m p
FIGURE 1 -- LX1720 Block Diagram
Copyright (c) 1999 Rev. 1.0 9/99
5
PRODUCT DATABOOK 1996/1997
LX1720
SWITCHING CLASS-D, STEREO POWER AMPLIFIER CONTROLLER IC
P
RODUCTION
AudioMAX
D
ATA
TM
S
HEET
T Y P I C A L A P P L I C AT I O N
V
IN
= 7V TO
15V R
6
R
5
C
19
C
18
C
17
C
16
IS + PVDD VDD C
P PW M
L IS -
R IS P - (R ) Q Q
1
L
1
L
2
R
CP RPW M RT
N - (R )
2
R
1
9
R IG H T IN L E F T IN SLEEP RM UTE LM U TE C
C
24
R
T
IN P U T (R ) IN P U T (L ) SLEEP RM UTE C C
21
P + (R ) Q
Q
3
L
3
L
4
25
N + (R )
4
R
2
LX1720
LM U TE
20
C P - (L ) N - (L ) Q
6
F B K + (R )
10
C
3
C
4
Q
5
R
7
L
5
L
6
E A O U T (R ) E A IN (R ) F A O U T (R )
R
8
R
3
C
23
R
9
11
E A O U T (L ) E A IN (L ) F A O U T (L ) F B K - (R ) F B K + (R ) F B K - (L ) F B K + (L )
P + (L ) Q
Q
7
L7
8
L8
R
10
F B K - (R ) F B K + (R ) F B K - (L ) F B K + (L )
N + (L )
R
4
C AGND
F B K + (L )
12
C
7
C
8
CPW M
PGND
For detailed application information please refer to
GND
CT
CN
APPLICATION NOTE AN-11
available on our web site or call 1-800-LMI-7011
PW M T
C
C
FIGURE 2 -- Typical Class-D Stereo Switching Amplifier Circuit Application
PRODUCTION DATA - Information contained in this document is proprietary to LinFinity, and is current as of publication date. This document 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.
C
N
6
Copyright (c) 1999 Rev. 1.0 9/99
LEFT
C
22
C
F B K -(L )
C
5
C
6
R IG H T
C
F B K -(R )
C
1
C
2

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