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AudioMAXTM
INTEGRATED PRODUCTS
LX1710/1711
Class-D Mono Power Amplifier Controller IC
PRODUCTION
DESCRIPTION
KEY FEATURES
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The LX1710/1711 is a monolithic high performance integrated class-D controller IC designed for high efficiency audio requirements such as portable or battery operated products, automotive amplifier, and multimedia applications. This high frequency, full audio bandwidth switching power amplifier controller, is a completely new design with dramatically improved performance over Linfinity's previous generation amplifier products. Enhancements include better SNR, lower noise floor, and reduced THD. Combined with output power MOSFET's and an output filter, the
LX1710/1711 is a complete class-D audio solution. A complete audio amplifier module is available to quickly evaluate the LX1710 controller. Simply connect the amplifier to the power source, audio signal, and speakers. Reference designs support a variety of requirements including multi channel systems, subwoofers, and various speaker loads (2, 4, 8). The versatile amplifier solution can easily be adjusted for frequency response, optimized for efficiency and performance, or designed to minimize PCB area and component count. The LX1710/LX1711 is available in a space saving 28-pin SSOP package.
IMPORTANT: For the most current data, consult MICROSEMI's website: http://www.microsemi.com
PRODUCT HIGHLIGHT
! Integrated Switching Class-D Single Channel Controller IC ! Full 20Hz-20kHz Audio Bandwidth ! High Fidelity (LX1710) Or High Power (LX1711) Versions Available ! Single Supply Operation ! THD+N <0.05% Typical (1Wrms, 1kHz, 4) ! Maximum Efficiency 80%-85% ! Output Power >50Wrms (LX1711, 4, 1% THD+N) ! PSRR -70dB Typical ! Differential Input To Minimize Noise Effects ! Supports Multi-Channel Systems ! Complete LXE1710 Amplifier Evaluation Module Available ! 28-Pin SSOP Package APPLICATIONS/BENEFITS APPLICATIONS/BENEFITS ! ! ! ! ! ! ! ! Notebook Computers Desktop Computers Multimedia Speakers Automotive Amplifiers And Headunits Battery Operated Equipment (Megaphone, PA System) Portable Audio (Boom Box) Wireless Speakers High Power Subwoofer
Class-D Amplifier Efficiency Comparison
LX1710/1711 LX1710/1711
PACKAGE ORDER INFO TJ (C) 0 to 70
Copyright 2000 Rev. 1.3a, 2002-05-03
VDD 7V-15V 7V-25V
DB Plastic SSOP 28-PIN
LX1710CDB LX1711CDB
Page 1
Microsemi
Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
AudioMAXTM
INTEGRATED PRODUCTS
LX1710/1711
Class-D Mono Power Amplifier Controller IC
PRODUCTION
THERMAL DATA
PACKAGE PIN OUT
VREF GND N.C. V25 RPW M CPW M INPUT+ INPUTINAMPOUT SLEEP MUTE STATUS EAIN EAOUT 28 CLOCK ISCP VDD PVDD P+ N+ NPPGND CN FBKFBK+ FAOUT
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DB
PACKAGE 50C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA
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.
14
15
DESCRIPTION (CONTINUED)
The mono output controller is available in either an LX1711 high power version (>50Wrms, 4) with a supply voltage range of 7V-25V or an LX1710 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 it designed to operate over the full 20Hz to 20kHz audio band. Signal distortion measurements yield THD+N levels less than 0.05%
(1kHz, 1Wrms). Efficiency is greater than 80% typical, which eliminates the need for heatsinks, even at maximum output power. The AudioMAXTM 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.
FUNCTIONAL PIN DESCRIPTION
Pin Name
VREF GND N.C. V25 RPWM CPWM INPUT+ INPUT INAMPOUT SLEEP MUTE STATUS EAIN EAOUT
Description
5V Reference Low Current Ground No Connect 2.5V Reference PWM Resistor Connection PWM Capacitor Connection Positive Audio Input Negative Audio Input Input Amplifier Output Sleep Input (active low) Mute Input (active high) UVLO Indicator (Open Collector Output) Inverting Input of Error Amplifier Error Amplifier Output
Pin Name
FAOUT FBK+ FBKCN PGND PNN+ P+ PVDD VDD CP IS CLOCK
Description
Feedback Amplifier Output Feedback Amplifier Non-Inverting Input Feedback Amplifier Inverting Input Supply Decoupling for NFET Drivers Output Driver High Current Ground
Drive for PFET on Negative Half of Bridge Drive for NFET on Negative Half of Bridge Drive for NFET on Positive Half of Bridge Drive for PFET on Positive Half of Bridge
PACKAGE DATA PACKAGE DATA
Output Driver Supply Voltage Analog Supply Voltage Supply Decoupling for PFET Drivers Current Limit Sense Input Input / Output Clock for Synch Operation
Copyright 2000 Rev. 1.3a, 2002-05-03
Microsemi
Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
AudioMAXTM
INTEGRATED PRODUCTS
LX1710/1711
Class-D Mono Power Amplifier Controller IC
PRODUCTION
ABSOLUTE MAXIMUM RATINGS
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Supply Voltage (PVDD, VDD)........................................................................................................................................................ -0.3V to 30V SLEEP, STATUS, FBK+, FBK- ............................................................................................................................................ -0.3V to VDD +0.3V IS- ............................................................................................................................................................................... PVDD -2 to PVDD to +0.3V RPWM, CPWM, MUTE ........................................................................................................................................................-0.3V to VREF+0.3V INPUT +, INPUT -, INAMPOUT..........................................................................................................................................-0.3V to VREF+0.3V EAIN, EAOUT, FAOUT .......................................................................................................................................................-0.3V to VREF+0.3V CLOCK ....................................................................................................................................................................................-0.3V to CN +0.3V Operating Junction Temperature Plastic (DB Package) .............................................................................................................................. 125OC Storage Temperature Range .........................................................................................................................................................-65 OC to 150 OC Lead Temperature (Soldering, 10 seconds).................................................................................................................................................300 OC
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.
ELECTRICAL CHARACTERISTICS Unless otherwise specified, the following specifications apply over the operating ambient temperature 0C < TA < 70C. Test conditions: RPWM = 49.9k, CPWM = 100pF, VDD = PVDD = 15V
Parameter
Evaluation Module (See Figure 2) Supply Voltage LX1710 LX1711
Symbol
Test Conditions
LX1710 / 1711 Min Typ. Max
7 7 15 25 -70 25
Units
VDD PSRR PO VIN = 15V, VRIPPLE = 1VRMS, 10Hz to 10kHz VIN = 15V, RL=4, THD+N=1%, 10Hz to 22kHz VIN = 25V, RL=4, 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 = 4, PO = 1W
V dB W
Power Supply Rejection Ratio Output Power
54 82 85 .05 .3 81 335 -110 110 3.4 1.6 0.6 1.0 1.5 5 60 7 % % dBr kHz A A V V % % % `mV dB `mHz V `mV A V/V V Page 3
Efficiency Total Harmonic Distortion Plus Noise Signal-To-Noise Ratio Oscillator Section Oscillator Frequency Charge Current Discharge Current Oscillator Peak Voltage Oscillator Valley Voltage Voltage Stability Temperature Stability 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 Input Amplifier Stage Gain Output Voltage, High Copyright 2000 Rev. 1.3a, 2002-05-03 VIO AOL UGBW VOH VOL IIN THD+N SNR FOSC ICHG IDIS VPK VVAL
(varies with VDD pin voltage) (varies with VDD pin voltage) (varies with VDD pin voltage) (varies with VDD pin voltage) VDD = 8V to 25V TA = 0OC to 70OC TA = -40OC to 125OC
2 2
ELECTRICALS
IOUT = -100A IOUT = +100A VIN = 1V to VREF Set by Internal Resistors IOUT = -100A
VREF -1 50 1 3.465 3.85 3.5 3.535
VOH
Microsemi
Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
AudioMAXTM
INTEGRATED PRODUCTS
LX1710/1711
Class-D Mono Power Amplifier Controller IC
PRODUCTION
ELECTRICAL CHARACTERISTICS (CONTINUED)
W W W.Microsemi .COM
Parameter
Output Voltage, Low Input Impedance Feedback Amplifier Stage Gain Input Impedance Current Limit Comparator Voltage Sense Threshold Blanking Pulse Delay Response Time IUM Pulses required to Current Limit Latch Consecutive Clear Pulses required to reset IUM counter Reference Voltage Section Initial Accuracy Voltage Stability Temperature Stability Line Regulation Load Regulation Under voltage Lockout Section Start Threshold Voltage UV Lockout Hysteresis UVLO Delay To Output Enable Supply Current Sleep Current Operating Current Sleep to Output Enable Sleep Threshold Mute Section Mute Threshold Output Drivers for N-Channel MOSFETs NFET Drivers, Low Level Voltage LX1710 LX1711
Symbol
VOL
Test Conditions
IOUT = +100A
Min
LX1710 / 1711 Typ. Max
1.3 42
Units
`mV `k `mV/V `mV/V k
Set by Internal Resistors Set by Internal Resistors
89 56
91 57 388 210 500 250 9 2 5.000 25 2 4 0.5 5 6.5 6.5 62,500 25 2.9
93 58
190 Excluding blanking pulse 9 2
230
mV `ns `ns `cycles `cycles
9 2
TA = 0OC to 70OC TA = -40OC to 125OC VDD = 9V to 15V IOUT = 0 to 20mA
50 5 10
`mV `mV `mV `mV `mV V V clkcyc A
0.5 SLEEP Input = 0V, TA = 25OC SLEEP Input = 2V, VIN = 15V, No MOSFETs connected 1.2 1.6 VOL VOH ISINK = 3mA ISINK = 75mA ISOURCE = 3mA, CN = 5.2V applied externally ISOURCE = 75mA, CN = 5.2V applied externally ISINK = 3mA ISINK = 75mA ISOURCE = 3mA, CP = 5.2V (applied externally) ISOURCE = 75mA, CP = 5.2V (applied externally)
5.0 1.6 1.8 100 2.0 100 2.0 100 1.5 100 1.5
`mV clkcyc V V `mV V `mV V `mV V `mV V
62,500 1.45 1.7 30 1.5 30 1.5 30 1 30 1
NFET Drivers, High Level Voltage Output Drives For P-Channel MOSFETs
E ELECTRICALS
PFET Drivers, Low Level Voltage
VOL VOH
PFET Drivers, High Level Voltage
Copyright 2000 Rev. 1.3a, 2002-05-03
Microsemi
Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
AudioMAXTM
INTEGRATED PRODUCTS
LX1710/1711
Class-D Mono Power Amplifier Controller IC
PRODUCTION
BLOCK DIAGRAM
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LX1710/11 SIMPLIFIED BLOCK DIAGRAM
VDD
25
10 S LEEP
1 IS27 PVDD + CLK
V RE F V25 CN
UVLO & REFERENCE
4 5V Reference 18
CLOCK 28 RP W M CP W M 5 6
220m V
SYNC
OSC
24 CURRENT SENSE 5V Reference 26
PVDD CP
EAOUT 14 23 EA IN 13 ERROR A MP
S CLK R Q Q
P+
FA ULT TIMER
INA MPO UT 9
OUTPUT DRIVERS & LOGIC
22
N+
21 20
NP-
INPUT -
8
INPUT +
7 INPUT AMP
MUTE
15 FAOUT MUX
MUTE
17
FB K-
16 MUTE FEE DB ACK AMP 11
FBK+
Figure 1 - LX1710 Block Diagram APPLICATION INFORMATION
Frequency Synchronization
Two or more LX1710 / LX1711 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.
Oscillator Configuration (RPWM and CPWM selection)
BLOCK DIAGRAM BLOCK DIAGRAM
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:
Frequency =
1 (0.577)( RPWM )(CPWM ) + 320ns
Page 5
Copyright 2000 Rev. 1.3a, 2002-05-03
Microsemi
Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
AudioMAXTM
INTEGRATED PRODUCTS
LX1710/1711
Class-D Mono Power Amplifier Controller IC
PRODUCTION
W W W.Microsemi .COM
TYPICAL APPLICATION
VIN7V to 15V C9 0.1F 35V + C13 + + 2.2F C11 4.7F
C22 .1F
25 VDD 24 PVDD
CLOCK 28 NC
C17 220F 25V
RS1 .0347
IS- 27 26 CP 5 RPWM 6 1 4 CPWM VREF V25 P+ 23
R12 10 ohm Q1
C12 .1F L1 15H
R5 34.8K C1 C16 100pF 1F
*
C2 1F SLEEP MUTE
N+ 22
Q2 R11 10 ohm C8 .1F 50V
R3 24.3K C7 220pF
C20 .68F
R13 15 ohm 1W C18 .47F
2 GND
LX1710
10 SLEEP 11 MUTE
NC R8 10K C26 330pF C3 470nF
P- 20
R6 10 ohm
Q3
C21 .68F
C19 .47F
AUDIO INPUT
9 INAMPOUT 7 INPUT+ N21
R10 10 ohm Q4
L2 15H
8 INPUTR9 10K C14 470nF C5 18pF R1 56.2K C4 150pF
PGND 19
R4 24.3K C6 220pF
3 14
C10 4.7F
NC EAOUT
+
CN 18 FBK+ 16
13 EAIN 15 FAOUT
FBK- 17 STATUS 12
NC
R2 10K
*This node is signal GND one of two grounds in the schematic, the others are power GND. These two grounds should be connected together as a star connection somewhere close to power supply ground pin
Figure 2 - Typical Class-D Switching Amplifier Circuit Application
APPLICATIONS APPLICATIONS
Copyright 2000 Rev. 1.3a, 2002-05-03
Microsemi
Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6
AudioMAXTM
INTEGRATED PRODUCTS
LX1710/1711
Class-D Mono Power Amplifier Controller IC
PRODUCTION
THD+N VS. FREQUENCY
100 50 20 10 5 2 THD + N (%) 1 0.5 0.23 0.1 0.04 0.01 0.005 0.002 0.001 20
THD+N VS. OUTPUT POWER
100 50 20 10 5 2 1 0.5 0.26 0.1 0.04 0.02 0.01 0.005 0.002
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50
100
200
500
1.00k Frequency (Hz)
2k
5k
7.96k 10k
20k
THD + N (%)
0.001
50m
100m 200m 500m
1.13 2 Output Power (W )
5
10 20
24.56 30
VIN = 15V RL = 4 PO =1 W RMS
VIN = 15V fIN =1 kHz RL = 4
FREQUENCY RESPONSE
+20 +15 +10 Voltage Amplification (dBr) +5 -0.08 -0.59 -5 -10 -15 -20 10
POWER BAND
50 45 40 Output Power (W) 35 30 25 20 15 10 5
2 4 8
18.2
50
100 200
500
1k 2k
5k
10k 17.88k
50k
80k
20
50
100 200
500 Frequency (Hz)
1k
2k
5k
10k
20k
Frequency (Hz)
VIN = 15V RL = 4 PO = 1W RMS
VIN = 15V THD+N = 1%
GRAPHS GRAPHS
Copyright 2000 Rev. 1.3a, 2002-05-03
Microsemi
Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 7
AudioMAXTM
INTEGRATED PRODUCTS
LX1710/1711
Class-D Mono Power Amplifier Controller IC
PRODUCTION
EFFICIENCY VS. OUTPUT POWER
90% 85% 80%
OUTPUT POWER VS. SUPPLY VOLTAGE
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60 50
Output Power (W)
Efficency (%)
75% 70% 65% 60% 55% 50% 45% 0 5 10 15
Output Power (W)
40 30 20 10
20
25
30
0 6 11 16
Supply Voltage (VIN)
21
26
8
4
2
VIN = 15V fIN = 1kHz
fIN = 1kHz RL = 4 THD+N = 1%
NOISE FLOOR FFT
+0
OUTPUT SPECTRUM
+0
-20
-20
-40
-40
-60 dBV -80 -92.57 -97.27 -120
dBV
-60 -76.8 -100 -120 -140 20
-140 20 50 100 200 500 .973k 2k 5k 10k 16.11k
50
100
200
500 1k 2k Frequency (Hz)
2.92k
5k
10k
20k
Frequency (Hz)
VIN = 15V RL = 4 10Hz - 22 kHz Bandwidth A - weighted
VIN = 15V RL = 4 fIN = 1kHz PO = 1W RMS SNR = 81 dBr 10Hz - 22kHz Bandwidth A - weighted
GRAPHS GRAPHS
Copyright 2000 Rev. 1.3a, 2002-05-03
Microsemi
Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 8
AudioMAXTM
INTEGRATED PRODUCTS
LX1710/1711
Class-D Mono Power Amplifier Controller IC
PRODUCTION
MECHANICAL DIMINSIONS
W W W.Microsemi .COM
32 1
D
DIM
E P
F
B
H
A
G
L
C
M
A B C D E F G H L M P *LC
Millimeters MIN MAX 1.65 1.85 0.25 0.38 0.13 0.22 9.90 10.50 5.00 5.60 0.65 BSC 0.05 0.21 1.73 2.00 0.65 0.95 0 8 7.65 7.90 0.10
Inches MIN MAX 0.065 0.073 0.009 0.015 0.005 0.008 0.390 0.413 0.197 0.221 .0025 BSC 0.002 0.008 0.068 0.078 0.025 0.037 0 8 0.301 0.311 0.004
*Lead Coplanarity
Note:
1. 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.
MECHANICALS MECHANICALS
Copyright 2000 Rev. 1.3a, 2002-05-03
Microsemi
Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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