AudioMAX™ I N T E G R A T E D P R O D U C T S LX1710/1711 Class-D Mono Power Amplifier Controller IC P RODUCTION KEY FEATURES DESCRIPTION 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 (2Ω, 4Ω, 8Ω). 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 WWW . Microsemi .C OM 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 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, 4Ω) Maximum Efficiency 80%-85% Output Power >50Wrms (LX1711, 4Ω, 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 Class-D Amplifier Efficiency Comparison 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 LX1710/1711 PACKAGE ORDER INFO Copyright 2000 Rev. 1.4, 2003-05-06 TJ (°C) VDD -20 to 70 7V-15V 7V-25V DB Plastic SSOP 28-PIN LX1710CDB LX1711CDB Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 AudioMAX™ I N T E G R A T E D P R O D U C T S LX1710/1711 Class-D Mono Power Amplifier Controller IC P RODUCTION DB PACKAGE PIN OUT PACKAGE THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA VREF GND N.C. V25 RPW M CPW M INPUT+ INPUTINAMPOUT SLEEP MUTE STATUS EAIN EAOUT 50°C/W 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. 28 14 15 CLOCK ISCP VDD PVDD P+ N+ NPPGND CN FBKFBK+ FAOUT WWW . Microsemi .C OM THERMAL DATA DESCRIPTION (CONTINUED) The mono output controller is available in either an LX1711 high power version (>50Wrms, 4Ω) 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 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. FUNCTIONAL PIN DESCRIPTION Description Pin Name VREF GND N.C. V25 RPWM CPWM INPUT+ INPUT INAMPOUT SLEEP MUTE STATUS EAIN EAOUT 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 FAOUT FBK+ FBKCN PGND PNN+ P+ PVDD VDD CP IS CLOCK Copyright 2000 Rev. 1.4, 2003-05-06 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 Output Driver Supply Voltage Analog Supply Voltage Supply Decoupling for PFET Drivers Current Limit Sense Input Input / Output Clock for Synch Operation Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 2 PACKAGE DATA Pin Name AudioMAX™ I N T E G R A T E D P R O D U C T S LX1710/1711 Class-D Mono Power Amplifier Controller IC P RODUCTION ABSOLUTE MAXIMUM RATINGS 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. WWW . Microsemi .C OM 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 ELECTRICAL CHARACTERISTICS Unless otherwise specified, the following specifications apply over the operating ambient temperature -20°C < TA < 70°C (NOTE 2). Test conditions: RPWM = 49.9k, CPWM = 100pF, VDD = PVDD = 15V Parameter Symbol Test Conditions LX1710 / 1711 Min Typ. Max Units Evaluation Module (See Figure 2) Supply Voltage LX1710 LX1711 Power Supply Rejection Ratio Output Power PSRR PO 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 THD+N SNR FOSC ICHG IDIS VPK VVAL Copyright 2000 Rev. 1.4, 2003-05-06 VIO AOL UGBW VOH VOL IIN VOH VIN = 15V, VRIPPLE = 1VRMS, 10Hz to 10kHz VIN = 15V, RL=4Ω, THD+N=1%, 10Hz to 22kHz VIN = 25V, RL=4Ω, THD+N=1%, 10Hz to 22kHz VIN = 15V, fIN = 1kHz, PO = 10W 15 25 -70 dB 25 W 54 82 VIN = 15V, fIN = 1kHz, PO = 20W 85 fIN = 1kHz, PO = 1W .05 fIN = 20Hz to 20kHz, PO = 1W % .3 RL = 4Ω, PO = 1W (varies with VDD pin voltage) (varies with VDD pin voltage) (varies with VDD pin voltage) (varies with VDD pin voltage) VDD = 8V to 25V O O TA = 0 C to 70 C O O TA = -40 C to 125 C dBr 335 -110 110 3.4 1.6 0.6 1.0 1.5 kHz µA µA V V % % % 2 2 50 ‘mV dB ‘mHz V ‘mV 1 µA 3.535 V/V V VREF –1 VIN = 1V to VREF Set by Internal Resistors IOUT = -100µA 3.465 3.85 Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 % 81 5 60 7 IOUT = -100µA IOUT = +100µA V 3.5 Page 3 ELECTRICALS 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 7 7 VDD AudioMAX™ I N T E G R A T E D LX1710/1711 Class-D Mono Power Amplifier Controller IC P R O D U C T S P RODUCTION ELECTRICAL CHARACTERISTICS (CONTINUED) Symbol Output Voltage, Low Input Impedance VOL Test Conditions Min LX1710 / 1711 Typ. Max IOUT = +100µA Units 1.3 ‘mV ‘kΩ 93 58 ‘mV/V ‘mV/V 42 Feedback Amplifier Stage Gain LX1710 LX1711 Set by Internal Resistors Set by Internal Resistors 89 56 91 57 Input Impedance 388 kΩ Current Limit Comparator Voltage Sense Threshold 190 210 Blanking Pulse Delay 230 mV 500 Response Time IUM Pulses required to Current Limit Latch Consecutive Clear Pulses required to reset IUM counter Reference Voltage Section Initial Accuracy Voltage Stability Excluding blanking pulse O Line Regulation Load Regulation Under voltage Lockout Section Start Threshold Voltage UV Lockout Hysteresis UVLO Delay To Output Enable Supply Current Sleep Current 9 9 ‘cycles 2 2 2 ‘cycles ± 50 5 10 ‘mV ‘mV ‘mV ‘mV ‘mV 5.000 ± 25 2 4 0.5 5 O 0.5 6.5 6.5 62,500 V V clkcyc 25 µA O SLEEP Input = 0V, TA = 25 C SLEEP Input = 2V, VIN = 15V, No MOSFETs connected Operating Current 5.0 ‘mA 1.2 62,500 1.45 1.6 clkcyc V 1.6 1.7 1.8 V ISINK = 3mA ISINK = 75mA ISOURCE = 3mA, CN = 5.2V applied externally ISOURCE = 75mA, CN = 5.2V applied externally 30 1.5 100 2.0 ‘mV V 30 100 ‘mV 1.5 2.0 V ISINK = 3mA ISINK = 75mA ISOURCE = 3mA, CP = 5.2V (applied externally) ISOURCE = 75mA, CP = 5.2V (applied externally) 30 1 100 1.5 ‘mV V 30 100 ‘mV 1 1.5 V Sleep to Output Enable Sleep Threshold Mute Section Mute Threshold Output Drivers for N-Channel MOSFETs NFET Drivers, Low Level Voltage VOL NFET Drivers, High Level Voltage VOH ‘ns 9 TA = 0 C to 70 C O O TA = -40 C to 125 C VDD = 9V to 15V IOUT = 0 to 20mA Temperature Stability ‘ns 250 2.9 WWW . Microsemi .C OM Parameter Output Drives For P-Channel MOSFETs VOL PFET Drivers, High Level Voltage VOH Note 2: The LX1710 / 11CDB is guaranteed to meet performance specifications from 0°C to 70°C. Specifications over the -20°C to 0°C operation temperature range are assured by design, characterization, and statistical process control. Copyright 2000 Rev. 1.4, 2003-05-06 Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 4 ELECTRICALS PFET Drivers, Low Level Voltage AudioMAX™ I N T E G R A T E D LX1710/1711 Class-D Mono Power Amplifier Controller IC P R O D U C T S P RODUCTION WWW . Microsemi .C OM BLOCK DIAGRAM LX1710/11 SIMPLIFIED BLOCK DIAGRAM VDD IS- 10 SLEEP 25 27 CLOCK 28 RPW M 5 CPW M 6 UVLO & REFERENCE PVDD + - SYNC 5V Reference 220m V 1 VREF 4 V25 18 CN 24 PVDD 26 CP 23 P+ 22 N+ 21 N- 20 P- CLK OSC 5V Reference CURRENT SENSE EAOUT 14 EAIN 13 FAULT TIMER INAMPOUT 9 INPUT - 8 INPUT + 7 OUTPUT DRIVERS & LOGIC ERROR AMP CLK S Q R Q 15 FAOUT MUTE MUX INPUT AMP MUTE MUTE 17 FBK- 16 FBK+ FEEDBACK AMP 11 Figure 1 - LX1710 Block Diagram APPLICATION INFORMATION 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. Copyright 2000 Rev. 1.4, 2003-05-06 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: Frequency = 1 (0.577)( RPWM )(CPWM ) + 320ns Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 5 BLOCK DIAGRAM Frequency Synchronization AudioMAX™ I N T E G R A T E D LX1710/1711 Class-D Mono Power Amplifier Controller IC P R O D U C T S P RODUCTION WWW . Microsemi .C OM TYPICAL APPLICATION VIN7V to 15V C9 0.1µF 35V + C22 .1µF C13 + + 2.2µF C11 4.7µF R5 34.8K C1 C16 100pF 1µF * 25 VDD 26 CP 5 RPWM 6 C12 .1µF P+ 23 R12 10 ohm Q1 L1 15µH CPWM 1 VREF N+ 22 V25 LX1710 10 SLEEP MUTE RS1 .037 IS- 27 2 GND SLEEP C17 220µF 25V 24 PVDD 4 C2 1µF CLOCK 28 NC R3 24.3K Q2 R11 10 ohm P- 20 R6 10 ohm C8 .1µF 50V R13 15 ohm 1W C20 .68µF C7 220pF C18 .47µF C21 .68µF Q3 C19 .47µF 11 MUTE AUDIO INPUT NC R8 10K 9 INAMPOUT 7 INPUT+ C3 470nF C26 330pF 8 INPUTR9 10K C14 470nF C5 18pF R1 56.2K C4 150pF 3 14 NC EAOUT 13 EAIN 15 FAOUT N- PGND 19 L2 15µH Q4 21 R10 10 ohm C10 4.7µF R4 24.3K C6 220pF + * CN 18 FBK+ 16 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 Copyright 2000 Rev. 1.4, 2003-05-06 Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 6 AudioMAX™ I N T E G R A T E D LX1710/1711 Class-D Mono Power Amplifier Controller IC P R O D U C T S P RODUCTION 20 10 5 20 10 5 2 2 1 0.5 THD + N (%) THD + N (%) THD+N VS. OUTPUT POWER 100 50 0.23 0.1 0.04 1 0.5 0.26 0.1 0.04 0.02 0.01 0.01 0.005 0.002 0.001 20 0.005 0.002 50 100 200 1.00k 500 2k 5k 7.96k 10k 20k 0.001 Frequency (Hz) 50m 1.13 2 100m 200m 500m 5 10 20 24.56 30 Output Power (W ) VIN = 15V RL = 4Ω PO =1 WRMS VIN = 15V fIN =1 kHz RL = 4Ω FREQUENCY RESPONSE POWER BAND 50 +20 45 +15 2Ω 40 Output Power (W) +10 Voltage Amplification (dBr) WWW . Microsemi .C OM THD+N VS. FREQUENCY 100 50 +5 -0.08 -0.59 -5 35 30 20 10 -15 5 18.2 50 100 200 500 1k 2k 5k 10k 17.88k 50k 80k 8Ω 15 -10 -20 10 4Ω 25 20 50 100 200 500 1k 2k 5k 10k 20k Frequency (Hz) Frequency (Hz) VIN = 15V THD+N = 1% VIN = 15V RL = 4Ω PO = 1WRMS GRAPHS Copyright 2000 Rev. 1.4, 2003-05-06 Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 7 AudioMAX™ I N T E G R A T E D LX1710/1711 Class-D Mono Power Amplifier Controller IC P R O D U C T S P RODUCTION EFFICIENCY VS. OUTPUT POWER OUTPUT POWER VS. SUPPLY VOLTAGE WWW . Microsemi .C OM 90% 60 85% 50 75% Output Power (W) Efficency (%) 80% 70% 65% 60% 40 30 20 55% 10 50% 45% 0 5 10 15 20 25 0 30 6 Output Power (W) 8Ω 4Ω 11 16 21 26 Supply Voltage (VIN) 2Ω VIN = 15V fIN = 1kHz fIN = 1kHz RL = 4Ω THD+N = 1% NOISE FLOOR FFT OUTPUT SPECTRUM +0 +0 -20 -20 -40 -40 dBV dBV -60 -80 -60 -76.8 -92.57 -97.27 -100 -120 -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) Copyright 2000 Rev. 1.4, 2003-05-06 VIN = 15V RL = 4Ω fIN = 1kHz PO = 1WRMS SNR = 81 dBr 10Hz – 22kHz Bandwidth A - weighted Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 GRAPHS VIN = 15V RL = 4Ω 10Hz – 22 kHz Bandwidth A - weighted Page 8 AudioMAX™ I N T E G R A T E D P R O D U C T S LX1710/1711 Class-D Mono Power Amplifier Controller IC P RODUCTION MECHANICAL DIMINSIONS D F E A B C D E F G H L M P *LC P B A H G L C M Millimeters MAX MIN 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 .025 BSC 0.002 0.008 0.068 0.078 0.025 0.037 0° 8° 0.301 0.311 0.004 WWW . Microsemi .C OM DIM 3 2 1 *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 Copyright 2000 Rev. 1.4, 2003-05-06 Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 9