microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 1 copyright ? 2000 rev. 1.3, 2001-10-17 www. microsemi . com audiomax? lx1710/1711 class-d mono power amplifier controller ic p roduction a microsemi company l infinity description description description description 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 im- proved performance over linfinity?s previous generation amplifier pro- ducts. enhancements include better snr, lower noise floor, and reduced thd. combined with output power mosfet?s and an out p ut 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 amplifie r 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 adjuste d for frequency response, optimized fo r 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 product highlight product highlight product highlight class-d amplifier efficiency comparison key features key features key features key features 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/benefit applications/benefit applications/benefit applications/benefits s s s 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 package order info t j ( c) v dd db plastic ssop 28-pin 7v-15v lx1710cdb 0 to 70 7v-25v LX1711cdb l l x x 1 1 7 7 1 1 0 0 / / 1 1 7 7 1 1 1 1
microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 2 copyright ? 2000 rev. 1.3, 2001-10-17 www. microsemi . com audiomax? lx1710/1711 class-d mono power amplifier controller ic p roduction a microsemi company l infinity description (continu description (continu description (continu description (continued) ed) ed) ed) 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 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 descr functional pin descr functional pin descr functional pin description iption iption iption pin name description pin name description vref 5v reference faout feedback amplifier output gnd low current ground fbk+ feedback amplifier non-inverting input n.c. no connect fbk- feedback amplifier inverting input v25 2.5v reference cn supply decoupling for nfet drivers rpwm pwm resistor connection pgnd output driver high current ground cpwm pwm capacitor connection p- drive for pfet on negative half of bridge input+ positive audio input n- drive for nfet on negative half of bridge input - negative audio input n+ drive for nfet on positive half of bridge inampout input amplifier output p+ drive for pfet on positive half of bridge sleep sleep input (active low) pvdd output driver supply voltage mute mute input (active high) vdd analog supply voltage status uvlo indicator (open collector output) cp supply decoupling for pfet drivers eain inverting input of error amplifier is - current limit sense input eaout error amplifier output clock input / output clock for synch operation thermal data thermal data thermal data thermal data db p ackage thermal resistance - junction to a mbient , ja 50 c/w junction temperature calculation: t j = t a + (p d 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. package pin out package pin out package pin out package pin out inampout 14 28 15 vref gnd n.c. v25 rpwm cpwm input- sleep input+ mute status eain eaout clock is- cp vdd pvdd p+ n- pgnd n+ p- cn fbk- fbk+ faout p p a a c c k k a a g g e e d d a a t t a a
microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 3 copyright ? 2000 rev. 1.3, 2001-10-17 www. microsemi . com audiomax? lx1710/1711 class-d mono power amplifier controller ic p roduction a microsemi company l infinity absolute maximum rat absolute maximum rat absolute maximum rat absolute maximum ratings ings ings ings electrical character electrical character electrical character electrical characteris is is istics tics tics tics 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 lx1710 / 1711 parameter symbol test conditions min typ. max units evaluation module (see figure 2) supply voltage lx1710 7 15 LX1711 v dd 7 25 v power supply rejection ratio psrr v in = 15v, v ripple = 1v rms , 10hz to 10khz -70 db v in = 15v, r l =4 ? , thd+n=1%, 10hz to 22khz 25 output power p o v in = 25v, r l =4 ? , thd+n=1%, 10hz to 22khz 54 w v in = 15v, f in = 1khz, p o = 10w 82 efficiency v in = 15v, f in = 1khz, p o = 20w 85 % f in = 1khz, p o = 1w .05 total harmonic distortion plus noise thd+n f in = 20hz to 20khz, p o = 1w .3 % signal-to-noise ratio snr r l = 4 ? , p o = 1w 81 dbr oscillator section oscillator frequency f osc 335 khz charge current i chg (varies with v dd pin voltage) -110 a discharge current i dis (varies with v dd pin voltage) 110 a oscillator peak voltage v pk (varies with v dd pin voltage) 3.4 v oscillator valley voltage v val (varies with v dd pin voltage) 1.6 v voltage stability v dd = 8v to 25v 0.6 2 % t a = 0 o c to 70 o c 1.0 2 % temperature stability t a = -40 o c to 125 o c 1.5 % error amplifier input offset voltage v io 5 ? mv dc open loop gain a ol 60 db unity gain bandwidth ugbw 7 ? mhz high output voltage v oh i out = -100 a v ref ?1 v low output voltage v ol i out = +100 a 50 ? mv input common mode range input bias current i in v in = 1v to v ref 1 a input amplifier stage gain set by internal resistors 3.465 3.5 3.535 v/v output voltage, high v oh i out = -100 a 3.85 v supply voltage (pvdd, vdd)..................................................................................................... ................................................... -0.3v to 30v sleep, status, fbk+, fbk- ...................................................................................................... ...................................... -0.3v to v dd +0.3v is- ............................................................................................................................ ................................................... pv dd ?2 to pv dd to +0.3v rpwm, cpwm, mute ............................................................................................................... .........................................-0.3v to v ref +0.3v input +, input -, inampout..................................................................................................... .....................................-0.3v to v ref +0.3v eain, eaout, faout ............................................................................................................. ..........................................-0.3v to v ref +0.3v clock .......................................................................................................................... ..........................................................-0.3v to c n +0.3v operating junction temperature plastic (db package) ............................................................................ .................................................. 125 o c storage temperature range ...................................................................................................... ...................................................-65 o c to 150 o c lead temperature (soldering, 10 seconds)....................................................................................... ..........................................................300 o c n ote 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. e e l l e e c c t t r r i i c c a a l l s s
microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 4 copyright ? 2000 rev. 1.3, 2001-10-17 www. microsemi . com audiomax? lx1710/1711 class-d mono power amplifier controller ic p roduction a microsemi company l infinity electrical character electrical character electrical character electrical characteristics istics istics istics (continued) lx1710 / 1711 parameter symbol test conditions min typ. max units output voltage, low v ol i out = +100 a 1.3 ? mv input impedance 42 ? k ? feedback amplifier stage gain lx1710 set by internal resistors 89 91 93 ? mv/v LX1711 set by internal resistors 56 57 58 ? mv/v input impedance 388 k ? current limit comparator voltage sense threshold 190 210 230 mv blanking pulse delay 500 ? ns response time excluding blanking pulse 250 ? ns i um pulses required to current limit latch 9 9 9 ? cycles consecutive clear pulses required to reset i um counter 2 2 2 ? cycles reference voltage section initial accuracy 5.000 voltage stability 25 50 ? mv t a = 0 o c to 70 o c 2 5 ? mv temperature stability t a = -40 o c to 125 o c 4 10 ? mv line regulation v dd = 9v to 15v 0.5 ? mv load regulation i out = 0 to 20ma 5 ? mv under voltage lockout section start threshold voltage 6.5 v uv lockout hysteresis 0.5 6.5 v uvlo delay to output enable 62,500 clkcyc supply current sleep current sleep input = 0v, t a = 25 o c 25 a operating current sleep input = 2v, v in = 15v, no mosfets connected 2.9 5.0 ? mv sleep to output enable 62,500 clkcyc sleep threshold 1.2 1.45 1.6 v mute section mute threshold 1.6 1.7 1.8 v output drivers for n-channel mosfets i sink = 3ma 30 100 ? mv nfet drivers, low level voltage v ol i sink = 75ma 1.5 2.0 v i source = 3ma, c n = 5.2v applied externally 30 100 ? mv nfet drivers, high level voltage v oh i source = 75ma, c n = 5.2v applied externally 1.5 2.0 v output drives for p-channel mosfets i sink = 3ma 30 100 ? mv pfet drivers, low level voltage v ol i sink = 75ma 1 1.5 v i source = 3ma, c p = 5.2v (applied externally) 30 100 ? mv pfet drivers, high level voltage v oh i source = 75ma, c p = 5.2v (applied externally) 1 1.5 v e e l l e e c c t t r r i i c c a a l l s s
microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 5 copyright ? 2000 rev. 1.3, 2001-10-17 www. microsemi . com audiomax? lx1710/1711 class-d mono power amplifier controller ic p roduction a microsemi company l infinity block diagram block diagram block diagram block diagram sleep vref v25 cn pvdd cp p+ n+ p- n- faout fbk- fbk+ vdd is- clock rpwm cpwm eaout eain inampout input - input + mute uvlo & reference output drivers & logic fault timer 5v reference 26 4 1 10 clk osc sync + - 220mv pvdd mux mute mute 7 14 13 9 11 8 6 5 28 27 25 15 17 feedback amp error amp current sense input amp 16 24 23 22 21 20 lx1710/11 simplified block diagram s r q q clk 5v reference 18 figure 1 - lx1710 block diagram application informat application informat application informat application information ion ion ion 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 r pwm and c pwm as usual. additional units will be slave units, and their oscillators will be disabled by leaving the r pwm pin disconnected. the clock pin and the c pwm pin of the slave units should be tied to the clock pin and the c pwm 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 c pwm 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 (r pwm and c pwm selection) the oscillator is programmed by the external timing components r pwm and c pwm . for a nominal frequency of 333khz, r pwm and c pwm 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: ns c r pwm pwm 320 ) )( )( 577 . 0 ( 1 frequency + = b b l l o o c c k k d d i i a a g g r r a a m m
microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 6 copyright ? 2000 rev. 1.3, 2001-10-17 www. microsemi . com audiomax? lx1710/1711 class-d mono power amplifier controller ic p roduction a microsemi company l infinity typical application typical application typical application typical application vdd pvdd cp rpwm cpwm vref v25 gnd sleep mute inampout input+ input- eaout eain faout status clock p+ pgnd cn fbk+ fbk- n+ p- n- is- r5 34.8k r1 56.2k r2 10k c11 4.7f c3 470nf c14 470nf c4 150pf c5 18pf r8 10k r9 10k c26 330pf c2 1f c1 1f c16 100pf mute sleep v in 7v to 15v c22 .1f r11 10 ohm r6 10 ohm r10 10 ohm r12 10 ohm q3 q2 q4 c8 .1f 50v rs1 .0347 c17 220f 25v q1 c12 .1f c10 4.7f r13 15 ohm 1w l1 15h l2 15h c20 .68f c21 .68f c19 .47f c18 .47f r3 24.3k c7 220pf r4 24.3k c6 220pf lx1710 nc nc audio input nc 25 24 26 5 6 1 4 2 10 11 9 7 8 14 13 15 28 27 23 22 20 21 19 18 16 17 12 nc 3 c9 0.1f 35v c13 2.2f + + + + figure 2 ? typical class-d switching amplifier circuit application a a p p p p l l i i c c a a t t i i o o n n s s
microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 7 copyright ? 2000 rev. 1.3, 2001-10-17 www. microsemi . com audiomax? lx1710/1711 class-d mono power amplifier controller ic p roduction a microsemi company l infinity thd+n vs. frequency thd+n vs. frequency thd+n vs. frequency thd+n vs. frequency thd+n vs. output pow thd+n vs. output pow thd+n vs. output pow thd+n vs. output power er er er 20 20k 50 100 200 500 2k 5k 10k 7.96k 1.00k frequency (hz) 0.001 100 0.002 0.005 0.01 0.1 0.5 1 2 5 10 20 50 thd + n (%) 0.04 0.23 0.001 100 0.002 0.005 0.01 0.02 0.1 0.5 1 2 5 10 20 50 0.26 0.04 thd + n (%) 50m 30 100m 200m 500m 2 5 10 20 24.56 1.13 output power (w) v in = 15v r l = 4 ? p o =1 w rms v in = 15v f in =1 khz r l = 4 ? frequency response frequency response frequency response frequency response power band power band power band power band -20 +20 -15 -10 -5 +5 +10 +15 -0.08 -0.59 voltage amplification (dbr) 10 80k 50 100 200 500 1k 2k 5k 10k 50k 17.88k 18.2 frequency (hz) 5 5 0 1 0 1 5 2 0 2 5 3 0 3 5 4 0 4 5 output power (w) 20 20 k 50 100 200 500 1k 2k 5k 10k frequency (hz) 2 ? 4 ? 8 ? v in = 15v r l = 4 ? p o = 1w rms v in = 15v thd+n = 1% g g r r a a p p h h s s
microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 8 copyright ? 2000 rev. 1.3, 2001-10-17 www. microsemi . com audiomax? lx1710/1711 class-d mono power amplifier controller ic p roduction a microsemi company l infinity efficiency vs. outpu efficiency vs. outpu efficiency vs. outpu efficiency vs. output power t power t power t power output power vs. sup output power vs. sup output power vs. sup output power vs. supply voltage ply voltage ply voltage ply voltage 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 0 5 10 15 20 25 30 output power (w) efficency (%) 8 ? 4 ? 2 ? 0 10 20 30 40 50 60 6 11162126 supply voltage (v in ) output power (w) v in = 15v f in = 1khz f in = 1khz r l = 4 ? thd+n = 1% noise floor fft noise floor fft noise floor fft noise floor fft output spectrum output spectrum output spectrum output spectrum -14 0 + 0 -12 0 -8 0 -6 0 -4 0 -2 0 - 92.57 -97.27 dbv 20 50 100 200 500 2k 5k 10k 16.11k .973k frequency (hz) -140 +0 -120 -100 -60 -40 -20 -76.8 dbv 20 20k 50 100 200 500 1k 2k 5k 10k 2.92k frequency (hz) v in = 15v r l = 4 ? 10hz ? 22 khz bandwidth a - weighted v in = 15v r l = 4 ? f in = 1khz p o = 1w rms snr = 81 dbr 10hz ? 22khz bandwidth a - weighted g g r r a a p p h h s s
microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 9 copyright ? 2000 rev. 1.3, 2001-10-17 www. microsemi . com audiomax? lx1710/1711 class-d mono power amplifier controller ic p roduction a microsemi company l infinity mechanical diminsion mechanical diminsion mechanical diminsion mechanical diminsions s s s f p e d a h b c 1 2 3 g l m millimeters inches dim m in m ax m in m ax a 1.65 1.85 0.065 0.073 b 0.25 0.38 0.009 0.015 c 0.13 0.22 0.005 0.008 d 9.90 10.50 0.390 0.413 e 5.00 5.60 0.197 0.221 f 0.65 bsc .0025 bsc g 0.05 0.21 0.002 0.008 h 1.73 2.00 0.068 0.078 l 0.65 0.95 0.025 0.037 m 0 8 0 8 p 7.65 7.90 0.301 0.311 *lc 0.10 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. m m e e c c h h a a n n i i c c a a l l s s
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