lxe1710 / 1711 e valuation b oard u ser g uide microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 1 copyright ? 2000 rev. 1.2b, 2002-05-03 lxe1710/1711 audioma lxe1710/1711 audioma lxe1710/1711 audioma lxe1710/1711 audiomax x x x evaluation kit evaluation kit evaluation kit evaluation kit user?s guide user?s guide user?s guide user?s guide integrated products
lxe1710 / 1711 e valuation b oard u ser g uide microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 2 copyright ? 2000 rev. 1.2b, 2002-05-03 i ntroducing lx1710/1711 a udio max thank you for your interest in the latest generation of audiomax products. the lxe1710/1711 evaluation board is a fully functional mono amplifier designed to demonstrate the ?new and improved? switching class-d power amplifier ic from linfinity microsemi. the lx1710/1711 is a completely new controller design with superior performance over the lx1720 stereo controller ic. key improvements include better snr, lower noise floor, and reduced thd therefore resulting in a much ?quieter? and ?cleaner? sounding amplifier. the evaluation board has been configured with easy-to-use terminal block connections for power supply/battery hook up and speaker connections. an rca jack or separate audio +/- pins allow a quick interface to your audio source. jumpers are also provided to enable/disable the amplifier (sleep control) and to turn off the audio input (mute control). with minimal setup, the user can be listening to the amplifier in a matter of a few minutes. both the lx1710 and lx1711 operate from a single supply voltage. the lxe1710 evaluation board can accommodate a supply voltage from 7v to 15v which produces 25w into 4 ? and greater than 40w into 2 ? . the lx1711 can handle a higher supply voltage (7v to 25v) and provides greater than 50w continuous output power into 4 ? . the evaluation amplifier board has been designed for a 4 ? load. the output filter can be easily modified to change frequency response for other load optimization. for information on circuit analysis, design, tradeoffs, and component selection, please see application note an-16 ?audiomax? design resource? thank you again for your interest in the new ?quieter?, high efficiency class-d audio amplifier from linfinity microsemi. please let us know what you think and stay tuned for future product releases to our audiomax family of products. regards, microsemi linfinity division http://www.microsemi.com (714) 898-8121
lxe1710 / 1711 e valuation b oard u ser g uide microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 3 copyright ? 2000 rev. 1.2b, 2002-05-03 t able of c ontents lx1710 / 1710 audiomax evaluation board features and circuit description ..............................4 input compensation output stage filter stage quick start guide ............................................................................................................................... .............5 application schematic ............................................................................................................................... ....6 electrical characteristics ..............................................................................................................................7 performance graphs ............................................................................................................................... .......8 board layout ............................................................................................................................... .....................9 printed circuit board ............................................................................................................................... .....10 bill of materials ............................................................................................................................... ...............11
lxe1710 / 1711 e valuation b oard u ser g uide microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 4 copyright ? 2000 rev. 1.2b, 2002-05-03 part number product description lx1710cdb audiomax high fidelity controller ic v dd = 7v to 15v, switching class-d mono power amplifier ic, 28-pin ssop package. lx1711cdb audiomax high power controller ic v dd = 7v to 25v, switching class-d mono power amplifier ic, 28-pin ssop package. lxe1710 lx1710 audiomax evaluation board fully operational mono audio amplifier. 25w, 4 ? lxe1711 lx1711 audiomax evaluation board fully operational mono audio amplifier. 50w, 4 ? lx1710/1711 a udio max e valuation b oard f eatures and c ircuit d escription ? fully assembled mono evaluation board with class-d controller ic ? improved snr and noise floor performance ? output power of 25w typical (lx1710, 15v dd , 4 ? , 1% thd+n) ? output power of 50w typical (lx1711, 25v dd , 4 ? , 1% thd+n) ? supports full audio bandwidth ? optimized to drive 4 ? speaker load ? terminal block connectors for supply voltage and speaker connection ? rca plug for audio input signal the audiomax evaluation amplifier board allows the user to quickly connect and evaluate the lx1710/1711 switching class-d mono controller ic. easy-to-connect terminal blocks and an rca plug are provided for interfacing to power, speaker, and audio input connections. the single stage output filter has been configured to drive a 4 ? load and support full audio bandwidth amplification (see audio application note for lc filter design component selection, calculations, and suggested inductor and capacitor values for other loads). the evaluation board operates from a single supply voltage. the class-d amplifier controller ic requires a minimal number of external components to create a complete amplifier solution. see evaluation board schematic and bill of materials for circuit specifics. a class-d amplifier is a ?switching? amplifier that converts a low-level, analog audio input signal into a high power, pulse-width modulated (pwm) output. the switching frequency (430khz typical but can be adjusted) is much higher than the audio bandwidth (20hz to 20khz), and is easily filtered out with a simple lc filter. the support circuitry can be generally grouped into three areas (input circuit, output power stage, and output filter). i nput c ompensation the first group is the compensation network and control setting components. these resistors and capacitors set up the controller operating frequency, response characteristics, and comparator ramp fundamental to class-d operation. o utput s tage the next section is the output stage. the controller ic generates a pwm output by controlling external fets connected in a full bridge configuration. the full bridge configuration is connected between the single supply voltage (pvdd) and ground (pgnd) with the output of the bridge driving the lc filter stage. because the fets are either fully ?on? or fully ?off?, class-d topology is extremely efficient (up to 85% typical), circuit power dissipation is minimal, and maximum power is delivered to the speaker. the bridge output also drives the rc low pass filter, which provides the feedback for the control loop through the fbk+ and fbk- inputs. f ilter s tage the single stage, second order lc filter is used to remove the switching frequency. the frequency response and corner frequency can be easily adjusted for optimization of various loads. the lc evaluation board component values have been chosen for a 4 ? load. see section on lc filter design for component selection.
lxe1710 / 1711 e valuation b oard u ser g uide microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 5 copyright ? 2000 rev. 1.2b, 2002-05-03 q uick s tart g uide the lxe1710/1711 evaluation board is a fully functional, class-d amplifier. connection to a single supply voltage (vdd from either a battery or power supply), speakers, and your audio source is all that is required to begin evaluating the amplifier and listening to music. the following outlines the necessary connections and control jumpers. 1) verify contents of evaluation kit: the easy-to- use amplifier is all contained on a single board. visually inspect to see if the board or any components were damaged during shipping. all components are located on the top side of the pcb except for the decoupling capacitor, c17. a copy of the lx1710/1711 datasheet can be downloaded from the microsemi.com website. 2) power and ground connections: the voltage supply and ground connections are made through terminal block tb1. connect your ?+? (+7v to +15v for the lxe1710 or +7v to +25v for the lxe1711) power supply or battery to the +v input of tb1. connect your supply or battery ground to the gnd input of tb1. please ensure the correct positive and ground connections are made before turning on the power supply. 3) speaker connection: the amplifier is designed to drive a single 4 ? speaker. connect speaker ?+? and ?-? to the +out and ?out input of terminal block tb2 respectively. the amplifier can be used to drive other speaker loads but frequency response may not be optimal. see lc filter design section for recommended inductor and capacitor modifications. 4) audio input connection: connect your audio source to the rca jack cn1, audio in. for other type interfaces, the audio input signal can also be connected to the amplifier board using the j3 (in- and in+) location. strip line plugs can be inserted into j3 for connectivity. 5) jumper selection controls: the ?on/off? or enable to the module is controlled with the sleep/ signal. jumper j1 connects the sleep/ to ?on? or ? off?. sleep/ is an active low control. jumper j2 connects the mute control which enables/disables the audio input to the amplifier. mute is an active high signal. see table below. 6) power source: if a power supply is being used, make sure it is set to the correct voltage level and turn the power supply on. 7) audio source: make sure the audio source signal is set to a minimum level. start or ?play? audio source and adjust source volume to desired level. 8) listen to audiomax: if the amplifier is not operating properly, verify preceding steps or contact linfinity for technical assistance (714) 898-8121. jumper toward off jumper toward on jumper floating j1 jumper: sleep/ amplifier enabled (sleep/ is off) amplifier disabled (sleep/ is on) amplifier disabled (sleep/ is on) j2 jumper: mute audio input enabled (mute is off) audio input disabled (mute is on) audio input enabled (mute is off) table 1: jumper settings to power supply +v 7v-15v for lx1710 7v-25v for lx1711 to speaker + to speaker - to power supply ground optional audio in - optional audio in + to audio source
lxe1710 / 1711 e valuation b oard u ser g uide microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 6 copyright ? 2000 rev. 1.2b, 2002-05-03 s chematic 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 + + + + * *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 lxe1710 ? evaluation board schematic
lxe1710 / 1711 e valuation b oard u ser g uide microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 7 copyright ? 2000 rev. 1.2b, 2002-05-03 e lectrical c haracteristics unless otherwise specified, the following specifications apply over the operating ambient temperature 0c lxe1710 / 1711 e valuation b oard u ser g uide microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 8 copyright ? 2000 rev. 1.2b, 2002-05-03 p erformance g raphs 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 (%) 4 ? 0 10 20 30 40 50 60 6 11162126 supply voltage (v in ) output power (w) v in = 15v f in =1khz r l =4 ? thd+n=1% frequency response frequency response frequency response frequency response thd+n vs. output pow thd+n vs. output pow thd+n vs. output pow thd+n vs. output power er er er -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) 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 ? r o =1w rms v in =15v f in =1khz r l =4 ?
lxe1710 / 1711 e valuation b oard u ser g uide microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 9 copyright ? 2000 rev. 1.2b, 2002-05-03 p rinted c ircuit b oard l ayout silkscreen layer cn1 : rca jack a udio in j3 : optional connections audio in +, audio in - tb1 : power supply terminal block +v, gnd j2 : mute jum p e r j1 : sleep jumper tb2 : audio output terminal block + out, - out
lxe1710 / 1711 e valuation b oard u ser g uide microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 10 copyright ? 2000 rev. 1.2b, 2002-05-03 p rinted c ircuit b oard bottom layer top layer
lxe1710 / 1711 e valuation b oard u ser g uide microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 11 copyright ? 2000 rev. 1.2b, 2002-05-03 b ill of m aterials miscellaneous compon miscellaneous compon miscellaneous compon miscellaneous components ents ents ents line item part description manufacturer & part # case reference designators qty 1 controller linfinity lx1710 / lx1711 ssop 28 u1 1 2 n-channel mosfet fairchild fds6612a so-8 q2, q4 2 3 p-channel mosfet fairchild fds4953 so-8 q1, q3 2 4 printed circuit board linfinity sge2758 rev.x 1 isi rl622-150k (lxe1710) th 5 inductor, 15uh coilcraft do5022-153hc (lxe1711) smt l1, l2 2 6 phono jacks, 90 nickel plated, wht mouser 161-4214 th cn1 1 7 strip line plugs, straight, single row .100" ca ca-s36-24b-44 th j1, j2 2 8 shorting jumpers, open top, black mouser 151-8030 th j1 1 9 terminal block 2 pos 5mm block master 301-021-1000 th tb1, tb2 2 capacitors capacitors capacitors capacitors line item part description part description case reference designators qty 1 capacitor, cog, 18pf, 50v, 5% novacap 1206n180j500nt avx 12065c180jat2a 1206 c5 1 2 capacitor, cog, 150pf, 50v, 5% novacap 1206n151j500nt avx 12065c151jat2a 1206 c4 1 3 capacitor, cog, 220pf, 50v, 5% avx 12065c221jat2a 1206 c6, c7 2 4 capacitor, x7r, 330pf, 50v, 10% panasonic ecu-v1h331kbm 1206 c26 1 5 capacitor, x7r, .47uf, 16v, 20% novacap 1206b474m160nt avx 1206yc474mat2a 1206 c3, c14 2 6 capacitor, x7r, 1uf, 50v, 10% novacap 1206b105k500nt avx 12065c105kat2a 1206 c1, c2 2 7 capacitor, cog, 100pf, 50v, 5% novacap 0805n101j500nt avx 08055c101jat2a 0805 c16 1 8 capacitor tant 0.1uf 35v 20% avx taja104m035r 3216 c9 1 9 capacitor tant 2.2uf 25v 20% kemet t491a225m025as 3216 c13 1 10 capacitor, tant, 4.7uf, 16v, 20% kemet t491a475m016as avx taja475m016r 3216 c10, c11 2 11 capacitor stacked mf 0.1uf 50v 5% panasonic ecq-v1h104jl th c8, c12, c22 3 12 capacitor stacked mf 0.47uf 50v 5% panasonic ecq-v1h474jl th c18, c19 2 13 capacitor stacked mf 0.68uf 50v 5% panasonic ecq-v1h684jl th c20, c21 2 14 capacitor, elect 220uf, 25v, 20% elna rv-25v221mh10-r nt c17 1 resistors resistors resistors resistors line item part description part description case reference designators qty 1 resistor, 10k, 5%, 1/4w asj cr32j103t 1206 r2 1 2 resistor, 24.3k, 1%, 1/4w asj cr32f2432t 1206 r3, r4 2 3 resistor, 10 ohm, 5%, 1/8w asj cr j100t 0805 r6, r10, r11, r12 4 4 resistor, 10k, 5%, 1/8w asj cr21j103t 0805 r8, r9 2 5 resistor, 34.8k, 1%, 1/8w asj cr21f3482t 0805 r5 1 6 resistor,20k, 5%, 1/8w asj cr j203t 0805 r7 1 7 resistor, 56.2k, 1%, 1/8w asj cr21f5622t 0805 r1 1 8 resistor, 15 ohm 5% 1w koa rm73b3a150j rohm mcr100jzhj150 2512 r13 1 9 resistor, low value flat .0374 irc lr2010-01-r0374-f 2512 rs1 1
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