lxe1721 e valuation b oard u ser g uide microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 1 copyright ? 2000 rev. 0.3, 2001-10-19 lxe1721 audiomax evaluation kit user?s guide l infinity d ivision
lxe1721 e valuation b oard u ser g uide microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 2 copyright ? 2000 rev. 0.3, 2001-10-19 lxe1721 evaluation board quick start guide the lxe1721 evaluation board is a fully functional stereo class-d amplifier. connection to a single output power supply, two speakers, and an audio source is all that is required to begin evaluating the amplifier. board setting 1. power and ground connections: the terminal jp1 is for the power supply connection. vcc is connected to the positive polarity of the power supply or battery (+7v ~ +15v); the gnd is connected to the negative polarity of the power supply or battery. please make sure your power supply polarity connection and supply voltage is correct before you begun to evaluate the board. 2. speaker connections: jp5 and jp6 are the speaker outputs. jp5 is for the left channel (ch1) and jp6 is for the right channel (ch2). connect speaker ?+? and ?-? to ?lout+/rout+? and ?lout-/rout-? of jp5/jp6. this evaluation board is designed for standard 4 ohm speaker loads. for different impedance speakers, the output frequency response is not optimized unless the lc filter design is modified. for speaker impedance of less than 4 ohms, care must be exercised to prevent from overdriving the amplifier system. this could result in inductor saturation if the output current is too high and further cause damage to the mosfets. a power supply set at 6a current limit is recommended. 3. audio input connections: jp2, jp2a, rca1 and rca2 are the audio input connections. jp2/jp2a support differential audio inputs, and rca1/rca2 are for single-ended audio inputs. when audio inputs are differential, the positive audio inputs are connected to lin+/rin+ pin, while the negative inputs are connected to lin-/rin- pin of the jp2/jp2a terminals. j1 and j2 jumpers are left open when using differential inputs. when audio inputs are single-ended, the audio source can either be connected to terminal jp2/jp2a, or to rca inputs rca1/rca2. in the single-ended configuration, jumpers j1 and j2 must be closed so that the lin-/rin- audio inputs are connected to ground. 4. sleep/mute connections: jp4 is the jumper terminal to select on/off control for sleep and mute functions. to enable the amplifier, both jumpers should be set to ?off? (sleep is off, and mute is off). 5. pre-amp output connections: jp3 is the header for stereo, single-ended pre-amp outputs, ?lpreout ? gnd ? rpreout?. these outputs are provided to drive other crossover networks or to support additional power amplifiers such as for a subwoofer speaker system.
lxe1721 e valuation b oard u ser g uide microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 3 copyright ? 2000 rev. 0.3, 2001-10-19 app app app application schematic lication schematic lication schematic lication schematic rfbk+ rn- gnd r11 5.1/1w vcc jp2a header 2 1 2 as possible, directly from r7 pin risn as possible, directly from r6 pin lfbk- lpreout c7 100pf rin- pgnd ln+ c33 0.68uf/50v pgnd r3 10k q1a si4558dy q2b si4558dy c19 0.1uf/25v lpwm- c32 0.68uf/50v c25 220pf rfbk- c9 18pf chassis_gnd off lin- q3a si4558dy c10 150pf lin+ jp5 te mi n a l 2 1 2 rfbk+ jp4 header 3x2 12 34 56 c22 0.1uf/25v c6 0.47uf c31 0.47uf/50v + c1 1000uf/25v r23 10k rca2 rca jack 1 vcc c21 47uf/25v r10 5.1/1w q1b si4558dy jp6 te mi n a l 2 1 2 q3b si4558dy l4 15uh c3 0.47uf c8 0.1uf/25v 4. heatsink need to be solded on the pgnd plate; vcc pgnd c37 0.1uf/25v c5 0.47uf on off cpwm c29 0.68uf/50v rca1 rca jack 1 c4 0.47uf r13 5.1/1w r15 5.1/1w cn rpreout vcc q4a si4558dy l1 15uh lout+ lfbk- c12 150pf c20 4.7uf/25v,tant c35 0.1uf/25v jp1 temi na l 2 1 2 5. lpwm+,lpwm-,rpwm+,rpwm- must be kept as short as possible. lfbk+ c28 220pf r4 56.2k 1% r19 24.3k 1% r14 5.1/1w vcc pgnd lin+ + c18 47uf/25v rin- rpwm+ c34 0.47uf/50v j2 jumper 1 2 6. chassis gnd circles the whole board on bothe top layer and bottom layer. vcc r9 5.1/1w pgnd jp3 header 3 rin+ jp7 header 2 1 2 ln- lisn rpwm- c36 0.1uf/25v lxb1721 v2.2 custom 11 tuesday, june 19, 2001 lx1721 stereo class-d audio amplifier evaluation board title size document number rev date: sheet of pgnd r21 15/1w rfbk- 3. red havey line means needing heavy duty trace or copper lout- q2a si4558dy lfbk+ lisn r2 56.2k 1% c27 220pf pgnd l100 ferrite/sm r18 24.3k 1% j1 jumper 1 2 r6 0.020/1w r5 34.8k 1% c11 18pf these traces keep as short as posible. vcc rout+ u1 lx1721cdb 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 lfaout cpwm rpwm _lmute leaout leain vref clock gnd v25 lin+ lin- lampout rin+ rin- rampout sleep status _rmute reain reaout rfaout rfbk- rfbk+ risn nc pvdd cp pgnd rn+ rp+ rp- rn- ln- lp- lp+ ln+ pgnd pvdd cn vdd lisn lfbk+ lfbk- vcc r16 24.3k 1% 2. pgnd and gnd plate is expected, they are devided by the center of lx1721 rin+ c30 0.68uf/50v pgnd c17 4.7uf/25v,tant l3 15uh vcc pgnd lpwm+ vcc lp- r8 5.1/1w gnd clock r22 10k r20 15/1w c13 c2 0.1uf/25v r12 5.1/1w rp- rout- rp+ q4b si4558dy l2 15uh mute lin- c26 220pf chassis_gnd g1 chassis_gnd linfinity microelectronics cn risn on c38 0.1uf/25v r7 0.020/1w rn+ r1 10k jp2 header 2 1 2 sleep lp+ r17 24.3k 1% f igure 1 - lxe1721 s chematic
lxe1721 e valuation b oard u ser g uide microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 4 copyright ? 2000 rev. 0.3, 2001-10-19 application schemati application schemati application schemati application schematic (continued) c (continued) c (continued) c (continued) rn- gnd r11 5.1/1w vcc jp2a header 2 1 2 keep this trace as short as possible, directly from r7 pin risn keep this trace as short as possible, directly from r6 pin lpreout c7 100pf rin- pgnd ln+ pgnd r3 10k q1a si4558dy q2b si4558dy c19 0.1uf/25v lpwm- c9 18pf off lin- q3a si4558dy c10 150pf lin+ rfbk+ jp4 header 3x2 12 34 56 c22 0.1uf/25v c6 0.47uf + c1 1000uf/25v r23 10k rca2 rca jack 1 vcc c21 47uf/25v r10 5.1/1w q1b si4558dy q3b si4558dy c3 0.47uf c8 0.1uf/25v vcc pgnd c5 0.47uf on off cpwm rca1 rca jack 1 c4 0.47uf r13 5.1/1w r15 5.1/1w cn rpreout vcc q4a si4558dy lfbk- c12 150pf c20 4.7uf/25v,tant jp1 te m i n a l 2 1 2 r4 56.2k 1% r14 5.1/1w vcc pgnd lin+ + c18 47uf/25v rin- rpwm+ j2 jumper 1 2 vcc r9 5.1/1w jp3 header 3 rin+ jp7 header 2 1 2 ln- lisn rpwm- rfbk- q2a si4558dy lfbk+ lisn r2 56.2k 1% pgnd l100 ferrite/sm j1 jumper 1 2 r6 0.020/1w r5 34.8k 1% c11 18pf these traces keep as short as posible. vcc u1 lx1721cdb 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 lfaout cpwm rpwm _lmute leaout leain vref clock gnd v25 lin+ lin- lampout rin+ rin- rampout sleep status _rmute reain reaout rfaout rfbk- rfbk+ risn nc pvdd cp pgnd rn+ rp+ rp- rn- ln- lp- lp+ ln+ pgnd pvdd cn vdd lisn lfbk+ lfbk- vcc rin+ pgnd c17 4.7uf/25v,tant vcc pgnd lpwm+ vcc lp- r8 5.1/1w gnd clock r22 10k c13 1uf/10v,tant c2 0.1uf/25v r12 5.1/1w rp- rp+ q4b si4558dy mute lin- g1 chassis_gnd cn risn on r7 0.020/1w rn+ r1 10k jp2 header 2 1 2 sleep lp+ f igure 1 a - lxe1721 s chematic (v iew of lx1721 s ection )
lxe1721 e valuation b oard u ser g uide microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 5 copyright ? 2000 rev. 0.3, 2001-10-19 application schemati application schemati application schemati application schematic (continued) c (continued) c (continued) c (continued) rfbk+ lfbk- c33 0.68uf/50v q1a si4558dy q2b si4558dy lpwm- c32 0.68uf/50v c25 220pf rfbk- chassis_gnd q3a si4558dy jp5 temi n al 2 1 2 c31 0.47uf/50v q1b si4558dy jp6 temi n al 2 1 2 q3b si4558dy l4 15uh 4. heatsink need to be solded on the pgnd plate; c37 0.1uf/25v c29 0.68uf/50v q4a si4558dy l1 15uh lout+ c35 0.1uf/25v 5. lpwm+,lpwm-,rpwm+,rpwm- must be kept as short as possible. lfbk+ c28 220pf r19 24.3k 1% rpwm+ c34 0.47uf/50v 6. chassis gnd circles the whole board on bothe top layer and bottom layer. pgnd rpwm- c36 0.1uf/25v lxb1721 v2.2 custom 11 tuesday, june 19, 2001 lx1721 stereo class-d audio amplifier evaluation board ti t l e size document number rev date: sheet of pgnd r21 15/1w 1. star connection is expected for pgnd; 3. red havey line means needing heavy duty trace or copper lout- q2a si4558dy c27 220pf r18 24.3k 1% rout+ r16 24.3k 1% 2. pgnd and gnd plate is expected, they are devided by the center of lx1721 c30 0.68uf/50v l3 15uh lpwm+ r20 15/1w rout- q4b si4558dy l2 15uh c26 220pf chassis_gnd linfinity microelectronics c38 0.1uf/25v r17 24.3k 1% f igure 1 b - lxe1721 s chematic (v iew of o utput s ection )
lxe1721 e valuation b oard u ser g uide microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 6 copyright ? 2000 rev. 0.3, 2001-10-19 bill of materials bill of materials bill of materials bill of materials miscellaneous compon miscellaneous compon miscellaneous compon miscellaneous components ents ents ents line item part description manufacturer & part # case reference designators qty 1 ic, controller l infinity lx1721cdb qsop 44 u1 1 2 ic, n & p ? channel mosfet s iliconix si4558dy so-8 q1, q2, q3, q4 4 3 ferrite bead, 1000 ohm m urata blm41p102sgpt 1206 l100 1 4 printed circuit board l infinity lxe1721 dc2601 rev. 1 5 inductor, 15uh isi # rl622-150k th l1, l2, l3, l4 4 6 phono jack, 90 nickel plated, white m ouser 161-4214 th rca1 1 7 phono jack, 90 nickel plated, red m ouser 161-4215 th rca2 1 8 header, str. .100? center, 2pos a mp 87220-2 th j1, j2, jp2, jp2a, jp7 5 9 header, str. .100? center, 3pos a mp 87220-3 th jp3 1 10 header, double row .100? center, 6pos th jp4 1 11 shorting jumpers, open top, black 3m 929950-00 a mp 531220-7 s ullins stc02syan th j1, j2 2 12 terminal block 2pos 5mm b lock m aster 301-021-1000 th jp1, jp5, jp6 3 13 heat sink low-cost for dip w akefield 651b smt 4 14 epoxy, thermal conductive w akefield 156k capacitors capacitors capacitors capacitors line item part description manufacturer & part # case reference designators qty 1 capacitor, cog, 18pf, 50v, 5% n ovacap 0805n180j500nt avx 08055c180jat2a 0805 c9, c11 2 2 capacitor, cog, 100pf, 50v, 5% n ovacap 0805n101j500nt avx 08055c101jat2a 0805 c7 1 3 capacitor, cog, 150pf, 50v, 5% n ovacap 0805n151j500nt avx 08055c151jat2a 0805 c10, c12 2 4 capacitor, cog, 220pf, 100v, 5% avx 08055c221jat2a 0805 c25, c26, c27, c28 4 5 capacitor, x7r, 100nf, 50v, 20% avx 08055c104mat2a n ovacap 0805b104m500nt s amsung cl21b104mbnc 0805 c2, c8, c16, c19, c22, c35, c36, c37, c38 9 6 capacitor, tant 1f, 25v, 10% k emet t491a105k025as 3216 c13 1 7 capacitor, tant 4.7f, 16v, 20% k emet t491a475m016as avx taja475m016r 3216 c17, c20 2 8 capacitor, stacked mf 0.47f, 50v, 5% p anasonic ecq-v1h474jl th c3, c4, c5, c6, c31, c34 6 9 capacitor, stacked mf 0.68f, 50v, 5% p anasonic ecq-v1h684jl th c29, c30, c32, c33 4 10 capacitor, alum elect. 47f, 50v p anasonic eca-1hm470i th c18, c21 2 11 capacitor, alum elect. 1000f, 25v p anasonic eeu-fc1e102 th c1 1 resistors resistors resistors resistors line item part description manufacturer & part # case reference designators qty 1 resistor, 10k, 5%, 1/8w asj cr21j103t 0805 r1, r3, r22, r23 4 2 resistor, 24.3k, 1%, 1/8w asj cr21f2432t 0805 r16, r17, r18, r19 4 3 resistor, 34.8k, 1%, 1/8w asj cr21f3482t 0805 r5 1 4 resistor, 56.2k, 1%, 1/8w asj cr21f5622t 0805 r2, r4 2 5 resistor, 5.1 ohm, 5%, 1w koa rm73b3a5r1j r ohm mcr100jzhj5r1 2512 r8, r9, r10, r11, r12, r13, r14, r15 8 6 resistor 15 ohm, 5%, 1w koa rm73b3a150j r ohm mcr100jzhj150 2512 r20, r21 2 7 resistor, low value flat .020 irc lr2010-01-r0200-f 2512 r6, r7 2
lxe1721 e valuation b oard u ser g uide microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 7 copyright ? 2000 rev. 0.3, 2001-10-19 board layout board layout board layout board layout f igure 2 - c omponents l ayer l ayout f igure 3 - s older l ayer l ayout inr+ inr- r rca in inl- inl+ l rca in r preout lpreout agnd c10 c11 c12 c19 c22 c27 c35 c37 c38 c8 c9 l1 l2 l3 r1 r10 r11 r12 r13 r14 r16 r17 r2 r3 r4 r6 r7 r9 u1 c1 jp2 jp2a c13 c28 l4 r8 f igure 4 - lxe1721 c omponents p lacement
lxe1721 e valuation b oard u ser g uide microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 8 copyright ? 2000 rev. 0.3, 2001-10-19 absolute maximum rat absolute maximum rat absolute maximum rat absolute maximum ratings ings ings ings unless otherwise specified, the following specifications apply over the operating ambient temperature 0 c t a 70 c lx1721 parameter symbol test conditions min typ max units supply voltage vcc 7 15 v supply current idd vcc=15v 6 a quiescent current iq vcc=15v, output open 75 ma sleep, status vcc = 15v -0.3 vcc + 0.3 v rpwm,cpwm, mute vcc = 15v -0.3 vcc + 0.3 v lin+, lin-, rin+, rin- vin vcc = 15v -0.3 vcc +0.3 v lpreout, rpreout vpre vcc = 15v -0.3 vcc +0.3 v clock frequency fosc vcc = 15v 250 330 500 khz
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