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ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 1 ? features ? 8.0v ~ 18.0v power supply. ? high output power capability: 2 x 30w/ 4 ? /btl @16v,1khz,thd+n=10%. 2 x 18w/ 4 ? /btl @12v,1khz,thd+n=10%. 2 x 23w/8 ? /btl @18v,1khz,thd+n=10%. 2 x 18w/8 ? /btl @16v,1khz,thd+n=10%. 2 x 10w/8 ? /btl @12v,1khz,thd+n=10%. 4 x 11w/ 4 ? /se @18v,1khz,thd+n=10%. 4 x 5w/ 4 ? /se @12v,1khz,thd+n=10%. 4 x 6w/8 ? /se @18v,1khz,thd+n=10%. 4 x 3w/8 ? /se @12v,1khz,thd+n=10%. ? 3 kinds of output type options: 4xse 2xbtl 2.1ch.(2xse+1xbtl) ? include high/low pass filter op. ? short-circuit protection with automatic recovery. ? over-heat protection with automatic recovery. ? mute function selectable. ? lead free and green package available. (rohs compliant) ? space saving package : -- 48-pin lqfp 7*7 package. general description the ly8321 is a high efficiency class d audio power amplifier. it can to work either in dual bridge or quad single-ended output and 2.1 channel application configuration. the device features a low noise and a low power consumption in shutdown mode and support thermal shutdown protection . it also utilizes circuitry to reduce low noise during device turn-on. the outputs are also fully protected against short to output-to-output pin. the s hort-circuit protection and thermal protection include an auto-recovery feature. application ? soundbar home theater. ? powered speakers. ? music instrument devices. ? dvd players, game machines. ? multimedia tft lcd tvs / monitors. pin configuration ly8321 lqfp48 pin configuration (top view)
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 2 ? pin description symbol pin no. description bst_a 1 bootstrap i/o for a channel. out_a 2/3 speaker output for a channel.(se mode=vout+) (btl mode=left channel vout+) pvcc 4/5/8/9/28/29/32/33 power supply of a b c d channel. pgnd 6/7/30/31 ground of a b c d channel. out_b 10/11 speaker output for b channel. (se mode=vout+) (btl mode=left channel vout-) bst_b 12 bootstrap i/o for b channel. fb_a 13 a-channel feedback. connect feedback resistor between fb_a and in_a to set amplifier gain. in_a 14 input of a channel. fb_b 15 b-channel feedback. connect feedback resistor between fb_b and in_b to set amplifier gain. in_b 16 input of b channel. bypass 17 bypass pin. agnd 18/19 analog gnd . nc 20 no connect. in_c 21 input of c channel. fb_c 22 c-channel feedback. connect feedback resistor between fb_c and in_c to set amplifier gain. in_d 23 input of d channel. fb_d 24 d-channel feedback. connect feedback resistor between fb_d and in_d to set amplifier gain. bst_c 25 bootstrap i/o for c channel. out_c 26/27 speaker output for c channel. (se mode=vout+) (btl mode=right channel vout+) out_d 34/35 speaker output for d channel. (se mode=vout+) (btl mode=left channel vout-) bst_d 36 bootstrap i/o for d channel. sdb 37 shutdown control pin.(when low level in shutdown mode). mute 38 mute signal for quick enable/disable of output. (when high level in mute mode). avcc 39 analog power supply. vdd 40 regulator output terminal.(with external capacitor) o2 41 pure op output 2. in2 42 pure op negative input 2. o1 43 pure op output 1. in1 44 pure op negative input 1 mode 0/1/2 45/46/47 out put mode selectable. vclamp 48 internally generated voltage power supply for all channel bootstrap capacitors.
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 3 ? ? ordering information ordering code speaker channels pin/ package output power (thd+n=10%) input type output type ly8321f multi channel lqfp48 2 x 30w/ 4 ? /btl @16v *3 2 x 18w/ 4 ? /btl @12v. 2 x 23w/8 ? /btl @18v 2 x 18w/8 ? /btl @16v 2 x 10w/8 ? /btl @12v 4 x 11w/ 4 ? /se @18v *3 4 x 5w/ 4 ? /se @12v 4 x 6w/8 ? /se @18v 4 x 3w/8 ? /se @12v se 4xse 2xbtl 2xse+1xbtl (2.1ch.) (*3) when driving R 14v power supply, the device must be mount ed to the pcb board and increase a large area of copper or recommended to use external heat sink. ? demo board ordering information demo board ordering code pin/ package input type speaker output channels notes ly8321f-db1 pbtl mode (mono) ly8321f-db2 btlx2 mode (stereo) ly8321f-db3 2.1 mode (sex2+btlx1) ly8321f-db4 lqfp48 se sex4 mode
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 4 ? typical application circuit figure 1. ly8321 application circuit with 4xse schematic (*3) when driving R 14v power supply, the device must be mount ed to the pcb board and increase a large area of copper or recommended to use external heat sink.
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 5 ? figure 2. ly8321 application circuit with 2x btl schematic (*3) when driving R 14v power supply, the device must be mount ed to the pcb board and increase a large area of copper or recommended to use external heat sink.
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 6 ? figure 3. ly8321 application circuit with 2x se+1x btl schematic (*3) when driving R 14v power supply, the device must be mount ed to the pcb board and increase a large area of copper or recommended to use external heat sink. absolute maximum ratings parameter symbol rating unit supply voltage pvcc 20.0 v operating temperature t a -40 to 85 (i grade) input voltage v i -0.3v to pvcc +0.3v v storage temperature t stg -65 to 150 power dissipation p d internally limited w esd susceptibility v esd 2000 v junction temperature t jmax 150 soldering temperature (under 10 sec) t solder 260
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 7 ? electrical characteristics (1) (t a = 25 ) parameter symbol test condition min. typ. *2 max. unit power supply voltage pvcc 8.0 - 18.0 high-level input voltage v sdih pvcc=8~18v 2.0 - pvcc low-level input voltage v sdil pvcc=8~18v 0 - 0.3 v quiescent current pvcc=12v, sd R 2.0v, mute=0v, no load - 35 - quiescent current (in mute mode) i q pvcc=12v, mute R 0.8v, no load - 35 - shutdown current i sd pvcc=12v,v shutdown Q 0.8v, no load - 0.2 - ma drain-source on-state resistance rdson pvcc=12v, io=1a - 360 - m ? bypass output voltage v bypass no load - pvcc/6 - v output offset voltage |v os | pvcc=12v, v i =0v, av=10, btl mode - 100 - mv (*2) typical values are included for reference only and are not guaranteed or tested. typical values are measured at pvcc = pvcc(typ.) and t a = 25 ? operating characteristics (2) (t a = 25 ) parameter symbol test condition min. typ. *2 max. unit 217hz input=gnd - -77 - supply ripple rejection ksvr pvcc=12v, av=10, vripple = 200mvpp at 1khz, r l =4 ? , btl mode 217hz input=floating - -78 - db a weighting - 249 - se mode , pvcc=12v, av=10, f = 20 hz to 20 khz,r l =4 ? , without a weighting - 336 - a weighting - 355 - output voltage noise vn btl mode , pvcc=12v, av=10, f = 20 hz to 20 khz,r l =4 ? , without a weighting - 499 - uv a weighting - 85 - se mode , pvcc=12v, av=10, r l =4 ? , max output thd+n<1%, without a weighting - 82 - a weighting - 87 - signal-to-noise ratio snr btl mode , pvcc=12v, av=10, r l =4 ? , max output thd+n<1%, without a weighting - 84 - db a ch. to b ch. - -76 - b ch. to a ch. - -74 - c ch. to d ch. - -68 - se mode , pvcc=12v, av=10, r l =4 ? , po = 0.25w, d ch. to c ch. - -67 - db a ch. to c ch. - -78 - crosstalk cs btl mode , pvcc=12v, av=10, r l =4 ? , po = 0.25w, c ch. to a ch. - -81 - db (*2) typical values are included for reference only and are not guaranteed or tested. typical values are measured at pvcc = pvcc(typ.) and t a = 25
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 8 ? ? operating characteristics (3) (t a = 25 ) parameter symbol test condition min. typ. *2 max. unit oscillator frequency f osc - 316 - khz shutdown temp. - 180 - thermal shutdown temperature t sd restore temp. - 160 - mute attenuation vdd=12v, po=1w - -92 - db mute delay t mute vdd=12v, time from mute input switches high until outputs muted. - 780 - unmute delay t mute time from mute input switches low until outputs muted. - 740 - us pvcc= 18v, c bypass =1 f. - 700 - pvcc=12 v, c bypass =1 f. - 640 - start-up time from shutdown z i pvcc=8 v, c bypass =1 f. - 580 - ms ? operating characteristics (4) (t a = 25 ) r l =4 ? parameter symbol test condition min. typ. *2 max. unit pvcc=8v - 8 - pvcc=10v - 12.5 - pvcc=12v - 18 - pvcc=14v - 24 *3 - pvcc=16v - 30 *3 - btl output - - - - pvcc=8v -- 2.5 - pvcc=10v - 3.5 - pvcc=12v - 5 - pvcc=14v - 6.8 - pvcc=16v - 9 - thd+n =10% se output pvcc=18v - 11 - pvcc=8v - 5.5 - pvcc=10v - 7.6 - pvcc=12v - 14 - pvcc=14v - 17 *3 - pvcc=16v - 20 *3 - btl output - - - - pvcc=8v - 1.8 - pvcc=10v - 2.2 - pvcc=12v - 3.4 - pvcc=14v - 4.5 - pvcc=16v - 5.5 - out power / channel p o r l =4 ? f=1khz, thd+n =1% se output pvcc=18v - 7 - w (*2) typical values are included for reference only and are not guaranteed or tested. typical values are measured at pvcc = pvcc(typ.) and t a = 25 (*3) when driving btl stereo 4 ? loads mode from R 14v power supply, the device must be mounted to the pcb board and increase a large area of copper or recommended to use external heat sink..
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 9 ? ? operating characteristics (5) (t a = 25 ) r l =8 ? parameter symbol test condition min. typ. *2 max. unit pvcc=8v - 4.5 - pvcc=10v - 7 - pvcc=12v - 10 - pvcc=14v - 14 - pvcc=16v - 18 *3 - btl output pvcc=18v - 23 *3 - pvcc=8v - 1.2 - pvcc=10v - 2 - pvcc=12v - 3 - pvcc=14v - 4 - pvcc=16v - 5 - thd+n =10% se output pvcc=18v - 6 - pvcc=8v - 3.2 - pvcc=10v - 5.5 - pvcc=12v - 8 - pvcc=14v - 9 - pvcc=16v - 13.5 *3 - btl output pvcc=18v - 16 *3 - pvcc=8v - 0.8 - pvcc=10v - 1.2 - pvcc=12v - 1.7 - pvcc=14v - 2.5 - pvcc=16v - 3 - out power / channel po r l =8 ? f=1khz, thd+n =1% se output pvcc=18v - 4.2 - w (*2) typical values are included for reference only and are not guaranteed or tested. typical values are measured at pvcc = pvcc(typ.) and t a = 25 (*3) when driving R 14v power supply, the device must be mount ed to the pcb board and increase a large area of copper or recommended to use external heat sink.
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 10 ? typical performanc e characteristics figure 4 thd+n vs. output power (@ output type=btl mode , r l =4 ? , f=1khz, a v =10) figure 5 thd+n vs. output power (@ output type=btl mode , r l =8 ? , f=1khz, a v =10)
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 11 ? figure 6 thd+n vs. output power (@ output type=se mode , r l =4 ? , f=1khz, a v =10) figure 7 thd+n vs. output power (@ output type=se mode , r l =8 ? , f=1khz, a v =10)
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 12 ? figure 8 supply ripple rejection (ksvr, r l =4 ? , btl mode ) figure 8 supply ripple rejection (ksvr, r l =8 ? , btl mode )
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 13 ? figure 10 supply ripple rejection (ksvr, r l =4 ? , se mode ) figure 11 supply ripple rejection (ksvr, r l =8 ? , se mode )
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 14 ? figure 12 snr vs. noise level ( btl mode ) figure 13 snr vs. noise level ( se mode )
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 15 ? figure 14 crosstalk vs. frequency ( btl mode ) figure 15 crosstalk vs. frequency ( se mode )
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 16 ? sd current vs. sd voltage quiescent current vs. supply voltage (btl mode) shutdown current vs. shutdown voltage 0 5 10 15 20 25 30 35 40 45 50 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.5 1.6 1.7 1.8 shutdown voltage - v shutdown current-m a 8v 12v 18v quiescent current vs. supply voltage (btl mode) 20 25 30 35 40 45 50 8v 10v 12v 14v 16v vdd - supply voltage - v quiescent c urrent - m a no load 8 ? , 22uh 4 ? , 22uh( R 14v with head sink) quiescent current vs. supply voltage (se mode)) output power vs. supply voltage(btl mode) quiescent current vs. supply voltage (se mode) 20 25 30 35 40 45 50 8v 10v 12v 14v 16v 18v vdd-supply voltage- v quiescent current-ma no load 8 ? , 22uh 4 ? , 22uh output power vs. supply voltage (btl mode) 0 5 10 15 20 25 30 8v 10v 12v 14v 16v 18v vdd - supply voltage - v (f=1k hz, gain=10 v/v) po-output power-w rl=8 ? /10% rl=8 ? /1% rl=4 ? /10%( R 14v with head sink) rl=4 ? /1%( R 14v with head sink) output power vs. supply voltage(se mode) supply current vs. output power (r l =4 ? ,btl mode) output power vs. supply voltage (se mode) 0 2 4 6 8 10 12 8v 10v 12v 14v 16v 18v vdd - supply voltage - v (f=1k hz, gain=10 v/v) po - out p ut power - w rl=8 ? /10% rl=8 ? /1% rl=4 ? /10% rl=4 ? /1% supply current vs. output power (r l =4 ? , 22uh, btlx2ch) 0 800 1600 2400 3200 4000 0 2x2 4x2 6x2 8x2 10x 2 12x 2 14x 2 16x 2 18x 2 20x 2 22x 2 24x 2 26x 2 28x 2 30x 2 po - output power -w (rl=4 ? , 22uh, 2ch) su pp l y c urrent - ma 8v 12v 16v(with head sink)
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 17 ? supply current vs. output power (r l =8 ? ,btl mode) supply current vs. output power (r l =4 ? ,se mode) supply current vs. output power (r l =8 ? , 22uh, btlx2ch) 0 800 1600 2400 3200 0 2x 2 4x 2 6x 2 8x 2 10x 2 12x 2 14x 2 16x 2 18x 2 20x 2 22x 2 24x 2 po - output power - w su pp l y c u rre n t - m a 8v 12v 18v supply current vs. output power (r l =4 ? , 22uh, sex4ch) 0 400 800 1200 1600 2000 0 0.2x4 0.4x4 0.6x4 0.8x4 1x4 1.2x4 1.4x4 1.6x4 1.8x4 2x4 2.2x4 2.4x4 2.6x4 2.8x4 3x4 3.2x4 3.5x4 4x4 4.2x4 4.5x4 5x4 5.2x4 5.5x4 6x4 6.5x4 7x4 7.5x4 po - output power -w su pp l y current - m a 8v 12v 18v supply current vs. output power (r l =8 ? ,se mode) efficiency (vdd=12v,r l =4 ? ,btl mode) supply current vs. output power (r l =8 ? , 22uh, sex4ch) 0 400 800 1200 0 0.2x4 0.4x4 0.6x4 0.8x4 1x4 1.2x4 1.4x4 1.6x4 1.8x4 2x4 2.2x4 2.4x4 2.6x4 2.8x4 3x4 3.5x4 4x4 4.5x4 5x4 5.5x4 6x4 po - output power - w su pp l y c u rre n t - m a 8v 12v 18v efficiency vs. output power (vdd=12v,r l =4 ? ,btl mode) 0 10 20 30 40 50 60 70 80 0 1 2 4 6 8 10 12 14 15 16 po-output power(w) efficiency(% ) efficiency (vdd=12v,r l =8 ? ,btl mode) efficiency (vdd=12v,r l =4 ? ,se mode) efficiency vs. output power (vdd=12v,r l =8 ? ,btl mode) 0 10 20 30 40 50 60 70 80 90 012345678910 po-output power(w) efficiency(% ) efficiency vs. output power (vdd=12v,rl=4 ? ,se mode) 0 10 20 30 40 50 60 70 80 90 00.10.91.522.533.544.55 po-output power(w) efficiency(% )
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 18 ? efficiency (vdd=12v,r l =8 ? ,se mode) power dissipation vs. output power (vdd=12v,btl mode) efficiency vs. output power (vdd=12v,rl=8 ? ,se mode) 0 10 20 30 40 50 60 70 80 90 0 0.1 0.2 0.3 0.4 0.5 1 1.5 2 2.5 3 po-output power(w) efficiency(% ) power dissipation vs. output power (vdd=12v,btl mode) 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50 5.00 0 1 2 3 4 5 6 7 8 9 10 12 14 15 16 po-output power-w pd-power dissipation-w rl=4 ? ,btl rl=8 ? ,btl power dissipation vs. output power (vdd=12v,se mode) power dissipation vs. output power (vdd=12v,se mode) 0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 0 0.1 0.2 0.3 0.4 0.5 0.9 1 1.5 2 2.5 3 3.5 4 4.5 5 po-output power-w pd-power dissipation-w rl=4 ? ,se rl=8 ? ,se
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 19 ? ? application information input resistors (ri) and gain the ly8321 has two internal amplifier st ages. the pre-amplifier gain is extern ally configurable, while the total gain is internally fixed. the closed-loop gain of the pre-am plifier gain is set by select ing the rf to ri while the total gain is fixed at 4x. so the input resistors (r i ) set the gain of the amplifier according to the equation. pre-amplifier gain = rf / ri output=se mode: total gain = (rf / ri ) x 4 a vd = 20 x log [4 x (rf /ri )] for example table 1. typical total gain and a vd values (se mode) rf (k ? ) 50 100 150 200 250 300 ri (k ? ) 50 50 50 50 50 50 total gain 4 8 12 24 20 24 a vd (db) 12.04 18.06 21.58 24.08 26.02 27.6 output=btl mode: total gain = (rf / ri ) x 8 a vd = 20 x log [8 x (rf /ri )] for example table 2. typical total gain and a vd values (btl mode) rf (k ? ) 50 100 150 200 ri (k ? ) 50 50 50 50 total gain 8 16 24 32 a vd (db) 18.06 24.08 27.6 30.1 input capacitors (ci) in typical application, c i and the input resistance of the amplifier (r i ) form a high-pass filter with the corner frequency(f c ) determined in equation. fc = 1 / ( 2 ri ci ) the value of the input capacitor is important to cons ider as it directly affects the bass (low frequency) performance of the circuit.
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 20 ? for example c i is 0.1 f, so one would likely choose a value in the range of 0.1 f to 1.0 f. r i is 50 k and the specification calls for a flat bass response down to 30 hz. ci = 1 / ( 2 ri fc) ci = 1 / ( 2 x 50k ? x 30hz)=0.106uf one would likely choose a value of 0.1uf as this value is commonly used. note that it is important to c i must be 10 times smaller than the bypass capacitor to reduce clicking and popping noise from power on/off and entering and leaving shutdown. after sizing c i for a given cutoff frequency, size the bypass capacitor to 10 times that of the input capacitor. ci Q cbypass bypass capacitor (cbypass) the bypass capacitor (c3 ) is the most critical capacitor and serves important functions. during start-up or recovery from shutdown mode, cbypas s determines the rate at whic h the amplifier starts up. the cbypass will to reduce noise caused by the power supply coupling into the output drive signal. this noise is from the internal analog reference to the amp lifier, which appears as degraded the psrr and thd+n values. the bypass capacitor (c3 ) with values of 1.0 f to 10.0 f is recommended for the best thd and noise performance. therefore, increasing the bypass capaci tor reduces clicking and popping noise from power on/off and entering and leaving shutdown. to have minimal pop, cbypass should be 10 times larger than c i . cbypass R ci power supply decoupling capacitor (c s ) the ly8321 is a high-performance class-d audio amplif ier that requires adequate power supply decoupling to ensure the efficiency is high and total harmonic distor tion (thd) is low. for higher frequency transients, spikes, or digital hash on the line, a good low equivalent -series-resistance (esr) ceramic capacitor, typically 0.1uf~1.0uf, placed as close as possible to the device pvcc lead works best. placing this decoupling capacitor close to the ly8321 is very important for th e efficiency of the class-d amplifier, because any resistance or inductance in the trace between the devic e and the capacitor can cause a loss in efficiency. for filtering lower-frequency noise signals, a 470uf or gr eater capacitor placed near the audio power amplifier would also help, so 470uf or larger capacitor should be placed on each pvcc terminal. single-ended output capacitor, (c o ) in single-ended (se) applications, the dc blocking capacitor forms a high-pass filter with the speaker impedance. the frequency response rolls off with decre asing frequency at a rate of 20 db/decade. the cutoff frequency is determined by fc = 1 / (2 r l co) table 3. filter responses reference values se mode - co capacitor select(uf) speaker load ( ? ) fc = 60 hz fc = 40 hz fc = 20 hz 4 680 1000 2200 6 470 680 1500 8 330 470 1000
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 21 ? output filter and frequency response the output filter components consist of the seri es inductor and capacitor to ground at the l out and r out pins. there are several possible configurations, depending on the speaker impedance and whether the output configuration is single-ended (se) or bridge-tied load (btl). table 4 lists the recommended values for the filter components. it is important to use a high-quality capacitor in this application. table 4. recommended filter output components reference values output type speaker load ( ? ) filter inductor (uh) filter capacitor (uf) bridge tied load (btl) 8 22 0.68 8 33 0.47 single ended (se) 4 22 0.68 bst capacitors the half h-bridge output stages use only nmos transistors. therefore, they require bootstrap capacitors for the high side of each output to turn on correctly. a 1.0 ceramic capacitor, rated for at least 25v up, must be connected from each output to its corresponding bootst rap input. specifically, all 1.0 capacitor must be connected from out to bst pin. the bootstrap capacitors connected between the bst pi ns and their corresponding outputs function as a floating power supply for the high-side n-channel powe r mosfet gate-drive circuitry. during each high-side switching cycle, the bootstrap capa citors hold the gate-to-source voltage high enough to keep the high-side mosfets turned on. vclamp capacitor to ensure that the maximum gate-to-source voltage fo r the nmos output transist ors is not exceeded, one internal regulator clamps the gate voltage. a 1.0uf capa citor must be connected from vclamp pin to ground and must be rated for 25v up. the voltages at the vclamp terminal may vary with pvcc and may not be used for powering any other circuitry. shutdown function when the ly8321 not in use. the device will be to turn off the amplifier to reduce power consumption. when logic low is applied to the shutdown pin, this shutdown feature will turns the amplifier off. by switching the shutdown pin connected to gnd, t he device supply current draw will be minimized in idle mode. the pin cannot be left floating due to the internal did not pull-up. mute function the mute pin is an input pin to control the ly8321 output state. a logic high is disable the ly8321 outputs. a logic low on this pin enables the outputs. this terminal may be used as a quick disable/enable of outputs when changing channels on a tv or transitioning between different audio sources. the mute pin should never be left floating. for power conservation, the sd pin should be used to reduce the quiescent current to the absolute minimum level. over-heat protection the ly8321 has a built-in over-heat protection circuit, it will turn off all power output when the chip temperature over 180 , the chip will return to normal operation au tomatically after the temperature cool down to 160 .
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 22 ? short circuit protection the ly8321 has short circuit protection circuitry on the outputs that prevents damage to the device during output-to-output shorts. when a short- circuit is detected on the outputs, the part immediately goes into shutdown. this is a latched fault and must be reset by cycling the voltage on the shutdown pin to a logic low and back to the logic high, or by cycling the power off and then back on. this clears the short-circuit flag and allows for normal operation if the short was removed. if the short was not removed, the protection circuitry activates again. pcb layout because the ly8321 is a class-d amplif ier that switches at a high frequency, the layout of the pcb should be optimized according to the following guide lines for the best possible performance. 1. thermal pad?the thermal pad must be soldered to the pcb for proper thermal performance and optimal reliability. 2. decoupling capacitors?the high-frequency 0.1uf dec oupling capacitors should be placed as close to the pvcc pins and avcc pin terminals as possible. and the bypass pin capacitor and vclamp pin capacitor should also be placed as close to the device as possible. large (1000uf or greater) bulk power-supply decoupling capacitors should be placed near the device on the pvcc terminals. 3. grounding?the avcc pin decoupling capacitor and bypass pin capacitor should each be grounded to analog ground (agnd). the pvcc decoupling capacitors and vclamp capa citors should each be grounded to power ground (pgnd). analog ground and power ground should be connec ted at the thermal pad, which should be used as a central ground connection or star ground for the ly8321. 4. output filter?the reconstruction f ilter should be placed as close to t he output terminals as possible for the best emi performance. the capacitors should be grounded to power ground. 5. the input resistors need to be very close to the de vice input pins so noise does not couple on the high impedance nodes between the input resistors and the input amplifier of the device. 6. making the high current trac es going to pvcc, gnd, v o+ and v o- pins of the device should be as wide as possible to minimize trace resistance. if these trac es are too thin, the device?s performance and output power will decrease. the input traces do not need to be wide, but do need to run side-by-side to enable common-mode noise cancellation.
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 23 ? ? demo board information-1 (satelli te type - 4xse or 2xbtl mode) demo board application circuit (4xse mode) figure 16 ly8321 demo board application circuit (4xse mode) (*3) when driving R 14v power supply, the device must be mount ed to the pcb board and increase a large area of copper or recommended to use external heat sink.
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 24 ? demo board application circuit (2xbtl mode) figure 17 ly8321 demo board application circuit (2xbtl mode) (*3) when driving R 14v power supply, the device must be mount ed to the pcb board and increase a large area of copper or recommended to use external heat sink.
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 25 ? demo board bom list (4xse and 2xbtl mode) ly8321 v1.0 bom list (4xse mode) no. description reference amount note remark 1 capacitor,470uf c1,c2,c11,c21,c31,c41 6 dip, 35v,105 , 10*20, ec cap. 2 capacitor, 0.1uf c8, c15,c25,c35,c45 5 smd0805,80%/-20%,np 3 capacitor, 1uf c3,c5,c6, c10, c20,c30, c40, c12, c22, c32, c42 11 smd0805 ,80%/-20%,np 4 capacitor, 0.22uf c14,c24,c34,c44 4 smd0805,80%/-20%,np 5 capacitor, 0.22uf c13,c23,c33,c43 4 dip, msc,100vdc, 10% 6 resistor, 150k ? r12,r22,r32,r42 4 smd0805,1/8w, 1% 7 resistor, 100k ? r1,r2 2 smd0805,1/8w, 1% 8 resistor, 51k ? r10,r20,r30,r40 4 smd0805,1/8w, 1% 9 resistor, 4.7k ? r11,r21,r31,r41 4 smd0805,1/8w, 1% 10 resistor, 510 ? r13 1 smd0805,1/8w, 1% 11 diode 1n4148 d12, d22, d3 2, d42 4 dip, nxp 100v,200ma 12 zener diode 6.2v d1 1 dip, hitachi (hz6c2ta-e) 13 fixed inductors 33uh l1,l2,l3,l4 4 dip toko (a7502by-330m) 14 ic u1 1 ly8321,(lqfp48) 15 1*2 pin header w1,w2 2 pitch 3.96mm 16 1*2 pin header j1,j2,j3,j4,j5 5 pitch 2.54mm 17 phone jack jk1, jk2 2 3.5, 5p, 90 18 speaker jack spk a/b,spk c/d 2 2*2p(r.b.) ly8321 v1.0 bom list (2xbtl mode) no. description reference amount note remark 1 capacitor,1000uf c1,c2 2 dip, 35v,105 , 10*20, ec cap.. 2 capacitor, 1uf c3, c5, c6, c10, c20, c12,c22,c32,c42 9 smd0805 ,80%/-20%,np 3 capacitor,0.47uf c14, c24, c34, c44 4 smd0805 ,80%/-20%,np 4 capacitor, 0.1uf c8,c15,c25,c35,c45 5 smd0805,80%/-20%,np 5 capacitor, 0.22uf c13,c23,c33,c43 4 dip, msc,100vdc, 10% 6 resistor, 150k ? r12,r32 2 smd0805,1/8w, 1% 7 resistor, 100k ? r1,r2 2 smd0805,1/8w, 1% 8 resistor, 51k ? r10,r30 2 smd0805,1/8w, 1% 9 resistor, 510 ? r13 1 smd0805,1/8w, 1% 10 resistor, 0 ? r23 1 smd0805,1/8w, 1% 11 diode 1n4148 d12, d22, d3 2, d42 4 dip, nxp 100v,200ma 12 zener diode 6.2v d1 1 dip, hitachi (hz6c2ta-e) 13 fixed inductors 22uh l1,l2,l3,l4 4 dip, toko (a7502by-330m) 14 ic u1 1 ly8321,(lqfp48) 15 1*2 pin header w1,w2 2 pitch 3.96mm 16 1*2 pin header j1,j2,j3,j4,j5 5 pitch 2.54mm 17 phone jack jk1, jk2 2 3.5, 5p, 90 18 speaker jack spk a/b, spk c/d 2 2*2p(r.b.)
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 26 ? demo board artwork (4xse or 2xbtl mode) top silkscreen top layer
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 27 ? composite view (top layer) bottom silkscreen
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 28 ? bottom layer composite view (bottom layer)
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 29 ? ? demo board information-2 (2x se+1xbtl(subwoofer) mode) demo board application circuit (2xse+1xbtl mode) figure 18 ly8321 demo board application circuit (2xse+1xbtl mode) (*3) when driving R 14v power supply, the device must be mount ed to the pcb board and increase a large area of copper or recommended to use external heat sink.
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 30 ? demo board bom list (2xse+1xbtl mode) ly8321 v1.0 bom list (2xse+1xbtl mode) no. description reference amount note remark 1 capacitor,1000uf c1,c2 2 dip 35v,105 , 10*20, ec cap. 2 capacitor,470uf c11,c21 2 dip 35v,105 , 10*20, ec cap. 3 capacitor, 1uf c3, c5, c6, c50, c60 c12,c22,c32,c42 9 smd0805,80%/-20%,np 4 capacitor,0.47uf c14,c24, c34, c44 4 smd0805,80%/-20%,np 5 capacitor, 0.1uf c8, c51, c15, c25, c35,c45 6 smd0805 ,80%/-20%,np 6 capacitor, 0.01uf c10, c20 1 smd0805,80%/-20%,np 7 capacitor, 0.068uf c55 2 smd0805,80%/-20%,np 8 capacitor, 0.033uf c53, c54 2 smd0805,80%/-20%,np 9 capacitor, 0.022uf c52 1 smd0805,80%/-20%,np 10 capacitor, 0.22uf c13,c23,c33,c43 4 dip, msc,100vdc, 10% 11 resistor, 150k ? r12,r22, r32, r55 4 smd0805,1/8w, 1% 12 resistor, 100k ? r1,r2 2 smd0805,1/8w, 1% 13 resistor, 68k ? r50,r51 2 smd0805,1/8w, 1% 14 resistor, 51k ? r10,r20, r30 3 smd0805,1/8w, 1% 15 resistor, 33k ? r52 1 smd0805,1/8w, 1% 16 resistor, 27k ? r54 1 smd0805,1/8w, 1% 17 resistor, 12k ? r53 1 smd0805,1/8w, 1% 18 resistor, 4.7k ? r11,r21 2 smd0805,1/8w, 1% 19 resistor, 510 ? r13 1 smd0805,1/8w, 1% 20 diode 1n4148 d12, d22, d32, d42 4 dip, nxp 100v,200ma 21 zener diode 6.2v d1 1 dip hitachi (hz6c2ta-e) 22 fixed inductors 22uh l1,l2,l3,l4 2 dip, toko (a7502by-220m) 23 ic u1 1 ly8321,(lqfp48) 24 1*2 pin header w1,w2 2 pitch 3.96mm 25 1*2 pin header j1,j2,j3,j4,j5 5 pitch 2.54mm 26 phone jack jk1, jk2 2 3.5, 5p, 90 27 speaker jack spk a/b / spk c/d 2 2*2p(r.b.)
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 31 ? 2.1 channel (2xse+1xbtl mode) hi-low pass filter cutoff frequency chart figure 19 ly8321 2.1ch. (2xse+1xbtl mode) hi -low pass filter cutoff frequency chart
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 32 ? demo board artwork (2xse + 1xbtl mode) top silkscreen top layer
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 33 ? composite view (top layer) bottom silkscreen
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 34 ? bottom layer composite view (bottom layer)
ly8321 rev. 1.0 30wx2 stereo class d audio power amplifier lyontek inc. reserves the rights to change the specif ications and products without notice. 5f, no. 2, lndustry e . rd. ix, science-ba sed industrial park, hsinchu 300, taiwan tel: 886-3-6668838 fax: 886-3-6668836 35 ? package outline dimension lqfp 48 pin package outline dimension

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