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ly8221 rev. 1.3 3.0w stereo & 3d enhancement class d audio power amplifier (sop16) lyontek inc. reserves the rights to change the specifications 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 ? 3.0w stereo into 4 ? from 5.5v power supply at thd+n = 10%. ? 2.5v~5.5v power supply. ? low shutdown current. ? low quiescent current. ? minimum external components. ? no output filter required for inductive loads. ? short-circuit and thermal protection. (short to gnd, vdd. and output to output) ? low noise during device turn-on. ? support 3d enhance function. ? lead free and green package available. (rohs compliant) ? package : 16-pin 150 mil sop 16-pin 5x5 qfn application ? portable electronic devices. ? mobile phones. ? multimedia tft lcd tvs / monitors. general description the ly8221 is a 3.0w stereo, high efficiency class d audio power amplifier. it is a low noise, filterless, pwm architecture eliminates the output filter, reducing external component count, bom (system) cost, and simplify design. the ly8221 features a low power consumption in shutdown mode and thermal shutdown protection. it also utilizes circuitry to reduce low noise during device turn-on. the outputs are also fully protected against short to gnd, vdd, and output-to- output. the short-circuit protection and thermal protection include an auto-recovery feature. ly8221 support the 3d function. when selectable the 3d enhance mode function provides enhanced stereo imaging. pin configuration ly8221 sop16 pin configuration (top view)
ly8221 rev. 1.3 3.0w stereo & 3d enhancement class d audio power amplifier (sop16) lyontek inc. reserves the rights to change the specifications 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 ? ly8221 qfn16 pin configuration (top view) pin description pin no. symbol sop16 qfn16 description 3d control 1 15 3d selection pin. (when high level is 3d mode). 3d_inl 2 16 3d input of left channel. inl 3 1 input of left channel. shutdown 4 2 shutdown control pin. (when low level is shutdown mode). 3d_inr 5 3 3d input of right channel. inr 6 4 input of right channel. bypass 7 5 bypass pin. nc 8 6 no connection v dd 9/16 7/14 power supply of left and right channel. vo+(r) 10 8 positive(+) btl output of right channel. gnd 11/14 9/12 ground vo-(r) 12 10 negative(-) btl output of right channel. vo+(l) 13 11 positive(+) btl output of left channel. vo-(l) 15 13 negative(-) btl output of left channel.
ly8221 rev. 1.3 3.0w stereo & 3d enhancement class d audio power amplifier (sop16) lyontek inc. reserves the rights to change the specifications 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 feature ordering code speaker channels pin/ package output power (thd+n=10%) input type output type 3d ly8221sl stereo sop16 3.0w/4 ? @5.5v_btl 2.5w/4 ? @5.0v_btl 1.8w/8 ? @5.5v_btl 1.5w/8 ? @5.0v_btl se btl yes ly8221el stereo qfn16 3.0w/4 ? @5.5v_btl 2.5w/4 ? @5.0v_btl 1.8w/8 ? @5.5v_btl 1.5w/8 ? @5.0v_btl se btl yes typical application circuit figure 1. ly8221sl typical app lication circuit with 3d
ly8221 rev. 1.3 3.0w stereo & 3d enhancement class d audio power amplifier (sop16) lyontek inc. reserves the rights to change the specifications 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 ? absolute maximum ratings* parameter symbol rating unit supply voltage v dd 6.0 v operating temperature t a -40 to 85 (i grade) input voltage v i -0.3v to v dd +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 electrical characteristics (t a = 25 ) parameter symbol test condition min. typ. *1 max. unit power supply voltage v dd 2.5 - 5.5 v v dd = 5.5v, no load - 6.5 - v dd = 3.6v, no load - 5.5 - quiescent current i q v dd = 2.5v, no load - 4.5 - ma shutdown current i sd v shutdown Q 0.8v, v dd = 2.5v to 5.5v - 0.1 - a high-level input voltage v ih shutdown 1.2 - v dd v low-level input voltage v il shutdown 0 - 0.4 v output offset voltage |v os | v i = 0 v, av = 2 v/v, v dd = 2.5 v to 5.5 v - - 25 mv ? operating characteristics (1) (t a = 25 ) parameter symbol test condition min. typ. *1 max. unit v dd =5.5v - 3.0 - v dd =5.0v - 2.5 - v dd =3.6v - 1.25 - thd+n=10% v dd =2.5v - 0.55 - v dd =5.5v - 2.5 - v dd =5.0v - 2.0 - v dd =3.6v - 1.0 - r l = 4 ? f = 1 khz, thd+n=1% v dd =2.5v - 0.4 - v dd =5.5v - 1.8 - v dd =5.0v - 1.5 - v dd =3.6v - 0.75 - thd+n= 10% v dd =2.5v - 0.35 - v dd =5.5v - 1.45 - v dd =5.0v - 1.2 - v dd =3.6v - 0.6 - out power / channel p o r l = 8 ? f = 1 khz, thd+n= 1% v dd =2.5v - 0.25 - w (*1)typical values are included for reference only and are not guaranteed or tested. typical values are measured at vcc = vcc(typ.) and t a = 25
ly8221 rev. 1.3 3.0w stereo & 3d enhancement class d audio power amplifier (sop16) lyontek inc. reserves the rights to change the specifications 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 ? ? operating characteristics (2) (t a = 25 ) parameter symbol test condition min. typ. *1 max. unit crosstalk cs v dd = 3.6 v, r l = 8 ? f=1khz, v dd =3.6v - -100 - db signal-to-noise ratio snr po= 1.0 w, r l = 8 ? v dd =5.0v - 85 - db output voltage noise vn v dd = 5.0 v, r l = 8 ? , f = 20 hz to 20 khz, inputs ac-grounded with ci = 0.22 f no weighting - 100 - uv rms c bypass = 2.2 f - 316 - c bypass = 1.0 f - 272 - c bypass = 0.47 f - 96 - c bypass =0.1 f - 60 - v dd = 5.0v c bypass =56nf - 36 - c bypass = 2.2 f - 244 - c bypass = 1.0 f - 192 - c bypass = 0.47 f - 76 - c bypass =0.1 f - 40 - start-up time from shutdown z i v dd = 3.7 v c bypass =56nf - 36 - ms frequency fc vdd=2.5v~5.5v - 230 - khz closed-loop gain gv v dd = 2.5v to 5.5v - 150k ? /ri - (*1)typical values are included for reference only and are not guaranteed or tested. typical values are measured at vcc = vcc(typ.) and t a = 25
ly8221 rev. 1.3 3.0w stereo & 3d enhancement class d audio power amplifier (sop16) lyontek inc. reserves the rights to change the specifications 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 ? typical performanc e characteristics figure 2 total harmonic distortion + noise vs output power (r l = 4 ? , stereo) figure 3 total harmonic distortion + noise vs output power (r l = 8 ? , stereo)
ly8221 rev. 1.3 3.0w stereo & 3d enhancement class d audio power amplifier (sop16) lyontek inc. reserves the rights to change the specifications 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 ? figure 4 noise floor (vdd=5.0v / r l =8 ? ) figure 5 crosstalk (vdd=3.6v / r l =8 ? )
ly8221 rev. 1.3 3.0w stereo & 3d enhancement class d audio power amplifier (sop16) lyontek inc. reserves the rights to change the specifications 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 ? supply current vs output power (8 ? ) supply current vs output power (4 ? ) supply current vs output power 0 100 200 300 400 500 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 po-output pow er-w rl=8 ohm supply current-ma 2.5v 3.6v 5v suppl y current vs output power 0 100 200 300 400 500 600 700 800 900 1000 0 0.2 0.4 0.8 1.2 1.6 2 2.4 2.8 3 po-output pow er-w rl=4 ohm supply current-ma 2.5v 3.6v 5v output power vs rl (thd+n = 1%) output power vs rl (thd+n = 10%) output power vs rl (thd+n = 1%) 0 0.5 1 1.5 2 2.5 4 8 12 16 20 24 28 32 rl po 2.5v 3v 3.6v 5v output power vs rl (thd+n = 10%) 0 0.5 1 1.5 2 2.5 3 4 8 12 16 20 24 28 32 rl po 2.5v 3v 3.6v 5v output power vs supply voltage (8 ? ) output power vs supply voltage (4 ? ) output power vs supply voltage 0 0.5 1 1.5 2 2.5 2.5 3.6 5 5.5 6 vdd-supply voltage-v po-output power-w thd+n=10% thd+n=1% output power vs supply voltage 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 2.5 3.6 5 5.5 6 vdd-supply voltage-v po-output power-w thd+n=10% thd+n=1%
ly8221 rev. 1.3 3.0w stereo & 3d enhancement class d audio power amplifier (sop16) lyontek inc. reserves the rights to change the specifications 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 ? shutdown vs shutdown voltage quiescent current vs supply voltage shutdown current vs shutdown voltage 0 20 40 60 80 100 120 140 160 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 shutdown voltage - v i(sd) shutdown current - ua 2.5v 3.6v 5v quiescent current vs supply voltage 3 4 5 6 7 8 9 10 2.5 3 3.5 4 4.5 5 5.5 vdd-supply voltage-v iq-quiescent current-m a no load 8 efficiency vs po(rl=8 ohm) vdd=3.6v efficiency vs po(rl=8 ohm) vdd=5.0v efficiency vs po(rl=8 ohm) 0 10 20 30 40 50 60 70 80 90 100 0 0.1 0.2 0.3 0.4 0.5 po-w efficiency vdd=3.6v efficiency vs po(rl=8 ohm) 0 10 20 30 40 50 60 70 80 90 0 0.2 0.4 0.6 0.8 1 1.2 1.4 po - w efficiency-% vdd=5v power dissipation vs output power pd vs po ( 2ch ) (rl=8 ohm) 0 0.1 0.2 0.3 0.4 0.5 0.6 0 0.2 0.4 0.6 0.8 1 1.2 1.4 po-w pd-w pd(5v) pd(3.6v)
ly8221 rev. 1.3 3.0w stereo & 3d enhancement class d audio power amplifier (sop16) lyontek inc. reserves the rights to change the specifications 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 ? fcc class-b (vertical) ? stereo mode fcc class-b (horizontal) ? stereo mode
ly8221 rev. 1.3 3.0w stereo & 3d enhancement class d audio power amplifier (sop16) lyontek inc. reserves the rights to change the specifications 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 ? fcc class-b (vertical) ? 3d mode fcc class-b (horizontal) ? 3d mode
ly8221 rev. 1.3 3.0w stereo & 3d enhancement class d audio power amplifier (sop16) lyontek inc. reserves the rights to change the specifications 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 ? ? application information input resistors (ri) and gain the ly8221 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 2x. so the input resistors (r i ) set the gain of the amplifier according to the equation. pre-amplifier gain = rf / ri total gain = (rf / ri ) x 2 a vd = 20 x log [2 x (rf /ri )] the resistor matching is very important in the amp lifiers. balance of the output on the reference voltage depends on matched ratio of the resistors. cmrr, psrr, and cancellation of the second harmonic distortion if resistor mismatch occurs. therefore, it is recomm ended to use 1% tolerance resistors or better to keep the performance optimized. matching is more important than overall tolerance. resistor arrays with 1% matching can be used with a tolerance greater than 1%.place the input resistors very close to the ly8221 to limit noise injection on the high -impedance nodes. for optimal performance the gain should be set to 2 v/v or lower. lower gain allows the ly8221 to operate at its best, for example table 1. typical total gain and a vd values rf (k ? ) 150 150 150 150 150 150 ri (k ? ) 150 75 50 37.5 25 18.75 pre amp. gain 1 2 3 4 6 8 total gain 2 4 6 8 12 16 a vd (db) 6.02 12.04 15.56 18.06 21.58 24.08 input capacitors (ci) the ly8221 using fully differential source, so the input coupling capacitors are requi red. the input capacitors and input resistors form a high-pass filter with the corner frequency(f c ), determined in the 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. speakers in wireless phones cannot usually respond well to low frequencies, so the corner frequency can be set to block low frequencies in this application. equation is reconfigured to solve for the input coupling capacitance. ci = 1 / ( 2 ri fc ) if the corner frequency is within the audio band, the capacitors should have a tolerance of 10% or better, because any mismatch in capacitance causes an im pedance mismatch at the corner frequency and below. for example
ly8221 rev. 1.3 3.0w stereo & 3d enhancement class d audio power amplifier (sop16) lyontek inc. reserves the rights to change the specifications 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 ? in the table 2 shows the external components. rin in connect with cin to create a high-pass filter. table 2. typical component values reference description note ri 150k ? 1% tolerance resistors ci 0.22uf 80%/?20% ci = 1 / ( 2 ri fc) ci = 1 / ( 2 x 150k ? x 4.8hz)=0.221uf use 0.22uf decoupling capacitor (c s ) the ly8221 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 1.0uf, placed as close as possible to the device v dd lead works best. placing this decoupling capacitor close to the ly8221 is very important for the efficiency of the class-d amplifier, because any resistance or inductance in the trace between the device and the capa citor can cause a loss in efficiency. for filtering lower-frequency noise signals, a 10. 0uf or greater capacitor placed near the audio power amplifier would also help, but it is not required in most applicati ons because of the high psrr of this device. over-heat protection the ly8221 has a built-in over-heat protection circuit, it will turn off all power output when the chip temperature over 150 , the chip will return to normal operation au tomatically after the temperature cool down to 120 . 3d enhance the ly8221 has a built-in 3d enhance effect that widens the perceived soundstage from the stereo audio signal. the 3d enhance improves the apparent st ereo channel separation whenever the left and right speakers are too close, due to system si ze constraints or equipment limitations. activating the 3d effect by applying vdd to pin 1 (3d cont rol) and external rc network (shown in figure 1) is required to enable the 3d effect. the amount of the 3d e ffect is set by the r3 and c3. decreasing the value of r3 will increase the 3d effect. increa sing the value of the capacitors c3 will decrease the lo w cutoff frequency at which the 3d effect starts to occur.the amount of perceived 3d is also dependent on many other factors such as speaker placement and the distance to the list ener. therefore,it is recommended that the user try various values of r3 and c3 to get a feel fo r how the 3d effect works in the application. pcb layout all the external components must place very close to the ly8221. the input resistors need to be very close to the ly8221 input pins so noise does not couple on th e high impedance nodes betwee n the input resistors and the input amplifier of the ly8221. then place the deco upling capacitor cs, close to the ly8221 is important for the efficiency of the class-d amplifier. any resist ance or inductance in the trace between the device and the capacitor can cause a loss in efficiency. making the high current traces going to vdd, gnd, v o+ and v o- pins of the ly8221 should be as wide as possible to minimize trace resistance. if these trac es are too thin, the ly8221'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.
ly8221 rev. 1.3 3.0w stereo & 3d enhancement class d audio power amplifier (sop16) lyontek inc. reserves the rights to change the specifications 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 ? ? demo board information demo board application circuit (btl) j11 jumper 1 2 c3 c0805 j15 jumper 1 2 c6 c0805 1nf 0.22uf 150k 600r/100mhz 1uf 1nf 1uf 10uf c11 c0603 vss vdd vss 600r/100mhz 1nf 1nf 150k l6 c0805 r3 r0805 r1 r0805 vss vss j14 jumper 1 2 j13 jumper 1 2 c4 c0805 c5 c0805 c14 c0603 vss 150k 600r/100mhz vss c15 c0603 600r/100mhz j12 jumper 1 2 l5 c0805 gnd r5 r0805 vcc j10 jumper 1 2 j4 phonejack 2 3 4 5 1 u1 ly 8221sl-v1.1 1 2 3 4 5 6 7 8 9 10 15 12 11 13 14 16 3d 3d_lin lin- sdb 3d_rin rin- by pass nc pvdd1 rout+ lout- rout- pvss1 lout+ pvss2 pvdd2 30k j5 phonejack 2 3 4 5 1 j3 phonejack 2 3 4 5 1 0.22uf c16 c0603 l2 c0805 1nf 600r/100mhz c2 c0805 r4 r0805 c12 c0603 j1 jumper 1 2 l1 c0805 c1 c0805 0.1uf r2 r0805 l4 c0805 1nf c13 c0603 600r/100mhz j2 jumper 1 2 l3 c0805 150k figure 2 ly8221sl demo board application circuit demo board bom list ly8221sl (btl) v1.1 bom list no. description reference note 1 resistor, 30k ? r3 1/16w,1% 2 resistor, 150k ? r1,r2,r4,r5 1/16w,1% 3 capacitor, 330pf(option) c12,c13,c15,c16 80%/ ? 20%, nonpolarized 4 capacitor, 390pf(option) c11,c14 80%/ ? 20%, nonpolarized 5 capacitor, 0.1uf c5 80%/ ? 20%, nonpolarized 6 capacitor, 0.22uf c1,c2 80%/ ? 20%, nonpolarized 7 capacitor, 1.0uf c3,c4 80%/ ? 20%, nonpolarized 8 capacitor, 10.0uf c6 80%/ ? 20%, 6.3 v 9 chip bead 1k ? /100mhz(option) l1,l2,l3,l4,l5,l6 1000 ? (1k ? )25%/100mhz 10 ic u1 ly8212sl, sop16 8 1*2 pin header j1,j2 j1 open ? shutdown j2 short ? 3d enable
ly8221 rev. 1.3 3.0w stereo & 3d enhancement class d audio power amplifier (sop16) lyontek inc. reserves the rights to change the specifications 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 ? demo board artwork top silkscreen top layer
ly8221 rev. 1.3 3.0w stereo & 3d enhancement class d audio power amplifier (sop16) lyontek inc. reserves the rights to change the specifications 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 ? bottom layer composite view
ly8221 rev. 1.3 3.0w stereo & 3d enhancement class d audio power amplifier (sop16) lyontek inc. reserves the rights to change the specifications 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 ? package outline dimension sop 16 pin package outline dimension
ly8221 rev. 1.3 3.0w stereo & 3d enhancement class d audio power amplifier (sop16) lyontek inc. reserves the rights to change the specifications 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 ? qfn(5x5) 16 pin package outline dimension

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