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ly8010 rev. 2.0 3.3 w mono filterless class d audio power amplifier 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 ? 3.3 w into 4 ? from 5.5v power supply at thd+n = 10% (typ.). ? 2.0 w into 8 ? from 5.5v power supply at thd+n = 10% (typ.). ? 2.5v~5.5v power supply. ? low shutdown current. ? low quiescent current. ? minimum external components. ? no output filter required for inductive loads. ? output pin short-circuit protection and automatic recovery. (short to output pin, shor t to gnd, short to vdd). ? low noise during turn-on and turn-off transitions. ? lead free and green package available. (rohs compliant) ? 8-pin dfn package. application ? portable electronic devices ? mobile phones ? pdas general description the ly8010 is a high efficiency, 3.3 w mono class d audio power amplifier. it is a low noise, filterless pwm architecture eliminates the output filter, reducing external component count, system cost, and simplify design. the ly8010 is designed to meet of portable electronic devices. the ly8010 is a single 5.5v power supply, it is capable of driving 4 ? speaker load at a continuous avera ge output of 3.3 w with 10% thd+n. not external heat-sink is required. in cellular handsets, the earpiece, speaker phone, and melody ringer can each be driven by the ly8010.the gain of the ly8010 is externally configurable which allows independent gain control from multiple sources by summing the signals. output short circuit and thermal overload protection prevent the device from damage during fault conditions. pin configuration
ly8010 rev. 2.0 3.3 w mono filterless class d audio power amplifier 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 ? pin description pin no. symbol dfn description shutdown 1 shutdown the device. (when low level is shutdown mode). nc 2 no internal connection av dd -- analog power supply +in 3 positive input -in 4 negative input vo+ 5 positive btl output v dd 6 power supply gnd 7 ground vo- 8 negative btl output ordering information ordering code speaker channels pin/ package output power (thd+n=10%) input type output type LY8010BL mono dfn8 3.3w/4 ? @5.5v_btl 2.7w/4 ? @5.0v_btl 2.0w/8 ? @5.5v_btl 1.6w/8 ? @5.0v_btl se/ df btl
ly8010 rev. 2.0 3.3 w mono filterless class d audio power amplifier 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 ? application circuit figure 1. application schematic with differential input configuration figure 2. application schematic with single-ended input cofiguration
ly8010 rev. 2.0 3.3 w mono filterless class d audio power amplifier 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 ,unless otherwise noted) parameter symbol test condition min. typ. *1 max. unit supply voltage v dd 2.5 - 5.5 v high-level input voltage v ih shutdown 1.3 - v dd v low-level input voltage v il shutdown 0 - 0.35 v output offset voltage (measured differentially) |v os | v i = 0 v, av = 2 v/v, v dd = 2.5 v to 5.5 v - - 25 mv power supply rejection ratio psrr v dd = 5.0 v, r l =4 ? , inputs= gnd, av=2, vpp=200mv, cs=delete. f=217hz - -55 - db v dd = 5.5v, no load - 3.5 - v dd = 3.6v, no load - 3.0 - quiescent current i q v dd = 2.5v, no load - 2.5 - ma shutdown current i sd v shutdow n Q 0.5v, v dd = 2.5v to 5.5v - 0.1 2.0 a total gain (*) v dd = 2.5v to 5.5v r l = 8 ? [150k ? / (5k ? +ri)] x2 v/v (*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
ly8010 rev. 2.0 3.3 w mono filterless class d audio power amplifier 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 (t a = 25 , gain = 2v/v) parameter symbol test condition min. typ. *1 max. unit v dd =5.5v - 3.3 - v dd =5.0v - 2.75 - v dd =3.6v - 1.4 - thd+n= 10%, f = 1 khz, r l = 4 ? v dd =2.5v - 0.6 - v dd =5.5v - 2.6 - v dd =5.0v - 2.15 - v dd =3.6v - 1.1 - thd+n= 1%, f = 1 khz, r l = 4 ? v dd =2.5v - 0.1 - v dd =5.5v - 2.0 - v dd =5.0v - 1.6 - v dd =3.6v - 0.8 - thd+n= 10%, f = 1 khz, r l = 8 ? v dd =2.5v - 0.4 - v dd =5.5v - 1.6 - v dd =5.0v - 1.3 - v dd =3.6v - 0.7 - out power p o thd+n= 1%, f = 1 khz, r l = 8 ? v dd =2.5v - 0.1 - w r l = 4 ? , input=gnd, signal-to-noise ratio snr 1.0w=0db v dd =5.0v - 88 - db output voltage noise vn input=gnd,r l =4 ? ,av=2 f = 20 hz to 20 khz, v dd =5.0v - 79 - uv rms frequency fc v dd = 2.5v~5.5v - 250 - khz start-up time from shutdown z i v dd = 2.5v~5.5v - 1 - ms (*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
ly8010 rev. 2.0 3.3 w mono filterless class d audio power amplifier 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 3 total harmonic distortion + noise vs output power (4 ? ) figure 4 total harmonic distortion + noise vs output power (8 ? )
ly8010 rev. 2.0 3.3 w mono filterless class d audio power amplifier 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 5 noise level figure 6 freq. vs. response
ly8010 rev. 2.0 3.3 w mono filterless class d audio power amplifier 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 ? sd current vs sd voltage quiescent vs supply voltage shutdown current vs shutdown voltage 0 2 4 6 8 10 12 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 shutdown voltage - v i(sd) shutdown current - ua 2.5v 3.7v 5v quiescent current vs supply voltage 1 2 3 4 2.5 3 3.7 4.2 5 5.5 6 vdd - supply voltage - v i(q) - quiescent current - ma 8 ? 4 ? supply current vs output power (rl=4 ? ) supply current vs output power (rl=8 ? ) supply current vs output power 0 100 200 300 400 500 600 700 800 0 0.2 0.4 0.8 1.2 1.4 1.6 1.8 2 2.4 2.8 po - output power - w (rl=4 ? ) supply current - ma 2.5v(d) 3.7v(d) 5v(d) supply current vs output power 0 50 100 150 200 250 300 350 400 450 500 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 po - output power - w (rl=8 ? ) supply current - ma 2.5v(d) 3.7v(d) 5v(d) load resistance vs output power (thd+n=10%) load resistance vs output power (thd+n=1%) output power vs load resistance 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 4 ? 8 ? 12 ? 16 ? 20 ? 24 ? 28 ? 32 ? load resistance po - o utput p ow er 2.5v 3.7v 5v 6v 4.2v 5.5v output power vs load resistance 0 0.5 1 1.5 2 2.5 3 3.5 4 ? 8 ? 12 ? 16 ? 20 ? 24 ? 28 ? 32 ? load resistance po - output p ow er 2.5v 3.7v 5v 6v 4.2v 5.5v
ly8010 rev. 2.0 3.3 w mono filterless class d audio power amplifier 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 ? output power vs vdd (rl=4ohm) output power vs vdd (rl=8ohm) output power vs. vdd 0 0.8 1.6 2.4 3.2 4 4.8 2.5v 3.7v 4.2v 5v 5.5v 6v vdd-supply voltage-v (4 ? ) po-output power thd+n=10% thd+n=1% output power vs. vdd 0 0.4 0.8 1.2 1.6 2 2.4 2.8 2.5v 3.7v 4.2v 5v 5.5v 6v vdd-supply voltage-v (8 ? ) po-output power thd+n=10% thd+n=1% efficiency and output power (4ohm) 3.7v efficiency and output power (4ohm) 5.0v efficiency vs output power(rl=4 ohm) 0 10 20 30 40 50 60 70 80 90 0 0.1 0.3 0.5 0.7 0.9 1 1.2 1.3 1.6 1.7 po-output power(w) efficiency(%) vdd=3.7 efficiency vs output power(w) rl=4 ohm 0 10 20 30 40 50 60 70 80 90 0 0.1 0.4 0.7 1 1.3 1.6 1.9 2.2 2.5 2.8 po-output power(w) efficiency(%) vdd=5.0 efficiency and output power (8ohm) 3.7v efficiency and output power (8ohm) 5.0v efficiency vs output power(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 0.6 0.7 0.8 0.9 1 po-output power(w) efficiency(% ) vdd=3.7 efficiency vs output power(w) rl=8 ohm 0 10 20 30 40 50 60 70 80 90 100 0 0.1 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 po-output power(w) efficiency(%) vdd=5.0
ly8010 rev. 2.0 3.3 w mono filterless class d audio power amplifier 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 ? dissipation vs output power (4ohm) dissipation vs output power (8ohm) power dissipation vs output power 0 0.5 1 1.5 2 0 0.1 0.4 0.7 1 1.3 1.6 1.9 2.2 2.5 2.8 po - output power - w rl=4 ? pd - power dissipation - w (5v)pd (3.7v)pd power dissipation vs output power 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 0 0.1 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 po - output power - w rl=8 ? pd - power dissipation - w (5v)pd (3.7v)pd figure 7 thd+n & output power vs temperature (vdd=3v, rl= 8) 0.01 0.1 1 10 100 0.0001 0.001 0.01 0.1 1 po - output power (w) thd+n (%) 25c 80c 85c -20c -40c
ly8010 rev. 2.0 3.3 w mono filterless class d audio power amplifier 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 ? figure 8 thd+n & output power vs temperature (vdd=4.5v, rl= 8) 0.01 0.1 1 10 100 0.0001 0.001 0.01 0.1 1 10 po - output power (w) thd+n (%) 25c 80c 85c -20c -40c figure 9 thd+n & output power vs temperature (vdd=5.0v, rl= 8) 0 0 1 10 100 0.0001 0.001 0.01 0.1 1 10 po - output power (w) thd+n (%) 25c 80c 85c -20c -40c
ly8010 rev. 2.0 3.3 w mono filterless class d audio power amplifier 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 ? figure 10 fcc class-b (vertical) figure 11 fcc class-b (horizontal)
ly8010 rev. 2.0 3.3 w mono filterless class d audio power amplifier 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 ? figure 12 cispr class-b (vertical) figure 13 cispr class-b ( horizontal)
ly8010 rev. 2.0 3.3 w mono filterless class d audio power amplifier 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 ? application information fully differential amplifier the ly8010 is a fully differential amplifier with differ ential inputs and outputs. the fully differential amplifier consists of a differential amplifier and a common-mode am plifier. the differential amplifier ensures that the amplifier outputs a differential voltage on the output that is equal to the differential input times the gain. the common-mode feedback ensures that the common-m ode voltage at the output is biased around v dd /2 regardless of the common-mode voltage at the input. t he fully differential ly8010 can still be used with a single-ended input; however, the ly8010 should be used with differential inputs when in a noisy environment, like a wireless handset, to ensure maximum noise rejection. advantages of fully differential amplifiers input-coupling capacitors not required: the fully differential amplifier allows the inputs to be biased at voltage other than mid-supply. for example, if a codec has a midsupply lower than the midsupply of the ly8010, the common- mode feedback circuit will adjust, and the ly8010 outputs will still be biased at mids upply of the ly8010. the inputs of the ly8010 can be biased from 0.5 v to v dd - 0.8 v. if the inputs are biased outside of that range, input - coupling capacitors are required. midsupply bypass capacitor, c (bypass) , not required: the fully differential amplifier does not require a bypass ca pacitor. this is because any shift in the midsupply affects both positive and negative channels equa lly and cancels at the differential output. better rf-immunity: gsm handsets save power by turning on and shutting off the rf transmitter at a rate of 217 hz. the transmitted signal is picked-up on input and output traces . the fully differential amplifier cancels the signal much better than the typical audio amplifier. component selection figure 1 shows the ly8010 typical schematic with differential inputs and figure 2 shows the ly8010 with single-ended inputs. differential inputs should be used whenever possibl e because the single-ended inputs are much more susceptible to noise. table 1. typical component values reference description note ri 150k ? 1% tolerance resistors cs 1.0uf +22%,-80% ci 3.3 nf (10%) (1) ci is only needed for single-ended input or if v icm is not between 0.5 v and vdd - 0.8 v. c i = 3.3 nf (with ri = 150k ? ) gives a high-pass corner frequency of 321 hz. for example fc = 1 / ( 2 rici ) fc = 1 / ( 2 x 150k ? x 3.3nf) = 321.524 hz
ly8010 rev. 2.0 3.3 w mono filterless class d audio power amplifier 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 ? input resistors (ri) the input resistors (r i ) set the gain of the amplifier ac cording to equation equation 1. 150 k ? pre-amplifier gain = ----------- ri 150 k ? total gain = 2 x -------------- ???????????????????????.(1) ri 150 k ? a vd = 20 x log [2 x ( ----------- )] ri resistor matching is very important in fully differential amplifiers. the balance of the output on the reference voltage depends on matched ratios of the resistors. cmrr, psrr, and cancellation of the second harmonic distortion diminish if resistor mismatch occurs. theref ore, it is recommended 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 ly8010 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 ly8010 to operate at its best, and keeps a high voltage at the input making the inputs less susceptible to noise. for example table 2. 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 decoupling capacitor (cs) the ly8010 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 f, placed as close as possible to the device v dd lead works best. placing this decoupling capacitor close to the ly8010 is very important for the efficiency of the clas s-d amplifier, because any resistance or inductance in the trace between the device and the capacitor can ca use a loss in efficiency. for filtering lower-frequency noise signals, a 10 f or greater capacitor placed near the audio powe r amplifier would also help, but it is not required in most applications becaus e of the high psrr of this device.
ly8010 rev. 2.0 3.3 w mono filterless class d audio power amplifier 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 ? input capacitors (ci) the ly8010 does not require input coupling capacitors if the design uses a differential source that is biased from 0.5 v to v dd - 0.8 v (shown in figure 1). if the input signal is not biased within the recommended common-mode input range, if needing to use the input as a high pass filter (shown in figure 1), or if using a single-ended source (shown in figure 2), input coupling capacitors are required. the input capacitors and input resistors form a high-pass filter with the corner frequency, f c , determined in equation equation 2. 1 fc = -------- --------????????????????????????(2) 2 rici 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 blo ck low frequencies in this application. equation equation 3 is reconfigured to so lve for the input coupling capacitance. 1 ci = ---------- -------???????????????????????.(3) 2 rifc for example in the table 3 shows the external components. rin in connect with cin to create a high-pass filter. table 3. typical component values reference description note ri 150k ? 1% tolerance resistors ci 0.22uf 80%/?20% ci = 1 / ( 2 rifc) ci = 1 / ( 2 x150k ? x4.8hz)=0.221uf use 0.22uf summing input signals with the ly8010 most wireless phones or pdas need to sum signals at the audio power amplifier or just have two signal sources that need separate gain. the ly8010 makes it easy to sum signals or use separate signal sources with different gains. many phones now use the same s peaker for the earpiece and ringer, where the wireless phone would require a much lower gain for the phone ear piece than for the ringer. pdas and phones that have stereo headphones require summing of the right and left channels to output the stereo signal to the mono speaker. summing two single-ended input signals four resistors and three capacitors are needed for summing single-ended input signals. the gain and corner frequencies (f c1 and f c2 ) for each input source can be set independently (see equations equation 11 through equation 14, and figure 14). resistor, r p , and capacitor, c p , are needed on the in+ terminal to match the
ly8010 rev. 2.0 3.3 w mono filterless class d audio power amplifier 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 ? impedance on the in- terminal. the single-ended inputs must be driven by low impedance sources even if one of the inputs is not outputting an ac signal. v o 150 k ? gain 1 = -------- = 2 x ------ -------------????????????????(11) v i 1 ri1 vo 150k ? gain 2 = --------- = 2 x ---------- ---------???????????????..(12) v i 2 ri2 1 ci1 = ----------- --------????????? ?????????????...(13) 2 ri1fc1 1 ci2 = ----------- --------????????? ???????????..?....(14) 2 ri2fc2 c p = ci1 + ci2?????????????????????????..(15) ri1 x ri2 r p = ------------ ------??????????????????????..?(16) ri1 + ri2 figure 14. application schematic with ly8010 summing two single-ended input
ly8010 rev. 2.0 3.3 w mono filterless class d audio power amplifier 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 ? pcb layout all the external components must place very close to the ly8010. the input resistors need to be very close to the ly8010 input pins so noise does not couple on th e high impedance nodes betwee n the input resistors and the input amplifier of the ly8010. then place the deco upling capacitor cs, close to the ly8010 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 ly8010 should be as wide as possible to minimize trace resistance. if these trac es are too thin, the ly8010'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.
ly8010 rev. 2.0 3.3 w mono filterless class d audio power amplifier 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 19 ? ly8010 demo board artwork demo board application circuit figure 17. demo board application circuit demo board bom list ly8010 v2.1 bom list no. description reference note 1 resistor, 30k ? r1,r2 1/16w,1% 2 resistor, 150k ? r3 1/16w,1% 3 capacitor, 330pf(option) c7,c8 80%/ ? 20%, nonpolarized 4 capacitor, 390pf(option) c6 80%/ ? 20%, nonpolarized 5 capacitor, 0.1uf c4 80%/ ? 20%, nonpolarized 6 capacitor, 0.33uf c1,c2 80%/ ? 20%, nonpolarized 7 capacitor, 10.0uf c5 80%/ ? 20%, 6.3 v 8 chip bead 1k ? /100mhz(option) l1,l2,l3,l4 1000 ? (1k ? )25%/100mhz 9 ic u1 ly8010, dfn8 10 1*2 pin header j1 j1, open ? shutdown mode
ly8010 rev. 2.0 3.3 w mono filterless class d audio power amplifier 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 20 ? demo board artwork top silkscreen top layer composite view bottom layer
ly8010 rev. 2.0 3.3 w mono filterless class d audio power amplifier 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 21 ? package outline dimension 8 pin dfn package outline dimension

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