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ly8006 3.3 w mono filterless class d audio power amplifier rev. 2.2 compatible with ly8891 single-ended input 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 ? 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, short to gnd, short to vdd) ? low noise during turn-on and turn-off transitions. ? easy upgrade class ab (ly8891) to class d (pin to pin replace). ? lead free and green package available. (rohs compliant) ? space saving package - 8-pin msop package. application ? portable electronic devices ? mobile phones ? pdas general description the ly8006 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 ly8006 is designed to meet of portable electronic devices. the ly8006 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. in cellular handsets, the earpiece, speaker phone, and melody ringer can each be driven by the ly8006.the gain of the ly8006 is externally configurable which allows independent gain control from multiple sources by summing the signals. output pin short circuit ( short to output pin, short to ground and short to vdd ) protection prevent the device from damage during fault conditions. pin configuration
ly8006 3.3 w mono filterless class d audio power amplifier rev. 2.2 compatible with ly8891 single-ended input 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 pin no. symbol msop description shutdown 1 shutdown the device. (when low level is shutdown mode). bypass 2 bypass pin nc 3 no internal connection -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 LY8006UL mono msop8 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 btl
ly8006 3.3 w mono filterless class d audio power amplifier rev. 2.2 compatible with ly8891 single-ended input 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 ? application circult figure 1. application schematic with single-ended input configuration single-end input with pre-amplifier gain = (150 k ? / 5 k ? ) * 2 = 60 figure 2. application schematic with single-ended input configuration single-end input with pre-amplifier gain = [150 k ? / ( 5 k ? + ri )] * 2
ly8006 3.3 w mono filterless class d audio power amplifier rev. 2.2 compatible with ly8891 single-ended input 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 ? 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. *2 max. unit supply voltage v dd 2.5 - 5.5 high-level input voltage v ih shutdown 1.3 - v dd 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 4.5 v dd = 3.6v, no load - 3.0 - quiescent current i q v dd = 2.5v, no load - 2.5 3.2 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 ? [300k ? / (5k ? +ri)] x2 v/v (*1)the audio amplifier?s gain is determined by pre-amplifier gain = [150k ? / ( 5k ? + ri )] x 2 total gain = { [150k ? / ( 5k ? + ri )] x 2 } x 2 where ri is the external serial resistance at the input pin. (*2)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
ly8006 3.3 w mono filterless class d audio power amplifier rev. 2.2 compatible with ly8891 single-ended input 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 ? operating characteristics (ta = 25 ,unless otherwise noted) parameter symbol test condition min. typ. *2 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 po thd+n= 1%, f = 1 khz, r l = 8 ? v dd =2.5v - 0.1 - w signal-to-noise ratio snr r l = 48 ? , input=gnd, 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 - 79.4 - uv rms frequency fc v dd = 2.5v~5.5v - 250 - khz c bypass = 1.0 f - 360 - c bypass = 0.47 f - 180 - c bypass = 0.33 f - 144 - c bypass = 0.22 f - 104 - c bypass = 0.1 f - 48 - v dd = 5.0v c bypass =none - 32 - c bypass = 1.0 f - 250 - c bypass = 0.47 f - 128 - c bypass = 0.33 f - 108 - c bypass = 0.22 f - 72 - c bypass = 0.1 f - 48 - start-up time from shutdown z i v dd = 3.7 v c bypass =none - 32 - ms (*2)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
ly8006 3.3 w mono filterless class d audio power amplifier rev. 2.2 compatible with ly8891 single-ended input 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 ? typical performanc e characteristics figure 3 total harmonic distortion + noise vs output power (4 ? ) figure 4 total harmonic distortion + noise vs output power (8 ? )
ly8006 3.3 w mono filterless class d audio power amplifier rev. 2.2 compatible with ly8891 single-ended input 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 ? figure 5 noise level figure 6 freq. vs. response
ly8006 3.3 w mono filterless class d audio power amplifier rev. 2.2 compatible with ly8891 single-ended input 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 ? sd current vs sd voltage quiescent vs supply voltage sd current vs sd vo;tage 0 20 40 60 80 100 120 140 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 voltage sd current 2.5v 3.6v 5v quiescent current vs supply voltage 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 4 2.5 3 3.5 4 4.5 5 5.5 vdd-supply voltage-v iq-quiescent current-ma no load 8 supply current vs output power (rl=4 ? ) supply current vs output power (rl=8 ? ) supply current vs output power 0 100 200 300 400 500 600 700 800 900 1000 0 0.2 0.4 0.8 1.2 1.6 2 2.4 2.8 3 po-output power-w rl=4 ohm supply current-ma 2.5v 3.6v 5v 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 power-w rl=8ohm supply current -ma 2.5v 3.6v 5v load resistance vs output power (thd+n=10%) load resistance vs output power (thd+n=1%) output power vs rl 0 0.5 1 1.5 2 2.5 3 4 8 12 16 20 24 28 32 rl po-output power 2.5v 3v 3.6v 5v output power vs rl 0 0.5 1 1.5 2 2.5 4 8 12 16 20 24 28 32 rl po-output power 2.5v 3v 3.6v 5v
ly8006 3.3 w mono filterless class d audio power amplifier rev. 2.2 compatible with ly8891 single-ended input 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 ? output power vs vdd (rl=8ohm) output power vs vdd (rl=4ohm) output power vs.vdd(rl=8ohm) 0 0.4 0.8 1.2 1.6 2 2.4 2.8 2.5 3.6 5 5.5 6 vdd-supply voltage-v po-output power thd+n=10% thd+n=1% output power vs.vdd(rl=4ohm) 0 0.5 1 1.5 2 2.5 3 3.5 4 2.5 3.6 5 5.5 6 vdd-supply voltage-v po-output power thd+n=10% thd+n=1% efficiency and output power (8ohm) 3.6v efficiency and output power (8ohm) 5.0v efficiency vs po (rl=8 ohm) 0 20 40 60 80 100 0 0.1 0.2 0.3 0.4 0.5 po-w efficiency(%) vdd=3.6v efficiency vs po(rl=8 ohm) 0 20 40 60 80 100 0 0.2 0.4 0.6 0.8 1 1.2 1.4 po-w efficiency(%) vdd=5v efficiency and output power (4ohm) 3.6v efficiency and output power (4ohm) 5.0v efficiency vs po (rl=4 ohm) 0 20 40 60 80 100 0 0.1 0.2 0.3 0.4 0.5 po-w efficiency(%) vdd=3.6v efficiency vs po(rl=4 ohm) 0 20 40 60 80 100 0 0.2 0.4 0.6 0.8 1 1.2 1.4 po-w efficiency(%) vdd=5v
ly8006 3.3 w mono filterless class d audio power amplifier rev. 2.2 compatible with ly8891 single-ended input 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 ? dissipation vs output power (8ohm) dissipation vs output power (4ohm) pd vs po 0 0.04 0.08 0.12 0.16 0.2 0 0.2 0.4 0.6 0.8 1 1.2 1.4 po-w (rl=8 ohm) pd-w pd(5v) pd(3.6v) pd vs po 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 (rl=8 ohm) pd-w pd(5v) pd(3.6v) figure 7 thd+n & output power vs temperature (vdd=3v, rl= 8) 0.01 0.1 1 10 100 0.001 0.01 0.1 1 po-output power (w) thd+n (%) 25c 80c 85c -20c -40c
ly8006 3.3 w mono filterless class d audio power amplifier rev. 2.2 compatible with ly8891 single-ended input 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 8 thd+n & output power vs temperature (vdd=4.5v, rl= 8) 0.01 0.1 1 10 100 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) 0.01 0.1 1 10 100 0.001 0.01 0.1 1 10 po-output power (w) thd+n (%) 25c 80c 85c -20c -40c
ly8006 3.3 w mono filterless class d audio power amplifier rev. 2.2 compatible with ly8891 single-ended input 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 ? application information input resistors (ri) and gain the input resistors (r i ) set the gain of the amplifier according to the equation. pre-amplifier gain = (rf / ri) x 2 = [150k ? / ( 5k ? + ri )] x 2 total gain = [ (rf / ri) x 2 ] x 2 = { [150k ? / ( 5k ? + ri )] x 2 } x 2 a vd = 20 x log {2 x [ (rf /ri ) x2 ] } 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 ly8006 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 ly8006 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 ? ) 300 150 100 75 50 37.5 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 ly8006 using a single-ended source, so the input c oupling capacitors are required. 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.
ly8006 3.3 w mono filterless class d audio power amplifier rev. 2.2 compatible with ly8891 single-ended input 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 ? for example 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 * 150k ? * 4.8hz)=0.221uf use 0.22uf two single-ended input signals two resistors and two 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. pre-amplifier gain 1 = [150k ? / ( 5k ? + ri1 )] x 2 pre-amplifier gain 2 = [150k ? / ( 5k ? + ri2 )] x 2 ci1 = 1 / ( 2 ri1 fc1 ) ci2 = 1 / ( 2 ri2 fc2 ) figure 10. application schematic with two single-ended inputs configuration
ly8006 3.3 w mono filterless class d audio power amplifier rev. 2.2 compatible with ly8891 single-ended input 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 ? pcb layout all the external components must place very close to the ly8006. the input resistors need to be very close to the ly8006 input pins so noise does not couple on th e high impedance nodes betwee n the input resistors and the input amplifier of the ly8006. then place the deco upling capacitor cs, close to the ly8006 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 ly8006 should be as wide as possible to minimize trace resistance. if these trac es are too thin, the ly8006'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. LY8006UL demo board artwork demo board application circuit figure 11. demo board application circuit
ly8006 3.3 w mono filterless class d audio power amplifier rev. 2.2 compatible with ly8891 single-ended input 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 ? demo board bom list ly8006 v2.1 bom list no. description reference note 1 resistor, 30k ? 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 c2 80%/ ? 20%, nonpolarized 7 capacitor, 1.0uf c3 80%/ ? 20%, nonpolarized 8 capacitor, 10.0uf c5 80%/ ? 20%, 6.3 v 9 chip bead 1k ? /100mhz(option) l1,l2,l3,l4 1000 ? (1k ? )25%/100mhz 10 ic u1 LY8006UL, msop8 11 1*2 pin header j1 j1, open ? shutdown mode demo board artwork top silkscreen top layer composite view bottom layer
ly8006 3.3 w mono filterless class d audio power amplifier rev. 2.2 compatible with ly8891 single-ended input 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 ? package outline dimension 8 pin msop package outline dimension

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