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ly8212 rev. 1.5 3.3w stereo & fm enhancement 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 ? 3.3w/ch into 4 ? from 5.5v power supply at thd+n = 10%. ? 2.2v~5.5v power supply. ? low shutdown current. ? low quiescent current. ? minimum external components. ? no output filter required for inductive loads. ? short-circuit protection and automatic recovery. ? over-heat protection and automatic recovery. ? low noise during turn-on and turn-off transitions. ? fm enhancement function. ? lead free and green package available. (rohs compliant) ? package : 16pin 150mil sop, 16pin 4x4 qfn. ? application ? portable electronic devices ? mobile phones, pdas ? dvd/cd players, tft lcd tvs/monitors ? usb audio, audio system ? ipod dock. ? general description the ly8212 is a high efficiency, high quality 3.3w stereo class d audio power amplifier which can operate fm enhance function to get good performance in fm mode. it is a low noise, filterless pwm architecture eliminates the output filter, reducing external component count, system cost (bom cost), and simplify design. the device was designed to meet of multimedia application includes mini speaker and other portable electronic devices. the ly8212 is a single 5.5v power supply, it is capable of driving 4 ? speaker load at a continuous average output of 3.3w/ch with 10% thd+n. the device also features an internal thermal shutdown protection and output pin short circuit ( short to output pin, short to ground and short to vdd ) protection prevent the device from damage during fault conditions. the ly8212 is easily to be used in various portable applications and products. such as fm speaker, mp3, mp4 and mp5 media players. ? pin configuration ly8212 sop16 pin configuration (top view)
ly8212 rev. 1.5 3.3w stereo & fm enhancement 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 ? ly8212 qfn16 pin configuration (top view) ? pin description pin no. symbol sop16 qfn16 description vo-(l) 1 15 negative(-) btl output of left channel. gnd 2/9/15 7/13/16 ground vo+(l) 3 1 positive(+) btl output of left channel. v dd 4/13 2/11 power supply of left and right channel. shutdown 5 3 shutdown control pin. (when low level is shutdown mode). agnd 6 4 analog gnd of left and right channel. inl 7 5 input of left channel. bypass 8 6 bypass pin. inr 10 8 input of right channel. av dd 11 9 analog power supply of left and right channel. fm enhance 12 10 fm enhance pin. (when high level is fm enhance mode). vo+(r) 14 12 positive(+) btl output of right channel. vo-(r) 16 14 negative(-) btl output of right channel.
ly8212 rev. 1.5 3.3w stereo & fm enhancement 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 ? ordering information feature ordering code speaker channels pin/ package output power (thd+n=10%) input type output type fm enhance LY8212SL stereo sop16 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 yes ly8212el stereo qfn16 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 yes ? typical application circuit figure 1. LY8212SL typical application circuit
ly8212 rev. 1.5 3.3w stereo & fm enhancement 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 power supply voltage range v dd 6.0 v operating temperature t a -40 to 85 (i grade) input voltage range 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. *2 max. unit power supply voltage v dd - 2.2 - 5.5 v v dd = 5.5v, no load - 11 - v dd = 3.7v, no load - 9 - quiescent current (fm enhance pin=low) i q v dd = 2.5v, no load - 7 - ma shutdown current i sd v shutdown Q 0.8v, v dd = 2.5v to 5.5v - 0.1 - a shutdown voltage input high v sdih - 1.2 - - shutdown voltage input low v sdil - - - 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 shutdown temp. - 180 - thermal shutdown temperature t sd restore temp. - 135 - ? operating characteristics (1) (t a = 25 ) parameter symbol test condition min. typ. *2 max. unit v dd =5.5v - 3.3 - v dd =5.0v - 2.7 - thd+n=10% v dd =3.7v - 1.4 - v dd =5.5v 2.6 v dd =5.0v - 1.7 - r l = 4 ? , f = 1khz, thd+n=1% v dd =3.7v - 1.2 *1 - v dd =5.5v 2.0 v dd =5.0v - 1.6 - thd+n=10% v dd =3.7v - 0.8 - v dd =5.5v 1.6 v dd =5.0v - 1.3 - output power / channel p o r l = 8 ? , f = 1khz, thd+n=1% v dd =3.7v - 0.6 - w (*1)r l = 4 ? ,f = 1khz, vdd=3.7v, output power=1.2w@ thd+n=2% (*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
ly8212 rev. 1.5 3.3w stereo & fm enhancement 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 (2) (t a = 25 ) parameter symbol test condition min. typ. *2 max. unit f=1khz - -62.4 - power supply rejection ratio psrr av=10 v/v ,input=gnd ri=33k, ci=0.47 f r l =4ohm, v dd =5.0v f=217hz - -62 - db l ? r - 85.4 - crosstalk cs r l = 4 ? ,f=1khz, 0.25w=0db, v dd =5.0v r ? l - 77.6 db signal-to-noise ratio snr r l = 8 ? ,av=2 v/v, 1.0w=0db v dd =5.0v - 86.8 - db output voltage noise vn v dd = 5.0v, r l = 8 ? , av=2 v/v, inputs=gnd, f = 20hz to 20khz, no weighting - 128.7 - uv c bypass = 4.7 f - 300 - c bypass = 2.2 f - 156 - c bypass = 1.0 f - 138 - c bypass =0.47 f - 72 - c bypass = 0.22 f - 40 - c bypass =0.1 f - 32 - v dd = 5.0v c bypass =none - 22 - c bypass = 4.7 f - 236 - c bypass = 2.2 f - 140 - c bypass = 1.0 f - 128 - c bypass =0.47 f - 63 - c bypass = 0.22 f - 36 - c bypass =0.1 f - 28 - start-up time from shutdown z i v dd = 3.7 v c bypass =none - 22 - ms frequency fc v dd =2.5v~5.5v - 245 - khz efficiency f=1khz, rl=8 ? , output=1.4w - 88 - % total gain *3 gv v dd = 2.5v to 5.5v [150k ? / (5k ? +ri)] x4 v/v (*2)typical values are included for refer ence only and are not guaranteed or tested. typical values are measured at vcc = vcc(typ.) and t a = 25 (*3)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.
ly8212 rev. 1.5 3.3w stereo & fm enhancement 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 2 total harmonic distortion + noise vs output power (4 ? ) figure 3 total harmonic distortion + noise vs output power (8 ? )
ly8212 rev. 1.5 3.3w stereo & fm enhancement 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 4 snr vs. noise level figure 5 crosstalk
ly8212 rev. 1.5 3.3w stereo & fm enhancement 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 ? quiescent current vs. supply voltage quiescent current vs supply voltage fm enhance=disable 4 6 8 10 12 14 16 18 20 2.5 3 3.5 4 4.5 5 5.5 vdd - supply voltage - v i(q) - quiescent current - ma no load 4 ? , 2ch 8 ? , 2ch quiecent current vs supply voltage fm enhance=enable 4 6 8 10 12 14 16 18 20 2.5 3 3.5 4 4.5 5 5.5 vdd - supply voltage - v i(q) - quiescent current - ma no load 4 ? , 2ch 8 ? , 2ch sd current vs. sd voltage shutdown current vs shutdown voltage fm enhance=disable 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 3.7v 5v shutdown current vs shutdown voltage fm enhance=enable 0 20 40 60 80 100 120 140 160 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 3.7v 5v supply current vs. output power (rl=4 ? ) supply current vs output power fm enhance=disable 0 100 200 300 400 500 600 700 800 900 1234567891 0 po-output power-w (rl=4 ohm) supply current-ma 2.5v 3.7v 5.0v supply current vs output power fm enhance=enable 0 100 200 300 400 500 600 700 800 900 1000 12345678910 po-output power-w (rl=4 ohm) supply current-ma 2.5v 3.7v 5.0v
ly8212 rev. 1.5 3.3w stereo & fm enhancement 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 ? supply current vs. output power (rl=8 ? ) supply current vs output power fm enhance=disable 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 2 po - output power - w (rl=8 ? ) supply current - ma 2.5v 3.7v 5.0v supply current vs output power fm enhance=enable 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 2 po - output power - w (rl=8 ? ) supply current - ma 2.5v 3.7v 5.0v load resistance vs. output power (thd+n=1%) output power vs load resistance fm enhance=disable 0 0.5 1 1.5 2 2.5 3 4 ? 8 ? 12 ? 16 ? 20 ? 24 ? 28 ? 32 ? rl - load resistance - ? freq = 1khz, gain = 2v/v, thd+n = 1% po-output power 3.7v 5v 5.5v output power vs load resistance fm enhance=enable 0 0.5 1 1.5 2 2.5 4 ? 8 ? 12 ? 16 ? 20 ? 24 ? 28 ? 32 ? rl - load resistance - ? freq = 1khz, gain = 2v/v, thd+n = 1% po - output power - w 2.5v 3.7v 5v 5.5v load resistance vs. output power (thd+n=10%) output power vs load resistor fm enhance=disable 0 0.5 1 1.5 2 2.5 3 3.5 4 ? 8 ? 12 ? 16 ? 20 ? 24 ? 28 ? 32 ? rl - load resistance - ? freq = 1khz, gain = 2v/v, thd+n = 10% po-output power 2.5v 3.7v 5v 5.5v output power vs load resistance fm enhance=disable 0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3 3.3 4 ? 8 ? 12 ? 16 ? 20 ? 24 ? 28 ? 32 ? rl - load resistance - ? freq = 1khz, gain = 2v/v, thd+n = 10% po - output power - w 2.5v 3.7v 5v 5.5v
ly8212 rev. 1.5 3.3w stereo & fm enhancement 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 ? output power vs. supply voltage (rl=4 ? ) output power vs supply voltage fm enhance=disable 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 2.5 3.7 5 5.5 6 vdd - supply voltage - v rl=4 ? , f=1k hz, gain=2 v/v po-output power thd+n=10% thd+n=1% output power vs supply voltage fm enhance=enable 0 0.5 1 1.5 2 2.5 3 3.5 4 2.53.755.56 vdd - supply voltage - v rl=4 ? , f=1k hz, gain=2 v/v po - output power - w thd+ n=10% thd+ n=1% output power vs. supply voltage (rl=8 ? ) output power vs supply voltage fm enhance=disable 0 0.4 0.8 1.2 1.6 2 2.4 2.8 2.53.755.56 vdd - supply voltage - v rl=8 ? , f=1k hz, gain=2 v/v po-output power thd+n=10% thd+n=1% output power vs supply voltage fm enhance=enable 0 0.4 0.8 1.2 1.6 2 2.4 2.8 2.5 3.7 5 5.5 6 vdd - supply voltage - v rl=8 ? , f=1k hz, gain=2 v/v po - output power - w thd+ n= 10% thd+ n= 1% power dissipation vs. output power (8ohm) power dissipation vs output power fm enhance=disable 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 0 0.2 0.4 0.6 0.8 1 1.2 1.4 po - output power - w rl=8 ? p d - power dissipation - w 5v 3.7v power dissipation vs output power fm enhance=enable 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 0 0.2 0.4 0.6 0.8 1 1.2 1.4 po - output power - w rl=8 ? pd - power dissipation - w 5v 3.7v
ly8212 rev. 1.5 3.3w stereo & fm enhancement 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 ? efficiency vs. output power (rl=4 ? ,vdd=3.7v) efficiency vs. output power (rl=4ohm,vdd=5v) efficiency vs output power(w) rl=8 ohm,vdd=3.7v 0 10 20 30 40 50 60 70 80 90 0 0.1 0.2 0.3 0.4 0.5 po-output power(w) efficiency(%) fm enhance=disable fm enhance=enable efficiency vs output power(w) rl=8 ohm,vdd=5v 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-output power(w) efficiency(%) fm enhance=disable fm enhance=enable
ly8212 rev. 1.5 3.3w stereo & fm enhancement 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 ? ? application information input resistors (ri) and gain the ly8212 have two internal amplifier stages. the pre-am plifier gain is externally configurable, while the total gain is internally fixed. the closed-loop gain of the pre-amplifier gain is set by selecting 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) x 2 total gain = [(rf / ri ) x 2] x 2 a vd = 20 x log [4 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 ly8212 to limit noise injection on the high -impedance nodes. for optimal performance the gain should be set to 4 v/v or lower. lower gain allows the ly8212 to operate at its best, for example table 1. typical total gain and a vd values rf (k ? ) 150 150 150 150 150 ri (k ? ) 150 75 50 25 15 pre amp. gain 2 4 6 12 20 total gain 4 8 12 24 40 a vd (db) 12.04 18.06 21.58 27.60 32.04 input capacitors (ci) the ly8212 using single-end source, so the input coupling capacitors are required. the input capacitors and input resistors form a high-pass f ilter 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.
ly8212 rev. 1.5 3.3w stereo & fm enhancement 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 ? 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 x 150k ? x 4.8hz)=0.221uf use 0.22uf decoupling capacitor the ly8212 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 10.0uf, placed as close as possible to the device v dd lead works best. placing 0.1uf decoupling capacitor close to the ly8212 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 ly8212 has a built-in over-heat pr otection circuit at fm enhance pin enable, it will turn off all power output when the chip temperature over 180 , the chip will return to normal operation automatically after the temperature cool down to 135 . fm enhance the ly8212 has a built-in fm enhance function. when fm signal is poor. enable (active to high) the fm enhance pin will improve the signal obviously. but enable the pin will reduce ly8212 efficiency. therefore recommend if fm function is not to use. disable (active to low) the fm enhance pin is very important. ? pcb layout all the external components must place very close to the ly8212. the input resistors need to be very close to the ly8212 input pins so noise does not couple on th e high impedance nodes betwee n the input resistors and the input amplifier of the ly8212. then place the deco upling capacitor cs, close to the ly8212 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 ly8212 should be as wide as possible to minimize trace resistance. if these trac es are too thin, the ly8212'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.
ly8212 rev. 1.5 3.3w stereo & fm enhancement 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 ? ? demo board information demo board application circuit figure 6. demo board application circuit demo board bom list ly8212 v2.1 bom list no. description reference note 1 resistor, 100k ? r7,r9 1/16w,1% 2 resistor, 51k ? r1,r2 1/16w,1% 3 resistor, 0 ? r8,r12 1/16w,1% 4 capacitor, 0.1uf c1,c2,c4,c5 80%/ ? 20%, nonpolarized 5 capacitor, 4.7uf c3 80%/ ? 20%, nonpolarized 6 capacitor, 10.0uf c7 80%/ ? 20%, 6.3v 7 capacitor, 220.0uf c6 25 v,105 ,8x11 8 ic u1 LY8212SL, sop16 9 1*2 pin header j3,j6 pitch 2.54 mm
ly8212 rev. 1.5 3.3w stereo & fm enhancement 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 ? demo board artwork top silkscreen top layer composite view bottom layer
ly8212 rev. 1.5 3.3w stereo & fm enhancement 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 ? ? package outline dimension sop 16 pin package outline dimension
ly8212 rev. 1.5 3.3w stereo & fm enhancement 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 ? qfn4x4 16 pin package outline dimension

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