eua2034 ds2 034 ver1.0 jul. 2010 1 3-w/ch stereo filter-less class-d audio power amplifier with auto-recovery description the eua2034 is a high efficiency, 3w/channel stereo class-d audio power amplifier. a low noise, filterless pwm architecture eliminates the output filter, requiring only two external components for operation. operating from a single 5v supply, eua2034 is capable of delivering 3w/ channel of continuous output power to a 4 load with 10% thd+n. the eua2034 is available in space-saving sop-16 package. typical application circuit features unique modulation schema reduces emi emissions 3w output at 10% thd with a 4 load and 5v power supply low quiescent current and shutdown current low thd+n and low noise efficiency up to 87% short circuit protection with auto-recovery thermal protection optimized pwm output stage eliminates lc output filter available in space-saving sop-16 package rohs compliant and 100% lead(pb)-free halogen-free applications lcd monitors / tv projectors notebook computers portable speakers portable dvd players, game machines cellular phones/speaker phones figure1. v?mw`r?y?b? w w w . g o f o t e c h . c o m
eua2034 ds2034 ver1.0 jul. 2010 2 pin configurations package type pin con figurations sop-16 pin description pin sop-16 descr i ption -out_l 1 left channel negative output pgnd 2 power gnd +out_l 3 left channel positive output pvdd 4 power gnd mute 5 mute control input (active low) vdd 6 analog vdd inl 7 left channel input vref 8 internal analog reference, connect a bypass capacitor from vref to gnd nc 9 no connect inr 10 right channel input gnd 11 analog gnd shdn 12 shu tdown control input (active low) pvdd 13 power vdd +out_r 14 right channel positive output pgnd 15 power gnd -out_r 16 right channel negative output n ~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? w w w . g o f o t e c h . c o m
eua2034 ds2034 ver1.0 jul. 2010 3 ordering information order number package type markin g operating temperature range EUA2034DIR1 sop-16 xxxxx a2034 -40 c to +85c eua2034 le a d free code 1: lead free, halogen-free 0: lead packing r: tape & reel operating temperature range i: industry standard package type d: sop block diagram figure2. n ~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? w w w . g o f o t e c h . c o m
eua2034 ds2034 ver1.0 jul. 2010 4 absolute maximum ratings (1) supply voltage, avdd,pvdd ------------------------------------------------------------------------- -0.3 v to 6v input voltage, v i ---------------------------------------------------------------------------------- -0.3 v to v dd +0.3v junction temperature, t j ------------------------------------------------------------------------------ -40c to 150c storage temperature rang, t stg --------------------------------------------------------------------- -65c to 85c esd susceptibility ------------------------------------------------------------------------------------------ 2kv lead temperature 1,6 mm (1/16 inch) from case for 10 seconds --------------------------------------- 260c thermal resistance ja (sop-16) --------------------------------------------------------------------------------------------- 80c/w recommended operating conditions (2) min max unit supply voltage 2.5 5.5 v high-level input voltage 1.4 v low-level input voltage 0.35 v operating free-air temperature, t a -40 85 c note (1): stress beyond those listed under absolute maximum ratings may damage the device. note (2): the device is not guaranteed to function outside the recommended operating conditions. electrical characteristics v dd =5v, gain=24db, r l =8, t a = +25c (unless otherwise noted) eua2034 symbol parameter conditions min. typ. max. unit v in supply power 2.5 5 .5 v v dd =5v 3 v dd =3.6v 1.42 thd+n=10%, f=1khz, r l =4 v dd =3v 1 w v dd =5v 2.3 v dd =3.6v 1.15 thd+n=1%, f=1khz, r l =4 v dd =3v 0.8 w v dd =5v 1.72 v dd =3.6v 0.85 thd+n=10%, f=1khz, r l =8 v dd =3v 0.6 w v dd =5v 1.4 v dd =3.6v 0.7 p o output power thd+n= 1%, f=1khz, r l =8 v dd =3v 0.48 w v dd =5v,p o =0.5w, r l =8 0.21 v dd =3.6v,p o =0.5w, r l =8 f=1khz 0.19 % v dd =5v,p o =1w, r l =4 0.27 thd+n total harmonic distortion plus noise v dd =3.6v,p o =1w, r l =4 f=1kh z 0.28 % gv gain 24 db f=100hz -50 psrr power supply ripple rejection v dd =5v, inputs ac-grounded with c in = 0.47 f f=1k h z -50 db n ~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? w w w . g o f o t e c h . c o m
eua2034 ds2034 ver1.0 jul. 2010 5 electrical characteristics v dd =5v, gain=24db, r l =8, t a = +25c (unless otherwise noted) eua2034 symbol parameter conditions min typ max. unit cs crosstalk v dd =5v, p o =0.5w, r l =8 ,gv=24db f=1k hz -90 db snr signal-to-noise ratio v dd =5v,vorms=1v, gv=24d b f=1khz 80 db a-weighting 100 vn output noise v dd =5v, inputs ac-grounded with c in = 0.47 f no a- weighting 130 v r l =8 ,thd=10% 87 efficiency r l =4 ,thd=10% f=1k hz 83 % v dd =5v 9.3 i q quiesc ent current v dd =3.6v no loa d 8 ma v dd =5v 3.8 i mute mute current v dd =3.6v 3.3 m a v dd =5v 3 10 i shdn shutdown current v dd =3.6v 1 a f sw switching frequency v dd =5v 250 35 0 400 khz v os output offset voltage v dd =5v 25 50 mv nmos 200 350 r dson static drain-source on-state resistance v dd =5v pmos 3 00 400 m i ih high-l evel input current v dd =5v vi= v dd 1 a i il low-le vel input current v dd =5v vi= 0v 1 a n ~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? w w w . g o f o t e c h . c o m
eua2034 ds2034 ver1.0 jul. 2010 6 typical operating characteristics figure3. figure 5 . figure7. figure4. figure6. figure 8 . n ~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? w w w . g o f o t e c h . c o m
eua2034 ds2034 ver1.0 jul. 2010 7 figure9. figure11. figure13. figure10. figure12. fi gure 1 4. n ~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? w w w . g o f o t e c h . c o m
eua2034 ds2034 ver1.0 jul. 2010 8 figure 1 5. figure16. n ~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? w w w . g o f o t e c h . c o m
eua2034 ds203 4 ver1.0 jul. 2010 9 ap p l ication information input resistors (r i ) the input resistors (r i ) set the gain of the amplifier according to equation (1). ---------------------(1) the eua2034 sets maximum r f =142k , minimum r i =18k , so the maximum closed-gain is 24db. decoupling capacitor (c s ) the eua2034 is a high-performance class-d audio amplifier that requires adequate power supply decoupling to ensure the efficiency is high and total harmonic distortion (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 pv dd lead works best. placing this decoupling capacitor close to the eua2034 is important for the efficiency of the class-d amplifier, because any resistance or inductance in the trace between the device and the capacitor can cause a loss in efficiency. for filtering lower-frequency noise signals, a 20 f or greater capacitor placed near the audio power amplifier would also help. input capacitors (c i ) the input capacitors and input resistors form a high-pass filter with the corner frequency, fc, determined in equation (2). --------------------------------------------(2) the value of the input capacitor is important to consider 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. not using input capacitors can increase output offset. equation (3) is used to solve for the input coupling capacitance. --------------------------------------------(3) 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 impedance mismatch at the corner frequency and below. shdn op eration connect shdn to a logic high for normal operation. pulling shdn lo w causes the outputs to mute and the amplifier to enter a low-current state. never leave shdn u n connected, because amplifier operation would be unpredictable. for the best power-off pop performance, place the amplifier in the shutdown or mute mode prior to removing the power supply voltage. mute o peration the mute p in only control the output state and does not shutdown the eua2034. a logic low on this terminal disables the outputs. a logic high on this pin enables the outputs. this terminal may be used as a quick disable/enable of outputs when changing channels on a television or transitioning between different audio sources. the mute p in can be left floating due to the internal pull-up. component location place all the external components very close to the eua2034. placing the decoupling capacitor, cs, close to the eua2034 is important for the efficiency of the class-d amplifier. any resistance or inductance in the trace between the device and the capacitor can cause a loss in efficiency. filter free operation and ferrite bead filters a ferrite bead filter can often be used if the design is failing radiated emissions without an lc filter and the frequency sensitive circuit is greater than 1 mhz. this filter functions well for circuits that just have to pass fcc and ce because fcc and ce only test radiated emissions greater than 30 mhz. when choosing a ferrite bead, choose one with high impedance at high frequencies, and very low impedance at low frequencies. in addition, select a ferrite bead with adequate current rating to prevent distortion of the output signal. use an lc output filter if there are low frequency (< 1 mhz) emi sensitive circuits and/or there are long leads from amplifier to speaker. figure 17 shows typical ferrite bead and lc output filters. figure17. typical ferrite chip bead filter short circuit auto-recovery when a short circuit event happens, the eua2034 goes to shutdown mode and tries to reactivate itself after 4ms. this auto-recovery will continue until the short circuit events is removed. ( ) i c i r2 1 c f p = ( ) c f i r2 1 i c p = ( ) ? ? ? ? ? ? * *= i r/ f r2lo g20 vd a n ~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? w w w . g o f o t e c h . c o m
eua2034 ds203 4 ver1.0 jul. 2010 10 pack agi ng information sop-16 millimeters inches symb ols min. max. min. max. a 1.3 5 1.75 0.053 0.069 a1 0. 10 0.25 0.004 0.010 b 0.3 1 0.51 0.012 0.020 d 9.9 0 0.389 e1 3. 90 0.153 e 5.7 9 6.20 0.228 0.244 e 1.2 7 0.050 l 0.3 8 1.27 0.015 0.050 n ~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? w w w . g o f o t e c h . c o m
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