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unisonic technologies co., ltd pa3431 cmos ic www.unisonic.com.tw 1 of 11 copyright ? 2008 unisonic technologies co., ltd qw-r502-185.a 2w stereo audio amplifier ? description as a stereo audio speaker which is operating on a single 5v supply, the utc pa3431 is capable of delivering 2w of output power per channel into 4 ? loads in bridge-tied load (btl) mode with less than 1% thd+n. way of two terminals (gain0 and gain1) can configured and control the amplifier gain. it also provided btl gain settings of 6 db, 10 db, 15.6 db, and 21.6 db (inverting). other features: the shdn mode is supported to disable utc pa3431 for the low current consumption applications; the current consumption can be reduced to typically 150a. ? features * 2w output power into 4 ? load from 5v supply each channel * gain control internally * differential input fully * depop circuitry * shutdown protection thermally *pb-free plating product number: pa3431l ? ordering information ordering number normal lead free plating package packing PA3431-N20-R pa3431l-n20-r htssop-20 tape reel pa3431-n20-t pa3431l-n20-t htssop-20 tube
pa3431 cmos ic unisonic technologies co., ltd 2 of 11 www.unisonic.com.tw qw-r502-185.a ? pin configuration 1 2 3 4 5 6 7 gnd gain0 gain1 l out + l in - pv dd r in + 8 9 10 l out - l in + bypass 20 19 18 17 16 15 14 gnd shutdown r out + r in - v dd pv dd r out - 13 12 11 gnd nc gnd ? pin description pin no. pin name i/o description 1,11 13,20 gnd ground 2 gain0 i bit 0 of gain control 3 gain1 i bit 1 of gain control 4 l out + o positive output for left channel 5 l in - i negative differential input for left channel 6,15 pv dd i supply voltage 7 r in + i positive differential input for right channel 8 l out - o negative output for left channel 9 l in + i positive differential input for left channel 10 bypass tap to voltage divider for internal mid supply bias generator 12 nc nothing connection 14 r out - o negative output for right channel 16 v dd supply voltage 17 r in - i negative differential input for right channel 18 r out + o positive output for right channel 19 shutdown i in shutdown mode when held low
pa3431 cmos ic unisonic technologies co., ltd 3 of 11 www.unisonic.com.tw qw-r502-185.a ? absolute maximum ratings parameter symbol ratings unit supply voltage v cc 6 v power dissipation (t a 25
) p d 2.7 w junction temperature t j +150
operating temperature t opr -40 ~ +85
storage temperature range t stg -65 ~ +150
note absolute maximum ratings are those values beyo nd which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. ? electrical characteristics (ta=25
, unless otherwise specified) parameter symbol test conditions min typ max unit dc electrical characteristics supply voltage v dd 4.5 5 5.5 v high-level input voltage v ih shutdown, gain0, gain1 2 v low-level input voltage v il shutdown, gain0, gain1 0.8 v dc differential output voltage v o(diff) v dd = 5v,gain = 2 5 50 mv supply current in mute mode i dd v dd = 5v, stereo btl 7.5 11 ma supply current, shutdown mode i dd(sd) v dd = 5v 160 300 a ac electrical characteristics (v dd = 5.0v, r l = 4 ? ) thd =1%, btl, r l = 4 ? , g=-2v/v 2 thd =1%, btl, r l = 8 ? , g=-2v/v 1.2 thd =10%, btl, r l = 4 ? , g=-2v/v 2.5 output power p out thd = 10%, btl,r l = 8 ? , g=-2v/v 1.6 w p out = 1.6w, btl,r l = 4 ? , g=-2v/v 100 total harmonic distortion plus noise thd+n p out = 1w, btl, r l = 8 ? , g=-2v/v 60 m% max output power bandwidth b om thd = 5% 15 khz power supply ripple rejection psrr f=1khz,btl,g=-2v/v, c byp =1f 68 db channel-to-channel output separation f = 1khz 80 db signal-to-noise ratio snr p out = 500mw, btl, g=-2v/v 90 db output noise voltage v n btl, g=-2v/v, a weighted filter 45 v (rms) note output power is measured at the output terminals of the ic at 1khz.
pa3431 cmos ic unisonic technologies co., ltd 4 of 11 www.unisonic.com.tw qw-r502-185.a ? typical application circuit gnd gain0 gain1 l out + l in - pv dd r in + l out - l in + bypass gnd shutdown rout+ rin- v dd pv dd rout- gnd nc gnd 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 r speaker to system control cr in - c3 v dd 1f right line input signal cs1 1f cs2 10f c b c5 1f c2 1f cl in + c4 1f cr in + v dd cl in - c1 1f left line input signal l speaker typical application circuit using single-ended inputs utc pa3431
pa3431 cmos ic unisonic technologies co., ltd 5 of 11 www.unisonic.com.tw qw-r502-185.a ? typical application circuit(cont.) gnd gain0 gain1 l out + l in - pv dd r in + l out - l in + bypass gnd shutdown r out + r in - v dd pv dd r out - gnd nc gnd 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 right speaker to system control cr in - c3 v dd 1f cs1 1f cs2 10f c b c5 1f c2 1f cl in + c4 1f cr in + v dd cl in - c1 1f left speaker utc pa3431 typical application circui t using differential inputs right negative differential input signal left negative differential input signal right positive differential input signal left positive differential input signal
pa3431 cmos ic unisonic technologies co., ltd 6 of 11 www.unisonic.com.tw qw-r502-185.a ? application information shutdown mode operating shutdown pin input the amplifier?s output low mute(the current of this device will be reduced to 160a ) high btl others don?t care c i (input capacitor) the value of c i is important to consider as it directly affect s the bass performance of the application circuit. when c i is required to allow the amplifier to bias the input signal to the proper dc level for optimum operation, it?s value can be calculate by this equation: ci=1/(2 r i f c ) r i :input impedance f c :high-pass filter?s frequency the low leakage tantalum or ceramic capacitors are sug gested to be used as the input coupling capacitors, because of the small leakage current of the input ca-pacitors will cause the dc offset voltage at the input to the amplifier that reduces the operation headroo m, especially at the high gai n applications. it is important to let the positive side connecting to the higher dc level of the appl ication when using the polarized capacitors. gain setting (vs gain0, gain1 and r i ) gain setting is determined by gain0 and gain1. the gains lis ted in the next table are re alized by changing the taps on the input resistors inside the amplifier wh ich will cause the internal input impedance(r i ) to be dependent on the gain setting as we can see listed in the next table. a v (db) gain0 gain1 r i (k ? ) 6 0 0 90 10 0 1 70 15.6 1 0 45 21.6 1 1 30
pa3431 cmos ic unisonic technologies co., ltd 7 of 11 www.unisonic.com.tw qw-r502-185.a ? typical characteristics 20 50 0.01 total harmonic distor tion plus noise vs. frequency frequency (hz) 20k 100 200 500 1k 2k 5k 10k 0.02 0.05 0.1 0.2 0.5 1 2 5 10 v dd =5v r l =3 ? po ut =1.75w a v =21.6db a v =15.6db a v =6db a v =10db 20 50 0.01 total harmonic distortion plus noise vs. frequency frequency (hz) 20k 100 200 500 1k 2k 5k 10k 0.02 0.05 0.1 0.2 0.5 1 2 5 10 v dd =5v r l =3 ? a v =6db p out =1.5w p out =1w p out =0.5w total harmonic distortion plus noise (%) total harmonic distortion plus noise (%) total harmonic distortion plus noise (%) total harmonic distortion plus noise (%)
pa3431 cmos ic unisonic technologies co., ltd 8 of 11 www.unisonic.com.tw qw-r502-185.a ? typical characteristics(cont.) total harmonic distortion plus noise (%) total harmonic distortion plus noise (%) total harmonic distortion plus noise (%) total harmonic distortion plus noise (%) total harmonic distortion plus noise (%) total harmonic distortion plus noise (%)
pa3431 cmos ic unisonic technologies co., ltd 9 of 11 www.unisonic.com.tw qw-r502-185.a ? typical characteristics(cont.) 20 50 0.01 total harmonic distortion plus noise vs. frequency total harmonic distortion plus noise (%) frequency (hz) 20k 100 200 500 1k 2k 5k 10k 0.02 0.05 0.1 0.2 0.5 1 2 5 10 v dd =5v r l =8 ? a v =6db p out =0.5w p out =1w p out =0.25w 20 50 0.01 total harmonic distortion plus noise vs. frequency total harmonic distortion plus noise (%) frequency (hz) 20k 100 200 500 1k 2k 5k 10k 0.02 0.05 0.1 0.2 0.5 1 2 5 10 v dd =5v r l =8 ? p out =1w a v =21.6db a v =15.6db a v =6db a v =10db total harmonic distortion plus noise (%) total harmonic distortion plus noise (%) total harmonic distortion plus noise (%) total harmonic distortion plus noise (%)
pa3431 cmos ic unisonic technologies co., ltd 10 of 11 www.unisonic.com.tw qw-r502-185.a ? typical characteristics(cont.) supply ripple rejection ratio (db) supply ripple rejection ratio (db) 20 50 10u output noise vs. frequency output noise (v) frequency (hz) 20k 100 200 500 1k 2k 5k 10k 20u 30u 40u 50u 100u 200u 300u 500u 70u 60u 400 0 0 output power vs. load resistance output power (w) load resistance ( $ ) 40 10 20 30 0.5 1 1.5 2 2.5 v dd =5v thd+n=1% each channel v dd =5v r l =4 ? a v =6db a-weighted filter 0 0 power dissipation vs. output power power dissipation output power (w) 2.5 0.5 1 1.5 0.2 0.6 1 1.4 1.8 2 0.4 0.8 1.2 1.6 v dd =5v each channel r l =8 $ r l =4 $ r l =3 $
pa3431 cmos ic unisonic technologies co., ltd 11 of 11 www.unisonic.com.tw qw-r502-185.a utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.

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