unisonic technologies co., ltd pa4871 cmos ic www.unisonic.com.tw 1 of 6 copyright ? 2009 unisonic technologies co., ltd qw-r502-232.e 1.1w audio power amplifier with shutdown mode ? description as a mono bridged power amplifier which is operating on a single 5v supply, the utc pa4871 is capable of deliv ering 1.1w of output power per channel into 8 ? loads with less than 0.5% thd+n. the utc pa4871 is optimally suited for low-power portable applications because of the it do not require output coupling capacitors, bootstrap capacit ors or snubber networks. by using external gain-setting resistors, the closed loop response of the unity-gain stable pa4871 can be configured. ? features * output power at 0.5% thd+n supply voltage:5v delivering 1.1w into a 8 ? load * with shutdown mode * stable unity-gain. * halogen free sop-8 dfn-8(3x3) 1 msop-8 ? ordering information ordering number package packing PA4871G-30Q-8-R dfn-8 tape reel pa4871g-s08-r sop-8 tape reel pa4871g-sm1-r msop-8 tape reel
pa4871 cmos ic unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r502-232.e ? pin configuration v out 2 8 7 6 5 1 2 3 4 -in shutdown bypass +in gnd v dd v out 1 dfn-8(33) sop-8 / msop-8 ? pin description pin no pin name description 1 shutdown shutdown control input pin. 2 bypass connected to a bypass capacitor. 3 +in + pin of input signal. 4 -in - pin of input signal. 5 v out1 output pin1 6 v dd supply voltage 7 gnd gnd 8 v out2 output pin2
pa4871 cmos ic unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r502-232.e ? block diagram
pa4871 cmos ic unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r502-232.e ? absolute maximum rating parameter symbol ratings unit supply voltage v dd 6 v input voltage v in -0.3~v dd +0.3 v power dissipation p d internally limited w junction temperature t j 150 operating temperature t opr -40~+85 storage temperature t stg -65~+150 note: absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. ? thermal data parameter symbol ratings unit dfn-8(33) 59 /w junction to ambient sop-8/msop-8 ja 140 /w dfn-8(33) (note) 4.3 /w junction to case sop-8/msop-8 jc 35 /w note: surface mounted on 1 in 2 copper pad of fr4 board ? electrical characteristics (ta=25 , v dd =5v, r l =8 ? , unless otherwise specified) parameter symbol test conditions min typ max unit dc electrical characteristics supply voltage v dd 2.0 5 5.5 v dc differential output voltage v out(diff) v in =0v 5 50 mv mute mode v in =0v,i out =0a 6.5 10.0 ma supply current shutdown mode i dd v pin1 =v dd 0.6 2 a thd=0.5%, f in =1khz 1.0 1.10 w output power p out thd=10%, f in =1khz 1.5 w total harmonic distortion+noise thd+n p out =1w rms , 20hz < f in < 20khz, g=2v/v 0.25 % power supply ripple rejection psrr v dd =4.9v to 5.1v 65 db
pa4871 cmos ic unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r502-232.e ? typical application circuit
pa4871 cmos ic unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r502-232.e ? typical characteristics 0 output waveform (v) time (s) 1600 400 800 1200 0 2 4 output waveform 6 8 -2 -4 -6 -8 2000 v dd =5v, r l =8 f=1khz, thd=0.5% v p-p =8.42 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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