unisonic technologies co., ltd ta8207k linear integrated circuit www.unisonic.com.tw 1 of 9 copyright ? 2012 unisonic technologies co., ltd qw-r107-013.d low frequency power amplifier ? description the utc ta8207k is an audio power ic with built-in two channels and thermal shut down protection circuit. the ic is developed for portable radio cassette tape recorder with power on/off switch. ? features *high power : p out =2.5w / ch (typ.) (v cc =9v, r l =4 , f=1khz, thd=10%) : p out =4.6w / ch (typ.) (v cc =12v, r l =4 , f=1khz, thd=10%) *low popping noise at power on *small quiescent curren t: iccq=21ma (typ.) (v cc =9v, v in =0) *soft clip *built-in thermal shut down protection circuit *bast for supply voltage 9v, 12v *operation supply voltage range: v cc =6-15v ? ordering information order number package packing lead free halogen free ta8207kl-f12-h-t ta8207kl-f12-h-t fsip-12h tube
ta8207k linear integrated circuit unisonic technologies co., ltd 2 of 9 www.unisonic.com.tw qw-r107-013.d ? absolute maximum ratings (t a =25 , unless otherwise specified) parameter symbol value unit supply voltage v cc 20 v output current (peak / ch) i o ( peak ) 2.5 a power dissipation p d 12.5 w operating temperature t opr -20 to + 75 storage temperature t stg -55 to + 150 ? electrical characteristics (v cc =9v, r l =4 ? , r g =600 ? , f=1khz, t a =25 , unless otherwise specified) parameter symbol test conditions min typ max unit quiescent current i ccq v in =0 21 45 ma output power p out ( 1 ) thd=10% 2.0 2.5 w p out ( 2 ) v cc =12v,thd=10% 4.6 w total harmonic distortion thd p out =0.4w / ch 0.2 1.0 % output noise voltage e n r g =10k ? bw=20hz ~ 20khz 0.3 1.0 mv rms input resistance r in 30 k ? voltage gain g v (1) r f =120 ? v out =0.775v rms 43 45 47 db g v (2) r f =0, v out =0.775v rms 56.5 db ripple rejection ratio rr r g =600 ? fripple=100hz 52 db cross talk ct r g =600 ? , amp1<->2 v out =0dbm, f=1khz 50 db input offset voltage v6,v7 30 60 mv stand-by current i stdby sw1->off 1 a ? typical dc voltage of each terminal (v cc =9v, t a =25 ) terminal no. 1 2 3 4 5 6 7 8 9 10 11 12 dc voltage 8.7 4.5 v cc 5.0 0.7 0.03 0.03 0.7 gnd 4.5 8.7 v cc
ta8207k linear integrated circuit unisonic technologies co., ltd 3 of 9 www.unisonic.com.tw qw-r107-013.d ? test circuit 12 3 6 5 4 7 8 10 11 9 45 1 2 45 r11 120 30k + - ch - 2 ch - 1 + - bias circuit the rmal shut down protection circuit in2 nf2 30k gnd + - + - + - + - + - + - + - + - + - r12 120 + - + - in1 nf1 ripple v cc2 b.s.1 *1 *1 *2 c1 100 f sw1 c11 100 f c in c3 47 f c in c2 47 f c5 100 f c7 0.15 f c9 1000 f r l out - 2 r l c6 0.15 f out - 1 c8 1000 f c4 100 f b.s.2 c10 1000 f v cc1 in - 1 in - 2 remark: 1.this ic can be used without coupling capacitor (c in ). if volume slide noise occurred by input offset voltage is undesirable, it needs to use the capacitor (c in ). 2.the condenser between the pin3 and the gnd (c11) is for reducing pop noise when the power on/off switch (sw1) is set to on/off.
ta8207k linear integrated circuit unisonic technologies co., ltd 4 of 9 www.unisonic.com.tw qw-r107-013.d ? application information 1. adjustment of voltage gain the voltage gain g v is obtained as follows by r1, r2 and r f in fig.1. input 6/7 5/8 c nf - + 47 f r f r1 45 ? r2 30k ? 2/10 output + amp - r f +r1+r2 g v =20 og r f +r1 when r f =0 ? g v =56.5db(typ.) when r f =120 ? g v =45db(typ.) reduction of g v is possible by increasing r f . however, it is recommended to use this at 40db or over since the feedback increase is liable to produce oscillation. 2. thermal shutdown circuit the built-in thermal shut-down circuit can prevent the de struction of ic that abnorma l temperature rise when the heat radiation is insufficient. the operation tem perature is set at radi ation fin temperature 175 , at this temperature or over the bias is interrupted to prevent the destruction of ic. 3. input stage below circuit shows the input circuit of this ic. output input 6/7 9 gnd - + c in q1 q2 q3 to driver to bias 2/10 5/8 30k ? nf it is possible that without input coupling capacitor in the input circuit by use a pnp transistor, q1. however, 60mv max offset voltage is produced at pin (6 ) and (7). application after checking volume slide noise is recommended. in order to cut the volume slide noise, insert the input capacitor (c in) in series to inte rrupt the dc component.
ta8207k linear integrated circuit unisonic technologies co., ltd 5 of 9 www.unisonic.com.tw qw-r107-013.d ? application information(cont.) 4. oscillation preventive measures for oscillation preventive capacitor c6 and c7 between th e output terminal and gnd, pol yester film capacitor is recommended due to good characteristics for temperatur e and for high frequency. it is better that use this capacitor after the temperature test to check the oscillation allowance due to t he characteristics of the capacitor is liable to be influenced by the temperature. besides, as t he position of the el ectrolytic capacitor has remarkable influence on the oscillation, connect c10 to v cc as close power gnd as possible. at using this application with the volt age gain reduced, oscillation is liable to be produced. apply the capacitor after checking enough for its capacity, type and mounting position. 5. power on/off switch there is power on/off switch at (3) pi n. however, output power is changed by (3) pin supply voltage when(3) pin supply voltage i not same(12) pin supply voltage, after refe rring to attached date, select(3) pin supply voltage. 6. input voltage when the excessive signal is input, turning-up is produced in the clip waveform. the turning-up point is v in =300mv rms (typ.): v cc =9v, r l =4 ? , f=1khz: enough care must be taken for this phenomenon. 7. gnd line gnd pin is not separated for pre-gnd and for p w -gnd. that is liable to cause distortion and cross talk worse.
ta8207k linear integrated circuit unisonic technologies co., ltd 6 of 9 www.unisonic.com.tw qw-r107-013.d typical characteristics r l =4 ? v in =0 t a =25 supply voltage, vcc (v) i ccq ,v2,v10-v cc 80 quiescent current, i ccq (ma) 0 20 40 60 4 0 812 16 20 2 4 6 8 12 10 gv-f 80 70 60 50 40 30 20 10 0 30 100 1k 10k 100k frequency, f (hz) voltage gain, g v (db) 3k 30k v cc =9v r l =4 ? r nf =120 ? t a =25 v cc =9v r l =4 ? r nf =120 ? t a =25 thd - p out f=10khz 100hz 1khz output power, p out (w) 0.1 0.03 0.01 0.3 10 13 30 10 0.5 1 3 5 0.3 0.1 t o t a l h a r m o i c d i s t o r t i o n , t h d ( % ) 0.1 0.03 0.01 30 10 0.5 0.3 thd - p out v cc =12v r l =4 ? r nf =120 ? t a =25 f=10khz 100hz 1khz 1 3 5 0.3 0.1 10 13 t o t a l h a r m o i c d i s t o r t i o n , t h d ( % ) output power, p out (w)
ta8207k linear integrated circuit unisonic technologies co., ltd 7 of 9 www.unisonic.com.tw qw-r107-013.d ? typical characteristics (cont.) 4 12 supply voltage, v cc2 (v) i ccq2 ,v2,v10-v cc2 0 6 8 10 0 2 4 8 10 12 14 6 8 12 10 4 2 2 i ccq2 v2,v10 0 0.1 0.03 0.01 30 10 0.5 0.3 thd - p out v cc1 =9v r l =4 ? f=1khz r nf =120 ? t a =25 1 3 5 0.3 0.1 10 13 output power, p out (w) 7 9 v cc2 =5v 6 8
ta8207k linear integrated circuit unisonic technologies co., ltd 8 of 9 www.unisonic.com.tw qw-r107-013.d ? typical characteristics (cont.) 40 12 ambient temperature, t a ( ) allowable power dissipation, p d (w) p d -t a 0 6 8 10 0 160 180 60 80 100 120 4 2 20 140 14 (1) (2) (3) (4) (1) infnite heat sink (2) 80cm 2 2mm al heat sink (3) 18cm 2 2mm al heat sink (4) no heat sink 2 5 output voltage, p out (w) power dissipation, p d (w) p d -p out 0 2 3 4 0 3 4 5 6 1 1 7 r l =4 ? f=1khz v cc =12v 9 0 0.5 ambient temperature, t a ( ) total harmonic distortion, thd (%) thd - t a 0 0.2 0.3 0.4 -40 20 40 60 80 0.1 -20 100 v cc =9v r l =4 ? p out =0.4w f=1khz 0 50 ambient temperature, t a ( ) quiescent current, i ccq (ma) i ccq ,v2,v10 - t a 0 20 30 40 -40 20 40 60 80 10 -20 v cc =9v r l =4 ? v in =0 10 8 6 4 2 0 v2,v10 i ccq output voltage v2,v10 (v) quiescent current, i ccq2 (ma) output voltage, v2,v10 (v) t o t a l h a r m o i c d i s t o r t i o n , t h d ( % )
ta8207k linear integrated circuit unisonic technologies co., ltd 9 of 9 www.unisonic.com.tw qw-r107-013.d ? typical characteristics (cont.) allowable power dissipation, p d (w) power dissipation, p d (w) total harmonic distortion, thd (%) quiescent current, i ccq (ma) output voltage, v2,v10 (v) 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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