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unisonic technologies co., ua1538 linear integrated circuit www.unisonic.com.tw 1 of 21 copyright ? 2011 unisonic technologies co., qw-r109-023,c 4-ch motor driver for portable cd players ? description the utc ua1538 contains a 4ch h bridge driver and dc-dc converter control circuit on one chip, and was developed for use in portable cd players. ? features * built-in 4ch h bridge driver and pwm control of load drive voltage is made possible by external components. * dc-dc converter control circuit on chip. * with reset output inversion output pin. * empty detection level can be switched between rechargeable battery and dry battery. * constant current charging; cu rrent value can be varied using external resistor. * built-in power transistor for charging. * built-in independent thermal shutdown circuit. ? ordering information ordering number package packing lead free halogen free UA1538L-QM1-Y ua1538g-qm1-y qfp-44 tray
ua1538 linear integrated circuit unisonic technologies co., ltd 2 of 21 www.unisonic.com.tw qw-r109-023,c ? pin configuration utc ua1538 rchg out1r out1f out2r out2f pow gnd out3f out3r out4f out4r brake1 amute emp hv cc psw clk start off chgv cc sel pregnd pwmfil bsen batt reset dead sw eo ei sprt ct n.c. op- v sys1 opout op+ v sys2 v ref in3 in4 mute34 in2 mute2 in1 33 32 31 30 29 28 27 26 25 24 23 34 35 36 37 38 39 40 41 42 43 44 22 21 20 19 18 17 16 15 14 12 13 234 5 6 7 8910 11 1 ? pin description pin no. pin name input/output f unction intermal equivalent circuit 1 bsen input battery voltage monitor 2 batt input battery power supply input power supply 3 reset output reset detect output 4 dead input dead time setting
ua1538 linear integrated circuit unisonic technologies co., ltd 3 of 21 www.unisonic.com.tw qw-r109-023,c ? pin description(cont.) pin no. pin name input/output f unction intermal equivalent circuit 5 sw output transistor drive for voltage multiplier 150 6k batt 5 6 eo output error amplifier output 7 ei input error amplifier input 7 v sys1 35k 21.6k 8 sprt output short circuit protection setting 9 ct output triangular-wave output v sys1 9 2k 10k 420k batt 10 n.c. 11 14 op- op+ input op amp negative input op amp positive input 12 v sys1 input control circuit power supply input control circuit power supply 13 opout output op amp output 15 v sys2 input driver pre-step power supply pre-drive power supply 16 v ref input reference voltage input
ua1538 linear integrated circuit unisonic technologies co., ltd 4 of 21 www.unisonic.com.tw qw-r109-023,c ? pin description(cont.) pin no. pin name input/output f unction intermal equivalent circuit 17 18 20 22 in3 in4 in2 in1 input ch3 control signal input ch4 control signal input ch2 control signal input ch1 control signal input 19 21 23 mute34 mute2 brake1 input ch3 and 4 mute ch2 mute ch1 brake 19 68k 68k 21 23 24 25 26 27 29 30 31 32 out4r out4f out3r out3f out2f out2r out1f out1r output ch4 negative output ch4 positive output ch3 negative output ch3 positive output ch2 positive output ch2 negative output ch1 positive output ch1 negative output 28 powgnd power block power supply ground 36 hv cc input h-bridge power supply input 33 rchg input charge current setting 34 amute output reset invert output 35 emp output empty detect output 37 psw output pwm transistor drive 37 50 batt 38 clk input external clock synchronizing input
ua1538 linear integrated circuit unisonic technologies co., ltd 5 of 21 www.unisonic.com.tw qw-r109-023,c ? pin description(cont.) pin no. pin name input/output f unction intermal equivalent circuit 39 start input voltage multiplier dc-dc converter start 40 off input voltage multiplier dc-dc converter off 41 chgv cc input charging circuit power supply input charging circuit power supply 42 sel input/output empty detect level switch 15k batt 42 200k 130k 43 pregnd pre section power supply ground pre section power supply ground 44 pwmfil input pwm phase compensation 44 2k v sys1 2k *the positive and negative ou tputs are the polarity with respect to the input
ua1538 linear integrated circuit unisonic technologies co., ltd 6 of 21 www.unisonic.com.tw qw-r109-023,c ? block diagram 33 32 31 30 29 28 27 26 25 24 23 34 35 36 37 38 + - 39 40 41 42 43 22 21 20 v / i - + v / i - + v / i - + v / i - + ++ - 44 1 23456 + - 19 18 17 16 15 14 13 12 7891011 + + - + rchg outir out1f out2r out2f powgnd out3f out3r out4f out4r brake1 brake1 mute2 amute emp hv cc btl btl btl btl tsd psw clk start off chgv cc sel pregnd pwmfil clk maximum detection power off starter over-voltage tsd bsen batt reset dead sw eo ei sprt c t n.c. op- p o w e r u n i t p o w e r s u p p l y + - triangle wave pre-driver power supply c o n t r o l c i r c u i t p o w e r s u p p l y mute34 v sys1 op out op+ v sys2 v ref in3 in4 mute34 in2 mute2 in1 - -
ua1538 linear integrated circuit unisonic technologies co., ltd 7 of 21 www.unisonic.com.tw qw-r109-023,c ? absolute maximum ratings (t a =25 ) parameter symbol ratings unit supply voltage (note 2) v cc 13.5 v driver output current i o 500 ma power dissipation p d 625 mw operating temperature t opr -20 ~ +85 storage temperature t stg -40 ~ +150 notes: 1. 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. 2. v cc shows input voltage of v sys1 ,v sys2 , hv cc , batt and chgv cc . ? recommended operating conditions parameter symbol min typ max unit control circuit power supply voltage v sys1 2.7 3.2 5.5 v pre-driver circuit power supply voltage v sys2 2.7 3.2 5.5 v h-bridge power supply voltage hv cc pwm batt v power supply voltage batt 1.5 2.4 8.0 v charging circuit power supply voltage chgv cc 3.0 4.5 8.0 v operating temperature t a -10 25 70 ? electrical characteristics (t a =25 , batt=2.4v, v sys1 =v sys2 =3.2v, v ref =1.6v, chgv cc =0v, f clk =88.2khz, unless otherwise specified.) parameter symbol test conditions min typ max unit common section batt stand-by current i st batt=9.0v, v sys1 =v sys2 =v ref =0v 0 3 a batt supply current (no load) i bat hv cc =0.45v, mute34=3.2v 2.5 4.0 ma v sys1 supply current (no load) i sys1 hv cc =0.45v, mute34=3.2v, ei=0v 4.5 ma v sys2 supply current (no load) i sys2 hv cc =0.45v, mute34=3.2v 4.1 5.5 ma chgv cc supply current (no load) i cgvcc chgv cc =4.5v, r out =open 0.65 2.00 ma h-bridge driver part voltage gain ch1,ch3.ch4 g vc134 12 14 16 db voltage gain ch2 g vc2 21.5 23.5 24.5 db gain error by polarity g S vc -2 0 2 db input pin resistance ch1,ch3,ch4 r in134 in=1.7v and 1.8v 9 11 13 k ? input pin resistance ch2 r in2 in=1.7v and 1.8v 6 7.5 9 k ? maximum output voltage v out r l =8 ? ,hv cc =batt=4.0v in=0-3.2v 1.9 2.1 v saturation voltage (lower) v satl i o =-300ma, in=0 and 3.2v 240 400 mv saturation voltage (upper) v satu i o =-300ma, in=0 and 3.2v 240 400 mv input offset voltage v oi -8 0 8 mv output offset voltage ch1,ch3,ch4 v oo134 v ref =in=1.6v -50 0 50 mv output offset voltage ch2 v oo2 v ref =in=1.6v -130 0 130 mv dead zone v db -10 0 10 mv brake1on threshold voltage v bron in1=1.8v 2.0 v brake1off threshold voltage v broff in1=1.8v 0.8 v mute2 on threshold voltage v m2on in2=1.8v 2.0 v
ua1538 linear integrated circuit unisonic technologies co., ltd 8 of 21 www.unisonic.com.tw qw-r109-023,c ? electrical characteristics(cont.) parameter symbol test conditions min typ max unit h-bridge driver part mute2 off threshold voltage v m2off in2=1.8v 0.8 v mute34 on threshold voltage v m34on in3=in4=1.8v 0.8 v mute34 off threshold voltage v m34off in3=in4=1.8v 2.0 v v ref on threshold voltage v refon in1=in2=in3=in4=1.8v 1.2 v v ref off threshold voltage v refoff in1=in2=in3=in4=1.8v 0.8 v brake1 brake current i brake1 current difference between brake pin "h" time and "l" time. 4 7 10 ma pwm power supply driving psw sink current i psw in1=2.1v 10 13 17 ma hv cc level shift voltage v shif in1=1.8v, hv cc -out1f 0.35 0.45 0.55 v hv cc leak current i hlk hvcc=9.0v, v sys1 =v sys2 =batt=0v 0 5 a pwm amp transfer gain g pwm in1=1.8v, hv cc =1.2 ~ 1.4v 1/60 1/50 1/40 1/k ? dc-dc converter error amp v sys1 threshold voltage v s1th 3.05 3.20 3.35 v eo pin output voltage "h" v eoh ei=0.7v, io=-100a 1.4 1.6 v eo pin output voltage "l" v eol ei=1.3v, io=100a 0.3 v short circuit protection sprt pin voltage v spr ei=1.3v 0 0.1 v eo=h sprt pin current1 i spr1 ei=0.7v 6 10 16 a off=l sprt pin current2 i spr2 ei=1.3v, off=0v 12 20 32 a sprt pin current3 over-voltage i spr3 ei=1.3v, batt=9.5v 12 20 32 a sprt pin impedance r spr 175 220 265 k ? sprt pin threshold voltage v spth ei=0.7v, c t =0v 1.10 1.20 1.30 v over-voltage protection detect v hvpr bsen pin voltage 7.5 9.0 v transistor driving sw pin output voltage1 "h" v sw1h batt=c t =1.5v, v sys1 =v sys2 =0v, i o =-2ma starting time 0.78 0.98 1.13 v sw pin output voltage2 "h" v sw2h c t =0v, io=-10ma,ei=0.7v, sprt=0v 1.00 1.50 v sw pin output voltage2 "l" v sw2l c t =2.0v, io=10ma 0.30 0.45 v sw pin oscillating frequency1 f sw1 c t =470pf, v sys1 =v sys2 =0v starting time 65 80 95 khz sw pin oscillating frequency2 f sw2 c t =470pf, clk=0v 60 70 82 khz sw pin oscillating frequency3 f sw3 c t =470pf 88.2 khz sw pin minimum pulse width t swmin c t =470pf, eo=0.5v 0.7v sweep 0.01 0.60 s pulse duty start d sw1 c t =470pf,v sys1 =v sys2 =0v 40 50 60 % max. pulse duty at self-running d sw2 c t =470pf, ei=0.7v, clk=0v 70 80 90 % max. pulse duty at clk synchronization d sw3 c t =470pf, ei=0.7v 65 75 85 %
ua1538 linear integrated circuit unisonic technologies co., ltd 9 of 21 www.unisonic.com.tw qw-r109-023,c ? electrical characteristics(cont.) parameter symbol test conditions min typ max unit interface off pin threshold voltage v ofth ei=1.3v v sys1 - 2.0 v off pin bias current i off off=0v 75 95 115 a start pin on threshold voltage v stath1 v sys1 =v sys2 =0v, c t =2.0v batt- 1.0 v start pin off threshold voltage v stath2 v sys1 =v sys2 =0v, c t =2.0v batt- 0.3 v start pin bias current i start start=0v 10 13 20 16 30 19 a clk pin threshold voltage "h" v clkthh 2.0 v clk pin threshold voltage "l" v clkthl 0.8 v clk pin bias current i clk clk=3.2v 10 a dead time dead pin impedance r dead 52 65 78 k ? dead pin output voltage v dead 0.78 0.88 0.98 v starter circuit starter switching voltage v stnm v sys1 =v sys2 =0 3.2v, start=0v 2.3 2.5 2.7 v starter switching hysteresis width v snhs start=0v 130 200 300 mv discharge release v dis 1.63 1.83 2.03 v empty detection emp detection voltage 1 v empt1 v sel =0v 2.1 2.2 2.3 v emp detection voltage 2 v empt2 i sel =- 2a 1.7 1.8 1.9 v emp detection hysteresis voltage 1 v emhs1 v sel =0v 25 50 100 mv emp detection hysteresis voltage 2 v emhs2 i sel =- 2a 25 50 100 mv emp pin output voltage v emp i o =1ma, bsen=1v 0.5 v emp pin output leak current i empl bsen=2.4v 1.0 a bsen pin input resistance r bsen v sel =0v 17 23 27 k ? bsen pin leak current i bsenl v sys1 =v sys 2=0v, bsen=4.5v 1.0 v sel pin detection voltage v selth v selth =batt-sel bsen=2.0v 1.5 v sel pin detection current i selt -2 a reset circuit v sys1 reset threshold voltage ratio h srt comparison with error amplifier threshold voltage 85 90 95 % reset detection hysteresis width v rsths 25 50 100 mv reset pin output voltage v rst io=1ma, v sys1 =v sys2 =2.8v 0.5 v reset pin pull up resistance r rst 72 90 108 k ? amute pin output voltage 1 v amt1 io=-1ma, v sys1 =v sys2 =2.8v batt -0.4 batt v amute pin output voltage 2 v amt2 io=-1ma,start=0v, v sys1 =v sys2 =0v batt -0.4 batt v amute pin pull down resistance r amt 77 95 113 k ?
ua1538 linear integrated circuit unisonic technologies co., ltd 10 of 21 www.unisonic.com.tw qw-r109-023,c ? electrical characteristics(cont.) parameter symbol test conditions min typ max unit op amp input bias current i bias op+=1.6v 300 na input offset voltage v oiop -5.5 0 5.5 mv high level output voltage v ohop r l =open 2.8 v low level output voltage v olop r l =open 0.2 v output drive current (source) i sou 50 ? gnd -6.5 -3.0 ma output drive current (sink) i sin 50 ? v sys1 0.4 0.7 ma open loop voltage gain g vo v in =-75dbv, f=1khz 70 db slew rate s r 0.5 v/ s battery charging circuit rchg pin bias voltage v rchg chgv cc =4.5v, rchg=1.8k ? . 0.71 0.81 0.91 v rchg pin output resistance r rchg chgv cc =4.5v, rchg=0.5 and 0.6v 0.75 0.95 1.20 k ? sel pin leak current 1 i sellk1 chgv cc =4.5v, rchg=open, batt=4.5v 1.0 a sel pin leak current 2 i sellk2 chgv cc =0.6v, rchg=1.8k ? , batt=4.5v 1.0 a sel pin saturation voltage v selcg chgv cc =4.5v, i o =300ma, rchg=0 ? 0.45 1.00 v
ua1538 linear integrated circuit unisonic technologies co., ltd 11 of 21 www.unisonic.com.tw qw-r109-023,c ? measuring circuit utc ua1538 rchg outir out1f out2r out2f p o w g n d out3f out3r out4f out4r brake1 amute emp hvcc psw clk start off chgvcc sel pregnd pwmfil bsen batt reset dead sw eo ei sprt ct n.c op- v sys1 opout op+ v sys2 v ref in3 in4 mute34 in2 mute2 in1 33 32 31 30 29 28 27 26 25 24 23 34 35 36 37 38 39 40 41 42 43 44 22 21 20 19 18 17 16 15 14 12 13 234 5 6 7 8 9 10 11 1 v v v rf sw17 sw18 aa b b v a v a v a v a a v a v v v v a v v v a v a v a v a v a a a a a v a a a v v v a a v sw16 a b sw15 a b sw14 a b sw13 a b 1k + 10 sw12 sw11 a b 50 20k 100k 470 + sw10 d a b sw8 10k b sw9 a 470p b a sw7 a b f r e q u e n c y sw6 b a a sw5 sw4 a b 10k sw3 a b a a sw1 sw2 a b 10p 2200p 100k ab sw28 sw27 a b a b sw26 sw25 a a sw24 sw23 sw22 sw21 a b b a c a b 51k 33 47 + a b 100 + sw20 a b sw19 1.8k 47 1m c a b
ua1538 linear integrated circuit unisonic technologies co., ltd 12 of 21 www.unisonic.com.tw qw-r109-023,c ? switching position table item sw no. 1 4 5 6 7 8 22 24 25 26 batt stand-by current - - - - - - - - - - batt supply current (no load) - - - - - - a - a - v sys1 supply current (no load) - - - a - - a - a - v sys2 supply current (no load) - - - - - - a - a - chgv cc supply current (no load) - - - - - - - - - - v sys1 threshold voltage - - a - - - - - - - eo pin output voltage ?h? - - a a - - - - - - eo pin output voltage ?l? - - a a - - - - - - sprt pin voltage - - - a a - - - - - sprt pin current1 eo=?h? - - - a b - - - - - sprt pin current2 off=?l? - - - a b - - - - a sprt pin current3 over-voltage a - - a b - - - - - sprt pin impedance - - - - b - - - - - sprt pin threshold voltage - - - a a a - - - - over-voltage protection detect a - - - a - - - - - sw pin output voltage1 ?h? - a - - - a - - a - sw pin output voltage2 ?h? - a - a b a - - - - sw pin output voltage2 ?l? - a - - - a - - - - sw pin oscillating frequency 1 - b - - - b - - a - sw pin oscillating frequency 2 - b - - - b - b - - sw pin oscillating frequency 3 - b - - - b - a - - sw pin minimum pulse width - b b - - b - - - - pulse duty start - b - - - b - b a - max pulse duty at self-ru nning - b - - - b - b - - max pulse duty at clk synchronization - b - a - b - a - - -: turn off switch item sw no. 2 3 4 6 7 8 20 24 25 26 dead pin impedance - b - - - - - - - - dead pin output voltage - a - - - - - - - - off pin threshold voltage - - - a a - - - - a off pin bias current - - - - - - - - - a start pin on threshold voltage - - a - - a - - a - start pin off threshold voltage - - a - - a - - a - start pin bias current - - - - - - - - a - clk pin threshold voltage ?h? - - a - - b - b - - clk pin threshold voltage ?l? - - a - - b - b - - clk pin bias current - - - - - - - a - - starter switching voltage - - a - - - - - a - starter switching hysteresis width - - a - - - - - a - discharge release voltage - - - - a - - - - - v sys1 pin reset threshold voltage ratio b - - - - - - - - - reset detection hysteresis width b - - - - - - - - - reset pin output voltage b - - - - - - - - - reset pin pull up resistance a - - - - - - - - - amute pin output voltage 1 - - - - - - b - -- - amute pin output voltage 2 - - - - - - b - a - amute pin pull down resistance - - - - - - a - - - -: turn off switch
ua1538 linear integrated circuit unisonic technologies co., ltd 13 of 21 www.unisonic.com.tw qw-r109-023,c ? switching position table(cont.) item sw no. 1 9 10 11 12 21 27 emp detection voltage 1 a - - - - a a emp detection voltage 2 a - - - - a b emp detection hysteresis voltage 1 a a - - - a a emp detection hysteresis voltage 2 a - - - - a b emp pin output voltage a - - - - b - emp pin output leak current a - - - - c - bsen pin input resistance a - - - - - a bsen pin leak current a - - - - - - sel pin detection voltage a - - - - a a sel pin detection current a - - - - a b input bias current - - a - - - - input offset voltage - - d - - - - ?h? level output voltage - b c - - - - ?l? level output voltage - a c - - - - output drive current (source) - - d b - - - output drive current (sink) - - d a - - - open loop voltage gain - - b - a - - slew rate - - d - a - - -: turn off switch item sw no. 13 14 15 16 17 18 22 voltage gain ch1r - - - b b b a ch2r - - b - b b a ch3r b - - - b b a ch4r - b - - b b a gain error by polarity ch1 - - - b b b a ch2 - - b - b b a ch3 b - - - b b a ch4 - b - - b b a input pin resistance ch1 - - - b b b a ch2 - - b - b b a ch3 b - - - b b a ch4 - b - - b b a maximum output voltage ch1r - - - b b b a ch2r - - b - b b a ch3r b - - - b b a ch4r - b - - b b a saturation voltage (lower) ch1f - - - b a - a ch1r - - - b - a a ch2f - - b - a - a ch2r - - b - - a a ch3f b - - - a - a ch3r b - - - - - a ch4f - b - - a - a ch4r - b - - - a a
ua1538 linear integrated circuit unisonic technologies co., ltd 14 of 21 www.unisonic.com.tw qw-r109-023,c ? switching position table(cont.) item sw no. 13 14 15 16 17 18 22 saturation voltage (upper) ch1f - - - b a - a ch1r - - - b - a a ch2f - - b - a - a ch2r - - b - - a a ch3f b - - - a - a ch3r b - - - - a a ch4f - b - - a - a ch4r - b - - - a a input offset voltage ch1 - - - a - - a ch2 - - a - - - a ch3 a - - - - - a ch4 - a - - - - a output offset voltage ch1 - - - b b b a ch2 - - b - b b a ch3 b - - - b b a ch4 - b - - b b a dead zone ch1 - - - b b b a ch2 - - b - b b a ch3 b - - - b b a ch4 - b - - b b a -: turn off switch item sw no. 13 14 15 16 17 18 22 23 28 brake1 on voltage ch1 - - - b b b a - - brake1 off voltage ch1 - - - b b b a - - mute2 on voltage ch2 - - b - b b a - - mute2 off voltage ch2 - - b - b b a - - mute34 on voltage ch3 b - - - b b a - - ch4 - b - - b b a - - mute34 off voltage ch3 b - - - b b a - - ch4 - b - - b b a - - v ref on voltage ch1 - - - b b b a - - ch2 - - b - b b a - - ch3 b - - - b b a - - ch4 - b - - b b a - - v ref off voltage ch1 - - - b b b a - - ch2 - - b - b b a - - ch3 b - - - b b a - - ch4 - b - - b b a - - break1 brake current ch1 - - - b b b a - - pwm sink current - - - b - - a b a hv cc level shift voltage - - - b b b b a b hv cc leak current - - - - b b a - - pwm amp transfer gain - - - b b b a - -
ua1538 linear integrated circuit unisonic technologies co., ltd 15 of 21 www.unisonic.com.tw qw-r109-023,c ? switching position table(cont.) item sw no. 19 27 chgset pin bias voltage a - chgset pin output resistance b - sel pin leak current 1 - a sel pin leak current 2 a a sel pin saturation voltage b b -: turn off switch ? switching position table v in 1 v in 2 vo3 vo4 v in 3 v in 4 dead zone output offset voltage vo2 vo1 output voltage:vo (mv) xc' xc
ua1538 linear integrated circuit unisonic technologies co., ltd 16 of 21 www.unisonic.com.tw qw-r109-023,c ? application circuit 33 32 31 30 29 28 27 26 25 24 23 34 35 36 37 38 + - 39 40 41 42 43 22 21 20 v / i - + v / i - + v / i - + v / i - + ++ - 44 1 23456 + - 19 18 17 16 15 14 13 12 7891011 + - + rchg outir out1f out2r out2f powgnd out3f out3r out4f out4r brake1 brake1 mute2 amute emp hv cc btl btl btl btl tsd psw clk start off chgv cc sel pregnd pwmfil clk maximum detection power off starter over-voltage tsd bsen batt reset dead sw eo ei sprt c t n.c. op- + - triangle wave pre-driver power supply c o n t r o l c i r c u i t p o w e r s u p p l y mute34 v sys1 op out op+ v sys2 v ref in3 in4 mute34 in2 mute2 in1 m 1.8k traverse spindle focus tracking filter 470p 0.1 0.022 8.2k 100 v out dc-dc converter application 0.1 v in 47 + 10p 100k 2200p 100k 0.1 47 0.1 33 47 + * we shall not be liable for any trouble or damege caused by using this circuit. *in the evert a problem which may affe ct industrial property or any other rights of us or a third party is encountered during the use of information described in these circuit,mitsumi elec tric co.,ltd.shall not be liable for any such problem,nor grant a license therefor. m + + - -
ua1538 linear integrated circuit unisonic technologies co., ltd 17 of 21 www.unisonic.com.tw qw-r109-023,c ? circuit operation 1 h-bridge driver block (1) gain setting the driver input resistance (ch 1,3 and 4) are 11k ? typ. ,ch2 is 7.5k ? typ. . set the gain according to the following formula. ch1 ch2 ch3 ch2 gv=20 log gv=20 log 55k 11k+r 110k 7.5k+r (db) (db) r:externally-connected input the driver output stage power supply is hv cc (36pin), and the bridge circuit power supply is v sys2 (15 pin). connect a bypass capacitor between these two power supplies (approximately 0.1 f). (2) mute function of the four drivers,ch1 has a brake function, and the other c hannels have a mute function. when brake1(23pin)is set to high level, both ch1 out puts go low level, and the circuit enters brake mode. when mute2(21pin)is set to high level, the ch2 output is muted. when mute34(19pin)is set to high level, the ch3 and 4 outputs are muted. (3) v ref drop mute when the voltage applied to v ref (16pin)is 1.0v or less typ. , the driv er outputs are set to high impedance. (4) thermal shutdown when the chip temperature reaches 150 typ. the output current is cut. the chip starts operating again at about 120 typ. . 2 pwm power supply drive block this detects the maximun output level from among t he four channels, and supplies the load drive power supply (36pin)for the pwm. the external component s are a pnp transistor, coil, schottky diode, and capacitor. 3 dc-dc converter block (1) output voltage 3.2v typ. voltage multiplier circuit can be construc ted using external components. this voltage can be varied with the addition of an external resistor. the setting method is as follows.
ua1538 linear integrated circuit unisonic technologies co., ltd 18 of 21 www.unisonic.com.tw qw-r109-023,c ? circuit operation(cont.) (2) short protect function when the error amplifier output(6pin)ha s switched to the high-level state, sprt (8pin)is charged, and when the voltage reaches 1.2v typ. , the sw(5pin)switching stops. the time until switching stops is set by the capacitor connected to sprt(8pin)according to the following formula. (3) soft start function the soft start function operates when a capacit or is connected between dead(4pin)and gnd. also, the maximum duty can be varied by connecting a resistor to 4pin. (4) power off function when low-level is applied to off(40pin), sprt(8pin)i s charged, and when the voltage reaches 1.2v typ. , the sw(5pin)switching stops. the ti me until switching stops is set by the capacitor connected to sprt (8pin)according to the following formula. (5) over voltage protection circuit when the voltage applied to bsen(1pin)reaches 8.4v ty p. , sprt (8pin) is charged, and when the voltage reaches 1.2v typ. , thesw (5pin)sw itching stops. the time until switchin g stops is set by the capacitor connected to sprt(8pin)according to the following formula. 4 empty detector block (1) output voltage when the voltage applied to the bsen (1pin)falls below the detector voltage, emp(35pin)goes from high level to low level(open-collector output). the detector voltage has 50mv typ. of hysteresis to prevent output chattering. use sel (42pin) to swit ch the detection voltage as shown below. sel detect voltage return voltage l 2.20v typ. 2.25v typ. high-z 1.80v typ. 1.85v typ. 5 reset circuit block at about 90% typ. of the dc-dc conv erter output voltage, reset(3pin)goes from low level to high level, and amute(34pin)goes from high level to low level. t he reset voltage has 50mv typ. of hysteresis to prevent output chattering.
ua1538 linear integrated circuit unisonic technologies co., ltd 19 of 21 www.unisonic.com.tw qw-r109-023,c ? circuit operation(cont.) 6 charging circuit block the power supply for the charging circuit block is chgv cc (41pin), and is independent from the other circuits. the resistance between rchg (33pin) and gnd se ts the charging current. this current is drawn from sel (42pin). a thermal shutdown circuit is provided, and when the chip temperature reaches 150 typ. the charging current is cut. the chip star ts operating again at about 120 typ. .
ua1538 linear integrated circuit unisonic technologies co., ltd 20 of 21 www.unisonic.com.tw qw-r109-023,c ? typical characteristic input load fluctuation output voltage:vo (v) input load fluctuation (ch2) output voltage:vo (v) dead zone input voltage: v in (mv) error amp output voltage dead output voltage e:v daed (v) eo output voltage:v eo (v)
ua1538 linear integrated circuit unisonic technologies co., ltd 21 of 21 www.unisonic.com.tw qw-r109-023,c ? typical characteristic resete pin voltage reset output voltage:v rst (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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