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1 e99145-te sony reserves the right to change products and specifications without prior notice. this information does not convey any licens e by any implication or otherwise under any patents or other right. application circuits shown, if any, are typical examples illustr ating the operation of the devices. sony cannot assume responsibility for any problems arising out of the use of these circuits. description CXA2534Q is a 4-channel h-bridge motor driver ic designed for portable cd systems. it has a built-in dc to dc converter controller that allows voltage step-up to typically 3.2 v; this voltage can be used to power the system dsp, ssp and micro-controller. in addition, it also provides a pwm regulated power supply to the h-bridge output stage so as to ensure high efficiency. features ? 4 channels of h-bridge drivers ? pwm regulated power supply for h-bridge output stages ? step-up dc to dc converter controller for system power supply ? start and off controls with soft start capability ? reset pulse ? short circuit protect ? over-voltage protect ? low battery voltage detection ? rechargeable battery charger ? general purpose operational amplifier ? thermal shut-down for battery charger and h- bridge driver (170 c/140 c) ? direct interface with wired remote controller possible applications portable cd player structure bipolar silicon monolithic ic 4-channel cd motor driver 48 pin qfp (plastic) CXA2534Q
2 CXA2534Q absolute maximum ratings (ta=25 c) item supply voltage spindle channel output current sled channel output current focus channel output current track channel output current allowable power dissipation operating temperature storage temperature symbol v cc 1, v cc 2, pv cc io (spindle) io (sled) io (focus) io (track) p d topr tstg rating 13.5 400 300 200 200 660 C20 to +75 C65 to +150 unit v ma ma ma ma mw c c recommended operating conditions (ta=25 c) item system 1 supply voltage system 2 supply voltage power v cc battery supply voltage battery charger supply voltage operating temperature symbol v cc 1 v cc 2 pv cc batt chgv cc ta min 2.7 2.7 1.5 3 C10 typ 3.2 3.2 pwm 2.4 4.5 25 max 5.5 5.5 batt 8 8 70 unit v v v v v c
3 CXA2534Q block diagram t s d b t l b t l b t l p o w e r o n / o f f e m p t y d e t e c t r e s e t s w d r i v e r e r r o r o v e r v o l t a g e p r o t e c t t r i a n g l e w a v e g e n s h o r t p r o t e c t c h a r g e r t s d p r e - d r i v e r p r e - d r i v e r p e a k d e t e c t p w m d r i v e r w i r e d r e m o t e m u t e m u t e b r a k e 1 2 3 4 5 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 3 0 3 1 3 2 3 3 3 4 3 5 3 6 3 7 3 8 3 9 4 1 4 2 4 3 4 4 4 5 4 6 4 7 4 8 4 0 s p i n p g n d s l b r a k e s l e d i n f t m u t e f o c u s i n t r a c k i n v c c 2 v r e f v c c 1 o p + o p o s p m u t e p v c c t r a c k t r a c k + f o c u s f o c u s + p v c c s l e d s l e d + s p s p + e m p r e s e t o f f p w m f i l p g n d p s w s t a r t k e y i n r e m o b a t t d c i n g n d i s e t c h g v c c s e l b s e n b a t t s w d e a d e o e i s p r t t r t c c l k o p p r e - d r i v e r 6 g n d p g n d b t l p r e - d r i v e r
4 CXA2534Q pin description pin no. 1 2 48 3 4 5 symbol op o op+ opC v cc 1 vref v cc 2 pin voltage 3.2 v 1.6 v 3.2 v equivalent circuit description output pin of built-in operational amplifier non-inverting input pin of operational amplifier inverting input pin of operational amplifier power supply input to dc-dc controller circuits reference voltage power supply input to pre-driver circuits 1 v c c 1 v c c 1 v c c 1 v c c 1 2 4 8 v c c 2 4 3 0 k 7 5 k 4
5 CXA2534Q pin no. 6 7 9 8 10 11 28 12 13 symbol track in focus in sled in ft mute sl brake pgnd sp in sp mute pin voltage 1.6 v 0 v 0 v 1.6 v 0 v equivalent circuit description tracking error signal input pin focus error signal input pin sled error signal input pin focus and tracking mute input pin sled motor brake input pin power ground for h-bridge drivers spindle error signal input pin spindle mute input v c c 2 1 1 k 6 7 9 v c c 2 7 5 k 7 5 k 8 1 0 v c c 2 7 . 5 k 1 2 v c c 2 7 5 k 7 5 k 7 5 k 7 5 k 1 3
6 CXA2534Q pin no. 14 19 15 16 17 18 20 21 22 23 24 25 symbol pv cc trackC track+ focusC focus+ sledC sled+ spC sp+ emp reset pin voltage v cc 1 equivalent circuit description power supply input for h-bridge drivers negative output pin to tracking motor positive output pin to tracking motor negative output pin to focus motor positive output pin to focus motor negative output pin to sled motor positive output pin to sled motor negative output pin to spindle motor positive output pin to spindle motor battery empty detection output pin reset output pin 2 4 1 6 1 8 2 0 2 2 1 5 1 7 1 9 2 1 1 1 1 4 1 9 2 8 v c c 1 v c c 1 9 0 k 2 5
7 CXA2534Q pin no. 26 27 29 symbol off pwmfil psw pin voltage v cc 1 equivalent circuit description input pin to put ic into standby mode pwm filter pin pwm switching output pin v c c 1 v c c 1 3 0 k 1 8 0 k 2 6 v c c 2 v c c 2 2 k 2 k 2 7 b a t t b a t t 1 5 2 9
8 CXA2534Q pin no. 30 31 32 33 34 35 36 symbol start key in remo batt dc in gnd iset chgv cc pin voltage batt 0 v 0 v 1.2 v 4.5 v equivalent circuit description input pin to start the ic input pin from wired remote to start the ic power supply to the built-in wired remote interface circuit input pin to start the ic when ac adapter is inserted ground set charging current of built-in battery charger power supply input to the battery charger b a t t b a t t 3 0 3 9 0 k 2 0 0 k b a t t 5 0 k 2 0 0 k 3 0 k 1 0 0 k 3 1 3 2 3 3 c h g v c c 9 5 0 3 5
9 CXA2534Q pin no. 37 38 39 40 symbol sel bsen batt sw pin voltage batt 2.4 v equivalent circuit description detection input pin for battery or ac adapter operation and battery charging current output pin detection input pin for battery empty detection battery input pin dc to dc controller output pulses 6 8 k b a t t 2 2 0 k 3 0 k 3 7 b a t t 7 1 k 1 0 k 1 9 k 1 1 . 5 k 3 8 1 6 . 5 k b a t t b a t t b a t t 2 5 0 9 k 4 0
10 CXA2534Q pin no. 41 42 43 44 symbol dead eo ei sprt pin voltage 0.88 v 1.2 v 0 v equivalent circuit description soft start pin output pin of error amplifier input pin of error amplifier short protection pin v c c 1 5 0 k 1 8 k 6 5 k 4 1 v c c 1 v c c 1 4 2 v c c 1 v c c 1 2 1 k 3 5 k 4 3 v c c 1 v c c 1 2 2 0 k 4 4
11 CXA2534Q pin no. 45 46 47 symbol tr tc clk pin voltage 1.2 v equivalent circuit description together with the capacitor at tc, set the start-up and free running frequency of sawtooth together with the resistor at tr, set the start-up and free running frequency of sawtooth synchronizing clock pulse input v c c 1 5 k 4 5 v c c 1 b a t t 4 2 0 k 4 6 3 2 v c c 1 1 0 k 4 7
12 CXA2534Q electrical specifications if not specified, ta=25 c, batt=2.4 v, v cc 1=v cc 2=3.2 v, vref=1.6 v, chgv cc =0 v, fclk=88.2 khz * in means sp in, sled in, focus in or track in. item 1. overall batt standby current batt quiescent current v cc 1 quiescent current v cc 2 quiescent current chgv cc quiescent current 2. h-bridge driver spindle voltage gain sled focus track gain difference spindle input impedance sled focus track spindle maximum sled output voltage focus track upper tr spindle saturation sled voltage focus track lower tr spindle saturation sled voltage focus track input offset voltage spindle output offset sled voltage focus track spindle dead band sled focus track spindle mute on spindle mute off sled brake on sled brake off symbol i st i bat iv cc 1 iv cc 2 ichgv cc gv (sp) gv (sled) gv (focus) gv (track) ? gv rin (sp) rin (sled) rin (focus) rin (track) vom (sp) vom (sl) vom (foc) vom (tra) v sat (sp) v sat (sl) v sat (foc) v sat (tra) v satl (sp) v satl (sl) v satl (foc) v satl (tra) v oi v oo (sp) v oo (sled) v oo (focus) v oo (track) v db (sp) v db (sled) v db (focus) v db (track) v msp(on) v msp(off) v bsl(on) v bsl(off) min. 21.9 14 14 14 C2 5.7 8.8 8.8 8.8 1.9 1.9 1.9 1.9 C5 C50 C5 C10 C10 C10 2 2 typ. 0 2 4.9 4.2 0.79 23.9 15.5 15.5 15.5 0 7.5 11 11 11 2.1 2.05 2.05 2.05 280 280 230 230 230 250 200 200 0 0 20 15 15 15 max. 2 3.2 6.7 6.4 1.2 25.9 17 17 17 2 11 15 15 15 400 400 400 400 400 400 400 400 5 50 45 40 40 40 0.8 0.8 unit a ma ma ma ma db db db db db k k k k v v v v mv mv mv mv mv mv mv mv mv mv mv mv mv mv v v v v condition batt=9 v, v cc 1=v cc 2=0 v pv cc =pwm, ft mute=3.2 v pv cc =0.45 v, ft mute=3.2 v, ei=0 v pv cc =0.45 v, ft mute=3.2 v chgv cc =4.5 v, rch=open in * =1.7 and 1.8 v in=0 and 3.2 v, pv cc =4 v io=400 ma, sp in=0 and 3.2 v io=300 ma, sled in=0 and 3.2 v io=200 ma, focus in=0 and 3.2 v io=200 ma, track in=0 and 3.2 v io=400 ma, sp in=0 and 3.2 v io=300 ma, sled in=0 and 3.2 v io=200 ma, focus in=0 and 3.2 v io=200 ma, track in=0 and 3.2 v vref=in=1.6 v sp in=1.8v sp in=1.8v sled in=1.8v sled in=1.8v
13 CXA2534Q item focus/track mute on focus/track mute off vref on voltage vref off voltage 3. pwm driver for pv cc psw output current pvcc shift voltage pvcc leakage current pwm transconductance 4. dc to dc converter 4.1 error amplifier vcc1 threshold voltage hi error output voltage lo error output voltage sprt voltage (normal) sprt output current (eo=h) sprt output current (off=l) sprt output current (over-voltage) sprt impedance sprt threshold voltage over voltage protect threshold 4.3 sawtooth waveform sw high output voltage (starting) sw high output voltage (normal) sw low output voltage sw start freq sw free running freq sw synchronized freq start freq duty cycle free freq duty cycle synchronized freq duty cycle 4.4 soft start dead pin impedance dead pin voltage symbol v mft (on) v mft (off) vref (on) vref (off) i psw v shif ipv cc (leakage) g pwm v cc 1 th v eoh v eol v spr i spr1 i spr2 i spr3 r spr v spr (th) v bsen (th) v swh (start) v swh (nor) v swl (nor) f sw1 f sw2 f sw3 d sw1 d sw2 d sw3 r dead v dead min. 2 1.2 10 0.2 1/67.5 3.05 1.5 6 12 12 154 1.1 8 0.78 1 55 60 45 70 65 55 0.72 typ. 13 0.3 0 1/50 3.2 1.65 0.05 10 20 20 220 1.23 8.4 0.98 1.5 0.1 85 70 88.2 55 80 75 80 0.82 max. 0.8 0.8 17 0.4 3 1/32.5 3.37 0.2 0.1 16 32 32 297 1.36 9 1.13 0.4 115 82 65 90 85 105 0.92 unit v v v v ma v a 1/k v v v v a a a k v v v v v khz khz khz % % % k v condition focus in=1.8 v focus in=1.8 v sp in=1.8 v sp in=1.8 v sled in=2.1 v sled in=1.8 v, pv cc Csled+ pv cc =9 v, v cc 1=v cc 2=batt=0 v sl in=1.8 v, pv cc =1.2 to 1.4 v ei=0.7 v, io=C100 a ei=1.36 v, io=100 a ei=1.36 v ei=0.7 v, v spr =0 v ei=1.36 v, off=0 v, v spr =0 v ei=1.36 v, batt=9.5 v, v spr =0 v ei=0.7 v, tc=0 v bsen voltage batt=tc=1.5 v, v cc 1=v cc 2=0 v, io=C2 ma, start=lo tc=0 v, io=C10 ma, ei=0.7 v sprt=0 v tc=2 v, io=10 ma tc=420 pf, v cc 1=v cc 2=0 v, start=lo tc=420 pf, clk=0 v tc=420 pf, clk=88.2 khz tc=420 pf, v cc 1=v cc 2=0 v tc=420 pf, ei=0.7 v, clk=0 v tc=420 pf, ei=0.7 v 4.2 short circuit and over voltage protection
14 CXA2534Q item 4.5 input off threshold voltage off current start on threshold voltage start off threshold voltage start pin current clock input voltage high low clock current 4.6 start start cut threshold voltage start cut hysteresis discharge threshold voltage 5. empty empty detect threshold 1 empty detect threshold 2 empty detect hysteresis empty detect hysteresis empty pin voltage empty pin leakage current bsen pin impedance bsen pin leakage current sel pin threshold voltage sel pin threshold current 6. reset reset threshold voltage reset hysteresis reset pin reset pin impedance 7. op amp input bias current input offset voltage high output voltage low output voltage output current (source) output current (sink) open loop gain slew rate symbol v off (th) i off v start1 v start2 i start v clkh v clkl i clk v st (th) v st (hs) v dis v empt1 v empt2 v emph1 v emph2 v emp i empl r bsen i bsenl v sel (th) i sel (th) v rst (th) v rst (hy) v rst r rst i bias v io v oh v ol i sou i sin g vo sr min. 55 battC 0.3 9 2 2.3 1.25 1.9 1.5 16.5 1.3 C2 85 66 C5 2.9 0.4 0.5 typ. 80 14 5 2.5 200 1.45 2.0 1.6 50 50 22.8 90 50 88 0 C8.5 0.8 70 1 max. v cc C2 105 battC1 19 0.8 10 2.7 1.65 2.1 1.7 0.5 1 29 1 95 0.4 118 250 5 0.2 C3 1.5 unit v a v v a v v a v mv v v v mv mv v a k a v a % mv v k na mv v v ma ma db v/ s condition ei=1.36 v off=0 v v cc 1=v cc 2=0 v, tc=2 v v cc 1=v cc 2=0 v, tc=2 v start=0 v clk=3.2 v v cc 1=v cc 2=0 v ? 3.2 v, start=0 v start=0 v vsel=0 v (sel=low) isel=C2 a (sel=hi z) vsel=0 v (sel=low) isel=C2 a (sel=hi z) io=1 ma, bsen=1 v bsen=2.4 v vsel=0 v v cc 1=v cc 2=0 v, bsen=4.5 v v sel (th)=battCsel, bsen=2 v io=1 ma, v cc 1=v cc 2=2.8 v op+=1.6 v rl=open rl=open rl=50 to gnd rl=50 to v cc 1 vin=C75 db, f=1 khz
15 CXA2534Q item 8. battery charger rchg pin voltage rchg pin impedance sel pin leakage current (rchg=open) sel pin leakage current (chgv cc =0.6 v) sel pin voltage dc in pin threshold voltage key in pin threshold current symbol v rchg r rchg i sel1 i sel2 v sel v dcin (th) i keyin (th) min. 0.7 0.68 1 typ. 0.8 0.96 0.45 max. 0.9 1.16 1 1 1 5 unit v k a a v v a condition chgv cc =4.5 v, iset=1.8 k chgv cc =4.5 v, iset=0.5 and 0.6 v chgv cc =4.5 v, iset=open chgv cc =0.6 v, iset=1.8 k chgv cc =4.5 v, io=300 ma, iset=0 batt=4 v, v cc 1=v cc 2=0 v, tc=2 v, dc=in=from 0 to 3 v batt=4 v, v cc 1=v cc 2=0 v, tc=2 v, ikeyin=from 0 to 10 a 9. wired remote interface
16 CXA2534Q electrical characteristics test circuit p 1 v 1 4 s 2 1 4 7 0 . 1 v 1 0 v 9 v 8 v 6 v 2 0 0 v 5 v 4 v 3 1 k v 2 v 1 8 , 1 . 5 w r 4 r 3 5 1 k r 6 r 7 r 9 a a a a a a a a a a a a b c b b b b b b b b b b b 8 , 1 . 5 w a a b b 8 , 1 . 5 w a a b b 8 , 1 . 5 w a a a b b b i 4 i 3 i 2 s 1 7 _ 1 s 1 7 _ 2 s 1 6 s 1 5 s 1 4 s 1 3 s 1 2 s 1 1 s 1 0 s 9 s 8 v 1 1 c x a 2 5 3 4 i c 0 1 s 1 8 s 1 9 s 2 0 s 2 2 s 2 3 s 2 4 s 2 6 s 2 7 c 3 c 2 i 6 i 7 1 0 0 k v 1 6 v 1 5 v 1 0 0 v 1 7 v 1 8 v 1 9 v 2 1 v 2 0 2 2 0 0 p 1 0 p 1 . 8 k r 1 r 1 0 0 l 1 3 3 h b b b b b b b b b b c b b b b b b b b c d b a a a a a a a a a a a a a a a a a a a s 7 s 2 5 s 6 s 5 s 4 s 3 s 2 s 1 s 3 7 v 7 s i g r 1 1 r 1 5 5 0 s 3 8 _ 1 s 3 8 _ 2 r 1 0 1 0 k 1 0 k 4 7 0 c 3 i 8 i 9 i 1 0 i 1 1 i 1 2 i 1 3 s 2 8 s 2 9 s 3 0 s 3 1 s 3 2 s 3 3 s 3 4 s 3 5 s 3 6 _ 1 s 3 6 _ 2 v 2 2 v 2 3 v 2 4 v 2 5 v 2 6 v 2 7 r 8 r 5 3 9 k v 2 9 v 2 8 v 1 3 v 1 2 i 5 c 1 d 1 r b 4 0 0 d c 1 0 2 s a 1 5 8 5 s 4 7 0 p c 4 r e s e t o f f p w m f i l p g n d p s w s t a r t k e y i n r e m o b a t t d c i n g n d i s e t c h g v c c s p i n p g n d s l b r a k e s l e d i n f t m u t e f o c u s i n t r a c k i n v c c 2 v r e f v c c 1 o p + o p o s e l b s e n b a t t s w d e a d e o e i s p r t t r t c c l k o p e m p s p + s p s l e d + s l e d p v c c f o c u s + f o c u s t r a c k + t r a c k p v c c s p m u t e r 1 2 r 1 3 r 1 4 1 m 2 0 k 1 0 0 k i 1 4 7 r 2 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 3 0 3 1 3 2 3 3 3 4 3 5 3 6 3 7 3 8 3 9 4 0 4 1 4 2 4 3 4 4 4 5 4 6 4 7 4 8
17 CXA2534Q application circuit t s d b t l b t l b t l b t l s e r v o p r o c e s s o r p o w e r o n / o f f e m p t y d e t e c t r e s e t s w d r i v e r e r r o r o v e r v o l t a g e p r o t e c t t r i a n g l e w a v e g e n s h o r t p r o t e c t t s d p r e - d r i v e r p r e - d r i v e r p r e - d r i v e r p r e - d r i v e r p e a k d e t e c t p w m d r i v e r w i r e d r e m o t e m u t e m u t e b r a k e 1 2 3 4 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 3 0 3 1 3 2 3 3 3 4 3 6 3 7 3 8 3 9 4 2 4 3 4 4 4 5 4 6 4 7 4 8 4 0 s p i n p g n d s l b r a k e s l e d i n f t m u t e f o c u s i n t r a c k i n v c c 2 v r e f v c c 1 o p + o p o s p m u t e p v c c t r a c k t r a c k + f o c u s f o c u s + p v c c s l e d s l e d + s p s p + e m p r e s e t o f f p w m f i l p g n d p s w s t a r t k e y i n r e m o b a t t d c i n g n d i s e t c h g v c c s e l b s e n b a t t s w d e a d e o e i s p r t t r t c c l k o p d c - d c c o n v e r t o r p l a y / p a u s e s t o p f . f . f . r . 5 c h a r g e r 3 5 2 0 2 1 4 7 0 . 1 g n d g n d 4 7 0 p 3 9 k 8 . 2 k 0 . 1 0 . 1 0 . 0 2 2 g n d 1 0 0 k 2 2 0 0 p 3 3 h 1 0 p g n d g n d p l a y 1 . 4 k 0 . 1 1 4 7 4 7 1 0 0 g n d p g n d g n d g n d g n d g n d g n d g n d p g n d p g n d p g n d p g n d g n d 4 1 s p i n d l e m o t o r s l e d m o t o r f o c u s c o i l t r a c k i n g c o i l t o s y s t e m m i c r o c o n t r o l l e r t o s y s t e m m i c r o c o n t r o l l e r a c a d a p t e r i n p u t w i r e d r e m o t e b o a r d application circuits shown are typical examples illustrating the operation of the devices. sony cannot assume responsibility fo r any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same .
18 CXA2534Q description of operation 1. h-bridge driver a) gain setting the input resistances of the sled, focus and track channels are 11 k (typical); the input resistance of the spindle channel is 7.5 k (typical). the gain can be adjusted by connecting a external resistor, r at the input pin of the channel. channel sled channel focus channel track channel spindle channel 55 k g v = 20 log 11 k + r 110 k g v = 20 log 7.5 k + r unit db db r - external resistor b) mute the spindle channel operates normally when the sp mute (pin 13) is open or at low (below 0.8 v). the output will be muted when the sp mute pin is at high (above 2 v). this is a high impedance mute as the spindle output voltage will be not pulled to low. the focus and track channels share the same mute pin (pin 8). the channels are muted when the ft mute pin (pin 8) is open or at low level (below 0.8 v). when the focus and track channels are muted, the quiescent current at the v cc 2 pin is also reduced by almost half. this is because the bias are removed when the mute is on. c) thermal shutdown the h-bridge driver has an internal thermal shutdown circuit. all the channels outputs will be muted when the chip temperature exceeds 170 c (typical) and restored when the chip temperature falls to 140 c (typical). d) vref pin when the vref pin (pin 4) is below 1 v (typical), the h-bridge driver will be at standby mode and the quiescent current is zero (typical). e) dead band dead band = 2 input resistance (attached external resistor + internal resistor) 0.5 a the dead band is depended on input resistance. thus, the dead band varies with the gain settings. the dead band is 7.5 mv for spindle channel and 11 mv for sled, focus and track channels.
19 CXA2534Q f) pwm driver for pv cc to ensure the good power efficiency of the h-bridge driver, a buck dc-to-dc converter may be used to regulate the pv cc . the controller selects the peak voltage among the channels and used it to control the duty cycle of the pwm. external components necessary are: pnp transistor, inductor coil, diode and capacitors. the configuration of a buck dc-to-dc converter is shown as follow: g) bypass capacitor to have prevent noise, a bypass capacitor (roughly 0.1 f) is connected from pv cc pin to the gnd pin as close as possible. 1 4 1 9 2 7 2 9 p w m f i l p s w p v c c p v c c b a t t 4 7 3 3 4 7 f 0 . 1 f c x a 2 5 3 4 q 2 2 0 0 p f 1 0 0 k 1 0 p f
20 CXA2534Q b) short circuit protection if the v cc 1 falls below the designed voltage for a long time, it will be considered as a short circuit at the v cc 1. in this case, the ic will detect this prolong drop in v cc 1 and turn off the ic. when the v cc 1 is below the designed voltage, the error amplifier will output an high at its eo pin (pin 42). the high level at eo pin will cause the sprt pins capacitor (pin 44) to charge up by a constant current of 10 a. once the voltage is above 1.23 v (typical), the ic will turn off. the duration of the short circuit can be varied by the sprt pins capacitor. t = 1.23v c sprt (sec) 10 a 3 4 3 c x a 2 5 3 4 q r 1 r 3 r 2 r 4 e i v c c 1 1 . 2 3 v 2. dc-to-dc converter a) v cc 1 voltage setting the v cc 1 voltage can be adjusted by varying the two external resistors, r1 and r2. the formula for v cc 1 voltage setting is: r 1 r 3 + r 2 r 4 v cc 1 = 1.23 r 1 +r 3 r 2 +r 4 (v) r 2 r 4 r 2 + r 4 where r 1 - external resistor r 2 - external resistor r 3 - 35 k r 4 - 21 k
21 CXA2534Q c) soft start during start-up of the ic, the duty cycle of the dc-to-dc converter is increased slowly to a maximum of 80 %. the v cc 1 voltage will also increase slowly. this is known as soft start. during the soft start, the duty cycle of the sw pin (pin 40) is dependent on the voltage at the dead pin (pin 41). the dead pin is connected to a capacitor which is being charged up by an internal resistance of 65 k . therefore, the time taken for the duty cycle to reach the maximum is t = c sprt r (sec) where r = 65 k d) power off to turn off the dc-to-dc converter, a low level is applied to the off pin (pin 26). when the off pin is low, the ic will not turn off the dc-to-dc converter immediately but will charge up the sprt pins capacitor with a constant current of 20 a. once the sprt pins voltage is above 1.23 v, the ic will then shut down. therefore, the delay is given by the formula below: t = 1.23 v c sprt (sec) 20 a e) over-voltage protection the ic will detect a over-voltage if the voltage at the bsen pin is above 8.4 v (typical). when over- voltage occurred, the ic will shut down after a time delay. the time delay is determined by the time taken for the sprt pins capacitor to charge above 1.23 v. the charging current for the sprt pin capacitor is constant and is 20 a. t = 1.23 v c sprt (sec) 20 a f) reset pulse when the v cc 1 voltage rises above 90 % of the designed value, the reset pin (pin 25) will change from low level to high level. a hysteresis of 50 mv (typical) is implemented to prevent the chattering of the output at reset pin. g) empty detection the emp pin (pin 24) is used to indicate low battery voltage. when the bsen pin falls below a certain threshold voltage, the emp pin will change from high to low level. there are two threshold voltages, depending on the sel pin (pin 37). in order to prevent chattering of the output at the emp pin, a hysteresis of 50 mv (typical) is implemented. sel pin low high - z threshold voltage (typical) 2.0 v 1.6 v recovery voltage (typical) 2.05 v 1.65 v
22 CXA2534Q 3. battery charger the battery charger is separated from the rest of the circuit. the chgv cc pin (pin 36) is the power supply pin to the charger circuit. the charging current is drawn in from the sel pin (pin 37) and can be set by an external resistor at iset pin (pin 35). the charger has a built-in thermal shut down circuit. the shut down temperature is set to 170 c and 140 c is the recovery temperature. 4. wired remote interface when the ic is at standby, it can be activated by pulling the start pin (pin 30) or the key in pin (pin 31) low. the start pin is controlled by the play button on the main set and the key in pin is controlled by the play button on the wired remote control panel. the wired remote interface circuit is powered at remo batt pin (pin 32) which is connected to the batt. to ensure that the voltage at remo batt pin is not greater than v cc 1, a resistor and zener diode (vz=3.1 v) may be necessary. the dc in pin (pin 33) will detect a pulse through a series capacitor when a ac adapter is power on. this pulse will activate the ic also.
s o n y c o d e e i a j c o d e j e d e c c o d e m p a c k a g e s t r u c t u r e p a c k a g e m a t e r i a l l e a d t r e a t m e n t l e a d m a t e r i a l p a c k a g e m a s s e p o x y r e s i n s o l d e r / p a l l a d i u m p l a t i n g 4 2 / c o p p e r a l l o y 4 8 p i n q f p ( p l a s t i c ) 1 5 . 3 0 . 4 1 2 . 0 0 . 1 + 0 . 4 0 . 8 0 . 3 0 . 1 + 0 . 1 5 0 . 2 4 1 3 2 4 2 5 3 6 3 7 4 8 1 1 2 2 . 2 0 . 1 5 + 0 . 3 5 0 . 9 0 . 2 0 . 1 0 . 1 + 0 . 2 1 3 . 5 0 . 1 5 0 . 0 5 + 0 . 1 q f p - 4 8 p - l 0 4 q f p 0 4 8 - p - 1 2 1 2 0 . 7 g 0 . 1 5 package outline unit : mm CXA2534Q 23 n o t e : p a l l a d i u m p l a t i n g t h i s p r o d u c t u s e s s - p d p p f ( s o n y s p e c . - p a l l a d i u m p r e - p l a t e d l e a d f r a m e ) .

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