technical data dc-coupled vertical deflection circuit the kk a8356 is a power circuit for use in 90 o and 110 o ? colou r deflection systems for field frequen cies of 50 to 120 hz. the circuit provides a dc driven vertical deflection outpu t circuit, ope rating as a highly efficie n t clas s g sy stem . featur es ? few externa l components ? highly efficient fully dc-coupled vertical output b r idge circuit ? vertical fly b ack switc h ? guard circuit ? protection a gainst: ? short-circu i t of the outp u t pins (7 an d 4) ? short-circu i t of the outp u t pins to v p ? temperature (thermal) protection ? high emc i mmunit y because of co mmon mode inputs a guard sig nal in zoom mode pinning symb o l p i n de scri pt io n i dri v e(p o s) 1 input po we r-stage (p ositive ) ; inclu d e s i i(sb) signal bia s i dri v e(n eg) 2 input po we r-stage (n egativ e);in c lud e s i i(s b ) signal bia s v p 3 o p e rating sup p ly v o l t a g e v o(b) 4 output voltag e b g n d 5 gro u n d v fb 6 input flyback sup p ly voltage v o(a) 7 output voltag e a v o(guard ) 8 gua rd outp u t voltage v i(fb) 9 input feedb ack voltage block di agram 1
KKA8356 quick re fere nce data 3 s y m b o l p a r a m e t e r m i n . t y p . m a x . u n i t dc s upply v p sup p ly voltage 9 4.5 25 v i q quie s cent su pply cu rre nt ? 3 0 ? m a vertical circ uit i o(p - p ) o u t p u t cu rren t ? ? 2 a ( p eak- to-peak value) i diff(p-p ) differential in put cu rre nt (p eak-to-pea k value ) ? 6 0 0 ? a v diff(p-p ) differential in put voltage (p eak-to-pea k value ) ? 1 . 5 1 . 8 v fly b ack s w i t ch i m pea k output current ? ? + 1 a v fb flyback sup p l y voltage ? ? 5 0 v thermal data t stg storage temp eratu r e ?55 ? + 1 5 0 o c t amb ope rating am bient tempe r a t ure ?25 ? + 7 5 o c t vj virtual jun c tio n temperature ? ? 1 5 0 o c functional de scription the vertical driver circuit is a bridge configuratio n. the defle ction co il is connected b e tween the output amplifiers, which are driven in phase opposition. an external resistor (r m ) connected in series with the deflection coil provides internal feed back information. the differential inp u t circuit is voltage driven. an external resistor (r con ) connected between the differential input det ermines the output current through the deflection coil. the relat i onship betw een the diffe rential input current and the output current is defined by: i diff x ?r con = i coil x ?r m . the out put current is adjustable from 0.5 a (p-p ) to 2 a (p-p) by varying r m . the maximu m input diff erential volt age is 1 . 8 v . in the app lication it is recommend ed that v diff = 1.5 v (t yp). this is recommended because of the spread of input current and the spread in the value of r con. the flyback voltage is deter mined by an additional supply voltage v fb . the princip l e of operating with two supply voltages (cla ss g) makes it possible t o fix the su pply voltage v p optimum for t he scan voltage and the second sup p ly voltage v fb optimu m for the flyback voltage. using this method, very hig h efficien cy is achieved. the supply voltage v fb is almost totally avai lable as flyback voltage across the coil, this being possible due to the absence of a decoupling ca pacitor (not necessary, due to the bridge config uration) . the output circuit is fully protected ag ainst the following: ? thermal protection ? short-circu i t protection of the output p i ns (pins 4 a nd 7) ? short-circu i t of the output pins to v p . a guard circuit v o (guard ) is provided . the guard circuit is activated at the following co nditions: ? during flyback ? ?during short - circuit of th e coil and d u ring short-circuit of the output pins ( p ins 4 and 7 ) to v p or ground ? ?during open loop ? ?when the thermal protection is a c tivated. this sig nal can be used f o r blanking t he picture tu be screen. 2
li m i ting values s y m b o l p a r a mete r co nditio n s m i n . m a x . u n i t dc s upply v p sup p ly voltage non -op e ratin g ? 4 0 v ? 2 5 v v fb flyback sup p l y voltage ? 5 0 v vertical circ uit i o(p-p) output cu rren t (pea k-to -pe a k value) note 1 ? 2 a v o(a) output voltag e (pin 7 ) ? 5 2 v fly b ack s w i t ch i m pea k output current ? + 1 . 5 a thermal data t stg storage temp eratu r e ?5 5 + 1 5 0 o c t amb ope rating am bient tempe r a t ure ?2 5 + 7 5 o c t vj virtual jun c tio n temperature 150 o c r th v j -c re sist a n c e v j -ca s e 4 k / w r th v j -a re sist a n c e v j -ambie nt in free air 4 0 k / w t sc s h ort-c i rc uiting time note 2 1 hr notes 1. i o maximu m determined by current protection. 2. up to v p = 18 v. charact e ristics v p = 14.5 v; t amb = 25 c; v fb = 4 5 v; fi = 50 hz; i i(s b ) = 400 a; unless otherwise specified. s y m b o l p a r a mete r co nditio n s m i n . t y p . m a x . u n i t dc s upply v p ope rating sup p ly voltage 9.0 4.5 25 v v fb flyback sup p l y voltage v p ? 5 0 v i p sup p ly cu rre n t no sig nal; no load ? 3 0 5 5 m a vertical circ uit v o output voltag e swi ng (scan ) i diff = 0.6 ma ( p -p ); v diff = 1.8 v ( p -p ); i o = 2 a (p-p) 13.2 ? ? v l e l i n e a rity erro r i o = 2 a (p-p); ? 1 4 % i o = 50 ma (p-p); ? 1 4 % v o output voltag e swi ng (flyba ck) v o(a) - v o(b) i diff = 0.3 ma; i o = 1 a (m) ? 4 0 ? v v df forward volta ge of the internal efficien cy dio de (v o(a) - v fb ) i o = ?1 a (m); i diff = 0.3 ma ? ? 1 . 5 v _ i os _ output offset cu rre nt i diff = 0; i i(sb) = 50 to 500 p a ? ? 4 0 m a _ v os _ offset voltage at the input of the feedba ck am plifier (v i(fb) - v o(b) ) i diff = 0; i i(sb) = 50 to 5 0 0 p a ? ? 2 4 m v ' v os t output offset voltage as a f unctio n of temperatu r e i diff = 0 ? ? 7 2 p v/ k v o(a) dc o u tput voltage i diff = 0; ? 6 . 5 ? v g vo open -lo op vol t age gain (v 7-4 /v 1-2 ) ? 8 0 ? d b 3 KKA8356
? 8 0 ? d b open lo op vol t age gain (v 7-4 /v 9-4 ; v 1- 2 = 0) v r voltage ratio v 1-2 /v 9- 4 ? 0 ? d b f res frequ en cy respon se ( ?3 db) open lo op; ? 4 0 ? h z g i cu rre nt gain (i o /i di f f ) ? 5 0 0 0 ? ? g c t cu rre nt gain d r ift as a functi on of temperature 10 - ?4 k i i(sb) sign al bia s cu rre nt 50 400 500 a i fb flyback sup p l y current duri ng sca n ? ? 1 0 0 a psrr power sup p ly ripple reje ction ? 8 0 ? d b v i(dc) dc in put voltage ? 2 . 7 ? v v i(c m ) comm on mo d e input voltag e i i(sb) = 0 0 ? 1 . 6 v i bias input bia s cu rrent i i(sb) = 0 ? 0 . 1 0 . 5 a i o(c m ) comm on mo d e output cu rrent ? 0 . 2 ? m a ? i i(sb) = 300 a (p-p ); f i = 50 hz; i diff = 0 guard circ uit i o output cu rren t not active; v o(guard ) = 0 v ? ? 5 0 a ac tive; v o(guar d) = 4.5 v 1 ? 2 . 5 m a v o(guard ) output voltag e on pin 8 i o = 100 a ? ? 5 . 5 v allowable volt age on pi n 8 maximum lea k ag e cu rre nt = 10 a; ? ? 4 0 v v p = 13.5 v; i o(p-p) = 1.87 a; i i(sb ) = 400 a; i diff(p-p) = 500 a; v fb = 42 v; t fb = 0.6 ms. applicat ion diagram . 4 KKA8356
? 9- p i n p l as t i c p o w e r si n g l e - i n - l i n e ( s i l - 9 m p f , so t 131- 2) 19. 8 0. 026 24 -0 . 2 1 2. 54 0. 25 m 0. 65 0 . 05 1 9 3. 2 0. 15 12 -0 . 1 8 0. 4 0. 05 2 0. 06 4. 4 0. 1 5 1 6 .8 0.13 5 5 KKA8356
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