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semiconductor group 1 tca 785 this phase control ic is intended to control thyristors, triacs, and transistors. the trigger pulses can be shifted within a phase angle between 0 ? and 180 ?. typical applications include converter circuits, ac controllers and three-phase current controllers. this ic replaces the previous types tca 780 and tca 780 d. (top view) pin configuration phase control ic tca 785 pb-free lead plating; rohs compliant bipolar ic features l reliable recognition of zero passage l large application scope l may be used as zero point switch l lsl compatible l three-phase operation possible (3 ics) l output current 250 ma l large ramp current range l wide temperature range pg-dip-16-1 type ordering code package tca 785q67000-a2321pg-dip-16-1 pin symbol function 1 gnd ground 2 3 4 q2 q u q2 output 2 inverted output u output 1 inverted 5 v sync synchronous voltage 6 7 i q z inhibit output z 8 v ref stabilized voltage 9 10 r 9 c 10 ramp resistance ramp capacitance 11 v 11 control voltage 12 c 12 pulse extension 13 l long pulse 14 15 q 1 q 2 output 1 output 2 16 v s supply voltage pin definitions and functions 02.05
semiconductor group 2 tca 785 functional description the synchronization signal is obtained via a high-ohmic resistance from the line voltage (voltage v 5 ). a zero voltage detector evaluates the zero passages and transfers them to the synchronization register. this synchronization register controls a ramp generator, the capacitor c 10 of which is charged by a constant current (determined by r 9 ). if the ramp voltage v 10 exceeds the control voltage v 11 (triggering angle j ), a signal is processed to the logic. dependent on the magnitude of the control voltage v 11 , the triggering angle j can be shifted within a phase angle of 0? to 180?. for every half wave, a positive pulse of approx. 30 m s duration appears at the outputs q 1 and q 2. the pulse duration can be prolonged up to 180? via a capacitor c 12 . if pin 12 is connected to ground, pulses with a duration between j and 180? will result. outputs and supply the inverse signals of q 1 and q 2. a signal of j +180? which can be used for controlling an external logic,is available at pin 3. a signal which corresponds to the nor link of q 1 and q 2 is available at output q z (pin 7). the inhibit input can be used to disable outputs q1, q2 and , . pin 13 can be used to extend the outputs and to full pulse length (180? e j ). q 1 q 2 q 1 q 2 q 1 q 2 block diagram
semiconductor group 3 tca 785 pulse diagram
semiconductor group 4 tca 785 unit parameter symbol min. max. limit values absolute maximum ratings v supply voltage v s e 0.5 18 ma output current at pin 14, 15 i q e 10 400 k/w thermal resistance system - air r th sa 80 v v v inhibit voltage control voltage voltage short-pulse circuit v 6 v 11 v 13 e 0.5 e 0.5 e 0.5 v s v s v s m a synchronization input current v 5 e 200 200 v output voltage at pin 14, 15 v q v s ma output current at pin 2, 3, 4, 7 i q 10 v output voltage at pin 2, 3, 4, 7 v q v s ?c ?c junction temperature storage temperature t j t stg e 55 150 125 operating range v supply voltage v s 818 hz operating frequency f 10 500 ?c ambient temperature t a e 25 85 characteristics 8 v s 18 v; e 25 ?c t a 85 ?c; f = 50 hz unit parameter symbol min. max. limit values test circuit typ. ma supply current consumption s1 s6 open v 11 = 0 v c 10 = 47 nf; r 9 = 100 k w i s 4.5 1 6.5 10 m a mv synchronization pin 5 input current r 2 varied offset voltage i 5 rms d v 5 30 1 4 30 200 75 v k w control input pin 11 control voltage range input resistance v 11 r 11 0.2 1 5 15 v 10 peak
semiconductor group 5 tca 785 characteristics (cont?d) 8 v s 18 v; e 25 ?c t a 85 ?c; f = 50 hz unit parameter symbol min. max. limit values test circuit typ. m a v mv k w m s ramp generator charge current max. ramp voltage saturation voltage at capacitor ramp resistance sawtooth return time i 10 v 10 v 10 r 9 t f 10 100 3 1 1.6 1 1 225 80 1000 v 2 e 2 350 300 v v m s m a m a inhibit pin 6 switch-over of pin 7 outputs disabled outputs enabled signal transition time input current v 6 = 8 v input current v 6 = 1.7 v v 6 l v 6 h t r i 6 h e i 6l 4 1 80 1 1 1 1 1 3.3 3.3 500 150 2.5 5 800 200 v v m a m a long pulse switch-over pin 13 switch-over of s8 short pulse at output long pulse at output input current v 13 = 8 v input current v 13 = 1.7 v v 13 h v 13 l i 13 h e i 13 l 3.5 45 1 1 1 1 2.5 2.5 65 2 10 100 % % % deviation of i 10 r 9 = const. v s = 12 v; c 10 = 47 nf deviation of i 10 r 9 = const. v s = 8 v to 18 v deviation of the ramp voltage between 2 following half-waves, v s = const. i 10 i 10 d v 10 max e 5 e 20 1 1 1 5 20 m a v outputs pin 2, 3, 4, 7 reverse current v q = v s saturation voltage i q = 2 ma i ceo v sat 0.1 2.6 2.6 0.4 10 2
semiconductor group 6 tca 785 characteristics (cont?d) 8 v s 18 v; e 25 ?c t a 85 ?c; f = 50 hz unit parameter symbol min. max. limit values test circuit typ. v v m s m s/ nf outputs pin 14, 15 h-output voltage e i q = 250 ma l-output voltage i q = 2 ma pulse width (short pulse) s9 open pulse width (short pulse) with c 12 v 14/15 h v 14/15 l t p t p v s e 3 0.3 20 530 3.6 2.6 1 1 v s e 2.5 0.8 30 620 v s e 1.0 2 40 760 v 1/k internal voltage control reference voltage parallel connection of 10 ics possible tc of reference voltage v ref a ref 2.8 1 1 3.1 2 10 e 4 3.4 5 10 e 4
semiconductor group 7 tca 785 pulse extension versus temperature ramp capacitance triggering point charge current the minimum and maximum values of i 10 are to be observed min max t tr = c 10 500 pf 1 m f 1) 2) i 10 = 2) v 11 r 9 c 10 v ref k v ref k r 9 v 10 max = v s e 2 v v 10 = v ref k t r 9 c 10 2) ramp voltage application hints for external components 1) attention to flyback times 2) k = 1.10 20 %
semiconductor group 8 tca 785 supply current versus supply voltage output voltage measured to + v s
semiconductor group 9 tca 785 test circuit 1 it is necessary for all measurements to adjust the ramp with the aid of c 10 and r 9 in the way that 3 v v ramp max v s e 2 v e.g. c 10 = 47 nf; 18 v: r 9 = 47 k w ; 8 v: r 9 = 120 k w
semiconductor group 10 tca 785 test circuit 2 test circuit 3 the remaining pins are connected as in test circuit 1 the remaining pins are connected as in test circuit 1
semiconductor group 11 tca 785 test circuit 4 remaining pins are connected as in test circuit 1 the 10 m f capacitor at pin 5 serves only for test purposes test circuit 5 test circuit 6
semiconductor group 12 tca 785 inhibit 6 long pulse 13 pulse extension 12 reference voltage 8
semiconductor group 13 tca 785 a phase control with a directly controlled triac is shown in the figure. the triggering angle of the triac can be adjusted continuously between 0? and 180? with the aid of an external potentiometer. during the positive half-wave of the line voltage, the triac receives a positive gate pulse from the ic output pin 15. during the negative half-wave, it also receives a positive trigger pulse from pin 14. the trigger pulse width is approx. 100 m s. application examples triac control for up to 50 ma gate trigger current
semiconductor group 14 tca 785 shown is the possibility to trigger two antiparalleled thyristors with one ic tca 785. the trigger pulse can be shifted continuously within a phase angle between 0? and 180? by means of a potentiometer. during the negative line half-wave the trigger pulse of pin 14 is fed to the relevant thyristor via a trigger pulse transformer. during the positive line half-wave, the gate of the second thyristor is triggered by a trigger pulse transformer at pin 15. fully controlled ac power controller circuit for two high-power thyristors
semiconductor group 15 tca 785 half-controlled single-phase bridge circuit with trigger pulse transformer and direct control for low-power thyristors
semiconductor group 16 tca 785 half-controlled single-phase bridge circuit with two trigger pulse transformers for low-power thyristors

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