rev. 4748a?indco?08/03 features phase controlled thyristor ignition triggering with time delay repetition time delay supply current 2 ma mains supply via resistor applications electric stapler devices description the monolithic integrated bipolar circuit, U490B, is a one-shot power control circuit, designed to control the thyristor which is mainly used in electric stapler devices. the ic is preferred to realize a one-shot phase control, where any phase angle, thus any intensity of the load voltage is adjustable. after successful triggering and the following delay time, an ignition pulse at the output is released. further triggering is only possi- ble after the delay time elapses. figure 1. block diagram trigger control repetition delay start delay sync. supply stage 3 8 4 phase control control input ramp por output stage 6 5 2 c 5 r 5 c 6 r 4 r 7 c 4 c 7 d 2 load c 2 r 2 v s r 1 d 1 r 3 c 3 s 1 l n 220 k 1.5 nf 24 k / 2 w 1n4007 47 f 10 v 230 v v mains gnd 150 nf 47 k ~68 k 220 k 47 nf 7 150 nf 33 220 w 47 nf/ 250 v~ 22 nf c 1 U490B one-shot phase control ic U490B
2 U490B 4748a?indco?08/03 pin configuration figure 2. pinning dip8/so8 supply, pin 8 the internal voltage limiter enables a simple supply from the mains via series resistor r 1 . the supply voltage between pin 8 (v s ) and ground (pin 4) builds up via r 1 and is smoothed by the capacitor c 1. the series resistor r 1 can be calculated as follows: where v mains mains supply voltage v smax maximum supply voltage i tot i smax + i x i smax maximum current consumption of the ic i x current consumption of the external components 1 2 3 4 5 6 7 8 n.c. trigger sync. gnd v s ramp output contr U490B pin description pin symbol function 1 n.c. not connected 2 trigger triggering 3 sync. synchronization 4 gnd ground 5 contr control input 6 ramp ramp 7 output output 8v s supply voltage r 1max 0.85 v mains v smax ? 2i tot ---------------------------------------
3 U490B 4748a?indco?08/03 phase control, pins 3, 5 and 6 the circuit is synchronized with mains supply through pin 3. as long as the switch s 1 is open, the circuit is in wait state, i.e., the capacitor c 6 (150 nf) is discharged and is kept in this state (high level). when the switch s 1 is closed, there is a current flow in pin 2 which is evaluated by the circuit. if this current flows after the delay time elapses, the phase control is released. the capacitor c 6 is then charged with i 6 + 100 a towards ground. at the same time, a current of 100 a flows into pin 5, which results in a volt- age drop across resistor r 5 . the control voltage v 5 is then 1.5 v lower internally. the output stage is released when the ramp voltage v 6 is equal to (v 5 ? 1.5 v). when the voltage difference is 150 mv, it is again turned-off. the result is an output pulse, whose phase shift to the zero crossing of the mains volt- age is determined by the resistor r 5 at the control input pin 5 (see figure 3). the capacitor c 6 is charged to a value of 1.5 v. this value is kept until the switch s 1 opens again and the repetition delay time has elapsed. the circuit is released when four periods of the line voltage have expired after build-up of the operating voltage, before the switch s 1 is closed. figure 3. signal characteristics closed open v 8 v 8 s 1 v 3 (sync.) v 2 (trigger) v 6 (ramp) (output) 0 50 ms 100 ms 150 ms 200 ms t v 6 v 7 t 150 mv "x" " x" t 1 v 5 - 1.5 v v 7 t p
4 U490B 4748a?indco?08/03 absolute maximum ratings stresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability . reference point pin 4 (gnd), unless otherwise specified parameters symbol value unit supply current, pin 8 t 10 s i s i s 30 150 ma ma output stage input voltage, pin 7 v i -0.5 to v s v input current, pins 2 and 3 t 1 ms i i i i 5 30 ma ma input voltage, pins 5 and 6 v i 0 to v 8 v junction temperature t j +125 c ambient temperature t amb -10 to +100 c storage temperature range t stg -40 to +125 c thermal resistance parameters symbol value unit junction ambient dip8 so8 on p.c. so8 on ceramic r thja r thja r thja 110 220 140 k/w k/w k/w electrical characteristics v s = 7 v, t amb = 25 c, reference point pin 4 (gnd), unless otherwise specified parameters test conditions/ pins symbol min. typ. max. unit supply voltage limitation i s = 3 ma pin 8 i s = 30 ma v s v s 7.2 7.4 8.2 8.4 9.2 9.4 v v current consumption v s = 7 v pin 8 i s 2ma voltag e m onitoring switch-on threshold switch-off threshold pin 8 v son v soff 5 3 v v synchronization voltage limitation i 3 = +1 ma pin 3 ? 8 i 3 = -1 ma v lim -v lim 1.5 0.75 v v switch-on threshold switch-off threshold pin 3 i to n i to f f 120 35 a a trigger input voltage limitation i 2 = +1 ma pin 2 ? 8 i 2 = -1 ma v lim -v lim 1.5 0.75 v v switch-on threshold switch-off threshold pin 2 i to n i to f f 120 35 a a start delay time repetition delay time f mains = 50 hz pin 2?7 t 1 t 2 40 60 60 80 ms ms
5 U490B 4748a?indco?08/03 package information phase control control input: input voltage range input current pin 5 2 v v 5 v 8 v i i i 2 50 90 v s 130 v a ramp charge current discharge current 2 v v 6 v 8 - 0.5 v v 5 = 4 v i ch -idis 50 2 90 130 a ma phase shif t c 6 = 150 nf, v 5 = 2 v v 5 = v 8 , pin 7?5 t dmax t dmin 7 600 ms s output stage, v 7 + 0 v, pin 7 output reverse current output current status off status on io(r) -io 100 10 a ma pulse width c 6 = 150 nf (see figure 3 on page 3) t p 100 200 300 s electrical characteristics (continued) v s = 7 v, t amb = 25 c, reference point pin 4 (gnd), unless otherwise specified parameters test conditions/ pins symbol min. typ. max. unit ordering information extended type number package remarks U490B-x dip8 tube U490B-xfp so8 tube U490B-xfpg3 so8 taped and reeled technical drawings according to din specifications package so8 dimensions in mm 5.00 4.85 0.4 1.27 3.81 1.4 0.25 0.10 5.2 4.8 3.7 3.8 6.15 5.85 0.2 85 14
6 U490B 4748a?indco?08/03
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