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rev. 4752a?indco?10/03 features internal frequency-to-voltage converter externally controlled integrated amplifier overload limitation with ?fold back? characteristic optimized soft-start function tacho monitoring for shorted and open loop automatic retriggering switchable triggering pulse typically 155 ma voltage and current synchronization internal supply-voltage monitoring temperature reference source current requirement 3ma description the integrated circuit U211B is designed as a phase-control circuit in bipolar technol- ogy with an internal frequency-to-voltage converter. the device includes an internal control amplifier which means it can be used for speed-regulated motor applications. amongst others, the device features integrated load limitation, tacho monitoring and soft-start functions, to realize sophisticated motor control systems. figure 1. block diagram control amplifier load limitation speed/time controlled voltage monitoring supply voltage limitation reference voltage output pulse pulse-blocking tacho monitoring frequency- to-voltage converter = f (v12) phase- control unit soft start 11(10) 12(11) 13(12) 9(8) 8(7) 18* voltage/current detector automatic retriggering 17(16) 1(1) 4(4) 5* -v s gnd + - -v ref 6(5) 7(6) 3(3) 2(2) 16(15) 10(9) 14(13) 15(14) controlled current sink pin numbers in brackets refer to so16 * pins 5 and 18 connected internally phase control ic with overload limitation for tacho applications U211B
2 U211B 4752a?indco?10/03 pin configuration figure 2. pinning dip18 1 2 3 4 5 6 7 8 10 9 18 17 16 14 15 13 12 11 v s output retr v rp c p f/v i sync gnd v ref ovl i sense c soft ctr/opo op+ pb/tm v sync c rv op- U211B pin description pin symbol function 1i sync current synchronization 2 gnd ground 3v s supply voltage 4 output trigger pulse output 5 retr retrigger programming 6v rp ramp current adjust 7c p ramp voltage 8 f/v frequency-to-voltage converter 9c rv charge pump 10 op- op inverting input 11 op+ op non-inverting input 12 ctr/opo control input/op output 13 c soft soft start 14 i sense load-current sensing 15 ovl overload adjust 16 v ref reference voltage 17 v sync voltage synchronization 18 pb/tm pulse blocking/tacho monitoring
3 U211B 4752a?indco?10/03 figure 3. pinning so16 v s output v rp c p f/v c rv i sync gnd 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 ovl i sense c soft op+ op- v sync v ref U211B ctr/opo pin description pin symbol function 1i sync current synchronization 2 gnd ground 3v s supply voltage 4 output trigger pulse output 5v rp ramp current adjust 6c p ramp voltage 7 f/v frequency-to-voltage converter 8c rv charge pump 9 op- op inverting input 10 op+ op non-inverting input 11 ctr/opo control input/op output 12 c soft soft start 13 i sense load-current sensing 14 ovl overload adjust 15 v ref reference voltage 16 v sync voltage synchronization
4 U211B 4752a?indco?10/03 mains supply the U211B is equipped with voltage limiting and can therefore be supplied directly from the mains. the supply voltage between pin 2 (+ pol/_|_) and pin 3 builds up across d 1 and r 1 and is smoothed by c 1 . the value of the series resistance can be approximated using: further information regarding the design of the mains supply can be found in the section ?design hints? on page 8. the reference voltage source on pin 16 of typically -8.9 v is derived from the supply voltage and is used for regulation. operation using an externally stabilized dc voltage is not recommended. if the supply cannot be taken directly from the mains because the power dissipation in r 1 would be too large, the circuit as shown in figure 4 should be used. figure 4. supply voltage for high current requirements phase control the phase angle of the trigger pulse is derived by comparing the ramp voltage (which is mains synchronized by the voltage detector) with the set value on the control input pin 12. the slope of the ramp is determined by c 2 and its charging current. the charging current can be varied using r 2 on pin 6. the maximum phase angle max can also be adjusted by using r 2 . when the potential on pin 7 reaches the nominal value predetermined at pin 12, a trig- ger pulse is generated whose width t p is determined by the value of c 2 (the value of c 2 and hence the pulse width can be evaluated by assuming 8 s/nf). at the same time, a latch is set, so that as long as the autom atic retriggering has not been activated, no more pulses can be generated in that half cycle. the current sensor on pin 1 ensures that, for operations with inductive loads, no pulse will be generated in a new half cycle as long as a current from the previous half cycle is still flowing in the opposite direction to the supply voltage at that instant. this makes sure that ?gaps? in the load current are prevented. the control signal on pin 12 can be in the range of 0 v to -7 v (reference point pin 2). if v 12 = -7 v, the phase angle is at maximum ( max ), i.e., the current flow angle, is at minimum. the phase angle is minimum ( min ) when v 12 = v 2 . r 1 v m v s ? 2 i s --------------------- = 123 4 5 c 1 r 1 24 v~ ~
5 U211B 4752a?indco?10/03 voltage monitoring as the voltage is built up, uncontrolled output pulses are avoided by internal voltage sur- veillance. at the same time, all latches in the circuit (phase control, load limit regulation, soft start) are reset and the soft-start capacitor is short circuited. used with a switching hysteresis of 300 mv, this system guarant ees defined start-up behavior each time the supply voltage is switched on or after short interruptions of the mains supply. soft start as soon as the supply voltage builds up (t 1 ), the integrated soft start is initiated. figure 5 shows the behavior of the voltage across the soft-start capacitor, which is identical with the voltage on the phase-control input on pin 12. this behavior guarantees a gentle start-up for the motor and automatically ensures the optimum run-up time. figure 5. soft start c 3 is first charged up to the starting voltage v 0 with a current of typically 45 a (t 2 ). by reducing the charging current to approximately 4 a, the slope of the charging function is also substantially reduced, so that th e rotational speed of the motor only slowly increases. the charging current then increases as the voltage across c 3 increases, resulting in a progressively rising charging function which accelerates the motor more and more with increasing rotational speed. the charging function determines the accel- eration up to the set point. the charging current can have a maximum value of 55 a. v c3 t v 12 v 0 t 1 t tot t 2 t 3 t 1 = build-up of supply voltage t 2 = charging of c 3 to starting voltage t 1 + t 2 = dead time t 3 = run-up time t tot = total start-up time to required speed
6 U211B 4752a?indco?10/03 frequency-to-voltage converter the internal frequency-to-voltage converter (f/v converter) generates a dc signal on pin 10 which is proportional to the rotational speed, using an ac signal from a tacho generator or a light beam whose frequency is in turn dependent on the rotational speed. the high-impedance input pin 8 compares the tacho voltage to a switch-on threshold of typically -100 mv. the switch-off threshold is -50 mv. the hysteresis guarantees very reliable operation even when relatively simple tacho generators are used. the tacho frequency is given by: where: n = revolutions per minute p = number of pulses per revolution the converter is based on the charge pumping principle. with each negative half-wave of the input signal, a quantity of charge determined by c 5 is internally amplified and then integrated by c 6 at the converter output on pin 10. the conversion constant is deter- mined by c 5 , its charge transfer voltage of v ch , r 6 (pin 10) and the internally adjusted charge transfer gain. k = g i c 5 r 6 v ch the analog output voltage is given by v o = k f the values of c 5 and c 6 must be such that for the highest possible input frequency, the maximum output voltage v o does not exceed 6 v. while c 5 is charging up, the r i on pin 9 is approximately 6.7 k . to obtain good linearity of the f/v converter, the time con- stant resulting from r i and c 5 should be considerably less (1/5) than the time span of the negative half-cycle for the highest possible input frequency. the amount of remaining ripple on the output voltage on pin 10 is dependent on c 5 , c 6 and the internal charge amplification. the ripple v o can be reduced by using larger values of c 6 . however, the increasing speed will then also be reduced. the value of this capacitor should be chosen to fit the particular control loop where it is going to be used. pulse blocking the output of pulses can be blocked by using pin 18 (standby operation) and the system reset via the voltage monitor if v 18 -1.25 v. after cycling through the switching point hysteresis, the output is released when v 18 -1.5 v, followed by a soft start such as after turn-on. f n 60 ------ p (hz) = g i i 10 i 9 ------ - 8.3 = v o g i v ch c 5 c 6 ---------------------------------- - =
7 U211B 4752a?indco?10/03 monitoring of the rotation can be carried out by connecting an rc network to pin 18. in the event of a short or open circuit, the triac triggering pulses are cut off by the time delay which is determined by r and c. the capacitor c is discharged via an internal resistance r i = 2 k with each charge transfer process of the f/v converter. if there are no more charge transfer processes, c is charged up via r until the switch-off threshold is exceeded and the triac triggering pulses are cut off. for operation without trigger pulse blocking or monitoring of the rotation, pin 18 and pin 16 must be connected together. figure 6. operation delay control amplifier the integrated control amplifier (see figure 24 on page 20) with differential input com- pares the set value (pin 11) with the instantaneous value on pin 10, and generates a regulating voltage on the output pin 12 (together with the external circuitry on pin 12). this pin always tries to keep the actual voltage at the value of the set voltages. the amplifier has a transmittance of typically 1000 a/v and a bipolar current source output on pin 12 which operates with typically 110 a. the amplification and frequency response are determined by r 7 , c 7 , c 8 and r 11 (can be left out). for open-loop opera- tion, c 4 , c 5 , r 6 , r 7 , c 7 , c 8 and r 11 can be omitted. pin 10 should be connected with pin 12 and pin 8 with pin 2. the phase angle of the triggering pulse can be adjusted by using the voltage on pin 11. an internal limitation circuit prevents the voltage on pin 12 from becoming more negative than v 16 +1v. load limitation the load limitation, with standard circuitry, provides full protection against overloading of the motor. the function of load limiting takes account of the fact that motors operating at higher speeds can safely withstand larger power dissipations than at lower speeds due to the increased action of the cooling fan. similarly, considerations have been made for short-term overloads for the motor which are, in practice, often required. these behav- iors are not damaging and can be tolerated. in each positive half-cycle, the circuit measures, via r 10 , the load current on pin 14 as a potential drop across r 8 and produces a current proportional to the voltage on pin 14. this current is available on pin 15 and is integrated by c 9 . if, following high-current amplitudes or a large phase angle for current flow, the voltage on c 9 exceeds an inter- nally set threshold of approximately 7.3 v (reference voltage pin 16), a latch is set and load limiting is turned on. a current source (sink) controlled by the control voltage on pin 15 now draws current from pin 12 and lowers the control voltage on pin 12 so that the phase angle is increased to max . c = 1 f 10 v 18 17 16 15 123 4 r = 1 m
8 U211B 4752a?indco?10/03 the simultaneous reduction of the phase angle during which current flows causes firstly a reduction of the rotational speed of the motor which can even drop to zero if the angu- lar momentum of the motor is excessively large, and secondly a reduction of the potential on c 9 which in turn reduces the influence of the current sink on pin 12. the control voltage can then increase again and bring down the phase angle. this cycle of action sets up a ?balanced c ondition? between the ?current integral? on pin 15 and the control voltage on pin 12. apart from the amplitude of the load current and the time during which current flows, the potential on pin 12 and hence the rotational speed also affects the function of load limit- ing. a current proportional to the potential on pin 10 gives rise to a voltage drop across r 10 , via pin 14, so that the current measured on pin 14 is smaller than the actual current through r 8 . this means that higher rotational speeds and higher current amplitudes lead to the same current integral. therefore, at higher speeds, the power dissipation must be greater than that at lower speeds before the internal threshold voltage on pin 15 is exceeded. the effect of speed on the maximum power is determined by the resistor r 10 and can therefore be adjusted to suit each individual application. if, after load limiting has been turned on, the momentum of the load sinks below the ?o- momentum? set using r 10 , v 15 will be reduced. v 12 can then increase again so that the phase angle is reduced. a smaller phase angel corresponds to a larger momentum of the motor and hence the motor runs up, as long as this is allowed by the load momen- tum. for an already rotating machine, the effect of rotation on the measured ?current integral? ensures that the power dissipation is able to increase with the rotational speed. the result is a current-controlled acceleration run-up which ends in a small peak of acceleration when the set point is reached. the load limiting latch is simultaneously reset. then the speed of the motor is under control again and is capable of carrying its full load. the above mentioned peak of acceleration depends upon the ripple of actual speed voltage. a large amount of ripple also leads to a large peak of acceleration. the measuring resistor r 8 should have a value which ensures that the amplitude of the voltage across it does not exceed 600 mv. design hints practical trials are normally needed for the exact determination of the values of the rele- vant components for load limiting. to make this evaluation easier, the following table shows the effect of the circuitry on the important parameters for load limiting and sum- marizes the general tendencies. table 1. load limiting parameters p max - maximum continuous power dissipation p 1 = f (n) n 0 p min - power dissipation with no rotation p 1 = f (n) n = 0 t d - operation delay time t r - recovery time n.e. - no effect parameters component component component r 10 increasing r 9 increasing c 9 increasing p max increases decreases n.e. p min increases decreases n.e. p max/min increases n.e. n.e. t d n.e. increases increases t r n.e. increases increases
9 U211B 4752a?indco?10/03 pulse-output stage the pulse-output stage is short-circuit protected and can typically deliver currents of 125 ma. for the design of smaller triggering currents, the function i gt = f(r gt ) can be taken from figure 19 on page 17. automatic retriggering the variable automatic retriggering prevents half cycles without current flow, even if the triac has been turned off earlier, e.g., due to a collector which is not exactly centered (brush lifter) or in the event of unsuccess ful triggering. if necessary, another triggering pulse is generated after a time lapse which is determined by the repetition rate set by resistance between pin 5 and pin 3 (r 5-3 ). with the maximum repetition rate (pin 5 directly connected to pin 3), the next attempt to trigger comes after a pause of 4.5 t p and this is repeated until either the triac fires or the half cycle finishes. if pin 5 is not con- nected, only one trigger pulse per half cycle is generated. since the value of r 5-3 determines the charging current of c 2 , any repetition rate set using r 5-3 is only valid for a fixed value of c 2 . general hints and explanation of terms to ensure safe and trouble-free operation, the following points should be taken into con- sideration when circuits are being constructed or in the design of printed circuit boards. the connecting lines from c 2 to pin 7 and pin 2 should be as short as possible. the connection to pin 2 should not carry any additional high current such as the load current. when selecting c 2 , a low temperature coefficient is desirable. the common (earth) connections of the set-point generator, the tacho generator and the final interference suppression capacitor c 4 of the f/v converter should not carry load current. the tacho generator should be mounted without influence by strong stray fields from the motor. the connections from r 10 and c 5 should be as short as possible. to achieve a high noise immunity, a maximum ramp voltage of 6 v should be used. the typical resistance r can be calculated from i as follows: t = period duration for mains frequency (10 ms at 50 hz) c = ramp capacitor, maximum ramp voltage 6 v and constant voltage drop at r = 1.13 v a 10% lower value of r (under worst case conditions) is recommended. r k
tms
1.13 v
10 3 cnf
6v
----------------------------------------------------------- =
10 U211B 4752a?indco?10/03 figure 7. explanation of terms in phase relationship design calculations for main supply the following equations can be used for the evaluation of the series resistor r 1 for worst case conditions: where: v m = mains voltage v s = supply voltage on pin 3 i tot = total dc current requirement of the circuit = i s + i p + i x i smax = current requirement of the ic in ma i p = average current requirement of the triggering pulse i x = current requirement of other peripheral components r 1 can be easily evaluated from the figure 21 on page 18, figure 22 on page 18 and figure 23 on page 19. v v gt v l i l /2 3/2 2 t p t pp = 4.5 t p mains supply trigger pulse load voltage load current r 1max 0.85 v mmin v smax ? 2 i tot -------------------------------------- = r 1min v m v smin ? 2 i smax ---------------------------- - = p r1max v mmax v smin ?
2 2 r 1 --------------------------------------------- - =
11 U211B 4752a?indco?10/03 absolute maximum ratings reference point pin 2, unless otherwise specified 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 . parameters pins symbol value unit current requirement 3 -i s 30 ma t 10 s 3 -i s 100 ma synchronization current 1 i synci 5ma 17 i syncv 5ma t < 10 s 1 i i 35 ma t < 10 s 17 i i 35 ma f/v converter input current 8 i i 3ma t < 10 s 8 i i 13 ma load limiting limiting current, negative half wave 14 i i 5ma t < 10 s 14 i i 35 ma input voltage 14 v i 1v 15 -v i |v 16 | to 0 v phase control input voltage 12 -v i 0 to 7 v input current 12 i i 500 a 6-i i 1ma soft start input voltage 13 -v i |v 16 | to 0 v pulse output reverse voltage 4 v r v s to 5 v pulse blocking input voltage 18 -v i |v 16 | to 0 v amplifier input voltage 11 v i 0 to v s v pin 9 open 10 -v i |v 16 | to 0 v reference voltage source output current 16 i o 7.5 ma storage temperature range t stg -40 to +125 c junction temperature t j 125 c ambient temperature range t amb -10 to +100 c
12 U211B 4752a?indco?10/03 thermal resistance parameters symbol value unit junction ambient dip18 so16 on p.c. so16 on ceramic r thja r thja r thja 120 180 100 k/w k/w k/w electrical characteristics -v s = 13.0 v, t amb = 25 c, reference point pin 2, unless otherwise specified parameters test conditions pins symbol min. typ. max. unit supply voltage for mains operation 3 -v s 13.0 v limit v supply voltage limitation -i s = 4 ma -i s = 30 ma 3-v s 14.6 14.7 16.6 16.8 v v dc current requirement -v s = 13.0 v 3 i s 1.2 2.5 3.0 ma reference voltage source -i l = 10 a -i l = 5 ma 16 -v ref 8.6 8.3 8.9 9.2 9.1 v v temperature coefficient 16 -tc vref 0.5 mv/k voltage monitoring turn-on threshold 3 -v son 11.2 13.0 v turn-off threshold 3 -v soff 9.9 10.9 v phase-control currents synchronization current 1 17 i synci i syncv 0.35 2.0 ma voltage limitation i l = 5 ma 1, 17 v i 1.4 1.6 1.8 v reference ramp (see figure 8 on page 14) charge current i 7 = f(r 6 ) r 6 = 50 k to 1 m 7i 7 120 a r -reference voltage 180 6, 3 v ref 1.06 1.13 1.18 v temperature coefficient 6 tc v ref 0.5 mv/k pulse output (see figure 19 on page 17, pin 4) output pulse current r gt = 0, v gt = 1.2 v i o 100 155 190 ma reverse current i or 0.01 3.0 a output pulse width c = 10 nf t p 80 s amplifier common-mode signal range 10, 11 v 10 , v 11 v 16 -1 v input bias current 11 i io 0.01 1 a input offset voltage 10, 11 v 10 10 mv output current 12 -i o +i o 75 88 110 120 145 165 a a short circuit forward, transmittance i 12 = f(v 10-11 ), (see figure 14 on page 16) 12 y f 1000 a/v
13 U211B 4752a?indco?10/03 pulse blocking, tacho monitoring logic-on 18 -v ton 3.7 1.5 v logic-off 18 -v toff 1.25 1.0 v input current v 18 = v toff = 1.25 v v 18 = v 16 18 i i 14.5 0.3 1 a a output resistance 18 r o 1.5 6 10 k frequency-to-voltage converter input bias current 8 i ib 0.6 2 a input voltage limitation i i = -1 ma i i = +1 ma (see figure 14 on page 16) 8 -v i +v i 660 7.25 750 8.05 mv v turn-on threshold 8 -v ton 100 150 mv turn-off threshold 8 -v toff 20 50 mv charge amplifier discharge current c 5 = 1 nf, (see figure 24 on page 20) 9i dis 0.5 ma charge transfer voltage 9 to 16 v ch 6.50 6.70 6.90 v charge transfer gain i 10 /i 9 9, 10 g i 7.5 8.3 9.0 conversion factor c 5 = 1 nf, r 6 = 100 k (see figure 24 on page 20) k 5.5 mv/hz output operating range 10 to 16 v o 0-6 v linearity 1 % soft start, f/v converter non-active (see figure 9 on page 14 and figure 11 on page 15) starting current v 13 = v 16 , v 8 = v 2 13 i o 20 45 55 a final current v 13 = 0.5 13 i o 50 85 130 a f/v converter active (see figure 10 on page 14, figure 12 on page 15 and figure 13 on page 15) starting current v 13 = v 16 13 i o 247a final current v 13 = 0.5 i o 30 55 80 a discharge current restart pulse 13 i o 0.5 3 10 ma automatic retriggering (see figure 20 on page 18, pin 5) repetition rate r 5-3 = 0 t pp 34.56 t p r 5-3 = 15 k t pp 20 t p load limiting (see figure 16 on page 16, figure 17 on page 17 and figure 18 on page 17) operating voltage range 14 v i -1.0 +1.0 v offset current v 10 = v 16 v 14 = v 2 via 1 k 14 15-16 i o i o 5 0.1 12 1.0 a a input current v 10 = 4.5 v 14 i i 60 90 120 a output current v 14 = 300 mv 15-16 i o 110 140 a overload on 15-16 v ton 7.05 7.4 7.7 v electrical characteristics (continued) -v s = 13.0 v, t amb = 25 c, reference point pin 2, unless otherwise specified parameters test conditions pins symbol min. typ. max. unit
14 U211B 4752a?indco?10/03 figure 8. ramp control figure 9. soft-start charge current (f/v converter non-active) figure 10. soft-start charge current (f/v converter active) 0 0.2 0.4 0.6 0.8 0 80 120 160 200 240 p h a s e a n g l e ( ) r (m ) 1.0 10nf 4.7nf reference point pin 2 2.2nf /t c /t =1.5nf 02 4 6 8 0 20 40 60 80 100 i 1 3 ( a ) v 13 (v) 10 reference point pin 16 02 4 6 8 0 20 40 60 80 100 i 1 3 ( a ) v 13 (v) 10 reference point pin 16
15 U211B 4752a?indco?10/03 figure 11. soft-start voltage (f/v converter non-active) figure 12. soft-start voltage (f/v converter active) figure 13. soft-start function 0 2 4 6 8 10 v 1 3 ( v ) t = f (c3) reference point pin 16 0 2 4 6 8 10 v 1 3 ( v ) t = f (c3) reference point pin 16 0 2 4 6 8 10 reference point pin 16 motor in action motor standstill (dead time) t = f (c3) v 1 3 ( v )
16 U211B 4752a?indco?10/03 figure 14. f/v converter voltage limitation figure 15. amplifier output characteristics figure 16. load limit control -10 -8 -6 -4 -2 -500 -250 0 250 500 i 8 ( a ) v 8 (v) 4 02 reference point pin 2 -300 -200 -100 0 200 -100 -50 0 50 100 i 1 2 ( a ) v 10-11 (v) 300 100 reference point for i 12 = -4 v 024 6 0 50 100 150 200 - i 1 2 - 1 6 ( a ) v 15-16 (v) 8
17 U211B 4752a?indco?10/03 figure 17. load limit control f/v dependency figure 18. load current detection figure 19. pulse output 024 6 0 50 100 150 200 i 1 4 - 2 ( a ) v 10-16 (v) 8 0 100 200 300 400 0 50 100 150 200 250 700 500 600 i 1 5 - 1 6 ( a ) v 14-2 (mv) i 15 = f(v shunt ) v 10 = v 16 0 200 400 600 800 0 20 40 60 80 100 r gt ( ) 1000 v gt = 0.8 v 1.4 v i gt (ma)
18 U211B 4752a?indco?10/03 figure 20. automatic retriggering repetition rate figure 21. determination of r 1 figure 22. power dissipation of r 1 0 6 12 18 24 0 5 10 15 20 r 5 - 3 ( k ) t pp /t p 30 04812 0 10 20 30 40 50 r 1 ( k ) i tot (ma) 16 mains supply 230 v 0 102030 r 1 (k ) 40 mains supply 230 v 0 1 2 3 4 6 p ( r 1 ) ( w ) 5
19 U211B 4752a?indco?10/03 figure 23. power dissipation of r 1 according to current consumption 03 6 9 12 0 1 2 3 4 6 p ( r 1 ) ( w ) i tot (ma) 15 mains supply 230 v 5
20 U211B 4752a?indco?10/03 figure 24. speed control, automatic retriggering, load limiting, soft start r 3 220 k r 4 470 k r 2 -v s 3.3 nf 1 m gnd c 1 22 f/ 25 v c 11 2.2 f r 12 180 m r 1 18 k 1n4007 d 1 2 w tic 226 r 8 33 m 1 w r 11 2 m 100 k r 6 c 6 100 nf 10 f/16v c 7 c 8 220 nf 22 k r 7 c 3 2.2 f/ 16 v c 5 1 nf r 5 1 k speed sensor c 4 220 nf l n 1 k r 10 r 9 1 m 4.7 f/16v c 9 r 19 100 k c 10 2.2 f/16v r 31 100 k r 14 56 k r 13 47 k v m = 230 v ~ control amplifier load limitation speed/time controlled voltage monitoring supply voltage limitation reference voltage output pulse pulse blocking tacho monitoring frequency- to-voltage converter phase- control unit = f (v 12 ) soft start 15 14 11 10 12 13 9 8 7 3 2 16 18 voltage/current detector automatic retriggering 17 1 6 4 5 + - c 2 set speed voltage actual speed voltage controlled current sink -v ref
21 U211B 4752a?indco?10/03 figure 25. speed control, automatic retriggering, load switch-off, soft start the switch-off level at maximum load shows in principle the same speed dependency as the original version (see figure 24 on page 20), but when reaching the maximum load, the motor is switched off completely. this function is effected by the thyristor (formed by t 1 and t 2 ) which ignites when the voltage at pin 15 reaches typically 7.4 v (reference point pin 16). the circuit is thereby switched to standby mode over the release pin 18. 1 8 1 7 1 6 1 5 1 2 3 4 1 4 1 3 1 2 5 6 7 1 1 8 1 0 9 r 3 m r 1 1 8 k d 1 2 2 0 k 4 7 0 k r 4 1 . 5 w 1 n 4 0 0 4 1 8 0 r 1 2 2 2 f 2 5 v c 1 r 8 = 3 x 1 1 m r 1 0 2 . 2 k 2 3 0 v ~ 6 8 0 p f c 5 r 2 1 m c 2 2 . 2 n f 1 k r 5 2 2 0 n f c 4 s p e e d s e n s o r r 7 1 5 k c 7 r 1 3 4 7 k 1 m r 1 1 c 6 1 0 0 n f r 6 1 0 0 k 2 2 0 n f c 8 2 . 2 f 1 0 v c 3 2 . 2 f 1 0 v c 1 0 2 5 0 k r 3 1 4 . 7 f 1 0 v c 9 4 7 0 k r 9 g n d - v s 1 w r 1 5 4 7 k r 1 6 4 7 k 1 0 k r 1 4 b z x 5 5 s e t s p e e d v o l t a g e l n t1 t 2 2 . 2 / 1 0 v r c / t f c 1 1 2 . 2 f u 2 1 1 b
22 U211B 4752a?indco?10/03 figure 26. speed control, automatic retriggering, load switch-down, soft start the maximum load regulation shows in principle the same speed dependency as the original version (see figure 24 on page 20). when reaching the maximum load, the con- trol unit is turned to max , adjustable with r 2 . then, only i o flows. this function is effected by the thyristor, formed by t 1 and t 2 which ignites as soon as the voltage at pin 15 reaches approximately 6.8 v (referenc e point pin 16). the potential at pin 15 is lifted and kept by r 14 over the internal operating threshold whereby the maximum load regulation starts and adjusts the control unit constantly to max (i o ), inspite of a reduced load current. the motor shows that the circ uit is still in operation by produceing a buzzing sound. 1 8 1 7 1 6 1 5 1 2 3 4 1 4 1 3 1 2 5 6 7 1 1 8 1 0 9 r 3 m r 1 1 8 k d 1 2 2 0 k 4 7 0 k r 4 1 . 5 w 1 n 4 0 0 4 1 8 0 r 1 2 2 2 f 2 5 v c 1 r 8 = 3 x 1 1 m r 1 0 2 . 2 k 2 3 0 v ~ 6 8 0 p f c 5 r 2 1 m c 2 2 . 2 n f 1 k r 5 2 2 0 n f c 4 s p e e d s e n s o r r 7 1 5 k 2 . 2 f/ 1 0 v c 7 r 1 3 4 7 k 1 m r 1 1 c 6 1 0 0 n f r 6 1 0 0 k 2 2 0 n f c 8 2 . 2 f 1 0 v c 3 2 . 2 f 1 0 v c 1 0 2 5 0 k r 3 1 4 . 7 f 1 0 v 4 7 0 k r 9 g n d - v s 1 w r 1 6 4 7 k r 1 5 3 3 k 1 0 k r 1 4 b z x 5 5 s e t s p e e d v o l t a g e l t 1 t 2 r c / t n c 9 c 1 1 2 . 2 f u 2 1 1 b
23 U211B 4752a?indco?10/03 figure 27. speed control, automatic retriggering, load limiting, soft start, tacho control 1 8 1 7 1 6 1 5 1 2 3 4 1 4 1 3 1 2 5 6 7 1 1 8 1 0 9 r 3 m r 1 1 8 k d 1 2 2 0 k w c 1 1 4 7 0 k w r 4 1 . 5 w 1 n 4 0 0 4 2 2 0 r 1 2 2 2 f 2 5 v c 1 r 8 = 3 x 1 1 m r 1 0 1 k 2 3 0 v ~ 1 n f c 5 r 2 1 m c 2 2 . 2 n f 1 k r 5 2 2 0 n f c 4 s p e e d s e n s o r r 7 2 2 k c 7 r 1 3 4 7 k 1 . 5 m r 1 1 c 6 1 0 0 n f r 6 6 8 k 2 2 0 n f c 8 2 . 2 f 1 0 v c 3 2 . 2 f 1 0 v c 1 0 2 5 0 k r 3 1 4 . 7 f c 9 1 m r 9 g n d - v s 1 w s e t s p e e d v o l t a g e l n 1 / m f 1 0 v 1 m w 2 . 2 / f 1 0 v r c / t 2 2 n f u 2 1 1 b
24 U211B 4752a?indco?10/03 figure 28. speed control with reflective opto coupler cny70 as emitter 1 8 1 7 1 6 1 5 1 2 3 4 1 4 1 3 1 2 5 6 7 1 1 8 1 0 9 2 2 n f r 4 m r 1 1 8 k d 1 2 2 0 k c 1 1 4 7 0 k r 5 1 . 5 w 1 n 4 0 0 4 1 0 0 w r 6 4 7 2 5 v c 1 2 3 0 v ~ 6 8 0 p f c 6 r 2 1 m c 2 3 . 3 n f c 8 r 7 4 7 0 k 2 2 0 n f c 4 2 . 2 1 0 v c 3 4 . 7 1 0 v c 1 3 1 0 0 k r 3 1 g n d - v s 1 0 1 0 v r c / t r 1 1 c 7 1 6 k 4 7 0 n f s e t s p e e d m i n . r 1 8 s e t s p e e d m a x . r 1 3 4 7 k r 8 4 . 7 k r 3 r 9 2 2 0 k r 1 0 1 . 5 k 1 0 0 1 0 v c 1 0 c 5 4 7 0 n f c n y 7 0 r 1 7 r 1 6 1 0 0 4 7 0 z 3 b z x 5 5 c 9 v 1 3 . 5 k / 8 w r 1 5 1 n 4 0 0 4 d 2 i g t = 5 0 m a l 1 l 2 r 1 4 1 0 0 1 5 0 n f 2 5 0 v ~ c 1 2 c a . 2 2 0 p u l s e s / r e v o l u t i o n a l l d i o d e s b y w 8 3 f f f f f u 2 1 1 b
25 U211B 4752a?indco?10/03 figure 29. speed control, maximum load control with reflective opto coupler cny70 as emitter 1 8 1 7 1 6 1 5 1 2 3 4 1 4 1 3 1 2 5 6 7 1 1 8 1 0 9 2 2 n f r 3 m r 1 1 0 k d 1 1 1 0 k c 1 1 2 2 0 k r 4 1 . 1 w 1 n 4 0 0 4 1 0 0 r 1 2 2 2 2 5 v c 1 2 3 0 v ~ c 5 r 2 1 m c 2 3 . 3 n f c 7 r 1 1 8 2 0 k 4 7 0 n f c 6 2 . 2 1 0 v c 3 4 7 1 0 v c 1 0 2 2 0 k r 3 1 g n d - v s 1 0 r c / t r 7 c 8 1 6 k 4 7 0 n f s e t s p e e d m i n . r 1 4 s e t s p e e d m a x . r 1 3 8 2 k r 6 r 5 2 . 2 k c n y 7 0 r 1 7 r 1 8 3 3 k 4 7 0 i g t = 5 0 m a 1 0 0 1 5 0 n f 2 5 0 v ~ c 1 2 6 8 0 p f r 1 6 1 0 k c 4 1 n f 9 v 4 . 7 1 0 v c 9 r 9 2 2 0 k r 8 = 3 x 0 . 1 r 1 0 1 . 1 k c 1 3 1 f f f f f f u 2 1 1 b
26 U211B 4752a?indco?10/03 the schematic diagram (see figure 29 on page 25) is designed as a speed control ic based on the reflection-coupled principle with 4 periods per revolution and a maximum speed of 30000 rpm. the separation of the coupler from the rotating aperture should be about approximately 1 mm. in the schematic diagram, the power supply for the coupler was provided externally because of the relatively high current consumption. instructions for adjusting: 1. in the initial adjustment of the phase-control circuit, r 2 should be adjusted so that when r 14 = 0 and r 31 are in minimum position, the motor just turns. 2. the speed can now be adjusted as desired by means of r 31 between the limits determined by r 13 and r 14 . 3. the switch-off power of the limiting-load control can be set by r 9 . the lower r 9 , the higher the switch-off power.
27 U211B 4752a?indco?10/03 package information ordering information extended type number package remarks U211B-x dip18 tube U211B-xfp so16 tube U211B-xfpg3 so16 taped and reeled package dip18 dimensions in mm 0.5 min technical drawings according to din specifications 7.77 7.47 23.3 max 4.8 max 3.3 6.4 max 0.36 max 9.8 8.2 1.64 1.44 0.58 0.48 2.54 20.32 18 10 19 technical drawings according to din specifications package so16 dimensions in mm 10.0 9.85 8.89 0.4 1.27 1.4 0.25 0.10 5.2 4.8 3.7 3.8 6.15 5.85 0.2 16 9 18
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