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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 retrigge ring switchable ? triggering pulse typically 155 ma ? voltage and current synchronization ? internal supply-v oltage monitoring ? temperature reference source ? current requirement 3ma 1. 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 1-1. block diagram volt a ge/c u rrent detector control a mplifier a u tom a tic retriggering o u tp u t p u l s e lo a d limit a tion s peed/time controlled controlled c u rrent s ink pin n u m b er s in b r a cket s refer to s o16 * pin s 5 a nd 1 8 connected intern a lly fre qu ency to volt a ge converter p u l s e b locking t a cho monitoring su pply volt a ge limit a tion reference volt a ge volt a ge monitoring s oft s t a rt pha s e- control unit ? = f (v 12 ) - + 17(16) 11(10) 4(4) 6(5) 7(6) 3 ( 3 ) 10(9) 14(1 3 ) 15(14) 12(11) 1 3 (12) 9( 8 ) 8 (7) -v ref -v s 2(2) 16(15) 1 8 * gnd 1(1) 5 * product description u211b 4752b?indco?09/05
2 4752b?indco?09/05 u211b 2. pin configuration figure 2-1. pinning dip18 retr o u tp u t u211b f/v i s ync v s v rp c p c rv gnd ctr/opo op+ op v s ync i s en s e v ref c s oft pb/tm ovl 5 6 9 7 8 1 2 3 4 12 1 3 14 15 16 1 8 17 11 10 table 2-1. 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 4752b?indco?09/05 u211b figure 2-2. pinning so16 o u tp u t u211b f/v i s ync v s v rp c p c rv gnd ctr/opo op+ op v s ync i s en s e v ref c s oft ovl 5 6 7 8 1 2 3 4 10 11 12 1 3 14 16 15 9 table 2-2. 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 4752b?indco?09/05 u211b 3. 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 9 . the reference voltage source on pin 16 of typically ?8.9v is derived from the supply voltage and is used for regulation. operation using an externally stabiliz ed dc voltage is not recommended. if the supply cannot be taken directly from the mains because the pow er dissipation in r 1 would be too large, the circuit as shown in figure 3-1 should be used. figure 3-1. supply voltage for high current requirements 4. 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 trigger 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 automatic retriggering has not been activated, no more pulses can be gen- erated in that half cycle. the current sensor on pin 1 en sures that, for operations with inductive loads, no pulse will be generated in a new half cycle as long as a current from the previo us 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 0v to ?7v (reference point pin 2). if v 12 = ?7v, 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 --------------------- = + 12 r1 24v ~ ~ c1 3 4 5
5 4752b?indco?09/05 u211b 5. voltage monitoring as the voltage is built up, uncontrolled output pulses are avoided by internal voltage surveil- lance. at the same time, all latche s 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 guar antees defined start-up behavior each time the supply voltage is switched on or after short interruptions of the mains supply. 6. soft start as soon as the supply voltage builds up (t 1 ), the integrated soft start is initiated. figure 6-1 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 6-1. 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 substan- tially reduced, so that the rotational speed of the motor only slowly increases. the charging current then incr eases 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 acceleration up to the set point. the charging current can have a maximum value of 55 a. v c 3 t 1 t 1 = b u ild- u p of su pply volt a ge t 2 = ch a rging of c 3 to s t a rting volt a ge t 1 + t 2 de a d time t 3 = r u n- u p time t tot = tot a l s t a rt- u p time to re qu ired s peed t 2 t 3 t tot t v 12 v 0
6 4752b?indco?09/05 u211b 7. 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 hysteres is 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 pr inciple. 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 determined 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 maxi- mum output voltage v o does not exceed 6v. 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 constant 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. f n 60 ------ p (hz) = g i i 10 i 9 ------ - 8.3 = v o g i v ch c 5 c 6 ------------------------------------ - =
7 4752b?indco?09/05 u211b 7.1 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 ?1.25v. after cycling through the switching point hysteresis, the output is released when v 18 ?1.5v, followed by a soft start such as after turn-on. 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 trigge ring 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 pro- cesses, 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 7-1. operation delay 7.2 control amplifier the integrated control amplifier (see figure 10-17 on page 21 ) with differential input compares the set value (pin 11) with the instantaneous value on pin 10, and generates a regulating volt- age 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 operation, 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. 7.3 load limitation the load limitation, with standard circuitry, provides full protection against overloading of the motor. the function of load limiting takes acco unt 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 behaviors are not damag- ing and can be tolerated. + 12 c = 1 f 10v r = 1 m 3 4 1 8 17 16 15
8 4752b?indco?09/05 u211b in each positive half-cycle, the circuit measures, via r 10 , the load current on pin 14 as a poten- tial 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 internally set threshold of approxi- mately 7.3v (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 . 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 angular 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. th is cycle of action sets up a ?balanced con- dition? 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 al so affects the function of load limiting. 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 cur- rent 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 momentum. 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-con- trolled 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 accelera- tion 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 volt- age across it does not exceed 600 mv.
9 4752b?indco?09/05 u211b 7.4 design hints practical trials are normally needed for the exact determination of the values of the relevant 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 summarizes the general tendencies. table 7-1. load limiting parameters p max - maximum continuous power dissipationp 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 7.5 pulse-output stage the pulse-output stage is short-circuit protect ed 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 10-12 on page 18 . 7.6 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 unsuccessful 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 connected, only one trig ger pulse per half cycle is gener- ated. 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 . 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
10 4752b?indco?09/05 u211b 7.7 general hints and explanation of terms to ensure safe and trouble-free operation, the following points should be taken into consider- ation 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 addition al 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 6v 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. figure 7-2. explanation of terms in phase relationship r ? k () tms () 1.13 v () 10 3 cnf () 6v () ------------------------------------------------------------- = t pp = 4.5 t p t p /2 3 /2 2 v m a in s su pply trigger p u l s e lo a d volt a ge v gt v l ? lo a d c u rrent l
11 4752b?indco?09/05 u211b 7.8 design calculati ons 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 10-14 on page 19 , figure 10-15 on page 19 and figure 10-16 on page 20 . 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 --------------------------------------------- - =
12 4752b?indco?09/05 u211b 8. 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 t hose indicated in the operational sections of this specification is not implied. exposure to absolute maximum rati ng 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
13 4752b?indco?09/05 u211b 9. 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 10. electrical characteristics ? v s = 13.0v, t amb = 25c, 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 10-1 on page 15 ) 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 10-12 on page 18 , 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 10-7 on page 17 ) 12 y f 1000 a/v
14 4752b?indco?09/05 u211b 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-vol tage converter input bias current 8 i ib 0.6 2 a input voltage limitation i i = ?1 ma i i = +1 ma (see figure 10-7 on page 17 ) 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 10-17 on page 21 ) 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 10-17 on page 21 ) 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 10-2 on page 15 and figure 10-4 on page 16 ) 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 10-3 on page 15 , figure 10-5 on page 16 and figure 10-6 on page 16 ) 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 10-13 on page 19 , 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 10-9 on page 17 , figure 10-10 on page 18 and figure 10-11 on page 18 ) 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 = 4.5v 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 10. electrical characteristics (continued) ? v s = 13.0v, t amb = 25c, reference point pin 2, unless otherwise specified parameters test conditions pins symbol min. typ. max. unit
15 4752b?indco?09/05 u211b figure 10-1. ramp control figure 10-2. soft-start charge current (f/v converter non-active) figure 10-3. soft-start charge current (f/v converter active) 240 0 0.2 0.4 0.6 0. 8 1.0 pha s e an g le ( ) reference point pin 2 10 nf 4.7 nf /t 2.2 nf 200 160 120 8 0 0 c ? t = 1.5 nf r ? t (m ) 0246 8 10 100 i 1 3 (a) v 1 3 (v) 8 0 60 40 20 0 reference point pin 16 02 4 6 8 0 20 40 60 8 0 100 10 reference point pin 16 v 1 3 (v) i 1 3 (a)
16 4752b?indco?09/05 u211b figure 10-4. soft-start voltage (f/v converter non-active) figure 10-5. soft-start voltage (f/v converter active) figure 10-6. soft-start function 10 v 1 3 (v) t = f (c 3 ) 8 6 4 2 0 reference point pin 16 t = f (c 3 ) 10 v 1 3 (v) 8 6 4 2 0 reference point pin 16 t = f (c 3 ) 10 v 1 3 (v) 8 6 4 2 0 reference point pin 16 motor in action motor s t a nd s till (de a d time)
17 4752b?indco?09/05 u211b figure 10-7. f/v converter voltage limitation figure 10-8. amplifier output characteristics figure 10-9. load limit control -10 - 8 -6 -4 -2 0 2 4 v 8 (v) 500 i 8 (a) 250 0 -250 -500 reference point pin 2 - 3 00 -200 -100 0 100 200 3 00 v 10-11 (v) 100 i 12 (a) 50 0 -50 -100 reference point for i 12 = -4v 024 6 8 v 15-16 (v) 200 -i 12-16 (a) 150 100 50 0
18 4752b?indco?09/05 u211b figure 10-10. load limit control f/v dependency figure 10-11. load current detection figure 10-12. pulse output 024 6 8 v 10-16 (v) 200 -i 14-2 (a) 150 100 50 0 0 100 200 3 00 400 500 600 700 v 14-2 (mv) 250 i 15-16 (a) 200 150 0 100 50 i 15 = f (v s h u nt ) v 10 = v 16 0 200 400 600 8 00 1000 100 i gt (ma) 8 0 60 0 40 20 v gt = 0. 8 v 1.4v r gt ( )
19 4752b?indco?09/05 u211b figure 10-13. automatic retriggeri ng repetition rate figure 10-14. determination of r 1 figure 10-15. power dissipation of r 1 20 15 0 10 5 06121 8 24 3 0 t pp /t p r 5- 3 (k ) 06121 8 24 t tot (ma) 40 50 3 0 0 20 10 r 1 (k ) m a in s su pply 2 3 0v 01020 3 040 p (r1) (w) 4 5 6 3 0 2 1 r 1 (k ) m a in s su pply 2 3 0v
20 4752b?indco?09/05 u211b figure 10-16. power dissipation of r 1 according to current consumption p (r1) (w) 4 5 6 3 0 2 1 0 3 6 9 12 15 i tot (ma) m a in s su pply 2 3 0v
21 4752b?indco?09/05 u211b figure 10-17. speed control, automatic retriggering, load limiting, soft start volt a ge/c u rrent detector control a mplifier s et s peed volt a ge a u tom a tic retriggering o u tp u t p u l s e lo a d limit a tion s peed/time controlled controlled c u rrent s ink fre qu ency to volt a ge converter p u l s e b locking t a cho monitoring su pply volt a ge limit a tion reference volt a ge volt a ge monitoring s oft s t a rt act ua l s peed volt a ge pha s e- control unit ? = f (v 12 ) - + + + + + + + 17 11 4 6 7 3 10 14 15 12 1 3 9 8 r 3 220 k r19 100 k r6 100 k r10 1 k r9 1 m r9 1 m r5 1 k r2 1 m c10 c6 c7 -v ref -v s 2 16 1 8 gnd tic 226 2.2 f/16v 10 f/16v c5 c4 1 nf 2.2 f/16v c 8 c 3 220 nf s peed s en s or 220 nf 22 f/ 25v 22 f c2 v m = 2 3 0v ~ c1 c11 3 . 3 nf c9 4.7 f/16v 100 nf r4 470 k 1 5 r7 22 k r14 56 k r 3 1 100 k r1 3 47 k r 8 33 m 1w r1 1 8 k 2w d1 1n4007 r12 1 8 0 m l n
22 4752b?indco?09/05 u211b figure 10-18. 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 10-17 on page 21 ), 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 r eaches typically 7.4v (reference point pin 16). the circuit is thereby switched to standby mode over the release pin 18. + + + + + d1 1n4004 100 nf s et s peed volt a ge s peed s en s or r1 1 8 k 1.5w r7 15 k 1 m r11 1 m r10 2.2 k r9 470 k r14 10 k r15 47 k r6 100 k r 3 1 250 k r1 3 47 k r5 1 k r 8 = 3 x 11 m / 1w 220 k r 3 c7 gnd -v s 2 3 0v ~ 47 k r16 470 k r4 1 8 0 r12 r ? r2 c ? t 22 f 25v 2.2 nf u211b 12 n l c1 4.7 f 10v 2.2 f 10v c9 + 2.2 f 10v c10 c 3 c6 c 8 c2 c5 220 nf 6 8 0 pf c4 2.2 f 2.2 f/10v 220 nf c11 3 4567 8 9 1 8 17 16 15 14 1 3 12 11 10 m t2 t1 bzx55
23 4752b?indco?09/05 u211b figure 10-19. 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 10-17 on page 21 ). when reaching the maximum load, the control 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 6.8v (reference 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 circuit is still in operation by produceing a buzzing sound. + + + + + d1 1n4004 100 nf s et s peed volt a ge s peed s en s or r1 1 8 k 1.5w r7 15 k 1 m r11 1 m r10 2.2 k r9 470 k r14 10 k r6 100 k r 3 1 250 k r1 3 47 k r5 1 k r 8 = 3 x 11 m / 1w 220 k r 3 c7 gnd -v s 2 3 0v ~ 33 k r15 47 k r16 470 k r4 1 8 0 r12 r ? r2 c ? t 22 f 25v 2.2 nf u211b 12 n l c1 4.7 f 10v 2.2 f 10v c9 + 2.2 f 10v c10 c 3 c6 c 8 c2 c5 220 nf 6 8 0 pf c4 2.2 f 2.2 f/10v 220 nf c11 3 4567 8 9 1 8 17 16 15 14 1 3 12 11 10 m t2 t1 bzx55
24 4752b?indco?09/05 u211b figure 10-20. speed control, automatic retriggering, load limiting, soft start, tacho control + + + + + d1 1n4004 100 nf s et s peed volt a ge s peed s en s or r1 1 8 k 1.5w r7 22 k 1 m r11 1.5 m r10 1 k 1 m r6 6 8 k r 3 1 250 k r1 3 47 k r5 1 k r 8 = 3 x 11 m / 1w 220 k r 3 c7 gnd -v s 2 3 0v ~ 1 m 470 k r4 220 r12 r ? r2 c ? t 22 f 25v 2.2 nf u211b 12 n l c1 4.7 f 2.2 f 10v c9 + 2.2 f 10v c10 c 3 c6 c 8 c2 c5 220 nf 1 nf c4 22 nf 2.2 f/10v 1 f/10v 220 nf c11 3 4567 8 9 1 8 17 16 15 14 1 3 12 11 10 m r9
25 4752b?indco?09/05 u211b figure 10-21. speed control with reflective op to coupler cny70 as emitter + + + d1 1n4004 s et s peed m a x. r1 1 8 k 1.5w r11 16 k 1 m r 3 1 100 k r1 3 s et s peed min. r1 8 r7 470 k r 8 47 k r9 220 k r10 1.5 k r16 470 r17 100 220 k r4 l1 l2 c 8 c5 z 3 c7 gnd -v s 2 3 0v ~ 470 k 4.7 k r5 100 r14 3 .5 k / 8 w 1n4004 c a . 220 p u l s e s /revol u tion a ll diode s byw 83 r15 d2 r ? r2 r 3 100 r6 c ? t 47 f 25v 3 . 3 nf u211b 12 n l c1 150 nf 250v ~ c12 + 100 f 10v bzx55 c9v1 c10 2.2 f 10v + 4.7 f 10v c1 3 c4 c 3 c2 c6 6 8 0 pf 22 nf 220 nf 10 f/10v 470 nf 470 nf c11 3 4567 8 9 1 8 17 16 15 14 1 3 12 11 10 cny70 m
26 4752b?indco?09/05 u211b figure 10-22. speed control, maximum load control with reflective opto coupler cny70 as emitter the schematic diagram (see figure 10-22 on page 26 ) 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 deter- mined 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. + + + d1 1n4004 470 nf r1 10 k 1.1w 1 m 100 100 r10 1 k 220 k r6 8 2 k r11 8 20 k r5 2.2 k r 8 = 3 x 0.1 110 k r 3 gnd -v s 2 3 0v ~ 220 k r4 10 k r16 r ? r2 r12 c ? t i gt = 50 ma 22 f 25v 3 . 3 nf u211b 12 n l c1 4.7 f 10v 2.2 f 10v c9 c 3 c6 c2 c5 9v 1 nf 6 8 0 pf c12 150 pf 250v ~ c4 22 nf c11 3 4567 8 9 1 8 17 16 15 14 1 3 12 11 10 m r9 + s et s peed m a x. r7 16 k r 3 1 220 k r1 3 s et s peed min. r14 r1 8 470 r17 100 c7 c 8 + 4.7 f 10v c10 10 f 470 nf c1 3 1 f cny70
27 4752b?indco?09/05 u211b 12. package information 11. ordering information extended type number package remarks u211b-xy dip18 tube u211b-xfpy so16 tube u211b-xfpg3y 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
28 4752b?indco?09/05 u211b 13. revision history please note that the following page numbers referred to in this section refer to the specific revision mentioned, not to this document. revision no. history 4752b-indco-09/05 ? put datasheet in a new template ? first page: pb-free logo added ? page 27: ordering information changed
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