View U2008B-MY_6985359.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

features ? full wave current sensing compensated mains supply variations variable soft start or load-current sensing voltage and current synchronization switchable automatic retriggering triggering pulse typically 125 ma internal supply-v oltage monitoring current requirement 3 ma applications low-cost motor control domestic appliance 1. description the u2008b is designed as a phase-control circuit in bipolar technology. it enables load-current detection as well as mains-compensated phase control. motor control with load-current feedback and overload protection are preferred applications. figure 1-1. block diagram with typical circuit: load current sensing automatic retriggering limiting detector current detector full wave load current soft start voltage detector 7 phase control unit 6 mains voltage compensation supply voltage limiting reference voltage voltage monitoring 23 5 4 1 8 r 2 22 k ? /2 w byt51k tic 226 load load current compensation set point 100 nf 3.3 nf 230 v ~ gnd + - ^ v(r6) = 250 mv u2008b max 22 f/ 25 v ? = f(v 3 ) 330 k ? 1 m ? r 1 d 1 r 8 r 3 180 ? r 6 c 3 c 4 r 10 100 k ? 47 k ? r 7 p 1 r 14 -v s c 1 detector low-cost phase-control ic with soft start u2008b rev. 4712b?auto?10/05
2 4712b?auto?10/05 u2008b figure 1-2. block diagram with typi cal circuit: soft start automatic retriggering limiting detector current detector full wave load current detector soft start voltage detector 7 phase control unit ? = f(v 3 ) 6 mains voltage compensation supply voltage limiting reference voltage voltage monitoring 23 5 4 1 8 r 2 680 k ? 22 k ? /2w byt51k 470 k ? 180 ? tic 226 load 68 k ? set point 100 nf 10 nf 230 v ~ 50 k ? 220 k ? gnd 100 f/ 25 v + - l soft start 4.7 f/25 v n u2008b r 1 d 1 r 8 max -v s c 1 p 1 r 7 r 10 c 4 c 3 c 5 r 3
3 4712b?auto?10/05 u2008b 2. pin configuration figure 2-1. pinning 2.1 mains supply, pin 5 the integrated circuit u2008b, which also contains voltage limiting, can be connected via d 1 and r 1 to the mains supply, see figure 1-2 on page 2 . supply voltage, between pin 4 (pos., ) and pin 5, is smoothed by c 1 . the series resistance r1 can be calculated as follows: where: operation with externa lly stabilized dc voltage is not recommended. 1 2 3 4 8 7 6 5 isense c ? control gnd output vsync r ? - vs u2008b table 2-1. pin description pin symbol function 1 isense load current sensing 2c ? ramp voltage 3 control control input/compensation output 4 gnd ground 5 -vs supply voltage 6r ? ramp current adjustment 7 vsync voltage synchronization 8 output trigger output v m = mains voltage v smax = maximum supply voltage i tot = i smax + i x = total current compensation i smax = maximum current consumption of the ic i x = current consumption of the external components r 1max 0.85 v m v smax ? 2i tot ----------------------------- - =
4 4712b?auto?10/05 u2008b 2.2 voltage monitoring when the voltage is built up, uncontrolled output pulses are avoided by internal voltage monitor- ing. apart from that, all latches of the circuit (phase control, load limit regulation) are reset and the soft start capacitor is short circuited. this guarantees a specified start-up behavior each time the supply voltage is switched on or after short interruptions of the mains supply. soft start is ini- tiated after the supply voltage has been built up. this behavior guarantees a gentle start-up for the motor and automatically ensures the optimum run-up time. 2.3 phase control, pin 6 the function of the phase control is identical to that of the well-known ic u211b. the phase angle of the trigger pulse is derived by comparing the ramp voltage v 2 at pin 2 with the set value on the control input, pin 3. the slope of the ramp is determined by c 3 and its charging current i ? . the charging current can be regulated, changed or altered using r 8 at pin 6. the maximum phase angle, max , (minimum current flow angle ? min ) can also be adjusted by using r 8 (see figure 5-1 on page 7 ). when the potential on pin 2 reaches the set point level of pin 3, a trigger pulse is generated whose pulse width, t p , is determined from the value of c 3 (t p = 9 s/nf, figure 5-3 on page 8 ). at the same time, a latch is set with the output pul se, as long as the automatic retriggering has not been activated, then no more pulses can be generat ed in that half cycle. control input at pin 3 (with respect to pin 4) has an active range from -9 v to -2 v. when v 3 = -9 v the phase angle is at its maximum amax, i.e., the current flow angl e is minimum. the minimum phase angle amin is set with v 3 -1 v. 2.4 automatic retriggering the current-detector circuit monitors the state of the triac after triggering by measuring the volt- age drop at the triac gate. a current flow through the triac is recognized when the voltage drop exceeds a threshold level of typically 40 mv. if the triac is quenched within the relevant half wave after triggering (for example owing to low load currents before or after the zero crossing of current wave, or for commutator motors, owing to brush lifters), the automatic retriggering circ uit ensures immediate retriggering, if necessary with a high repetition rate, t pp /t p , until the triac remain s reliably triggered. 2.5 current synchronization, pin 8 current synchronization fulfils two functions: monitoring the current flow after triggering. in case the triac extinguishes again or it does not switch on, automatic triggering is activated as long as triggering is successful. avoiding triggering due to inductive load. in the case of inductive load operation, the current synchronization ensures that in the new half wave no pulse is enabled as long as there is a current available from the previous half wave, which flows from the opposite polarity to the actual supply voltage. a special feature of the ic is the realization of current synchronization. the device evaluates the voltage at the pulse output between the gate and reference electrode of the triac. this results in saving the separate current synchronization input with specified series resistance.
5 4712b?auto?10/05 u2008b 2.6 voltage synchronization with mains voltage compensation, pin 7 the voltage detector synchronizes the reference ramp with the mains supply voltage. at the same time, the mains-dependent input current at pin 7 is shaped and rectified internally. this current activates automatic retriggering and at the same time is available at pin 3 ( figure 5-5 on page 9 ). by suitable dimensioning, it is possible to attain the specified compensation effect. automatic retriggering and mains voltage compensation are not activated until ? v 7 - v 4 ? increases to 8 v. the resistance r sync. defines the width of the zero voltage cross-over pulse, synchronization current, and hence the mains supply voltage compensation current. if the mains voltage compensation and the automatic retriggering are not required, both functions can be suppressed by limiting ? v 7 - v 4 ? 7 v (see figure 2-2 ). figure 2-2. suppression of automatic retriggering and mains voltage compensation a further feature of the ic is the selection bet ween soft start and load-current compensation. soft start is possible by connecting a capacitor between pin 1 and pin 4 ( figure 5-4 on page 8 ). in the case of load-current compensation, pi n 1 is directly connected with resistance r 6 , which is used for sensing load current. 2.7 load current de tection, pin 1 the circuit continuously measures the load current as a voltage drop at resistor r 6 . the evalua- tion and use of both half waves results in a quick reaction to load-current change. due to voltage at resistor r 6 , there is an increase of input current at pin 1. this current increase controls the internal current source, whose positive cu rrent values are available at pin 3 (see figure 5-7 on page 9 ). the output current generated at pin 3 contains the difference from the load-current detection and the mains-voltage compensation (see figure 5-5 on page 9 ). the effective control voltage is the final current at pin 3 together with the desired value network. an increase of mains voltage causes an increase of the control angle . an increase of load cur- rent results in a decrease of the control angle. this avoids a decrease in revolution by increasing the load as well as an increase of revolution by the increment of mains supply voltage. r 2 2x bzx55 c6v2 u2008b 7 4 mains
6 4712b?auto?10/05 u2008b 3. absolute maximum ratings v s = 14 v, reference point pin 4, unless otherwise specified parameters symbol value unit current limitation pin 5 t 10 s -i s 30 ma -i s 100 ma synchronous currents pin 7 t 10 s i syncv i syncv 5 20 ma ma phase control pin 3 control voltage -v i v s to 0 v input current i i 500 ma charge current pin 6 -i ? max 0.5 ma load current monitori ng/soft start, pin 1 input current i i 1ma input voltage v i -v s to +2 v pulse output input voltage pin 8 +v i -v i 2 v s v v storage temperature range t stg -40 to +125 c junction temperature range t j -10 to +125 c 4. thermal resistance parameters symbol value unit junction ambient dip8 r thja 110 k/w so8 on p.c. r thja 220 k/w so8 on ceramic r thja 140 k/w 5. electrical characteristics parameters test conditions symbol min. typ. max. unit supply (pin 5) supply-voltage limitation -i s = 3.5 ma -i s = 30 ma -v s -v s 14.5 14.6 16.5 16.8 v v current requirement pins 1, 4 and 7 open -i s 3.0 ma voltage monitoring (pin 5) turn-on threshold -v ton 11.3 12.3 v phase control input current voltage sync. pin 7 current sync. pin 8 i syncv i synci 3 0.15 2 30 ma a voltage limitation i l = 2 ma pin 7 v syncv 8.0 8.5 9.0 v reference ramp (see figure 5-1 on page 7 ) charge current pin 7 i ? 1 100 a start voltage pin 2 -v max 1.85 1.95 2.05 v
7 4712b?auto?10/05 u2008b figure 5-1. ramp control temperature coefficient of start voltage pin 2 -tc r -0.003 %/k r ? - reference voltage i ? = 10 a, pins 6 to 5 v r ? 0.96 1.02 1.10 v temperature coefficient i ? = 10 a, pin 6 i ? = 1 a tc vr ? tc vr ? 0.03 0.06 %/k %/k pulse output (see figure 5-2 on page 8 ) (pin 8) output-pulse current v 8 = -1.2, r gt = 0 ? i 0 100 125 150 ma output-pulse width c 3 = 3.3 nf, v s = v limit t p 30 s automatic retriggering (pin 8) turn-on threshold voltage v ion 20 60 mv repetition rate i 7 150 a t pp 357.5t p soft start (see figure 5-4 on page 8 ) (pin 1) starting current v 1?4 = 8 v i 0 51015a final current v 1?4 = -2 v i 0 15 25 40 a discharge current -i 0 0.5 ma output current pin 3 -i 0 0.2 2 ma mains voltage compensation (see figure 5-5 on page 9 ) current transfer gain i 7 /i 3 pins 7, pin 3 pins 1 and 2 open g i 14 17 20 reverse current v (r6) = v 3 = v 7 = 0, pin 3 i r 2a load-current detection, v 7 = 0 (see figure 5-7 on page 9 ) transfer gain i 3 /v 1 g 0.28 0.32 0.37 a/mv offset current v 1 = 0, v 3 = -8 v, pin 3 i 0 036a input voltage pin 1 -v i 300 400 mv input offset voltage pin 1 v 0 6mv 5. electrical characteristics (continued) parameters test conditions symbol min. typ. max. unit 0 50 100 150 200 250 0 200 400 600 800 1000 r ? (r 8 ) (k ? ) phase angle () 33 nf 10 nf 6.8 nf 4.7 nf 3.3 nf 2.2 nf c ? /t = 1.5 nf
8 4712b?auto?10/05 u2008b figure 5-2. pulse output figure 5-3. output pulse width figure 5-4. option soft start 0 200 400 600 800 0 20 40 60 80 120 i g t ( m a ) r gt ( ? ) 1000 100 v gt = -1.2 v 0 100 200 300 400 0102030 c ? (nf) t p ( s) ? t p / ? c ? = 9 s/nf 01 2 3 4 -5 -4 -3 -2 -1 1 v 1 - 4 ( v ) t ( s ) 5 0 4.7 f 10 f c 5 = 1 f supply r 1 = 22 k ? /2 w c 1 = 100 f/25 v
9 4712b?auto?10/05 u2008b figure 5-5. mains voltage compensation figure 5-6. maximum resistance of r 1 figure 5-7. load-current detection -200 -160 -120 -80 -40 0 -2 -1 0 1 2 i 7 (ma) i 3 ( a) reference point pin 10 pins 1 v s = -13 v 02 4 6 8 0 20 40 60 80 100 r 1 m a x ( k ? ) i s (ma) 1 0 max. series resistance v m = 230 v 0 40 80 120 160 200 -400 -200 0 200 400 v (r6) (mv) i 5 ( a) reference point pin 8 v 6 = r ef = v 8 v s = -13 v v 15 = v 10 = 0 v
10 4712b?auto?10/05 u2008b figure 5-8. power dissipation of r 1 figure 5-9. power dissipation of r 1 according to current consumption 010203040 0 2 4 6 8 10 p v ( w ) r1 (k ? ) 50 power dissipation at series resistance r 1 0 2 4 6 8 10 0 3 6 9 12 15 i s (ma) p v (w) power dissipation at series resistance
11 4712b?auto?10/05 u2008b 7. package information 6. ordering information extended type number package remarks u2008b-xy dip8 tube, pb-free u2008b-xfpy so8 tube, pb-free u2008b-xfpg3y so8 taped and reeled, pb-free 9.8 9.5 package dip8 dimensions in mm 1.64 1.44 4.8 m ax 0.5 min 3.3 0.58 0.48 7.62 2.54 6.4 max 0.36 m ax 9.8 8.2 7.77 7.47 85 14 technical drawings according to din s p e c ifica tio n s 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
12 4712b?auto?10/05 u2008b 8. 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 4712b-auto-08/05 ? put datasheet in a new template ? first page: pb-free logo added ? page 11: ordering information changed
printed on recycled paper. 4712b?auto?10/05 ? atmel corporation 2005 . all rights reserved. atmel ? , logo and combinations thereof, everywhere you are ? and others, are registered trade- marks or trademarks of atmel corporation or its subsidiari es. other terms and product names may be trademarks of others. disclaimer: the information in this document is provided in connection with atmel products. no license, express or implied, by estoppel or otherwise, to any intellectual property right is granted by this document or in connection with the sale of atmel products. except as set forth in atmel?s terms and condi- tions of sale located on atmel? s web site, atmel assumes no liability whatsoever and disclaims any express, implied or statutor y warranty relating to its products including, but not limited to, the implied warranty of merchantability, fitness for a particu lar purpose, or non-infringement. in no event shall atmel be liable for any direct, indirect, conseque ntial, punitive, special or i nciden- tal damages (including, without limitation, damages for loss of profits, business interruption, or loss of information) arising out of the use or inability to use this document, even if at mel has been advised of the possibility of such damages. atmel makes no representations or warranties with respect to the accuracy or completeness of the contents of this document and reserves the ri ght to make changes to specifications and product descriptions at any time without notice. atmel does not make any commitment to update the information contained her ein. unless specifically provided otherwise, atmel products are not suitable for, and shall not be used in, automotive applications. atmel?s products are not int ended, authorized, or warranted for use as components in applications intended to support or sustain life. atmel corporation atmel operations 2325 orchard parkway san jose, ca 95131, usa tel: 1(408) 441-0311 fax: 1(408) 487-2600 regional headquarters europe atmel sarl route des arsenaux 41 case postale 80 ch-1705 fribourg switzerland tel: (41) 26-426-5555 fax: (41) 26-426-5500 asia room 1219 chinachem golden plaza 77 mody road tsimshatsui east kowloon hong kong tel: (852) 2721-9778 fax: (852) 2722-1369 japan 9f, tonetsu shinkawa bldg. 1-24-8 shinkawa chuo-ku, tokyo 104-0033 japan tel: (81) 3-3523-3551 fax: (81) 3-3523-7581 memory 2325 orchard parkway san jose, ca 95131, usa tel: 1(408) 441-0311 fax: 1(408) 436-4314 microcontrollers 2325 orchard parkway san jose, ca 95131, usa tel: 1(408) 441-0311 fax: 1(408) 436-4314 la chantrerie bp 70602 44306 nantes cedex 3, france tel: (33) 2-40-18-18-18 fax: (33) 2-40-18-19-60 asic/assp/smart cards zone industrielle 13106 rousset cedex, france tel: (33) 4-42-53-60-00 fax: (33) 4-42-53-60-01 1150 east cheyenne mtn. blvd. colorado springs, co 80906, usa tel: 1(719) 576-3300 fax: 1(719) 540-1759 scottish enterprise technology park maxwell building east kilbride g75 0qr, scotland tel: (44) 1355-803-000 fax: (44) 1355-242-743 rf/automotive theresienstrasse 2 postfach 3535 74025 heilbronn, germany tel: (49) 71-31-67-0 fax: (49) 71-31-67-2340 1150 east cheyenne mtn. blvd. colorado springs, co 80906, usa tel: 1(719) 576-3300 fax: 1(719) 540-1759 biometrics/imagin g/hi-rel mpu/ high speed converters/rf datacom avenue de rochepleine bp 123 38521 saint-egreve cedex, france tel: (33) 4-76-58-30-00 fax: (33) 4-76-58-34-80 literature requests www.atmel.com/literature

▲Up To Search▲

Price & Availability of U2008B-MY

	To Download U2008B-MY Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .