o1806 ms im / d3096ha (ot) no.5505-1/9 LB1845 overview the LB1845 is a pwm current control type stepping motor driver that uses a bipolar drive scheme. it is particularly suitable for driving carriage and paper feed stepping motors in printers and similar products. features ? pwm current control (fixed off time scheme) ? digital load current selection function ? sustained output voltage: 45v ? built-in thermal shutdown circuit specifications absolute maximum ratings at ta = 25 c parameter symbol conditions ratings unit motor supply voltage v bb max 45 v peak output current i o peak tw 20 s 1.75 a continuous output current i o max 1.5 a logic block supply voltage v cc 7.0 v logic input voltage range v in -0.3 to v cc v emitter output voltage v e 1.0 v pd max1 independent ic 3.0 w allowable power dissipation pd max2 with an arbitrarily large heat sink 20.0 w operating temperature topr -20 to +85 c storage temperature tstg -55 to +150 c ordering number : en5505d monolithic digital ic pwm current controlling stepping motor driver any and all sanyo semiconductor products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft's control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. consult with your sanyo semiconductor representative nearest you before usingany sanyo semiconductor products described or contained herein in such applications. sanyo semiconductor assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated val ues (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all sanyo semiconductor products described or contained herein.
LB1845 no.5505-2/9 recommended operating ranges at ta = 25 c parameter symbol conditions ratings unit motor supply voltage v bb 10 to 44.5 v logic block supply voltage v cc 4.75 to 5.25 v reference voltage v ref 1.5 to 7.5 v electrical characteristics at ta = 25 c, v bb = 38v, v cc = 5v, v ref = 5v ratings parameter symbol conditions min typ max unit [output block] i bb on 12 16 output stage supply current i bb off 0.7 0.9 ma v o (sat)1 i o = +1.0a sink 1.2 1.4 v o (sat)2 i o = +1.5a sink 1.4 1.7 v o (sat)3 i o = -1.0a source 1.1 1.3 output saturation voltage 1 v o (sat)4 i o = -1.5a source 1.3 1.6 v i o (leak)1 v o = v bb sink 50 output leakage current i o (leak)2 v o = 0v source -50 a sustained output voltage v(sus) * 45 v [logic block] i cc on i 0 = 0.8v, i 1 = 0.8v 19.5 25.3 logic supply current i cc off i 0 = 2.4v, i 1 = 2.4v 15.5 20.1 ma v ih 2.4 input voltage v il 0.8 v i ih v ih = 2.4v 10 input current i il v il = 0.8v -10 a i 0 = 0.8v, i 1 = 0.8v 9.5 10 10.5 i 0 = 2.4v, i 1 = 0.8v 13.5 15 16.5 current control threshold voltage v ref /v sense i 0 = 0.8v, i 1 = 2.4v 25.5 30 34.5 thermal shutdown temperature t s 170 c * note: design guaranteed value. package dimensions unit: mm (typ) 3147c sanyo : dip28h(500mil) 1 14 28 15 0.4 0.6 4.04.0 26.75 20.0 r1.7 8.4 (1.81) 1.78 1.0 12.7 11.2
LB1845 no.5505-3/9 truth table enable phase outa outb l h h l l l l h h - off off i 0 i 1 output current l l v ref /(10r e ) = i out h l v ref /(15r e ) = i out 2/3 l h v ref /(30r e ) = i out 1/3 h h 0 note: outputs is off when enable is high or in the i 0 = i 1 = high state. pin assignment ilb00880 pd max - ta allowable power dissipation, pd max - w ambient temperature, ta- c 0 4 3 8 12 16 20 24 10.4 1.56 --20 0 20 40 60 80 100 w ith a n a rb itra rily la rg e h e a t s in k i n d e p e n d e n t i c LB1845 123456 91011121314 78 ilb00881 24 18 23 22 16 21 15 20 19 26 25 17 28 27 enable1 phase2 i 1 1 i 0 1 rc2 i 0 2 gnd i 1 2 enable2 v ref 1 phase1 v ref 2 v cc rc1 nc d-gnd out 1b out 1a sense2 out 2b v bb out 2a nc e1 d-gnd e2 v bb sense1
LB1845 no.5505-4/9 block diagram application circuit diagram ilb00882 + ? + ? + ? current control block phase1 + ? + ? v ref1 enable1 v cc one shot 470pf 330pf 56k ? 0.82 ? (1w) 1k ? sense1 sense2 e1 rc1 d-gnd gnd v bb v bb sbd sbd out 1a out 1b i 0 1 i 1 1 + ? + ? + ? phase2 + ? + ? v ref 2 enable2 one shot 56k ? 0.82 ? (1w) 470pf 330pf 1k ? e2 rc2 v bb sbd sbd out 2b out 2a i 0 2 i 1 2 output block thermal shutdown output block output block output block output block output block output block output block current control block 3 e1 2 sense1 1 v bb 4 d-gnd 5 nc 6 out1b 7 out1a 8 out2b 9 out2a 10 nc 11 d-gnd 12 e2 13 sense2 14 v bb 26 ilb00883 re=0.82 ? (1w) v ref =5v rt=56k ? ct=470pf rc=1k? cc=330pf cbb=100 f v ref 1 27 rc1 28 v cc 25 phase1 24 enable1 23 i11 22 i01 21 i02 20 i12 19 enable2 18 phase2 17 v ref 2 16 rc2 15 gnd off time setting values toff ctrt digital control signals digital control signals cc rc re rc sbd sbd sbd sbd re cc motor cbb 100 f ccc ct ct rt r1 pwm2 pwm1
LB1845 no.5505-5/9 pin description pin no pin function 1, 14 v bb output stage power-supply voltage 2 13 sense1 sense2 set current detection pins. connect these pins, fed back through noise filters, to e1 and e2. 3 12 e1 e2 the set current is controlled by the resistors re inserted between these pins and ground. 4, 11 d-gnd internal diode anode connection 6 7 8 9 out1b out1a out2b out2a outputs 15 gnd ground 27 16 rc1 rc2 used to set the output off time for the switched output signal. the fixed off times are set by the capacitors and resistors connected to these pins. toff = cr. 26 17 v ref 1 v ref 2 output current settings the output current is determined by the voltage (in the range 1.5 to 7.5v) input to these pins. 25 18 phase1 phase2 output phase switching inputs. high-level input: outa = high, outb = low low-level input: outa = low, outb = high 24 19 enable1 enable2 output on/off settings high-level input: output off low-level input: output on 22, 23 21, 20 i 0 1, i 1 1 i 0 2, i 1 2 digital inputs that set the output current the output currents can be set to 1/3, 2/3, or full by setting th ese pins to appropriate combinations of high and low levels. 28 v cc logic block power supply timing chart for pin switching operations during pwm drive figure 1 switching waveforms t off : output off time. determined by external capacitor and resistor ct and rt. (toff ct rt) t d : delay time between the point the set current is sensed at the sense pin and the point the output turns off. ilb00884 rc pin e pin sense pin v out pin t d spike noise t off
LB1845 no.5505-6/9 usage notes 1. external diode since this ic adopts a system based on lower side transistor switching drive, an external diode for the regenerative current that occurs during switching is required between v bb and v out . use a schottky barrier diode with a low feedthrough current. 2. noise filters since spike noise (see figure 1) occurs wh en switching to the on state due to the external diode?s feedthrough current, applications must remove noise from the sense pin with a noise filter (cc, rc) between the e pin and the sense pin. however, note that if the values of cc and rc are too la rge, the sense voltage rise will be slowed, and the current setting will be shifted toward s a higher current level. 3. v ref pin it is possible to change the output current continuously by continuously changing the v ref pin voltage. however, this voltage cannot be set to 0v. the v ref pin input impedance is 26k ? ( 30%) when v ref is 5v. since this pin is used to set the output current, applications must be designed so that noise does not appear on this pin's input. 4. gnd pin since this ic switches large currents, care must be taken to avoid ground loops when the ic is mounted in the application. the section of the pcb that handles large currents should be designed with a low-impedance pattern, and must be separated from the small signal sections of the circuit. in particular, the ground for the sense resistor re must be as close as possible to the ic ground. 5. operation in hold mode there are cases where a current somewhat larger than the cu rrent setting may flow in hold mode (light load mode). since this ic adopts a lower side switching, lower side se nse system, the emitter voltage falls and the sense voltage goes to 0 when the switching state goes to off. the circuit then always turns the output on after the toff period has elapsed. at this time, due to the light load, the existence of the time td, and the fact that the output goes on even if the output current is higher than the set current, the output current will be somewhat higher than the set current. applications should set the current setting some what lower than required if this occurs. 6. function for preventing the upper and lower outputs being on at the same time this ic incorporates a built-in circuit that prevents the through currents that occur when the phase is switched. the table lists the output on and off delay times when phase and eanble are switched. sink side source side on delay time 10 s 9 s when phase is switched off delay time 1.5 s 3 s on delay time 9 s 9 s when enable is on off delay time 1.5 s 6.5 s 7. 1-2 phase excitation and the double 1-2 phase excitation control sequence to reduce the vibration that occurs when the motor turns, this ic supports 1-2 phase excitation and double 1-2 phase excitation by using the output current setting digital input pins i 0 and i 1 without changing the v ref pin voltage. tables 1 and 2 list that control sequence, and figure 2 and figure 3 present the composite vector diagram for this sequence.2. noise filters
LB1845 no.5505-7/9 table 1 [1-2 phase excitation] 1/2 step enable1 = enable2 = 0 phase a phase b no ph1 i 1 1 i 0 1 current value ph2 i 1 2 i 0 2 current value 0 0 0 0 1 * 1 1 0 1 0 0 1 2/3 0 0 1 2/3 2 * 1 1 0 0 0 0 1 3 1 0 1 2/3 0 0 1 2/3 4 1 0 0 1 * 1 1 0 5 1 0 1 2/3 1 0 1 2/3 6 * 1 1 0 1 0 0 1 7 0 0 1 2/3 1 0 1 2/3 table 2 [double 1-2 phase exci tation] about 1/4 step enable1 = enable2 = 0 phase a phase b no ph1 i 1 1 i 0 1 current value ph2 i 1 2 i 0 2 current value 0 0 0 0 1 * 1 1 0 1 0 0 0 1 0 1 0 1/3 2 0 0 1 2/3 0 0 1 2/3 3 0 1 0 1/3 0 0 0 1 4 * 1 1 0 0 0 0 1 5 1 1 0 1/3 0 0 0 1 6 1 0 1 2/3 0 0 1 2/3 7 1 0 0 1 0 1 0 1/3 8 1 0 0 1 * 1 1 0 9 1 0 0 1 1 1 0 1/3 10 1 0 1 2/3 1 0 1 2/3 11 1 1 0 1/3 1 0 0 1 12 * 1 1 0 1 0 0 1 13 0 1 0 1/3 1 0 0 1 14 0 0 1 2/3 1 0 1 2/3 15 0 0 0 1 1 1 0 1/3 composite vector diagram [1-2 phase excitation] [double 1-2 phase excitation] p hase b phase a (0) (1) (2) ilb00885 phase b phase a (0) (1) (2) (3) (4) ilb00886 figure 3 composite vector diagram for the sequence in table 2 (1/4 cycle) figure 2 composite vector diagram for the sequence in table 1 (1/4 cycle)
LB1845 no.5505-8/9 ilb00887 i bb - v bb output stage supply current, i bb - ma output stage power-supply voltage, v bb - v 0 2 4 6 8 10 12 14 16 0 4 8 12 16 20 24 28 32 36 40 44 46 v cc =5v v ref =5v ilb00888 i cc, i bb - v cc 0 4 8 12 16 20 24 28 32 0 4 8 12 16 20 24 28 32 567 4 38 012 ilb00890 v o (sat) - i out output current, i out - a 0 0.4 0.8 1.2 1.6 0 0.4 0.8 1.2 1.6 2.0 2.4 v bb =38v v ref =5v output off i bb output off i b b o u tp u t o n i c c i b b ilb00889 i cc, i bb - v cc logic block supply current, i cc - ma logic block supply voltage, v cc - v 0 4 8 12 16 20 24 28 32 0 4 8 12 16 20 24 28 32 567 4 38 012 v bb =38v v ref =5v output on v bb =45v v cc =5v v ref =5v i c c i b b ilb00891 v o (sat) -- i out output saturation voltage, v o (sat) - v output current, i out - a 0 0.4 0.8 1.2 1.6 0 0.4 0.8 1.2 1.6 2.0 2.4 v bb =45v v cc =5v v ref =5v (source side) (sink side) output saturation voltage, v o (sat) - v output stage supply current, i bb - ma logic block supply voltage, v cc - v logic block supply current, i cc - ma output stage supply current, i bb - ma
LB1845 no.5505-9/9 ps this catalog provides information as of october, 2006. specifications and information herein are subject to change without notice. specifications of any and all sanyo semiconductor products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products or equipment. to verify s ymptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer's products or equipment. sanyo semiconductor co., ltd. strives to supply high- quality high-reliability products. however, any and all semiconductor products fail with some probabi lity. it is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire, or that could cause damage to other property . when designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. in the event that any or all sanyo semiconductor produc ts (including technical data,services) described or contained herein are controlled under any of applicable local export control laws and regulations, such products must not be exported without obtaining the export license from the authorities concerned in accordance with the above law. no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording , or any information storage or retrieval system, or otherwise, without the prior written permission of sanyo semiconductor co., ltd. any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. when designing equipment, refer to the "delivery specification" for the sanyo semiconductor product that you intend to use. information (including circuit diagrams and circui t parameters) herein is for example only; it is not guaranteed for volume production. sanyo semicondu ctor believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties.
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