41107 ti pc b8-6489, 6394 no.7633-1/9 http://onsemi.com semiconductor components industries, llc, 2013 june, 2013 LB1945D overview the LB1945D is a pwm current control stepping motor driver that uses a bipolar drive technique. it is optimal for use with the carriage and paper feed stepping motors used in printers. functions and features ? pwm current control (external clock) ? digital load current selection function (supports 1-2, w1-2, and 2-phase excitation) ? built-in high and low side diodes ? simultaneous on state prevention function (through-current prevention) ? built-in thermal shutdown circuit ? noise canceling function specifications absolute maximum ratings at ta = 25 c parameter symbol conditions ratings unit motor supply voltage v bb max 30 v output peak current i o peak tw 20 s 1.0 a output continuous current i o max 0.8 a logic system supply voltage v cc max 6.0 v logic input voltage range v in -0.3 to v cc v emitter output voltage range ve 1.0 v allowable power dissipation pd max independent ic 2.8 w operating temperature topr -20 to +90 c storage temperature tstg -55 to +150 c monolithic digital ic pwm current control stepping motor driver orderin g numbe r : en7633a stresses exceeding maximum ratings may damage the device. maximum ratings are stress ratings only. functional operation above the recommended oper ating conditions is not implied. extended exposure to stresses above the recommended operating conditions may affect device reliabili ty.
LB1945D no.7633-2/9 recommended operating range at ta = 25 c parameter symbol conditions ratings unit motor supply voltage v bb 10 to 28 v logic system supply voltage v cc 4.75 to 5.25 v reference voltage vref 1.5 to 5.0 v electrical characteristics at ta = 25 c, v bb = 24v, v cc = 5v, vref = 5v ratings parameter symbol conditions min typ max unit output block output stage supply current i bb on i bb off i 1 = 0.8v, i 2 = 0.8v, enable = 0.8v enable = 3.2v 0.5 1.0 2.0 0.2 ma output saturation voltage 1 v o sat1 i o = +0.5a, sink side 0.3 0.5 v output saturation voltage 2 v o sat2 i o = +0.8a, sink side 0.5 0.7 v output saturation voltage 3 v o sat3 i o = -0.5a, source side 1.6 1.8 v output saturation voltage 4 v o sat4 i o = -0.8a, source side 1.8 2.0 v output leakage current v o 1(leak) v o 2(leak) v o = v bb , sink side v o = 0v, source side -50 50 a output sustain voltage vsus l = 3.9mh, i o = 1.0a* 30 v logic block logic supply current i cc on i cc off i 1 = 0.8v, i 2 = 0.8v, enable = 0.8v enable = 3.2v 50 7 70.0 10.0 92 13 ma input voltage v ih v il 3.2 1.8 v input current i ih i il v ih = 3.2v v il = 0.8v 35 7 50 10 65 13 a set current control threshold value vref/ vsen i 1 = 0.8v, i 2 = 0.8v i 1 = 3.2v, i 2 = 0.8v i 1 = 0.8v, i 2 = 3.2v 9.5 13.5 25.5 10 15 30 10.5 16.5 34.5 reference current iref vref = 5.0v, i 1 = 0.8v, i 2 = 0.8v 17.5 25 32.5 a cr pin current icr cr = 1.0v -1.0 a thermal shutdown temperature ts 170 c thermal shutdown hysteresis tshy 40 c *: the design specification items are design guarantees and are not measured. package dimensions unit:mm (typ) 3147c sanyo : dip28h(500mil) 1 14 28 15 0.4 0.6 4.0 4.0 26.75 20.0 r1.7 8.4 (1.81) 1.78 1.0 12.7 11.2 0 2.5 3.0 2.8 1.5 0.5 1.0 2.0 3.5 -20 10 0 80 60 20 40 0 1.34 ambient temperature, ta ? c allowable power dissipation, pd max ? w pd max ? ta independent ic
LB1945D no.7633-3/9 pin assignment pin functions pin no. pin description 22 v bb 1 output stage power supply voltage 5 v bb 2 high side diode cathode connection 24 6 e1 e2 the set current is controlled by inserting resistors re between these pins and ground. 27 28 2 1 outa outa outb outb output pins 15 gnd ground 14 s-gnd sense ground 4, 25 subgnd ic sub-ground 23 7 d-gnd low side built-in diode ground (anode side) 8 cr chopping is performed at the period of a triangle wa ve set by the rc circuit connected to this pin. the triangle wave off time is the noise cancellation time. 16 13 vref1 vref2 output current settings. (the output current is determined by prov iding an input in the range 1.5v to 5v.) 20 9 phase1 phase2 output phase switching inputs high-level input: outa = high, outa = low low-level input: outa = low, outa = high 19 10 enable1 enable2 output on/off control inputs high-level input: output off low-level input: output on 17, 18 12, 11 ia1, ia2 ib1, ib2 output current setting digital inputs. the output current is set to 1/3, 2/3 or 1 by input high/low levels to these pins. 21 v cc logic block power supply voltage 28 LB1945D top view 27 26 25 24 23 22 21 20 19 18 17 16 15 outb 1 2 3 4 5 6 7 8 9 10 11 12 13 14 outb nc subgnd v bb e2 d-gnd cr phase2 enable2 ib2 ib1 vref2 s-gnd subgnd e1 d-gnd v bb v cc phase1 enable1 ia2 ia1 vref1 gnd outa outa nc ilb01555
LB1945D no.7633-4/9 block diagram enable1 control logic circuit phase1 enable2 ia2 ia1 control logic circuit v bb 1 outa outb outa s-gnd phase2 ib1 ib2 gnd e2 thermal shutdown circuit vref1 e1 vref2 cr outb d-gnd d-gnd v cc current selection circuit current selection circuit blanking time osc blanking time subgnd subgnd v bb 2 ilb01559
LB1945D no.7633-5/9 application circuit outa LB1945D outa nc subgnd e1 d-gnd v bb v cc phase1 enable1 ia2 ia1 vref1 gnd outb outb nc subgnd e2 d-gnd cr phase2 enable2 v bb ib2 ib1 vref2 s-gnd 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 0.5 820pf 0.5 24v 47 5v 10 5v 10 ilb01556 motor l motor l logic input logic input 56k
LB1945D no.7633-6/9 truth table enable phase outa outa low high high low low low low high high - off off i 1 i 2 output current low low vref/(10 r e ) = i out high low vref/(15 r e ) = i out 2/3 low high vref/(30 r e ) = i out 1/3 high high 0 note: the output is turned off when enable is high or in the i 1 = i 2 = high state. clockwise/counterclockw ise operating sequence 2-phase excitation drive clockwise rotation ia1 = ia2 = ib1 = ib2 = 0 no. phase1 outa outa phase2 outb outb 0 0 0 1 0 0 1 1 1 1 0 0 0 1 2 1 1 0 1 1 0 3 0 0 1 1 1 0 counterclockwise rotation ia1 = ia2 = ib1 = ib2 = 0 no. phase1 outa outa phase2 outb outb 0 0 0 1 1 1 0 1 1 1 0 1 1 0 2 1 1 0 0 0 1 3 0 0 1 0 0 1 control sequence 2-phase excitation table 1 enable1 = enable2 = 0 phase a phase b no ph1 ia2 ia1 current value ph2 ib2 ib1 current value 0 0 0 0 1 0 0 0 1 1 1 0 0 1 0 0 0 1 2 1 0 0 1 1 0 0 1 3 0 0 0 1 1 0 0 1 1-2 phase excitation - 1/2 step table 2 enable1 = enable2 = 0 phase a phase b no. ph1 ia2 ia1 current value ph2 ib2 ib1 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
LB1945D no.7633-7/9 1-2 phase excitation timing chart ph1 ia2 ia1 ph2 ib2 ib1 i out 1 v out 1 i out 2 0 1 2 3 4 5 6 7 v out 2 1 cycle = t ilb01558
LB1945D no.7633-8/9 w1-2 phase excitation - about 1/4 step table 3 enable1 = enable2 = 0 phase a phase b no ph1 ia2 ia1 current value ph2 ib2 ib1 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 w 1-2 phase excitation timing chart ph ia ia ph ib ib i out v ou i out 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 v ou 1 cyc l e = ilb01557
LB1945D ps no.7633-9/9 simplified equations for dete rmining rc component values the equations for setting the rc oscillator circuit ri se time (t1) and fall time (t2) are shown below. t1 0.44c r (s) t2 0.72 ( c r 1000 )/( r + 1000 ) (s) (c:220 to 4700pf, r = 10 to 150k ) the oscillator frequency must be set using the simplified equations shown above. note that the triangle wave fall time (t2) is also used as the noise canceller time. usage notes 1. vref since the vref pin is the input pin for the reference voltage that sets the current, applications must be designed so that noise does not appear on this pin. 2. ground pins since this ic switches high currents, the following points concerning grounding must be observed. ? the fins on the package rear surface, pins 7 an d 8, and pins 21 and 22 must all be grounded. ? sections of the circuit that carry large currents must be implemented with wide lines in the printed circuit pattern, and must be physically separated from the small signal system. ? the e pin sense resistor (re) must be position as close as possible to the ic ground (pin 14). ? the capacitors between v cc and ground and between v bb and ground must be positioned as close as possible to the v cc and v bb pins on the printed circuit pattern. t1 t2 cr t2 motor on semiconductor and the on logo are registered trademarks of semiconductor components industries, llc (scillc). scillc owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. a listing of scillc?s product/patent coverage may be accessed at www.onsemi.com/site/pdf/patent-marking.pdf. scillc reserves the right to make changes without further notice to any products herein. scillc mak es no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does scillc assume any liability ar ising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequentia l or incidental damages. ?typical? parameters which may be provided in scillc data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. all operating parameters, including ?typicals? must be validated for each customer application by customer?s techn ical experts. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorize d for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other appli cation in which the failure of the scillc product could create a situation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indemnify and hold scillc and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of persona l injury or death associated with such unintended or unauthorized use, even if such claim alleges that scillc was negligent regarding the design or manufacture o fthe part. scillc is an equal opportunity/affirmative action employer. this literature is subject to all applicable copyright laws a nd is not for resale in any manner.
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