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specifications of any and all sanyo semiconductor co.,l td. 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 symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer ' sproductsor equipment. any and all sanyo semiconductor co.,ltd. products described or contained herein are, with regard to "standard application", intended for the use as general electronics equipment (home appliances, av equipment, communication device, office equipment, industrial equ ipment etc.). the products mentioned herein shall not be intended for use for any "special application" (medica l equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, t ransportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of re liability and can directly threaten human lives in case of failure or malfunction of the product or may cause har m to human bodies, nor shall they grant any guarantee thereof. if you should intend to use our products for app lications outside the standard applications of our customer who is considering such use and/or outside the scope of our intended standard applications, please consult with us prior to the intended use. if there is n o consultation or inquiry before the intended use, our customer shall be solely responsible for the use. d2607 ms pc 20060201-s00001/n2206/d1504tn(ot)/81004tn(ot) no.7947-1/13 lb11948t overview the lb11948t is a low saturation voltage output pwm current control bipolar drive stepping motor driver. it is optimal for use as the driver for the miniature low-voltage stepping motors used in portable electronic equipment such as portable thermal printers. features ? pwm current control (external excitation) ? simultaneous on state prevention function (through current prevention) ? thermal shutdown circuit ? noise canceller function ? low-power mode control pin specifications absolute maximum ratings at ta = 25 c parameter symbol conditions ratings unit vs supply voltage vs -0.3 to + 18 v logic system supply voltage v cc -0.3 to + 18 v peak output current i o peak tw 20 s 0.5 a continuous output current i o max 0.4 a emitter output voltage ve 1.0 v input voltage v in -0.3 to v cc v allowable power dissipation pd max m ounted on the specified pcb* 1.2 w operating temperature topg -20 to + 85 c storage temperature tstg -40 to + 150 c note * : specified pcb : 114.3 76.1 1.6mm monolithic digital ic pwm constant current control 1-2 phase excitation stepping motor driver orderin g numbe r : en7947b
lb11948t no.7947-2/13 recommended operating conditions at ta = 25 c parameter symbol conditions ratings unit vs supply voltage vs 3.0 to 15 v v cc supply voltage v cc 3.0 to 15 v v cc 4v 0.0 to 1.0 v reference voltage vref v cc > 4v 0.0 to 1.5 v electrical characteristics ta = 25 c, vs = v cc = 5v, vref = 0.3v ratings parameter symbol conditions min typ max unit [output block] i vs off ph1 = ph2 = 0v, en1 = en2 = 3.0v, st = 3.0v 5 a i vs on ph1 = ph2 = en1 = en2 = 0v, st = 3.0v 28 40 52 ma vs system supply current i vs wt ph1 = ph2 = en1 = en2 = st = 0v 1 a output saturation voltage 1 v o (sat) 1 i o = +0.2a (source) 0.2 0.4 v output saturation voltage 2 v o (sat) 2 i o = +0.4a (source) 0.3 0.5 v output saturation voltage 3 v o (sat) 3 i o = -0.2a (sink) 0.2 0.4 v output saturation voltage 4 v o (sat) 4 i o = -0.4a (sink) 0.3 0.5 v i o 1 (leak) v o = v bb (sink) 50 a output leakage current i o 2 (leak) v o = 0v (source) -50 a upper and lower side output diodes forward voltage 1 (upper side) vf1 i = 400ma 0.9 1.1 1.3 v forward voltage 2 (lower side) vf2 i = 400ma 0.9 1.1 1.3 v [logic block] i cc off ph1 = ph2 = 0v, en1 = en2 = 3.0v, st = 3.0v 6.5 10 13.5 ma i cc on ph1 = ph2 = en1 = en2 = 0v, st = 3.0v 7 11 15 ma v cc system supply current i cc wt ph1 = ph2 = en1 = en2 = st = 0v 1 a v i on 2.0 v input voltage v i off 0.8 v input current i in v in = 5v 70 100 130 a reference voltage : 1v v1v i o = 1ma 0.95 1 1.05 v current setting reactive current ie -22 -17 -10.5 ma reference current iref vref = 0.3v, ve = 0.3v -1 a cr pin current 1 icr1 cr = 0.5v -2 a cr pin current 2 icr2 cr = 3v 1.65 2.2 2.75 ma sense voltage 1 vsen1 vref = 0.5v 0.475 0.5 0.525 v thermal shutdown temperature * ts * 170 c note * : design guarantee value truth table channel 1 channel 2 input input output input output st phase1 enable1 out1 - out1 phase2 enable2 out2 - out2 h l l h l l l h l h h l l h h l l h h * h off off * h off off l * * off off * * off off note * : levels shown as an asterisk (*) can be set to be either high or low.
lb11948t no.7947-3/13 package dimensions unit : mm (typ) 3259 pin assignment top view sanyo : tssop30(275mil) 7.6 5.6 0.65 (1.0) 9.75 0.5 0.15 1 15 30 16 0.22 (0.33) 0.08 1.2max pd max -- ta ambient temperature, ta ? c allowable power dissipation, pd max ? w 0 0.8 1.0 1.2 0.6 0.4 0.2 1.4 ? 20 80 85 0.62 60 20 40 01 0 0 specified pcb : 114.3 76.11.6mm pcb material : glass epoxy
lb11948t no.7947-4/13 pin functions pin no. pin name description 1 out1 - output 2 out1 output 3 nc unused 4 nc unused 5 d-gnd lower side internal diode anode connection 6 e1 constant current control sensing the motor current is set by the value of the sensing resistor re connected between the e1 pin and ground. the current is set according to the following equation : i o = vref/re (a) 7 vs1 vs power supply 8 nc unused 9 v cc v cc power supply 10 cr rc oscillator connection 11 vref1 current setting syst em reference voltage input vref1 voltage range : 0 to 0.5v 12 nc unused 13 enable1 output is turned on when enable1 is low, and the output is turned off (operating state) when enable1 is high. 14 phase1 logic level input : phase switching when phase1 = high : output pin states : out1 : high, out1 - : low. when phase1 = low : output pin states : out1 : low, out1 - : high. 15 st standby mode setting when st = high : the ic operates in normal operating mode. when st = low : the ic operates in standby mode. the vs and v cc current drain levels are under 1 a in this mode. 16 nc unused 17 1vreg 1v regulator circuit output the lb11948 includes an internal 1v regulator circuit, and this pin is the output from that circuit. the vref1 and vref2 reference voltages can be set by voltage dividing the 1v regulator output. 18 phase2 logic level input : phase switching when phase2 = high : output pin states : out2 : high, out2 - : low. when phase2 = low : output pin states : out2 : low, out2 - : high. 19 enable2 output is turned on when enable2 is low, and the output is turned off (operating state) when enable2 is high. 20 vref2 current setting reference voltage input vref2 voltage range : 0 to 0.5v 21 gnd ground (small signal circuit system ground) 22 pgnd power system ground (high current circuit system ground) 23 nc unused 24 vs2 vs power supply 25 e2 constant current control sensing the motor current is set by the value of the sensing resistor re connected between the e2 pin and ground. the current is set according to the following equation : i o = vref/re (a) 26 d-gnd2 lower side internal diode anode connection 27 nc unused 28 nc unused 29 out2 output 30 out2 - output
lb11948t no.7947-5/13 block diagram enable1 phase1 enable2 out2 out2- out1- out1 10f v cc stepping motor phase2 vs2 vs1 e2 e1 p-gnd p-gnd s-gnd thermal shutdown circuit 1vreg cr - + - + v cc osc st vref1 vref2 1 1 30k 10k 56k 680pf blanking time blanking time reference voltage 10f control block
lb11948t no.7947-6/13 sample application circuit logic level input logic level input phase2 200 hz logic level input lb11948t 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 out1 - out1 nc nc d-gnd e1 vs1 nc v cc cr vref1 nc enable1 phase1 st 1vreg phase2 enable2 vref2 gnd pgnd nc vs2 e2 d-gnd2 nc nc out2 out2 - 10 f 8v 56k 680pf 30k 5v 10 f 1 1 phase1 90 deg 10k m
lb11948t no.7947-7/13 drive sequence table 2 phase excitation drive sequence table 1 clockwise drive no. phase1 enable1 out1 out1 - phase2 enable2 out2 out2 - 0 0 0 0 1 0 0 0 1 1 1 0 1 0 0 0 0 1 2 1 0 1 0 1 0 1 0 3 0 0 0 1 1 0 1 0 table 2 counterclockwise drive no. phase1 enable1 out1 out1 - phase2 enable2 out2 out2 - 0 0 0 0 1 1 0 1 0 1 1 0 1 0 1 0 1 0 2 1 0 1 0 0 0 0 1 3 0 0 0 1 0 0 0 1 1-2 phase excitation drive sequence table 3 clockwise drive no. phase1 enable1 out1 out1 - phase2 enable2 out2 out2 - 0 0 0 0 1 0 1 off off 1 0 0 0 1 0 0 0 1 2 1 1 off off 0 0 0 1 3 1 0 1 0 0 0 0 1 4 1 0 1 0 1 1 off off 5 1 0 1 0 1 0 1 0 6 0 1 off off 1 0 1 0 7 0 0 0 1 1 0 1 0 table 4 counterclockwise drive no. phase1 enable1 out1 out1 - phase2 enable2 out2 out2 - 0 0 0 0 1 1 1 off off 1 0 0 0 1 1 0 1 0 2 1 1 off off 1 0 1 0 3 1 0 1 0 1 0 1 0 4 1 0 1 0 0 1 off off 5 1 0 1 0 0 0 0 1 6 0 1 off off 0 0 0 1 7 0 0 0 1 0 0 0 1
lb11948t no.7947-8/13 2 phase excitation drive sequence phase1 clockwise drive 01 23 45 67 enable1 enable2 phase2 out1 out2 - out1 - out2 phase1 counterclockwise drive 01 23 45 67 enable1 enable2 phase2 out1 out2 - out1 - out2
lb11948t no.7947-9/13 1-2 phase excitation drive sequence phase1 clockwise drive 01234567 out1 enable1 out1 - enable2 phase2 out2 - : output off state out2 phase1 clockwise drive 01234567 out1 enable1 out1 - enable2 phase2 out2 - : output off state out2
lb11948t no.7947-10/13 switching operation timing chart outa outa i o e1 cr tn spike noise tn: the noise canceller operating time
lb11948t no.7947-11/13 usage notes (1) simple formulas for determining resister and capacitor values the formula for setting the rising time (t1) and the falling time (t2) for the rc oscillator are shown below. (refer to fig. 1) fig. 1 formulas oscillation period t = t1+t2 (sec) threshold voltages v1 = ((v cc - vset1) 10.7k/48.7k) + vset1 (v) v2 = ((v cc - vset2) 42.7k/80.7k) + vset2 (v) vset1 : vce voltage of transistor for internal comparator hysteresis = 0.05v vset2 : vce voltage of referen ce resistance switching transistor of oscillation circuit = 0.1v when charging : t1 = -c r ln {(v cc - v2)/(v cc - v1)} (sec) when discharging : t2 = -c rin ln (v1/v2) (sec) rin : internal discharge re sistance of the cr pin1.3k c : external capacitor r : external resistor oscillation frequency fc = 1/t (hz) the t2 fall time serves as the noise can celing time (tn). this time is a forced-on time for the output, and the output is not turned off even when the e pin voltage is higher than the sense voltage that has been preset by vref. t2 t1 v1 v2
lb11948t no.7947-12/13 (2) constant current settings the reference voltages of the vref1 and vref2 pins can be set by dividing the resistance voltage from the 1v regulator output pin (1vreg). the output current is set using the vref reference voltage applied to the vref1 and vref2 pins and the re resistor connected between the e1 and e2 pins and ground. the bias current of the output transistor also flows from the e pins so that the iout output current flowing to the motor is reduced by an amount e quivalent to the bias current. in addition, in controlling the constant curr ent, the voltage is sensed by the e pins (pad area on ic chip) so that the amount equivalent to the wire bonding resistance (rw) from the pad to the package pins is added to the current sensing resistance (re). therefore, the formula for calculating the current setting is as shown below. (refer to fig. 2) i out = vref / (re + rw) - ibias [a] re : sensing resistance of resistor connected between e pins and ground rw : amount equivalent to wire bonding resistance from pad to pins rw = 50 - 100m ibias : output transistor bias current the ibias current corresponds to the current setting reactiv e current (ie) in the specifications for the electrical characteristics. current setting reactive current ie ratings : min : -22ma typ : -17ma max : -10.5ma fig. 2 (3) vref pins the vref pins are the reference voltage input pins for the pr eset current, so take special care to ensure that they are not affected by noise. if these pins will be affected by noise, connect a capacitor to vref1 and vref2 pins. (4) notes on the ground pins since this ic switches large currents, the following notes on ground lines must be observed. ? the pcb pattern lines in areas that handle large currents must be as wide as possible so as to have low impedances, and must be kept as far as possible from the small signal systems. ? the ground terminals on the sensing resistors re connected to the e pins (e1 and e2) must be connected as close as possible to the ic gnd (pin 21), pgnd (pin 22), or dgnd (pins 5 and 26) pins as possible. ? the capacitors between v cc and ground and between v bb and ground must be as close as possible to the corresponding v cc and v bb pin in the pattern. vref re ic e1 pin ic vref1 pin i o ibias sense current : ie = i o +ibias wire (rw)
lb11948t ps no.7947-13/13 sanyo semiconductor co.,ltd. assumes no responsib ility for equipment failures that result from using products at values that exceed, even momentarily, rate d values (such as maximum ra tings, operating condition ranges, or other parameters) listed in products specif ications of any and all sanyo semiconductor co.,ltd. products described or contained herein. sanyo semiconductor co.,ltd. strives to supply high-qual ity high-reliability products, however, any and all semiconductor products fail or malfunction with some probability. it is possible that these probabilistic failures or malfunction could give rise to acci dents or events that could endanger human lives, trouble that could give rise to smoke or fire, or accidents that could cause dam age to other property. when designing equipment, adopt safety measures so that these kinds of accidents or e vents cannot occur. such measures include but are not limited to protective circuits and error prevention c ircuits for safe design, redundant design, and structural design. upon using the technical information or products descri bed herein, neither warranty nor license shall be granted with regard to intellectual property rights or any other rights of sanyo semiconductor co.,ltd. or any third party. sanyo semiconductor co.,ltd. shall not be liable f or any claim or suits with regard to a third party's intellctual property rights which has resulted from the use of the technical information and products mentioned above. information (including circuit diagr ams and circuit parameters) herein is for example only; it is not guaranteed for volume production. any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. when designing equi pment, refer to the "delivery specification" for the sanyo semiconductor co.,ltd. product that you intend to use. in the event that any or all sanyo semiconductor c o.,ltd. products described or contained herein are controlled under any of applicable local export control laws and regulations, such products may require the export license from the authorities conc erned 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 in formation storage or retrieval system, or otherwise, without the prior written consent of sanyo semiconductor co.,ltd. this catalog provides information as of december, 2007. specifications and inform ation herein are subject to change without notice.

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