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d1504tn(ot) / 81004tn(ot) no.7947-1/12 ? any and all sanyo 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 representative nearest you before using any sanyo products described or contained herein in such applications. ? sanyo assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all sanyo products described or contained herein. sanyo electric co., ltd. semiconductor company tokyo office tokyo bldg., 1-10, 1 chome, ueno, taito-ku, tokyo, 110-8534 japan sanyo semiconductors data sheet LB11948T ? ? ? ? monolithic digital ic pwm constant current control 1-2 phase excitation stepping motor driver 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 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 s0.5a continuous output current i o max 0.4 a emitter output voltage ve 1.0 v input voltage vin ? 0.3 to v cc v allowable power dissipation pdmax mounted 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 1.6 mm 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 reference voltage v ref 0.0 to 0.5 v ordering number : enn7947 a
LB11948T no.7947-2/12 electrical characteristics at ta = 25c, v s = v cc = 5 v, v ref = 0.3 v ratings parameter symbol conditions min typ max unit [output block] i vs off ph1 = ph2 = 0 v, en1 = en2 = 3.0 v st = 3.0 v 5 a i vs on ph1 = ph2 = en1 = en2 = 0 v st = 3.0 v 28 40 52 ma v s system supply current i vs wt ph1 = ph2 = en1 = en2 = st = 0 v 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 = 0 v (source) ? 50 a upper and lower side output diodes forward voltage 1 (upper side) vf1 i = 400 ma 0.9 1.1 1.3 v forward voltage 2 (lower side) vf2 i = 400 ma 0.9 1.1 1.3 v [logic block] i cc off ph1 = ph2 = 0 v, en1 = en2 = 3.0 v st = 3.0 v 6.5 10 13.5 ma i cc on ph1 = ph2 = en1 = en2 = 0 v st = 3.0 v 7 11 15 ma v cc system supply current i cc wt ph1 = ph2 = en1 = en2 = st = 0 v 1 a vi on 2.0 v input voltage vi off 0.8 v input current i in vin = 5 v 70 100 130 a reference voltage: 1 v v1v i o = 1 ma 0.95 1 1.05 v current setting reactive current ie ? 22 ? 17 ? 10.5 ma reference current iref v ref = 0.3 v, ve = 0.3 v ? 1 a cr pin current 1 icr1 cr = 0.5 v ? 2 a cr pin current 2 icr2 cr = 3 v 1.65 2.2 2.75 ma sense voltage 1 vsen1 v ref = 0.5 v 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 outa ? outa phase2 enable2 outb ? outb hllhlllhl hhllhhllh h ? hoffoff ? hoffoff l ?? off off ?? off off note ? : levels shown as an asterisk ( ? ) can be set to be either high or low.
LB11948T no.7947-3/12 package dimensions unit: mm 3259 sanyo : tssop-30 (275mil) ambient temperature, ta -- c pd max -- ta allowable power dissipation, pd max -- w specified pcb: 114.3 76.1 1.6 mm pcb material: glass epoxy pin assignment top view
LB11948T no.7947-4/12 pin functions pin no. symbol functional descriptions 1out1 ? output 2 out1 output 3 nc unused 4 nc unused 5d ? gnd lower side internal diode anode connection 6e1 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 9v cc v cc power supply 10 cr rc oscillator connection 11 vref1 current setting system reference voltage input vref1 voltage range: 0 to 0.5 v 12 nc unused 13 enable1 logic level input the output is turned off when enable1 is low, and the outputs are turned on (operating state) when enable2 is high. 14 phase1 logic level input: phase switching when phase1 = high: output pin states: outa: high, outa-: low. when phase1 = low: output pin states: outa: low, outa-: 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 v s and v cc current drain levels are under 1 a in this mode. 16 nc unused 17 1vreg 1 v regulator circuit output the lb11948 includes an internal 1 v regulator circuit, and this pin is the output from that circuit. the vref1 and vref2 reference voltages can be set by voltage dividing the 1 v regulator output. 18 phase2 logic level input: phase switching when phase2 = high: output pin states: outa: high, outa-: low. when phase2 = low: output pin states: outa: low, outa-: high. 19 enable2 logic level input the output is turned off when enable1 is low, and the outputs are turned on (operating state) when enable2 is high. 20 vref2 current setting reference voltage input vref2 voltage range: 0 to 0.5 v 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 ? gnd lower side internal diode anode connection 27 nc unused 28 nc unused 29 out2 output 30 out2 ? output
LB11948T no.7947-5/12 block diagram thermal shutdown circuit reference voltage osc blanking time blanking time stepping motor 10 f 10 f enable1 phase1 enable2 phase2 st s-gnd control block vcc vs1 out1 out1- vs2 out2 out2- e1 e2 p-gnd p-gnd 1 ? 1 ? 56 k ? 30 k ? 10 k ? 680 pf vcc vref2 vref1 cr 1vreg _ + _ +
LB11948T no.7947-6/12 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 vcc cr vref1 nc enable1 phase1 st 1vreg phase2 enable2 vref2 gnd pgnd nc vs2 e2 d-gnd2 nc nc out2 out2- 10 f 8 v 56 k ? 680pf 30 k ? 5 v 10 f 1 ? 1 ? phase1 90 deg 10 k ? m
LB11948T no.7947-7/12 drive sequence table 2 phase excitation drive sequence table 1 clockwise drive no. phase1 enable1 out1 out1 ? phase2 enable2 out2 out2 ? 000010001 110100001 210101010 300011010 table 2 counterclockwise drive no. phase1 enable1 out1 out1 ? phase2 enable2 out2 out2 ? 000011010 110101010 210100001 300010001 1-2 phase excitation drive sequence table 3 clockwise drive no. phase1 enable1 out1 out1 ? phase2 enable2 out2 out2 ? 0000101offoff 100010001 211offoff0001 310100001 4101011offoff 510101010 601offoff1010 700011010 table 4 counterclockwise drive no. phase1 enable1 out1 out1 ? phase2 enable2 out2 out2 ? 0000111offoff 100011010 211offoff1010 310101010 4101001offoff 510100001 601offoff0001 700010001
LB11948T no.7947-8/12 2 phase excitation drive sequence clockwise drive 0 1 2 3 4 5 6 7 phase1 phase2 enable1 enable2 out1 out1- out2 out2- : output off state counterclockwise drive 0 1 2 3 4 5 6 7 phase1 phase2 enable1 enable2 out1 out1- out2 out2- : output off state
LB11948T no.7947-9/12 1-2 phase excitation drive sequence clockwise drive 0 1 2 3 4 5 6 7 phase1 phase2 enable1 enable2 out1 out1- out2 out2- : output off state counterclockwise drive 0 1 2 3 4 5 6 7 phase1 phase2 enable1 enable2 out1 out1- out2 out2- : output off state
LB11948T no.7947-10/12 switching operation timing chart outa outa i o e1 cr tn spike noise tn: the noise canceller operating time
LB11948T no.7947-11/12 usage notes simplified formulas for determining resistor and capacitor values the formulas for setting the rise time (t1) and the fall time (t2) for the rc oscillator are shown below. t1 0.44c ? r (s) t2 0.72 ? (c ? r ? 100)/(r + 1000) (s) set the oscillator frequency using the simplified formulas shown above. note that the t2 triangle wave fall time is the noise canceller circuit operating time. rc circuit waveform t1 t2 setting the constant current level the reference voltage vref1 and vref2 can be set by voltage dividing the 1 v regulator output. the output current is set by the voltage applied to the vref pins and the resistors re connected between the e1 and e2 pins and ground. the output current is set according to the following equation: i o = vref/re (a) vref voltage operating range: 0 to 1 v e1 pin voltage range: 0 to 1 v notes on the vref pins ? since the vref pins are the input pins for the reference voltage used to set the current, applications must be designed so that noise that could influence circuit operation does not occur at these pins. 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.
LB11948T no.7947-12/12 ? specifications of any and all sanyo 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's products or equipment. ? sanyo electric co., ltd. strives to supply high-quality high-reliab ility pr oducts. however, any and all semiconductor products fail with some probab ility. it is possible that these pr obab ilistic 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 products (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, of otherwise, without the prior written permission of sanyo electric co., ltd. ? any and all information described or contained herein are subject to change without notice due to produc t/tec hnology improvement, etc. when designing equipment, refer to the "delivery specification" for the sanyo product that you intend to use. ? information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. sanyo 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 th i ht f thi d ti this catalog provides information as of december, 2004. specifications and information herein are subject to change without notice.

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