d2706 ms im / 93004 jo im no.7232-1/8 lb1940t lb1940u overview the lb1940t and lb1940u are 2-phase exciter type bipolar stepping motor driver ic s that feature low-voltage, (supporting 3v battery) and low current operation with low sa turation voltage. these ics enable constant-current control of actuators, and are optimal for driving the actuators of pc peripherals such as usb compatible scanners, fdds, and printers, as well as for controlling the shutte r, iris, and af of a digital still camera. features ? low-voltage driving 2-power source type: vs = 1.6 to 7.5v, v dd = 1.9 to 6.5v single power source type: vs = v d d = 1.9 to 7.5v ? low saturation output: v o (sat) = 0.3v at i o of 200ma ? constant-current control ? built-in reference voltage (vref = 0.9v) ? small-sized, low-profile package (lb1940t: ts sop20; 225mil; thickness (t) = 1.2mm max.) (lb1940u: msop20; thickness (t) = 0.85mm max.) specifications absolute maximum ratings at ta = 25 c parameter symbol conditions ratings unit maximum supply voltage vb max vs1, vs2, v dd -0.3 to +10.5 v output applied voltage v out max out1, out2, out3, out4 -0.3 to +10.5 v output current i o max 400 ma input applied voltage v in max ena1, ena2, in1, in2, vc -0.3 to +10.5 v allowable power dissipation pd max mounted on a specified board * 800 mw operating temperature topr -20 to +85 c storage temperature tstg -55 to +150 c * mounted on a specified board: 114.3mm 76.1mm 1.6mm, glass epoxy ordering number : en7232a monolithic digital ic 2-ch h-bridge constant current 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 using any 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.
lb1940t/1940u no.7232-2/8 allowable operating range at ta = 25 c ratings parameter symbol conditions min typ max unit vopr1 v dd system, vs = 2.0v 1.9 6.5 function-guaranteed voltage range vopr2 vs system, v dd = 5.0v 1.6 7.5 v low level input threshold voltage v il ena1, ena2, in1, in2 -0.3 1.0 v high level input threshold voltage v ih ena1, ena2, in1, in2 2.0 6.0 v vc input voltage vc 0.19 1.0 v electrical characteristics at ta = 25 c, vs = 3v, v dd = 5v ratings parameter symbol conditions min typ max unit standby current dissipation istb vs = v dd = 6.5v 0.1 1.0 a regulator output circuit vref output voltage vref i ol = 0 to 1ma 0.85 0.9 0.95 v svdd output voltage vsvdd i ol = 10ma 4.70 4.85 v h bridge output circuit v o (sat)1 v dd = 5.0v, vs = 2.0v i o = 200ma (pnp side) 0.20 0.30 v out output saturation voltage (at saturation control) v o (sat)2 v dd = 5.0v, vs = 2.0v i o = 200ma (npn side) 0.10 0.15 v i out 1 v dd = 6.0v, vc = 0.2v, vs = 3.5v r l = 5 (between out-out), rfb = 2 94 100 106 ma out output current (at constant cu rrent control) i out 2 vc = rb ra rb + vref (ra = 70k , rb = 20k ) * v dd = 6.0v, vs = 2.0v r l = 5 (between out-out), rfb = 1 180 200 220 ma vs system operating current consumption is1 vc = rb ra rb + vref (ra = 70k , rb = 20k ) * 1.5 3 ma v dd system operating current dissipation i dd 1 vc = rb ra rb + vref (ra = 70k , rb = 20k ) * ena1 = 2v 4 7 ma vc input current ivc v dd = 6.0v, vs = 2.0v, vc = 1.9v 0 -1 a control input circuit i ih v ih = 5.5v 80 100 control pin maximum input current i il v il = gnd -1 0 a * for ra and rb, refer to application circuit diagram.
lb1940t/1940u no.7232-3/8 package dimensions package dimensions unit : mm (typ) unit : mm (typ) 3246 [lb1940t] 3262 [lb1940u] true table input output ena in out 1 2 1 2 1 2 3 4 svdd mode l l standby (current dissipation zero) h l h on reverse rotation h l h l on forward rotation h l h on reverse rotation h l h l on forward rotation a blank means ?don?t care?. a blank means ?off?. sanyo : msop20(225mil) 6.3 5.2 0.5 4.4 (0.35) (0.65) 0.5 0.125 1 10 20 11 0.2 0.08 0.85max sanyo : tssop20(225mil) 0.65 (0.3) 0.22 0.5 0.15 (1.0) 0.08 1.2max 6.4 4.4 6.5 1 10 20 11 020 --20 40 60 100 80 0 400 200 1000 800 800mw 600 ilb01486 pd max - ta allowable power dissipation, pd max - mw ambient temperature, ta- c mounted on a specified board: 114.3mm 76.1mm 1.6mm glass epoxy lb1940t/u
lb1940t/1940u no.7232-4/8 pin assignment pin description pin no. pin no. lb1940t lb1940u pin name description lb1940t lb1940u pin name description 1 20 vc1 reference voltage input for 1ch control 1 10 vs2 motor power supply (+) 2 19 s-gnd gnd for control system 2 9 out4 motor drive output 4 3 18 vc2 reference voltage input for 2ch control 3 8 rfg2 constant-current detection pin 4 17 vref reference voltage output 4 7 out3 motor drive output 3 5 16 ena1 signal input for 1ch control 5 6 out2 motor drive output 2 6 15 ena2 signal input for 2ch control 6 5 rfg1 constant-current detection pin 1 7 14 in1 signal input for 1ch control 7 4 out1 motor drive output 1 8 13 in2 signal input for 2ch control 8 3 v dd control system power supply (+) 9 12 fc1 c connection pin for 1ch phase compensation 9 2 svdd control system power output 10 11 fc2 c connection pin for 2ch phase compensation 10 1 vs1 motor power supply (+) 10 9 8 7 6 5 4 3 2 1 20 13 14 11 15 16 17 18 19 12 vc1 s-gnd vc2 vref ena1 ena2 in1 in2 fc1 fc2 vs2 out4 rfg2 out3 out2 rfg1 out1 v dd svdd vs1 top view lb1940t 20 13 14 15 16 17 18 19 12 vc1 s-gnd vc2 vref ena1 ena2 in1 in2 fc1 11 fc2 10 vs2 9 out4 8 rfg2 7 out3 6 out2 5 rfg1 4 out1 3 v dd 2 svdd 1 vs1 top view lb1940u
lb1940t/1940u no.7232-5/8 block diagram v dd -sw reference voltage logic circuit v dd vc1 vs1 out1 out2 vc2 + -- + -- out3 out4 vs2 fc2 rfg2 svdd v ref in2 ena1 in1 s-gnd fc1 rfg1 300 65k 80k 65k 80k 65k 80k 65k 80k ena2 300
lb1940t/1940u no.7232-6/8 application circuit diagram at constant-current control: the out curr ent is controlled so that the rfg pin voltage is equal to the vc input pin voltage. for example, i out = 200ma (= 0.2v/1 ) when vc = 0.2v and rfb = 1 . *: there is no priority relationship between respective input voltages (ena, in) and respective supply voltages (v dd , vs). for example, operation with v in = 5v, v dd = 3v, vs = 2v is possible. note: the input voltage range to the reference voltage input pin vc for constant-current setting is from 0.19v to 1.0v. constant current setting the composition of the constant-control circuit of this ic is as shown in the figure below. the voltage entered in the vc pin is entered as a reference to the ?+? side input of the constant-current control amplifier. the ?-? side of this constant-current control amplifier is connected to the rfg pin via the wire bonded resistor rb (= 0.1 ). the constant-current control circuit consists of comparison of the voltage generated at the external current detection resistor with the above reference voltage. in addition, since the bias current ib (= 1.5a) flows out of the positive (+) input of the constant current control amplifier during the constant current control, if the voltage is input to the vc pin by dividing the vref voltage by 4.5 according to the dividing resistance (70k and 20k ) as shown in the figure, the formula for calculating the vc voltage is as follows : vc = vref/4.5+ib 20k = vref/4.5+0.03 therefore, the theoretical equation to set the constant current i out is as follows: i out = vc/(rfb+rb) = (vref/4.5+0.03)/(rfb+rb) ena1 ena2 in1 in2 s - gnd svdd vref vc1 vc2 rfg1 rfg2 out1 out2 v dd vs2 vs1 out3 out4 cpu fc1 fc2 rfb rfb ra rb lb1940t lb1940u
lb1940t/1940u no.7232-7/8
lb1940t/1940u no.7232-8/8 ps this catalog provides i nformation as of december, 2006. specificati ons and information herein are subject to change without notice. specifications of any and all sanyo semiconductor pr oducts 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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