60607 ms im / n2502 as (ot) no.7193-1/4 LB1941T overview the LB1941T is a single-channel forward/reverse driver ic that provides a constant cu rrent control function. its low-saturation output makes it appropriate for voice coil motor control, and it is optimal for use as the shutter driver ic in digital cameras. functions ? constant current control (i o = 400ma when rf = 0.5 ? ) ? ultraminiature package (msop8: 150mil) ? built-in thermal protection circuit ? includes a rapid charge/rapid discharge circuit for stable shutter operation. ? built-in reference voltage circuit (0.2v typical) specifications absolute maximum ratings at ta = 25 c parameter symbol conditions ratings unit maximum supply voltage v cc max -0.3 to +10.5 v output current i o max 600 ma output applied voltage v o max -0.3 to v cc +0.3 v input applied voltage v in max in1, in2 -0.3 to +10.5 v allowable power dissipation pd max mounted on a specified board.* 400 mw operating temperature topr -20 to +75 c storage temperature tstg -55 to +150 c note*: mounted on a board: 114.3mm 76.1mm 1.6mm, glass epoxy resin. monolithic linear ic for digital cameras constant current forward/reverse driver ic orderin g numbe r : en7193b 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. http://semicon.sanyo.com/en/network
LB1941T no.7193-2/4 allowable operating range at ta = 25c parameter symbol conditions ratings unit function-guaranteed voltage range vopr 2.5 to 10 v constant-current set range i out set with rfg-gnd resistance 50 to 500 ma input low level voltage v il in1, in2 -0.3 to +0.5 v input high level voltage v ih in1, in2 2.0 to 10 v electrical characteristics at ta = 25 c ratings parameter symbol conditions min typ max unit standby current dissipation i stb v cc = 8.5v 1.0 a constant-current h bridge drive circuit v o (sat)1 v cc = 3v, i o = 200ma (upper + lower side) 0.20 0.35 v output saturation voltage v o (sat)2 v cc = 4v, i o = 400ma (upper + lower side) 0.50 0.70 v output constant current i out v cc = 4v, r l = 3 , rf = 0.5 375 400 424 ma temperature dependence of output constant current (reference ta = 25c) i o v cc = 4v, r l = 3 , rf = 0.5 * (ta = ?10 to +60c) -2 +2 % operating current dissipation i cc v cc = 4v, r l = 0 , (no load, full drive) 14 21 ma thermal protection operating temperature tsd design target value * 150 180 210 c control input circuit i ih v ih = 5.5v, v cc = 5.5v 80 100 a control pin maximum input current i il v il = gnd -1 0 a note*: these items are design ta rget values and are not tested. package dimensions unit : mm (typ) 3245b sanyo : msop8(150mil) 3.0 1.1max 3.0 0.5 4.9 12 8 0.25 0.65 (0.53) (0.85) 0.125 0.08 020 --20 40 60 100 80 0 100 300 200 500 400 ilb01541 pd max - ta 192 ambient temperature, ta - c allowable power dissipation, pd max - mw specified board mounted on a board: 114.3mm 76.1mm 1 .6mm glass epoxy resin
LB1941T no.7193-3/4 pin assignment block diagram boost charge and discharge circuits in order to keep the output response time constant during mode transfer from the standby state to forward (reverse) rotation, this ic incorporates boost charge and discharge circuits for external capacitor connected to the fc pin. the external capacitor connected to the fc pin is for output phase compensation (to suppress oscillation), for which 0.01 to 0.1f is recommended. note that increase in the capacitor value results in increase in the time necessary for the constant current control to rise. v cc out1 out2 0.2v in2 gnd fc rfg rl rf 0.01 f in1 ilb01540 + -- c p u reference voltage thermal protection circuit boost charge circuit boost discharge circuit constant current control amplifier logic circuit in1 in2 fc gnd 8 v cc 7 out1 6 out2 5 rfg 1 2 3 4 top view LB1941T
LB1941T no.7193-4/4 truth table input output in1 in2 out1 out2 mode l l off off standby 1* h l h l forward rotation l h l h reverse rotation h h off off standby 2* cautions for use standby states 1 and 2 in the abov e truth table differ as follows: standby state 1 ............all circuits in ic are not operating and the current dissipation is almost zero. standby state 2 ............the constant-curre nt control amplifier output in ic is in the full drive condition. both out1 and out2 are off. the current dissipation is a few ma. during mode transfer from th e standby state 1 to forward (reverse) rotation, the current rises from the output current zero condition to the required constant current value. on the other hand, during mode transfer from the standby state 2 to forward (reverse) rotation, full driv e is applied once to the output, then the current lowers to the required current value. therefore, select the standby 1 state wh en putting ic in the standby state. a typical drive sequence is shown in the figure below. this catalog provides informati on as of june, 2007. specifications and information herein are subject to change without notice. sanyo semiconductor co.,ltd. assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rate d values (such as maximum ratings, 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-qu ality high-reliability pr oducts, however, any and all semiconductor products fail or malfunction with some proba bility. it is possible that these probabilistic failures or malfunction could give rise to accidents or events that could endanger human lives, trouble that could give rise to smoke or fire, or accidents that could cause damag e 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. upon using the technical information or products descr ibed 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 for 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 diagrams and circuit par ameters) 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 equipment, 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 co .,ltd. products described or contained herein are controlled under any of applicable local export control l aws and regulations, such products may require 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 consent of sanyo semiconductor co.,ltd. ps standby standb y reverserotation reverserotation fowardrotation in1 in2
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