60607 ms im / n2502 as (ot) no.7193-1/4 http://onsemi.com semiconductor components industries, llc, 2013 june, 2013 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 co ntrol, 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 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.
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 0.1 f 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. ps standby standb y reverserotation reverserotation fowardrotation in1 in2 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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