d2013hk/d0512hk 20080624-s00002/d2706 msim/93004joim no.7232-1/8 http://onsemi.com semiconductor components industries, llc, 2013 december, 2013 lb1940t overview the lb1940t is 2-phase exciter type bipolar stepper motor driver ics that feature low-voltage, (supporting 3v battery) and low current operation with low saturation voltage . this ic 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 shutter, 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 dd = 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 (tssop20; 225mil; thickness (t) = 1.2mm 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 : en7232c monolithic digital ic 2-ch h-bridge constant current driver 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. ordering information see detailed ordering and shipping inform ation on page 8 of this data sheet.
lb1940t no.7232-2/8 allowable operating range at ta = 25 ? c parameter symbol conditions ratings unit min typ max function-guaranteed voltage range vopr1 v dd system, vs = 2.0v 1.9 6.5 v vopr2 vs system, v dd = 5.0v 1.6 7.5 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 parameter symbol conditions ratings unit min typ max 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 out output saturation voltage (at saturation control) v o (sat)1 v dd = 5.0v, vs = 2.0v i o = 200ma (pnp side) 0.20 0.30 v v o (sat)2 v dd = 5.0v, vs = 2.0v i o = 200ma (npn side) 0.10 0.15 v out output current (at constant cu rrent control) 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 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 control pin maximum input current i ih v ih = 5.5v 80 100 ? a i il v il = gnd -1 0 * for ra and rb, refer to application circuit diagram.
lb1940t no.7232-3/8 package dimensions unit : mm (typ) true table input output mode ena in out svdd 1 2 1 2 1 2 3 4 l l standby (current dissipation zero) h h l h on reverse rotation l h l on forward rotation h h l h on reverse rotation l h l on forward rotation a blank means ?don?t care?. a blank means ?off?. 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 no.7232-4/8 pin assignment pin description pin no. pin name description pin no. pin name description lb1940t lb1940t 1 vc1 reference voltage input for 1ch control 11 vs2 motor power supply (+) 2 s-gnd gnd for control system 12 out4 motor drive output 4 3 vc2 reference voltage input for 2ch control 13 rfg2 constant-current detection pin 4 vref reference voltage output 14 out3 motor drive output 3 5 ena1 signal input for 1ch control 15 out2 motor drive output 2 6 ena2 signal input for 2ch control 16 rf g1 constant-current detection pin 1 7 in1 signal input for 1ch control 17 out1 motor drive output 1 8 in2 signal input for 2ch control 18 v dd control system power supply (+) 9 fc1 c connection pin for 1ch phase compensation 19 svdd control system power output 10 fc2 c connection pin for 2ch phase compensation 20 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
lb1940t 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 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 (= 1.5 a) 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
lb1940t no.7232-7/8
lb1940t no.7232-8/8 ordering information device package shipping (qty / packing) LB1940T-MPB-E tssop20(225mil) (pb-free) 70 / fan-fold lb1940t-mpb-h tssop20(225mil) (pb-free / halogen free) 70 / fan-fold lb1940t-tlm-h tssop20(225mil) (pb-free / halogen free) 2000 / tape and reel ps 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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