30712 sy 20111213-s00004 no.a2015-1/6 http://onsemi.com semiconductor components industries, llc, 2013 june, 2013 lb1948mc overview the lb1948mc is a two-channel low saturation voltage forward/ reverse motor driver ic. it is optimal for motor drive in 12v system products and can drive either two dc motors, one dc motor using parallel connection, or a two-phase bipolar stepping motor with 1-2 phase excitation mode drive. features ? supports 12v power supply systems ? low saturation voltage: v o (sat) = 0.5v (typical) at i o = 400ma ? zero current drawn in standby mode ? braking function ? supports parallel connection: i o max = 1.6a, v o (sat) = 0.6v (typical) at i o = 800ma ? built-in spark killer diode ? built-in thermal shutdown circuit ? miniature package: mfp-10s (6.4mm 5.0mm) specifications absolute maximum ratings at ta = 25 c parameter symbol conditions ratings unit maximum supply voltage v cc max -0.3 to +20 v output voltage v out -0.3 to +20 v input voltage v in -0.3 to +18 v ground pin source current i gnd per channel 800 ma allowable power dissipation pd max mounted on a specified board* 870 mw operating temperature topr -20 to +85 c storage temperature tstg -40 to +150 c * specified board: 114.3mm 76.1mm 1.6mm, glass epoxy board. caution 1) absolute maximum ratings represent the va lue which cannot be exceeded for any length of time. caution 2) even when the device is used within the range of abso lute maximum ratings, as a result of continuous usage under hig h temperature, high current, high voltage, or drastic temperature change, the reliability of th e ic may be degraded. please contact us for the further detai ls. monolithic digtal ic 12v low saturation voltage drive forward/reverse motor driver orderin g numbe r : ENA2015 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.
lb1948mc no.a2015-2/6 allowable operating range at ta = 25 c parameter symbol conditions ratings unit supply voltage vcc 2.5 to 16 v input high-level voltage v ih 1.8 to 10 v input low-level voltage v il -0.3 to +0.7 v electrical characteristics at ta = 25 c, v cc = 5v ratings parameter symbol conditions min typ max unit i cc 0 in1, 2, 3, 4 = 0v (standby mode) 0.1 10 a i cc 1 *1 (forward or reverse mode) 15 21 ma current drain i cc 2 *2 (brake mode) 30 40 ma v o (sat)1 i out = 200ma (high side and low side) 0.25 0.35 v output saturation voltage v o (sat)2 i out = 400ma (high side and low side) 0.50 0.75 v input current i in v in = 5v 85 110 a spark killer diode reverse current i s (leak) 30 a forward voltage v sf i out = 400ma 1.7 v *1:in1/in2/in3/in4=h/l/l/l or l/h/l/l or l/l/h/l or l/l/l/h. *2:in1/in2/in3/in4=h/h/l/l or l/l/h/h. package dimensions unit : mm (typ) 3420 pin assignment 1 v cc 2 in1 3 in2 4 in3 5 in4 10 9 8 7 6 out1 out2 out3 out4 gnd lb1948mc top view sanyo : mfp10sk(225mil) 1 10 2 0.8 max 1.55 1.0 0.35 5.0 0.15 6.2 (1.5) 0.05 4.4 0.5 -20 0 20 40 60 80 100 0 1.0 0.8 0.6 0.4 0.2 85 pd max -- ta 0.87 0.45 ambient temperature, ta -- c allowable power dissipation, pd max -- w specified board: 114.3 76.1 1.6mm 3 glass epoxy board.
lb1948mc no.a2015-3/6 truth table input output in1 in2 in3 in4 out1 out2 out3 out4 notes l l l l off off off off standby mode l l off off standby mode h l h l forward l h l h reverse h h l l 1ch brake l l off off standby mode h l h l forward l h l h reverse h h l l 2ch brake block diagram v cc in1 in2 in3 in4 out1 out2 out3 out4 gnd m m 60k 80k 60k 80k 60k 80k 60k 80k 10 f control block thermal shutdown circuit
lb1948mc no.a2015-4/6 design documentation (1) voltage magnitude relationship there are no restrictions on the magnitude relationships between the voltages applied to v cc and in1 to in4. (2) parallel connection the lb1948mc can be used as a single-channel h-bridge power supply by connecting in1 to in3, in2 to in4, out1 to out3, and out2 to out4 as shown in the figure. (i o max = 1.6a, v o (sat) = 0.6v (typical) at i o = 800ma) 1v cc 2 in1 3 in2 4 in3 5 in4 10 9 8 7 6 out1 out2 out3 out4 gnd lb1948mc m (3) observe the following points when designing the printed circuit board pattern layout. ? make the v cc and ground lines as wide and as short as possible to lower the wiring inductance. ? insert bypass capacitors between v cc and ground mounted as close as possible to the ic. ? resistors of about 10k must be inserted between the cpu output ports and the in1 to in4 pins if the microcontroller and the lb1948mc are mounted on different printed circuit boards and the ground potentials differ significantly. (4) penetration electric current at the time of the next mode shift, a penetration electric current is generated in v cc -gnd. there are not the deterioration of the ic by), the destruction as follo ws 1atyp per this penetration electric current (1ch, 1 s; but for the stabilization of the power supply line of the ic is most recent, and, please can enter with a condenser. (i) forward (reverse) ? brake (ii) forward ? reverse (iii) standby brake in addition, the penetration electric curre nt disappears when i put a wait mode of 10 s at the time of the change of the forward ? reverse. (5) supplementary matter of th e penetration electric current according to (4), a penetration elect ric current cannot influence ic life. thermal shutdown temperature (1) thermal shutdown temperature the thermal shutdown te mperature ttsd is 200 20 c with fluctuations. (2) thermal shutdown operation the operation of the thermal shut down circuit is shown in the figure below. when the chip temperature tj is in the direction of increasing (solid line), the output turns off at approximately 200 c. when the chip temperature tj is in the direction of decreasing (dotted line), the output turns on (returns) at approximately 125 c. 100 120 140 160 180 200 220 0 14 12 10 8 6 4 2 v cc = 12v 100 c 220 c 220 c 100 c return tsd operation chip temperature, tj -- c output voltage, v o -- v lb1948mc thermal shutdown reference chart
lb1948mc no.a2015-5/6 thermal shutdown circuit block diagram vref reference voltage circuit thermal shutdown circuit drive circuit function equivalent circuit note: the above is an example of therma l shutdown circuits although there are some differences from the actual internal circuit. thermal shutdown operation the thermal shutdown circuit compares the voltage of the he at sensitive element (diode) with the reference voltage and shuts off the drive circuit at a certain temperature to protect the ic chip from overheating. i cc -- v cc i in -- v in v o (sat) -- i o i cc -- ta 40 0 10 20 30 0 5 10 15 20 0 5 10 15 20 400 0 100 200 300 0.6 0 0.1 0.3 0.5 0.2 0.4 0 100 200 300 400 500 600 40 0 10 20 30 -40 -20 0 20 40 60 80 100 120 140 v in = 5v (= in1 / in2 or in3 / in4) h / h h / l, l /h l / l v cc = 12v in1~4 v cc = 12v v cc = 12v (in1 / 2) h /h h / l, l /h current drain, i cc -- ma supply voltage, v cc -- v input current, i in -- a input voltage, v in -- v output saturation voltage, v o (sat) -- v current drain, i cc -- ma output current, i o -- ma ambient temperature, ta -- c high side and low side
lb1948mc ps no.a2015-6/6 0 0.1 0.2 0.3 0.4 0.5 0.7 0.6 0 40 80 120 20 60 100 140 v cc = 12v high side and low side i o = 400ma 300ma 200ma 100ma v o (sat) -- ta -20 -40 output saturation voltage, v o (sat) -- v ambient temperature, ta -- c 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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