1/8 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. reversible motor drivers for brush motors 0.5a or less reversible motor drivers (single moter) bh6578fvm,bd7931f description the bh6578fvm and bd7931f are reversible motor drivers with a wide output dynamic range, with power mos used for the output transistor. the motor drivers can set the output mode to four modes of normal rotation, reverse rotation, stop (idling) , and braking in accordance with input logic (2 inputs). features 1) wide dynamic range loading driver with mos output, ron = 1.0 ? (top+bottom) 2) with loading driver voltage setting terminal 3) built-in thermal shutdown circuit (tsd) 4) msop8 package (bh6578fvm) 5) sop8 package (bd7931f) applications tray loading of cd/dvd, applications using dc motors absolute maximum ratings (ta=25 ) parameter symbol ratings unit bh6578fvm bd7931f supply voltage vcc 7 15 v power dissipation pd 0.55 * 0.69** w operating temperature topr -35 +85 -40 85 storage temperature tstg -55 +150 output current iout 500 ma junction temperature tjmax 150 * when 70 mmx70 mmx1.6 mm thick glass epoxy substrate with less than 3% copper foil occupancy ratio is mounted. when used at ta=25c or higher, derated at 4.4 mw/c. ** when 70 mmx70 mmx1.6 mm thick glass epoxy substrate with less than 3% copper foil occupancy ratio is mounted. when used at ta=25c or higher, derated at 5.5 mw/c. recommended operating range parameter symbol range unit bh6578fvm bd7931f supply voltage vcc 4.5~5.5 4.5 14 v truth table bh6578fvm,bd7931f input output function infwd inrev out+ out- l l hi z hi z high impedance l h l h rev mode h l h l fwd mode h h l l brake mode hiz hi-impedance no.11008ebt05
bh6578fvm,bd7931f technical note 2/8 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. electrical characteristics bh6578fvm(unless otherwise specified, ta=25 , vcc=5v) parameter symbol limits. unit conditions min. typ. max. standby current icc1 - 0.4 0.8 ma no load (loading driver) output offset voltage vofsl -15 0 +15 mv brake mode input threshold voltage h vih 2.0 vcc v input threshold voltage l vil gnd 0.5 v on resistance ron 1.0 1.8 ? io=500ma,top+bottom voltage gain (loading) gvld 4.5 6.0 7.5 db *1 voltage gain difference (loading) gvld -2.0 0 2.0 db input bias current iinl 86 120 a fin=5v,rin=5v ldcont bias current ildc 300 na cont=2v * no radiation-resistant design is adopted for the present product. *1. let v01 denote output-to-output voltage wh en cont=1v and v02 denote output-to-output voltage when cont=3.5v, voltage gain can be expressed by the following equation:gvld=20log|(v02-v01)/2.5| bd7931f(unless otherwise specified, ta=25 , vcc=8v) parameter symbol limits. unit conditions min. typ. max. standby current icc1 - 0 5 a supply current 1 icc2 - 1.1 2.2 ma fin=5v,rin=0v supply current 2 icc3 - 0.8 1.6 ma fin=rin=5v (loading driver) output offset voltage vofsl -35 0 +35 mv brake mode input threshold voltage h vih 2.0 vcc v input threshold voltage l vil gnd 0.5 v on resistance ron 1.0 1.8 ? io=500ma,top+bottom voltage gain (loading) gvld 4.0 6.0 8.0 db *2 voltage gain difference (loading) gvld -2.0 0 2.0 db input bias current iinl 165 250 a fin=5v,rin=5v ldcont bias current ildc 300 na cont=5v * no radiation-resistant design is adopted for the present product. *1. let v01 denote output-to-output voltage when cont=1v and v0 2 denote output-to-output voltage when cont=3.5v, voltage gain can be expressed by the following equation:gvld=20log|(v02-v01)/2.5|
bh6578fvm,bd7931f technical note 3/8 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. 0.0 0.1 0.2 0.3 0.4 0 100 200 300 400 500 load curr ent[ma] loss voltage[v ] 85 25 -35 0.0 0.1 0.2 0.3 0.4 0 100 200 300 400 500 load curr ent[ma] loss voltage[v ] 85 25 -35 0 1 2 3 4 5 012345 input voltag e : ldcont[v] output voltage[ v -35 25 85 0.0 0.1 0.2 0.3 0.4 0 100 200 300 400 500 load cur rent[ma] loss voltage[v ] 0.0 0.1 0.2 0.3 0.4 0 100 200 300 400 500 load cur rent[ma] loss voltage[v ] 0 2 4 6 8 10 012 345 input voltag e : ldcont[v] output voltage[ v -0.4 -0.3 -0.2 -0.1 0.0 0 100 200 300 400 500 load cur rent[ma] loss voltage[v ] -0.4 -0.3 -0.2 -0.1 0.0 0 100 200 300 400 500 load cur rent[ma] loss voltage[v ] -35 25 85 -0.4 -0.3 -0.2 -0.1 0.0 0 100 200 300 400 500 load cur rent[ma] loss voltage[v ] -0.4 -0.3 -0.2 -0.1 0.0 0 100 200 300 400 500 load cur rent[ma] loss voltage[v ] -10 -8 -6 -4 -2 0 012345 input voltag e : ldcont[v] output voltage[ v -5 -4 -3 -2 -1 0 01 23 45 input voltag e : ldcont[v] output voltage[ v 40 25 85 -40 25 85 85 25 -40 reference data fig.1 output loss voltage l(bh6578fvm ) fig.2 output loss voltage l(bh6578fvm) fig.3 voltage gain(bh6578fvm) vcc=5v, cont=open vcc=5v, co nt=open vcc=5v, cont=sweep fwd mode rev mode rl=8 +47h fig.4 output loss voltage h(bh6578fvm) fig.5 output loss voltage h(bh6578fvm) fig.6 voltage gain (bh6578fvm) vcc=5v, cont=open vcc=5v, co nt=open vcc=5v, cont=sweep fwd mode rev mode rl=8 +47h fig.7 output loss voltage l(bd7931f ) fig.8 output loss voltage l(bd7931f) fig.9 voltage gain (bd7931f) vcc=8v, cont=open vcc=8v, co nt=open vcc=8v, cont=sweep fwd mode rev mode rl=20 +47h fig.10 output loss voltage h(bd7931f) fig.11 output loss voltage h(bd7931f) fig.12 voltage gain(bd7931f) vcc=8v, cont=open vcc=8v, co nt=open vcc=8v, cont=sweep fwd mode rev mode rl=20 +47h -35 25 85 85 25 -35 85 25 -35 85 25 -35 40 25 85
bh6578fvm,bd7931f technical note 4/8 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. thermal derating curves bh6578fvm bd7931f *when 70 mmx70 mmx1.6 mm thick glass epoxy substrate with le ss than 3% copper foil o ccupancy ratio is mounted. block diagram, applied circuit diagram example bh6578fvm, bd7931f (in common) t. s . d : thermal shutdown fig.13 pin descriptions pin no. pin name function pin no. pinname function 1 vcc supply voltage 5 gnd_s signal ground 2 out+ fwd output 6 ldcont loading driver voltage setting pin 3 out- rev output 7 inrev rev input 4 gnd power ground 8 infwd fwd input a mbient temperature : ta [ ] 0 0 25 50 75 100 125 150 0.2 0.4 0.6 175 0.8 pd [w] pd : power dissipation 0 0 25 50 75 100 125 150 0.2 0.4 0.6 pd [w] 175 a mbient temperature : ta [ ] pd : power dissipation 0.8 1 2 3 4 8 7 6 5 control logic ldcont t. s . d + - fwd in rev in ldcont vcc f r pre gnd pow gnd powg pregnd pow cmos h-bridge m bypass capacitor 0.1 f 85 85
bh6578fvm,bd7931f technical note 5/8 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. interfaces bh6578fvm bd7931f fig.14 fig.17 fig.15 fig.16 fig.18 fig.19 operations (1) control logic operation of each mode is carried out as follows: when infwd is ?h? and inrev is ?l,? the normal rotation mode is achieved and current flows from out + to out - . when both infwd and inrev are ?h,? the brak e mode is achieved. operation in such event is described as follows: the top-side transistor turns off to stop supplying motor drive current, the bottom-side tr ansistor turns on to absorb reverse emf of motor and applies brake to motor. when both infwd and inrev are ?l,? out + and out - potentials become open and the motor stops. (2) loading cont controlling the output voltage can vary voltage applied to t he motor and can control the motor speed. by the voltage entered to the cont terminal, the output h voltage can be c ontrolled (gain 6db typ.). ev en if the voltage entered is increased more than necessary (vcc max), the output voltage never exceeds the power supply voltage. ldcont out+/out- fin/rin ldcont out+/out- infwd/inrev 50k? 50k ? 200k ? 7 8 50k ? 50k? 50k? 50k? 200k ? 7 8 vcc vcc 6 10k? 49.6k ? vcc 6 39k? 10k? 2 3 vcc 2 3 vcc
bh6578fvm,bd7931f technical note 6/8 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. notes for use (1) absolute maximum ratings in the event that applied voltage (vcc, vm), working temp erature range (topr), and other absolute maximum rating are exceeded, the ic may be destroyed. because it is unable to identify the short-circuit mode, open mode, etc., if any special mode is assumed, which exceeds the absolute maximum rating, physical safety measures are requested to be taken, such as fuses, etc. (2) reverse connection of power supply connector reverse connection of power supply connector may destroy t he ic. take necessary measures to protect the ic from reverse connection breakage such as externally inserting diodes across power supply and ic power supply terminal as well as across power supply and motor coil. (3) power supply line because return of current regenerated by reverse emf of a motor occurs, take necessary measures such as inserting capacitors across the power supply and gnd as a path for regenerated current, and determine the capacity value after thoroughly confirming that there would be no problems in various charac teristics such as capacitance drop at low temperature which may occur with electrolytic capacitors. (4) ground potential keep the gnd terminal potential to the minimum potential under any operating condition. in addition, check if there is actually any terminal which provides volt age below gnd including transient phenomena. (5) thermal design consider permissible dissipation (pd) under actual working cond ition and carry out thermal design with sufficient margin provided. (6) terminal-to-terminal short-circuit and erroneous mounting when the present ic is mounted to a print ed circuit board, take utmost care to di rection of ic and displacement. in the event that the ic is mounted erroneously, ic may be destroyed. in the ev ent of short-circuit caused by foreign matter that enters in a clearance between outputs or output and power-gnd, the ic may be destroyed. (7) operation in strong electromagnetic field the use of the present ic in the strong electromagnetic field may result in malo peration, to which care must be taken. (8) aso when ic is used, design in such a mann er that the output transistor to a motor does not exceed absolute maximum ratings and aso. (9) thermal shutdown circuit (tsd) (common) when junction temperature (tj) becomes thermal shutdown on temperature 175c, the thermal shutdown circuit (tsd circuit) is activated and driver output current is shorted. there is 25c temper ature hysteresis. the thermal shutdown protection circuit is first and foremost in tended for interrupt ic from thermal runa way, and is not intended to protect and warrant the ic. consequently, never attempt to continuously use the ic after this circuit is activated or to use the circuit with the activation of the circuit premised. (10) capacitor across output and gnd in the event a large capacitor is connected across output and gnd, when vcc and vin are short-circuited with 0v or gnd for some kind of reasons, current charged in the capaci tor flows into the output and may destroy the ic. use a capacitor smaller than 0.1 f between output and gnd. (11) inspection by set substrate in the event a capacitor is connected to a pin with low impedance at the time of in spection with a set substrate, there is a fear of applying stress to the ic. ther efore, be sure to discharge electricity for every process. furthermore, when the set substrate is connected to a jig in the inspection process, be sure to turn off power supply to connect the jig and be sure to turn off power supp ly to remove the jig. as electrostatic measures, provide grounding in the assembly process, and take utmost care in transportation and storage.
bh6578fvm,bd7931f technical note 7/8 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. (12) ic terminal input the present ic is a monolithic ic and has p + isolation and a p substrate between elements to separate elements. with this p layer and n layer of each element, pn junction is formed, and various parasitic elements are formed. for example, when resistors and transistors are connected to terminals as is the case of fi g.20, where in the case of resistor, the potential difference satisfies the relation of ground (gnd)>(terminal a) , and in the case of transistor (npn), the potential difference satisfies the relation of ground (gnd)>(terminal b), pn junction works as a diode. furthermore, in the case of transistor (npn), a parasiti c npn transistor operates by t he n-layer of other elements adjacent to the parasitic diode. the parasitic element is inev itably formed because of the ic construction. the operation of the parasitic element give s rise to mutual interference between circuits and results in malfunction, and eventually, breakdown. consequently, take utmost care not to use the ic to operate the parasitic element such as applying voltage lower than gnd (p substrate) to the input terminal. in addition, when the power supply voltage is not applied to ic, do not apply voltage to the input terminal, either. similarly, when the power supply voltage is applied, each input terminals shall be the voltage below the power supply voltage or within the guaranteed values of electrical properties. (13) gnd wiring pattern if there are a small signal gnd and a high cu rrent gnd, it is recommended to sepa rate the patterns for the high current gnd and the small signal gnd and provide a pr oper grounding to the reference point of the set not to affect the voltage at the small signal gnd with the change in voltage due to resi stance component of pattern wiring and high current. also for gnd wiring pattern of the component exter nally connected, pay specia l attention not to cause undesirable change to it. resistor transistor(npn) n n n p + p + p p-sub gnd terminal a n n p + p + p gnd c b e n gnd e b c gnd parasitic element fig.20 example of the basic structure of a bipolar ic terminal a terminal b terminal b parasitic element parasitic element parasitic element p-sub
bh6578fvm,bd7931f technical note 8/8 operating part numer b h 6 5 7 8 f v m - t r part no bh bd part no 6578 7931 package fvm : msop8 f : sop8 packaging and forming specification e2: embossed tape and reel (sop8) tr: embossed tape and reel (msop8) ? order quantity needs to be multiple of the minimum quantity. embossed carrier tape tape quantity direction of feed the direction is the 1pin of product is at the upper left when you hold reel on the left hand and you pull out the tape on the right hand 2500pcs e2 () direction of feed reel 1pin (unit : mm) sop8 0.90.15 0.3min 4 + 6 ? 4 0.17 +0.1 - 0.05 0.595 6 43 8 2 5 1 7 5.00.2 6.20.3 4.40.2 (max 5.35 include burr) 1.27 0.11 0.420.1 1.50.1 s 0.1 s direction of feed reel ? order quantity needs to be multiple of the minimum quantity. embossed carrier tape tape quantity direction of feed the direction is the 1pin of product is at the upper right when you hold reel on the left hand and you pull out the tape on the right hand 3000pcs tr () 1pin (unit : mm) msop8 0.08 s s 4.00.2 8 3 2.80.1 1 6 2.90.1 0.475 4 57 (max 3.25 include burr) 2 1pin mark 0.9max 0.750.05 0.65 0.080.05 0.22 +0.05 ?0.04 0.60.2 0.290.15 0.145 +0.05 ?0.03 4 + 6 ?4
r1120 a www.rohm.com ? 2011 rohm co., ltd. all rights reserved. notice rohm customer support system http://www.rohm.com/contact/ thank you for your accessing to rohm product informations. more detail product informations and catalogs are available, please contact us. notes no copying or reproduction of this document, in part or in whole, is permitted without the consent of rohm co.,ltd. the content specied herein is subject to change for improvement without notice. the content specied herein is for the purpose of introducing rohm's products (hereinafter "products"). if you wish to use any such product, please be sure to refer to the specications, which can be obtained from rohm upon request. examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the products. the peripheral conditions must be taken into account when designing circuits for mass production. great care was taken in ensuring the accuracy of the information specied in this document. however, should you incur any damage arising from any inaccuracy or misprint of such information, rohm shall bear no responsibility for such damage. the technical information specied herein is intended only to show the typical functions of and examples of application circuits for the produc ts. rohm does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by rohm and other parties. rohm shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. the products specied in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, ofce-automation equipment, commu- nication devices, electronic appliances and amusement devices). the products specied in this document are not designed to be radiation tolerant. while rohm always makes efforts to enhance the quality and reliability of its products, a product may fail or malfunction for a variety of reasons. please be sure to implement in your equipment using the products safety measures to guard against the possibility of physical injury, re or any other damage caused in the event of the failure of any product, such as derating, redundancy, re control and fail-safe designs. rohm shall bear no responsibility whatsoever for your use of any product outside of the prescribed scope or not in accordance with the instruction manual. the products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel- controller or other safety device). rohm shall bear no responsibility in any way for use of any of the products for the above special purposes. if a product is intended to be used for any such special purpose, please contact a rohm sales representative before purchasing. if you intend to export or ship overseas any product or technology specied herein that may be controlled under the foreign exchange and the foreign trade law, you will be required to obtain a license or permit under the law.
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