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61213nk 20121220-s00002 / d0909 sy / 82609 ms pc 20090513-s00001 no.a1483-1/26 semiconductor components industries, llc, 2013 june, 2013 http://onsemi.com LV8732V overview the LV8732V is a 2-channel h-bridge driver ic that can switch a stepper motor driver, which supports micro-step drive with 1/8-step resolution, and two channels of a brushed motor driver, which supports forward, reverse, brake, and standby of a motor. it is ideally suited for driving brushed dc motors and stepper motors used in office equipment and amusement applications. function ? single-channel pwm current control stepper motor driver (s electable with dc motor driver channel 2) incorporated. ? bicdmos process ic ? low on resistance (upper side : 0.3 ; lower side : 0.25 ; total of upper and lower : 0.55 ; ta = 25 c, i o = 2a) ? micro-step mode can be set to full-step , half-step, quarter-step , or 1/8-step ? excitation step proceeds only by step signal input ? motor current selectable in four steps ? output short-circuit protection circuit (selectable from latch-type or auto-reset-type) incorporated ? unusual condition warning output pins ? no control power supply required specifications absolute maximum ratings at ta = 25 c parameter symbol conditions ratings unit supply voltage vm max vm , vm1 , vm2 36 v output peak current i o peak tw 10ms , duty 20% , per 1ch 2.5 a output current i o max per 1ch 2 a logic input voltage v in att1 , att2 , emm , rst/blk , step/dc22 fr/dc21 , md2/dc12 , md1/dc11 , dm , oe , st -0.3 to +6 v moni/emo input voltage vmoni/vemo -0.3 to +6 v allowable power dissipation pd max * 3.25 w operating temperature topr -20 to +85 c storage temperature tstg -55 to +150 c * specified circuit board : 90.0mm 90.0mm 1.6mm, glass epoxy 2-layer boar d, with backside mounting. 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. allowable operating ratings at ta = 25 c parameter symbol conditions ratings unit supply voltage range vm vm , vm1 , vm2 9 to 32 v logic input voltage v in att1 , att2 , emm , rst/blk , step/dc22 , fr/dc21 , md2/dc12 , md 1/dc11 , dm , oe , st 0 to 5.5 v vref input voltage range vref 0 to 3 v orderin g numbe r : ena1483b monolithic linear ic pwm constant-current control stepper motor 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 informa tion on page 26 of this data sheet.
LV8732V no.a1483-2/26 electrical characteristics at ta = 25c, vm = 24v, vref = 1.5v parameter symbol conditions ratings unit min typ max standby mode current drain imst st = ?l? , i(vm)+i(vm1)+i(vm2) 100 400 a current drain im st = ?h?, oe = ?l?, with no load , i(vm)+i(vm1)+i(vm2) 3.2 5 ma vreg5 output voltage vreg5 i o = -1ma 4.5 5 5.5 v thermal shutdown temperature tsd design guarantee 150 180 200 c thermal hysteresis width tsd design guarantee 40 c motor driver output on resistance ronu i o = 2a, upper-side on resistance 0.3 0.4 rond i o = 2a, lower-side on resistance 0.25 0.33 output leakage current i o leak 50 a diode forward voltage vd id = -2a 1.2 1.4 v logic pin input current i in l att1 , att2 , emm , rst/blk , step/dc22 , fr/dc21 , md2/dc12 , md1/dc11 , dm , oe , st , v in = 0.8v 48 12 a i in h v in = 5v 30 50 70 a logic input voltage high v in h att1 , att2 , emm , rst/blk , step/dc22 , fr/dc21 , md2/dc12 , md1/dc11 , dm , oe , st 2.0 5.5 v low v in l 0 0.8 v current setting comparator threshold voltage (current step switching) 1/8 step resolution vtdac0_2w step 0 (when initialized : channel 1 comparator level) 0.291 0.3 0.309 v vtdac1_2w step 1 (initial state+1) 0.285 0.294 0.303 v vtdac2_2w step 2 (initial state+2) 0.267 0.276 0.285 v vtdac3_2w step 3 (initial state+3) 0.240 0.249 0.258 v vtdac4_2w step 4 (initial state+4) 0.201 0.21 0.219 v vtdac5_2w step 5 (initial state+5) 0.157 0.165 0.173 v vtdac6_2w step 6 (initial state+6) 0.107 0.114 0.121 v vtdac7_2w step 7 (initial state+7) 0.053 0.06 0.067 v quarter step resolution vtdac0_w step 0 (when initialized : channel 1 comparator level) 0.291 0.3 0.309 v vtdac2_w step 2 (initial state+1) 0.267 0.276 0.285 v vtdac4_w step 4 (initial state+2) 0.201 0.21 0.219 v vtdac6_w step 6 (initial state+3) 0.107 0.114 0.121 v half step resolution vtdac0_h step 0 (when initialized : channel 1 comparator level) 0.291 0.3 0.309 v vtdac4_h step 4 (initial state+1) 0.201 0.21 0.219 v full step resolution vtdac4_f step 4' (when initialized : channel 1 comparator level) 0.291 0.3 0.309 v current setting comparator threshold voltage (current attenuation rate switching) vtatt00 att1 = l, att2 = l 0.291 0.3 0.309 v vtatt01 att1 = h, att2 = l 0.232 0.24 0.248 v vtatt10 att1 = l, att2 = h 0.143 0.15 0.157 v vtatt11 att1 = h, att2 = h 0.053 0.06 0.067 v chopping frequency fchop cchop = 200pf 40 50 60 khz chop pin charge/discharge current ichop 7 10 13 a chopping oscillation circuit threshold voltage vtup 0.8 1 1.2 v vtdown 0.4 0.5 0.6 vref pin input current ir ef vref = 1.5v -0.5 a moni pin saturation voltage vsatmon imoni = 1ma 400 mv charge pump vg output voltage vg 28 28.7 29.8 v rise time tong vg = 0.1 f , between cp1-cp2 0.1u f , st=?h? vg=vm+4v 200 500 s oscillator frequency fosc 90 125 150 khz continued on next page.
LV8732V no.a1483-3/26 continued from preceding page. parameter symbol conditions ratings unit min typ max output short-circuit protection emo pin saturation voltage vsatemo iemo = 1ma 400 mv cem pin charge current icem vcem = 0v 7 10 13 a cem pin threshold volt age vtcem 0.8 1 1.2 v package dimensions unit : mm (typ) 3333a 0 1.0 2.0 2.20 4.0 3.0 3.25 1.69 1.14 ? 20 40 60 80 20 0 100 ambient temperature, ta ? c allowable power dissipation, pd max ? w pd max ? ta two-layer circuit board 1 *1 two-layer circuit board 2 *2 *1 with components mounted on the exposed die-pad board *2 with no components mounted on the exposed die-pad board ssop44k(275mil) 15.0 7.6 (3.5) (4.7) 5.6 0.5 0.22 0.2 0.65 (0.68) 0.05 (1.5) 1.7 max top view side view side view bottom view 122 23 44
LV8732V no.a1483-4/26 substrate specifications (substrate recommended for operation of LV8732V) size : 90mm 90mm 1.6mm (two-layer substrate [2s0p]) material : glass epoxy copper wiring density : l1 = 85% / l2 = 90% l1 : copper wiring pattern diagram l2 : copper wiring pattern diagram cautions 1) the data for the case with the exposed die-pad substrate mounted shows the values when 90% or more of the exposed die-pad is wet. 2) for the set design, employ the derating design with sufficient margin. stresses to be derated include the voltage, current, junctio n temperature, power loss, and mechanical stresses such as vibration, impact, and tension. accordingly, the design must ensure these stresses to be as low or small as possible. the guideline for ordinary derating is shown below : (1)maximum value 80% or less for the voltage rating (2)maximum value 80% or less for the current rating (3)maximum value 80% or less for the temperature rating 3) after the set design, be sure to verify the design with the actual product. confirm the solder joint state and verify also the re liability of solder joint for the exposed die-pad, etc. any void or deterioration, if observed in the solder jo int of these parts, causes deteriorated thermal conduction, possibly resulting in thermal destruction of ic.
LV8732V no.a1483-5/26 pin assignment 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 out1 a vg out1 a vm pgnd cp2 nc cp1 nc vreg5 vm1 att2 vm1 att1 rf1 emo rf1 cem out1b emm out1b chop out2 a moni out2 a rst/blk rf2 step/dc22 rf2 fr/dc21 vm2 md2/dc12 vm2 md1/dc11 nc dm nc oe pgnd st out2b vref out2b gnd top view LV8732V
LV8732V no.a1483-6/26 block diagram att1 att2 emm dm cem emo oe rst/ blk step/ dc22 fr/ dc21 md2/ dc12 md1/ dc11 chop st tsd output control logic lvs vref gnd vreg5 moni charge pump regulator vm pgnd cf cp2 vg rf out a out b out2a out2b rf2 vm2 vm + - + - + - + - output preamplifier stage output preamplifier stage output preamplifier stage output preamplifier stage current selection (2w1-2/ w1-2/1-2/2) current selection (2w1-2/ w1-2/1-2/2) oscillation circuit attenuator (4 levels selectable)
LV8732V no.a1483-7/26 pin functions pin no. pin name pin function equivalent circuit 6 7 10 13 14 15 16 17 18 19 att2 att1 emm rst/blk step/dc22 fr/dc21 md2/dc12 md1/dc11 dm oe motor holding current switching pin. motor holding current switching pin. output short-circuit protection mode switching pin. reset input pin (stm) / blanking time switching pin (dcm). step signal input pin (stm) / channel 2 output control input pin 2 (dcm). cw / ccw signal input pin (stm) / channel 2 output control input pin 1 (dcm). excitation mode switching pin 2 (stm) / channel 1 output control input pin 2 (dcm). excitation mode switching pin 1 (stm) / channel 1 output control input pin 1 (dcm). drive mode (stm/dcm) switching pin. output enable signal input pin. vreg5 gnd 10k 100k 20 st chip enable pin. vreg5 gnd 10k 20k 80k 23, 24 25, 42 28, 29 30, 31 32, 33 34, 35 36, 37 38, 39 43, 44 out2b pgnd vm2 rf2 out2a out1b rf1 vm1 out1a channel 2 outb output pin. power system ground. channel 2 motor power supply connection pin. channel 2 current-sense resistor connection pin. channel 2 outa output pin. channel 1 outb output pin. channel 1 current-sense resistor connection pin. channel 1 motor power supply pin. channel 1 outa output pin. gnd 23 34 24 35 28 29 38 39 33 44 32 43 500 10k 500 36 37 30 31 42 25 continued on next page.
LV8732V no.a1483-8/26 continued from preceding page. pin no. pin name pin function equivalent circuit 1 2 3 4 vg vm cp2 cp1 charge pump capacitor connection pin. motor power supply connection pin. charge pump capacitor connection pin. charge pump capacitor connection pin. 100 gnd vreg5 4 3 2 1 21 vref constant current control reference voltage input pin. gnd vreg5 500 5 vreg5 internal power supply capacitor connection pin. 2k 78k 26k gnd vm 8 12 emo moni output short-circuit state warning output pin. position detection monitor pin. vreg5 gnd continued on next page.
LV8732V no.a1483-9/26 continued from preceding page. pin no. pin name pin function equivalent circuit 9 cem pin to connect the output short-circuit state detection time setting capacitor. gnd vreg5 11 chop chopping frequency setting capacitor connection pin. 500 500 gnd vreg5 22 gnd ground. 26, 27 40, 41 nc no connection (no internal connection to the ic)
LV8732V no.a1483-10/26 description of operation 1.input pin function 1-1) chip enable function this ic is switched between standby and operating mode by setting the st pin. in standby mode, the ic is set to power-save mode and all logic is reset. in addition, the internal regulator circuit and charge pump circuit do not operate in standby mode. st mode internal regulator charge pump low or open standby mode standby standby high operating mode operating operating 1-2) drive mode switching pin function the ic drive mode is switched by setting the dm pin. in stm mode, stepper motor channel 1 can be controlled by the clk-in input. in dcm mode, dc motor channel 2 or stepper motor channel 1 can be controlled by parallel input. stepper motor control using parallel input is full-step or half-step full torque. dm drive mode application low or open stm mode stepper motor channel 1 (clk-in) high dcm mode dc motor channel 2 or stepper motor channel 1 (parallel) 2.stm mode (dm = low or open) 2-1) step pin function input operating mode st stp low * standby mode high excitation step proceeds high excitation step is kept 2-2) excitation mode setting function md1 md2 micro-step resolution (excitation mode) initial position channel 1 channel 2 low low full step(2 phase excitation) 100% -100% high low half step(1-2 phase excitation) 100% 0% low high quarter step (w1-2 phase excitation) 100% 0% high high 1/8 step(2w1-2 phase excitation) 100% 0% this is the initial position of each excitation mode in th e initial state after power-on and when the counter is reset. 2-3) position detection monitoring function the moni position detection monitoring pin is of an open drain type. when the excitation position is in the initial positio n, the moni output is placed in the on state. (refer to "2-12.examples of current waveforms in each micro-step mode .")
LV8732V no.a1483-11/26 2- 4) setting constant-current control reference current this ic is designed to automatically exercise pwm constant-current chopping control for the motor current by setting the output current. based on the voltage input to the vr ef pin and the resistance conn ected between rf and gnd, the output current that is subject to the constant-current control is set using the calculation formula below : i out = (vref/5)/rf resistance * the above setting is the output current at 100% of each excitation mode. the voltage input to the vref pin can be switched to four-step settings depending on the statuses of the two inputs, att1 and att2. this is effective for reducing power consumption when motor holding current is supplied. attenuation function for vref input voltage att1 att2 current setting reference voltage attenuation ratio low low 100% high low 80% low high 50% high high 20% the formula used to calculate the output current when using the function for attenuating the vref input voltage is given below. i out = (vref/5) (attenuation ratio)/rf resistance example : at vref of 1.5v, a reference voltage setting of 100% [(att1, att2) = (l, l)] and an rf resistance of 0.3 , the output current is set as shown below. i out = 1.5v/5 100%/0.3 = 1.0a if, in this state, (att1, att2) is set to (h, h), iout will be as follows : i out = 1.0a 20% = 200ma in this way, the output current is attenuated when th e motor holding current is supplied so that power can be conserved. 2-5) input timing tsteph/tstepl : clock h/l pulse width (min 500ns) tds : data set-up time (min 500ns) tdh : data hold time (min 500ns) 2-6) blanking period if, when exercising pwm constant-current chopping control over the motor current, the mode is switched from decay to charge, the recovery current of the parasitic diode may fl ow to the current sensing resistance, causing noise to be carried on the current sensing resistance pin, and this ma y result in erroneous detection. to prevent this erroneous detection, a blanking period is provid ed to prevent the noise occurring during mode switching from being received. during this period, the mode is not switched from charge to decay even if noise is carried on the current sensing resistance pin. in the stepper motor driver mode (dm = low or open) of this ic, the blanking time is fixed at approximately 1 s. in the dc motor driver mode (dm = high), the blanking time can be switched to one of two levels using the rst/blk pin. (refer to "blanking time switching function.") step md1 md2 fr tsteph tstepl tds (md1 step) tdh (step md1) tds (md2 step) tdh (step md2) tds (fr step) tdh (step fr)
LV8732V no.a1483-12/26 2-7) reset function rst operating mode low normal operation high reset state when the rst pin is set to high, the excitation position of th e output is forcibly set to the initial state, and the moni output is placed in the on state. when rst is then set to low, the excitation position is advanced by the next step input. 2-8) output enable function oe operating mode low output on high output off when the oe pin is set high, the output is forced off and goes to high impedance. however, the internal logic circuits are operating, so the excitation position proceeds when the step signal is input. therefore, when oe is returned to low, the output leve l conforms to the excitation position proceeded by the step input. rst reset 0% step moni 1ch output 2ch output initial state oe power save mode 0% step moni 1ch output 2ch output output is high-impedance
LV8732V no.a1483-13/26 2-9) forward/reverse switching function fr operating mode low clockwise (cw) high counter-clockwise (ccw) the internal d/a converter proceeds by one bit at the rising edge of the input step pulse. in addition, cw and ccw mode are switched by setting the fr pin. in cw mode, the channel 2 current phase is delayed by 90 relative to the channel 1 current. in ccw mode, the channel 2 current phase is adva nced by 90 relative to the channel 1 current. 2-10) chopping frequency setting for constant-current control, this ic performs chopping operations at the frequency determined by the capacitor (cchop) connected between the chop pin and gnd. the chopping frequency is set as shown below by the capacitor (cchop) connected between the chop pin and gnd. fchop = ichop/ (cchop vtchop 2) (hz) ichop : capacitor charge/discharge current, typ 10 a vtchop : charge/discharge hysteresis voltage (vtup-vtdown), typ 0.5v for instance, when cchop is 200pf, the chopping frequency will be as follows : fchop = 10 a/ (200pf 0.5v 2) = 50khz fr cw mode cw mode ccw mode step excitation position 1ch output 2ch output (1) (2) (3) (4) (5) (6) (5) (4) (3) (4) (5)
LV8732V no.a1483-14/26 2-11) output current vector locus (one step is normalized to 90 degrees) setting current ration in each micro-step mode step 1/8 step (%) quarter step (%) half step (%) full step (%) channel 1 channel 2 channel 1 channel 2 channel 1 channel 2 channel 1 channel 2 0 100 0 100 0 100 0 1 98 20 2 92 38 92 38 3 83 55 4 70 70 70 70 70 70 100 100 5 55 83 6 38 92 38 92 7 20 98 8 0 100 0 100 0 100 channel 2 current ratio (%) 4' (2-phase) channel 1 phase current ratio (%) 0.0 33.3 66.7 100.0 0.0 33.3 66.7 100.0 0 1 3 5 6 7 8 2 4
LV8732V no.a1483-15/26 2-12) examples of current wave form in each micro-step mode full step (cw mode) half step (cw mode) step moni l1 (%) (%) -100 -100 100 100 0 0 i2 step moni i1 (%) -100 -100 100 (%) 100 0 0 i2
LV8732V no.a1483-16/26 quarter step (cw mode) 1/8 step (cw mode) step moni i1 (%) -100 -100 100 (%) 100 0 0 i2 step moni i1 -100 (%) 100 50 -50 0 i2 -100 (%) 100 50 -50 0
LV8732V no.a1483-17/26 2-13) current control operation specification (sine wave increasing direction) (sine wave decreasing direction) in each current mode, the operation sequence is as described below : ? at rise of chopping frequency, the charge mode begins. (in the time defined as the ?blanking time,? the charge mode is forced regardless of the magnitude of the coil current (icoil) and set current (iref).) ? the coil current (icoil) and set current (ir ef) are compared in this blanking time. when (icoil < iref) state exists ; the charge mode up to icoil iref, then followed by changeover to the slow decay mode, and finally by the fast decay mode for approximately 1 s. when (icoil < iref) state does not exist ; the fast decay mode begins. the coil current is a ttenuated in the fast decay mode till one cycle of chopping is over. above operations are repeated. normally, the slow (+fast) decay mode continues in the sine wave increasing direction, then entering the fast decay mode till the curren t is attenuated to the set level and followed by the slow decay mode. fast slow charge fast slow charge current mode fchop coil current step set current set current forced charge section forced charge section fast slow fast slow charge current mode fchop coil current step set current set current forced charge section charge
LV8732V no.a1483-18/26 3. dcm mode (dm-high) 3-1) dcm mode output control logic parallel input output mode dc11 (21) dc12 (22) out1 (2) a out1 (2) b low low off off standby high low high low cw (forward) low high low high ccw (reverse) high high low low brake 3-2) blanking time switching function blk blanking time low 2 s high 3 s 3-3) output enable function oe operating mode low output on high output off when the oe pin is set high, the output is forced off and goes to high impedance. when the oe pin is set low, output conforms to the control logic.
LV8732V no.a1483-19/26 3 - 4) current limit reference voltage setting function by setting a current limit, this ic automatically exercises short braking control to ensure that when the motor current has reached this limit, th e current will not exceed it. (current limit control time chart) the limit current is set as calculated on the basis of the vo ltage input to the vref pin and the resistance between the rf pin and gnd using the formula given below. ilimit = (vref/5) /rf resistance the voltage applied to the vref pin can be switched to any of the four setting levels depending on the statuses of the two inputs, att1 and att2. function for attenuating vref input voltage att1 att2 current setting reference voltage attenuation ratio low low 100% high low 80% low high 50% high high 20% the formula used to calculate the output current when using the function for attenuating the vref input voltage is given below. ilimit = (vref/5) (attenua tion ratio) /rf resistance example : at vref of 1.5v, a reference voltage setting of 100% [(att1, att2) = (l, l)] and an rf resistance of 0.3 , the output current is set as shown below. ilimit = 1.5v/5 100%/0.3 = 1.0a if, in this state, (att1, att2) has been set to (h, h), ilimit will be as follows : ilimit = 1.0a 20% = 200ma charge fchop forced charge section coil current set current current mode slow current mode
LV8732V no.a1483-20/26 3 - 5) examples of current waveform in each micr o-step mode when stepper motor parallel input control full step (cw mode) half step full torque (cw mode) dc11 dc12 dc21 dc22 i1 i2 (%) -100 -100 100 (%) 100 0 0 dc11 dc21 dc12 dc22 l1 l2 -100 -100 0 0 (%) 100 (%) 100
LV8732V no.a1483-21/26 4. output short-circuit protection function this ic incorporates an output short-circuit protection circu it that, when the output has been shorted by an event such as shorting to power or shorting to ground, sets the output to the standby mode and turns on the warning output in order to prevent the ic from being damaged. in the stepping motor driver (stm) mode (dm = low), this function sets the output to the standby mode for both channels by detecting the short-circuiting in one of the channels. in the dc motor driver mode (dm = high), channels 1 and 2 operate independently. (even if the output of channel 1 has been short-circuited, channe l 2 will operate normally.) 4-1) output short-circuit protection mode switching function output short-circuit protection mode of ic can be switched by the setting of emm pin . emm state low or open latch method high auto reset method 4-2) latch type in the latch mode, when the output current exceeds the detecti on current level, the output is turned off, and this state is held. the detection of the output short-circuited state by the ic causes the output short-circuit protection circuit to be activated. when the short-circuited state continues for the period of time set using the internal timer (approximately 2 s), the output in which the short-circuiting has been detected is firs t set to off. after this, the output is set to on again as soon as the timer latch time (tcem) described later has been exceeded, and if the short-circ uited state is still detected, all the outputs of the channel concerned are switched to the standby mode, and this state is held. this state is released by setting st to low. 2 s short-circuit short- circuit short-circuit detection state cem voltage h-bridge output state internal counter 1st counter start 1st counter stop 1st counter start 1st counter end 2nd counter start 2nd counter end release threshold voltage output off output on output on standby state
LV8732V no.a1483-22/26 4 - 3) auto reset type in the automatic reset mode, when the output current ex ceeds the detection current level, the output waveform changes to the switching waveform. as with the latch system, when the output short-circuited state is detected, the short-circuit protection circuit is activated. when the operation of the short-circuit detection circuit exceeds the timer latch time (tcem) described later, the output is changed over to the standby mode and is reset to the on mode again in 2ms (typ). in this event, if the over current mode still continues, the switching mode desc ribed above is repeated until the over current mode is canceled. 4-4) unusual condition warning output pins (emo, moni) the lv8731v is provided with the emo pin which notifies the cpu of an unusual condition if the protection circuit operates by detecting an unusual condition of the ic. this pin is of the open-drain output type and when an unusual condition is detected, the emo output is placed in the on (emo = low) state. in the dc motor driver mode (dm = high), the moni pin also functions as a warning output pin. the functions of the emo pin and moni pin change as shown below depending on the state of the dm pin. when the dm is low (stm mode) : emo : unusual condition warning output pin moni : excitation initial position detection monitoring when the dm is high (dcm) mode) : emo : channel 1 warning output pin moni : channel 2 warning output pin furthermore, the emo (moni) pin is placed in the on state when one of the following conditions occurs. 1. shorting-to-power, shorting-to-ground, or shorting-to-load occurs at the output pin and the output short-circuit protection circuit is activated. 2. the ic junction temperature rises and th e thermal protection circuit is activated. unusual condition dm = l (stm mode) dm = h (dcm mode) emo moni emo moni channel 1 short-circuit detected on - on - channel 2 short-circuit detected on - - on overheating condition detected on - on on 4-5) timer latch time (tcem) the time taken for the output to be set to off when the output has been short-circuited can be set using capacitor ccem, connected between the cem pin and gnd. the value of capacitor ccem is determ ined by the formula given below. timer latch : tcem tcem ccem vtcem/icem [sec] vtcem : comparator threshold voltage, typ 1v icem : cem pin charge current, typ 10 a 5. thermal shutdown function the thermal shutdown circuit is included, and the ou tput is turned off when junction temperature tj exceeds 180 c and the abnormal state warning output is turned on at the same time. when the temperature falls hysteresis level, ou tput is driven again (a utomatic restoration) the thermal shutdown circuit doesn?t guarantee protection of the set and the destruction prevention of ic, because it works at the temperature that is higher than rating (tjmax=150 c) of the junction temperature tsd = 180c (typ) ? tsd = 40c (typ)
LV8732V no.a1483-23/26 6. charge pump circuit when the st pin is set high, the charge pump circuit operat es and the vg pin voltage is boosted from the vm voltage to the vm + vreg5 voltage. if the vg pin voltage is not boosted to vm+4v or more, the output pin cannot be turned on. therefore it is recommended that the drive of motor is star ted after the time has passed tong or more. vg pin voltage schematic view tong st vm+vreg5 vm+4v vm vg pin voltage
LV8732V no.a1483-24/26 application circuit example ? stepping motor driver circuit (dm = low) the formulae for setting the constants in the examples of the application circuits above are as follows : constant current (100%) setting when vref = 1.5v i out = vref/5/rf resistance = 1.5v/5/0.22 = 1.36a chopping frequency setting fchop = ichop/ (cchop vtchop 2) = 10 a/ (200pf 0.5v 2) = 50khz timer latch time when the output is short-circuited tcem = ccem vtcem/icem = 100pf 1v/10 a = 10 s 0.1 f vg vm cp1 vreg5 att2 att1 emo cem emm chop moni rst/blk step/dc22 fr/dc21 md2/dc12 dm oe st vref gnd md1/dc11 cp2 out1a out1a nc nc vm1 vm1 rf1 rf1 out1b out1b out2a out2a rf2 rf2 vm2 nc nc pgnd out2b out2b vm2 pgnd 0.1 f 0.1 f 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 LV8732V +- 100pf 200pf 10 f 24v 1.5v 0.22 0.22 47k + - logic input clock input m short-circuit state detection monitor position detection monitor 47k
LV8732V no.a1483-25/26 ? dc motor driver circuit (dm = high, and the current limit function is in use.) the formulae for setting the constants in the examples of the application circuits above are as follows : constant current limit (100%) setting when vref = 1.5v ilimit = vref/5/rf resistance = 1.5v/5/0.22 = 1.36a chopping frequency setting fchop = ichop/ (cchop vtchop 2) = 10 a/ (200pf 0.5v 2) = 50khz timer latch time when the output is short-circuited tcem = ccem vtcem/icem = 100pf 1v/10 a = 10 s 0.1 f vg vm cp1 vreg5 att2 att1 emo cem emm chop moni rst/blk step/dc22 fr/dc21 md2/dc12 dm oe st vref gnd md1/dc11 cp2 out1a out1a nc nc vm1 vm1 rf1 rf1 out1b out1b out2a out2a rf2 rf2 vm2 nc nc pgnd out2b out2b vm2 pgnd 0.1 f 0.1 f 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 LV8732V +- 100pf 200pf 10 f 24v 1.5v 0.22 0.22 47k + - logic input m m channel 1 short-circuit state detection monitor channel 2 position detection monitor 47k
LV8732V ps no.a1483-26/26 ordering information device package shipping (qty / packing) LV8732V-tlm-h ssop44k (275mil) (pb-free / halogen free) 2000 / tape & reel LV8732V-mpb-h ssop44k (275mil) (pb-free / halogen free) 30 / fan-fold 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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