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specifications of any and all sanyo semiconductor co.,ltd. products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer ' s products or equipment. to verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer ' s products or equipment. any and all sanyo semiconductor co.,ltd. products described or contained herein are, with regard to "standard application", intended for the use as general electronics equipment. the products mentioned herein shall not be intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee thereof. if you should intend to use our products for new introduction or other application different from current conditions on the usage of automotive device, communication device, office equipment, industrial equipment etc. , please consult with us about usage conditi on (temperature, operation time etc.) prior to the intended use. if there is no consultation or inquiry before the intended use, our customer shall be solely responsible for the use. o1911 sy 20110928-s00001 no.a1987-1/26 LV8736LF overview the LV8736LF is a 2-channel h-bridge driver ic that can switch a stepping motor driver, which is capable of micro-step drive and supports 2w 1-2 phase excitation, and two channels of a brushed motor driver, which supports forward, reverse, brake, and standby of a motor. it is ideally suited for dr iving brushed dc motors and stepping motors used in office equipment and amusement applications. features ? single-channel pwm current control stepping motor driver (selectable with dc motor driver channel 2) incorporated. ? bicdmos process ic ? low on resistance (upper side : 0.75 ; lower side : 0.5 ; total of upper and lower : 1.25 ; ta = 25 c, i o = 1a) ? excitation mode can be set to 2-phase, 1-2 phase, w1-2 phase , or 2w1-2 phase ? 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 ? built-in thermal shutdown circuit ? no control power supply required specifications absolute maximum ratings at ta = 25 c parameter symbol conditions ratings unit supply voltage vm max 36 v output peak current i o peak tw 10ms, duty 20% 1.5 a output current i o max 1a logic input voltage v in max -0.3 to +6 v moni/emo input voltage vmo/vemo -0.3 to +6 v continued on next page. bi-cmos lsi pwm constant-current control stepping motor driver orderin g numbe r : ena1987
LV8736LF no.a1987-2/26 continued from preceding page. parameter symbol conditions ratings unit allowable power dissipation pd max * 2.75 w operating temperature topr -20 to +85 c storage temperature tstg -55 to +150 c * specified circuit board : 57.0mm 57.0mm 1.6mm, glass epoxy 4-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 conditions at ta = 25 c parameter symbol conditions ratings unit supply voltage range vm 9 to 32 v logic input voltage v in 0 to 5.5 v vref input voltage range vref 0 to 3 v 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? 100 400 a current drain im st = ?h?, oe = ?l?, with no load 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 = 1a, upper-side on resistance 0.75 0.97 rond i o = 1a, lower-side on resistance 0.5 0.65 output leakage current i o leak 50 a diode forward voltage vd id = -1a 1.2 1.4 v logic high-level input voltage v in h 2.0 v logic low-level input voltage v in l 0.8 v logic pin input current other oe/cmk pin i in l v in = 0.8v 4 8 12 a i in h v in = 5v 30 50 70 a oe / cmk pin input current i cmk l dm = ?l?, oe/cmk = 0.8v 4 8 12 a i cmk h dm = ?l?, oe/cmk = 5v 30 50 70 a i cmk dm = ?h?, oe/cmk = 0v -32 -25 -18 a oe/cmk pin current limit mask threshold voltage. vt cmk dm = ?h? 1.2 1.5 1.8 v current setting comparator threshold voltage (current step switching) 2w1-2 phase drive 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 w1-2 phase drive 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 1-2 phase drive 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 2 phase drive vtdac4_f step 4' (when initialized : channel 1 comparator level) 0.291 0.3 0.309 v continued on next page.
LV8736LF no.a1987-3/26 continued from preceding page. parameter symbol conditions ratings unit min typ max 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 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 200 500 s oscillator frequency fosc 90 125 150 khz 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) 3415 sanyo : vqfn44l(6.0x6.0) 6.0 6.0 0.85 max 0.0 nom (0.8) top view side view side view bottom view (4.2) (3.0) 0.5 44 1 1 2 2 (1.0) 0.4 0.16
LV8736LF no.a1987-4/26 substrate specifications (substrate recommended for operation of LV8736LF) size : 57mm 57mm 1.6mm (4-layer substrate [2s2p]) material : glass epoxy copper wiring density : l1 = 75% / l4 = 85% l1 : copper wiring pattern diagram l4 : 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. pd max - ta 0 1.0 2.0 2.10 4.0 3.0 2.75 1.43 1.10 ? 20 40 60 80 20 0 100 ambient temperature, ta -c allowable power dissipation, pd max -w *1 with components mounted on the exposed die-pad board *2 with no components mounted on the exposed die-pad board *1 *2
LV8736LF no.a1987-5/26 block diagram att1 att2 emm dm cem emo oe/ cmk rst/ blk step/ dc22 fr/ dc21 md2/ dc12 md1/ dc11 chop st tsd lvs vref gnd vreg5 moni vm pgnd cp1 cp2 vg rf1 out1a out1b out2a out2b rf2 vm2 vm1 + - + - + - + - output control logic charge pump regulator current selection (2w1-2/ w1-2/1-2/2) current selection (2w1-2/ w1-2/1-2/2) oscillation circuit attenuator (4 levels selectable) output preamplifier stage output preamplifier stage output preamplifier stage output preamplifier stage current limit mask
LV8736LF no.a1987-6/26 pin assignment pin functions pin no. pin name pin function 17 vg charge pump capacitor connection pin. 18 vm motor power supply connection pin. 19 cp2 charge pump capacitor connection pin. 20 cp1 charge pump capacitor connection pin. 21 vreg5 internal power supply capacitor connection pin. 22 att2 motor holding current switching pin. 23 att1 motor holding current switching pin. 24 emo output short-circuit state warning output pin. 25 cem pin to connect the output short-circui t state detection time setting capacitor. 26 emm output short-circuit protection mode switching pin. 27 chop chopping frequency setting capacitor connection pin. 28 moni position detection monitor pin. 29 rst/blk reset input pin (stm) / bl anking time switching pin (dcm). 30 step/dc22 step signal input pin (stm) / c hannel 2 output control input pin 2 (dcm). 31 fr/dc21 cw / ccw signal input pin (stm) / channel 2 output control input pin 1 (dcm). 32 md2/dc12 excitation mode switching pin 2 (stm) / channel 1 output control input pin 2 (dcm). 33 md1/dc11 excitation mode switching pin 1 (stm) / channel 1 output control input pin 1 (dcm). 35 dm drive mode (stm/dcm) switching pin. 36 oe/cmk output enable signal input pin / current limit mask time setting capacitor connection pin. 37 st chip enable pin. 38 vref constant current contro l reference voltage input pin. 39 gnd ground. 40, 41 out2b channel 2 outb output pin. 43, 44 vm2 channel 2 motor power supply connection pin. 2, 3 rf2 channel 2 current-sense resistor connection pin. 5, 6 out2a channel 2 outa output pin. out1a vg out1a vm pgnd cp2 cp1 nc vreg5 vm1 att2 vm1 att1 emo rf1 out1b cem chop out2a moni rst/blk rf2 step/dc22 fr/dc21 vm2 md2/dc12 vm2 md1/dc11 dm nc oe/cmk pgnd st out2b vref out2b gnd top view LV8736LF 44 1 2 34 5 67 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 rf2 nc out2a out1b rf1 nc emm
LV8736LF no.a1987-7/26 continued on next page. continued from preceding page. pin no. pin name pin function 7, 8 out1b channel 1 outb output pin. 9, 10 rf1 channel 1 current-sense resistor connection pin. 12, 13 vm1 channel 1 motor power supply connection pin. 15, 16 out1a channel 1 outa output pin. 14, 42 pgnd power system ground. 1, 4, 11, 34 n.c. no connection. (no internal connection to the ic) equivalent circuit pin no. pin name equivalent circuit 22 23 26 29 30 31 32 33 35 att2 att1 emm rst/blk step/dc22 fr/dc21 md2/dc12 md1/dc11 dm vreg5 gnd 37 st vreg5 gnd 40, 41 14, 42 43, 44 2, 3 5, 6 7, 8 9, 10 12, 13 15, 16 out2b pgnd vm2 rf2 out2a out1b rf1 vm1 out1a gnd 7 40 8 41 12 13 43 44 16 6 15 5 2 3 9 10 42 14 continued on next page.
LV8736LF no.a1987-8/26 continued from preceding page. pin no. pin name equivalent circuit 17 18 19 20 vg vm cp2 cp1 gnd vreg5 20 19 18 17 38 vref gnd vreg5 21 vreg5 gnd vm 24 28 emo moni vreg5 gnd 25 cem gnd vreg5 continued on next page.
LV8736LF no.a1987-9/26 continued from preceding page. pin no. pin name equivalent circuit 27 chop gnd vreg5 36 oe/cmk vreg5 gnd
LV8736LF no.a1987-10/26 description of operation input pin function the function to prevent including the turn from the input to the power su pply is built into each input pin. therefore, the current turns to the power supply even if power supply (vm) is turned off with the voltage impressed to the input pin and there is not crowding. (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 (2) drive mode switching pin function the ic drive mode is switched by setting the dm pin. in stm mode, stepping motor channel 1 can be controlled by the clk-in input. in dcm mode, dc motor channel 2 or stepping motor channel 1 can be controlled by parallel input. stepping motor control using parallel input is 2-phase or 1-2 phase full torque. dm drive mode application low or open stm mode stepping motor channel 1 (clk-in) high dcm mode dc motor channel 2 or stepping motor channel 1 (parallel) stm mode (dm = low or open) (1) step pin function input operating mode st step low * standby mode high excitation step proceeds high excitation step is kept (2) excitation mode setting function md1 md2 excitation mode initial position channel 1 channel 2 low low 2 phase excitation 100% -100% high low 1-2 phase excitation 100% 0% low high w1-2 phase excitation 100% 0% high high 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. (3) position detection monitoring function the moni position detection monitoring pin is of an open drian type. when the excitation position is in the initial positi on, the moni output is placed in the on state. (refer to "examples of current waveforms in each of the excitation modes.")
LV8736LF no.a1987-11/26 (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 0.47 , the output current is set as shown below. i out = 1.5v/5 100%/0.47 = 0.64a if, in this state, (att1, att2) is se t to (h, h), iout will be as follows : i out = 0.64a 20% = 128ma in this way, the output current is attenuated when th e motor holding current is supplied so that power can be conserved. (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) (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 may result in erroneous detection. to prevent this erroneous detection, a blanking period is provided to prevent the noise occurr ing during mode switching from being received. during this period, the mode is not sw itched from charge to decay even if no ise is carried on the current sensing resistance pin. in the stepping 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)
LV8736LF no.a1987-12/26 (7) reset function only stm mode is pin at the dcm mode blk: it operat es as a switch function of the time of the bran king. 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. (8) output enable function only stm mode is pin at the dcm mode cmk: it operates as current limit mask 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 th e 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
LV8736LF no.a1987-13/26 (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. (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 180pf, the chopping frequency will be as follows : fchop = 10 a/ (180pf 0.5v 2) = 55khz 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)
LV8736LF no.a1987-14/26 (11) output current vector locus ( one step is normalized to 90 degrees) setting current ration in each excitation mode step 2w1-2 phase (%) w1-2 phase (%) 1-2 phase (%) 2-phase (%) 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
LV8736LF no.a1987-15/26 (12) typical current waveform in each excitation mode 2-phase excitation (cw mode) 1-2 phase excitation (cw mode) step moni l1 (%) (%) -100 -100 100 100 0 0 i2 step moni i1 (%) -100 -100 100 (%) 100 0 0 i2
LV8736LF no.a1987-16/26 w1-2 phase excitation (cw mode) 2w1-2 phase excitation (cw mode) step moni i1 -100 (%) 100 50 -50 0 i2 -100 (%) 100 50 -50 0 step moni i1 (%) -100 -100 100 (%) 100 0 0 i2
LV8736LF no.a1987-17/26 (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 chopping frequency 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 step fast slow fast slow charge step charge current mode coil current set current set current current mode coil current set current set current chopping cycle chopping cycle chopping cycle blanking section blanking section blanking section blanking section blanking section charge
LV8736LF no.a1987-18/26 dcm mode (dm-high) (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 (2) blanking time switching function only the dcm mode. at stm mode rst pin : it operates as reset function. blk blanking time low 2 s high 3 s (3) 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) (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 0.47 , the output current is set as shown below. ilimit = 1.5v/5 100%/0.47 = 0.64a if, in this state, (att1, att2) has been set to (h, h), ilimit will be as follows : ilimit = 0.64a 20% = 128ma charge slow coil current set current current mode chopping cycle blanking section
LV8736LF no.a1987-19/26 (4) current limit mask function only the dcm mode. at stm mode oe pin : it operates as output enable function. the mask can do current limit function during the fixed time set with the cmk pin at the dcm mode. it is effective to make it not hang to the limiter by the start current of the motor to set current limit low. the charge is begun, current limit function is done to the cmk capacitor meanwhile when switching to forward/ reverse mode, and the mask is done. afte rwards, the mask is released when the voltage of the cmk pin reaches set voltage (typ 1.5v), and the current limit function works. when 2ch side begins forward (reverse) operation while the mask on 1ch side is operating, the cmk pin is discharged one degree up to a constant voltage, and begins charging again because the cmk pin becomes 2ch using combinedly. meanwhile, 1ch side and 2ch side enter the state of the mask. when the capacitor is not connected, the function of limit in the current can be switched to operation/nonoperating state by the state of th e input of the cmk pin. cmk current limit function ?l? nonoperating ?h? or open operation (5) current limit mask time (tcmk) the time of the mask of current limit function can be set by connecting capacitor c cmk between cmk pin - gnd. decide the value of capacitor c cmk according to the follo wing expressions. mask time : t cmk t cmk -c cmk r 1n ( 1- vt cmk / (i cmk r )) (sec) vt cmk : limit mask threshold voltage typ 1.5v i cmk : cmk pin charge current typ 25 a r : internal resistance typ 100k 1.5v 0.3v 1ch operate 2ch operate cmk (capacitor) 1ch current limit 2ch current limit brake brake brake brake brake brake forward forward forward forward mask mask mask mask mask mask release release release release
LV8736LF no.a1987-20/26 (6) typical current waveform in each excitation mode when stepping motor parallel input control 2-phase excitation (cw mode) 1-2 phase excitation full torque (cw mode) dc11 dc12 dc21 dc22 i1 i2 (%) -100 -100 100 (%) 100 0 0 dc11 dc12 dc21 dc22 l1 l2 -100 -100 0 0 (%) 100 (%) 100
LV8736LF no.a1987-21/26 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, channel 2 will operate normally.) (1) output short-circuit protecti on operation changeover function changeover to the output short-circuit protection of ic is made by the setting of emm pin. emm state low or open latch method high auto reset method (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 conti nues 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. 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
LV8736LF no.a1987-22/26 (3) auto reset type in the automatic reset mode, when the output current exceeds 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 ci rcuit 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 overcurrent mode still continues, the switching mode desc ribed above is repeated until the overcurrent mode is canceled. (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 the 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 (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 overheating protection function the overheating protection circ uit is built into, and the output is turned off when junction temperature tj exceeds 180 c, and the abnormal state warning output is turned on at the same time. the value of hysteresis and when it falls, the temperature drives the output again (automatic restoration). the overheating protection ci rcuit doesn't secure protection and the destruction prevention of the set because it becomes operation by the area where ratings tjmax=150 c of the junction temperature was exceeded. tsd = 180 c (typ) tsd = 40 c (typ)
LV8736LF no.a1987-23/26 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. becau se the output is not turned on if vm+4v or more is not pressured, the voltage of the vg pin recommends the drive of the motor to put the time of t ong or more, and to begin. vg pin voltage schematic view tong st vm+vreg5 vm+4v vm vg pin voltage
LV8736LF no.a1987-24/26 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/5/0.47 = 0.64a chopping frequency setting fchop = ichop/ (cchop vtchop 2) = 10 a/ (180pf 0.5v 2) = 55khz timer latch time when the output is short-circuited tcem = ccem vtcem/icem = 100pf 1v/10 a = 10 s +- 100pf + - m out1a vg vm pgnd cp2 cp1 nc vreg5 vm1 att2 vm1 att1 emo rf1 out1b cem chop out2a moni rst/blk rf2 step/dc22 fr/dc21 md2/dc12 vm2 md1/dc11 dm oe/cmk pgnd st out2b vref out2b gnd LV8736LF 44 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 rf2 nc out1b rf1 nc emm nc vm2 out1a out2a 180pf 24v 1.5v logic input clock input short-circuit state detection monitor position detection monitor
LV8736LF no.a1987-25/26 ? dc motor 2 driver circuit (dm = high) 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/5/0.47 = 0.64a chopping frequency setting fchop = ichop/ (cchop vtchop 2) = 10 a/ (180pf 0.5v 2) = 55khz timer latch time when the output is short-circuited tcem = ccem vtcem/icem = 100pf 1v/10 a = 10 s current limit mask time tcmk=-ccmk r in(1-vtcmk/(icmk r)) =916 s +- 100pf + - out1a vg vm pgnd cp2 cp1 nc vreg5 vm1 att2 vm1 att1 emo rf1 out1b cem chop out2a moni rst/blk rf2 step/dc22 fr/dc21 md2/dc12 vm2 md1/dc11 dm oe/cmk pgnd st out2b vref out2b gnd LV8736LF 44 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 rf2 nc out1b rf1 nc emm nc vm2 out1a out2a 180pf 24v 1.5v m m logic input channel 1 short-circuit state detection monitor channel 2 short-circuit state detection monitor
LV8736LF ps no.a1987-26/26 this catalog provides information as of october, 2011. specifications and information herein are subject to change without notice. sanyo semiconductor co.,ltd. assumes no responsib ility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all sanyo semiconductor co.,ltd. products described or contained herein. sanyo semiconductor co.,ltd. strives to supply high-quality high-reliab ility pr oducts, however, any and all semiconductor products fail or malfunction with some probab ility. it is possible that these pr obab ilistic failures or malfunction could give rise to accidents or events that could endanger human lives, trouble that could give rise to smoke or fire, or accidents that could cause dam age to other property. when designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. upon using the technical information or products described herein, neither warranty nor license shall be granted with regard to intellectual property rights or any other rights of sanyo semiconductor co.,ltd. or any third party. sanyo semiconductor co.,ltd. shall not be liable for any claim or suits with regard to a third party's intellctual property rights which has resulted from the use of the technical information and products mentioned above. any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. when designing equip ment, refer to the "delivery specification" for the sanyo semiconductor co.,ltd. product that you intend to use. in the event that any or all sanyo semiconductor co.,ltd. products described or contained herein are controlled under any of applicable local export control laws and regulations, such products may require the export license from the authorities concerned in accordance with the above law. no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written consent of sanyo semiconductor co.,ltd.

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