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SLA7080M series description this document describes the function and features of SLA7080M series, which are unipolar 2-phase stepping motor driver ics. four levels of output current are available from the incorporated mosfets, corresponding to the rated output current ratings. all current ratings are available with protection against motor coil shorts or motor open wire detection. the SLA7080M series has a multichip structure, for enhanced thermal dispersion. the control ic (mic), four power elements (mosfet), and dual sense resistors, are all separate ics. built-in sense resistors for each phase allow accurate track- ing of performance without additional external components. low-power sleep mode as well as reduced power during pwm off-time maximize energy savings. features and benefits ? power supply voltage, v bb , 46 v maximum; 10 to 44 v normal operating range ? logic supply voltage, v dd , 3 to 5.5 v ? four output currents, i o (max) , options: 1, 1.5, 2, and 3 a ? stepping control for phase input (full or half step) ? built-in sense resistor detects motor current ? compact zip 23-pin molded package (sla package) ? self-excitation pwm control with fixed off-time ? built-in synchronous rectifying circuit reduces losses at pwm-off ? synchronous pwm function prevents noise generation in motor hold mode ? sleep function reduces power consumption of drivers in standby mode ? protection circuit detects motor coil open/short and prevents overheating due to avalanche breakdown ? externally-adjustable (3.2 s /5.2 s) blanking time (minimum on-time) unipolar 2-phase stepping motor driver ics functional block diagram package: 23-pin zip (type sla) not to scale logic block synchro control pwm control osc comp + - pre- driver protect pwm control osc pre- driver protect comp + - mic reg. outa outa outb outb outb outb outa outa vdd ref/sleep b_sel inb inb ina ina flag vbb senseb sensea gnd sync r s r s 28610.23
unipolar 2-phase stepping motor driver ics SLA7080M series 2 absolute maximum ratings, valid at t a = 25c characteristic symbol notes rating unit motor supply voltage v m 46 v main supply voltage v bb 46 v logic supply voltage v dd 6v output current i o SLA7080Mpr 1.0 a sla7081mpr 1.5 a sla7082mpr 2.0 a sla7083mpr 3.0 a logic input voltage v in ?0.3 to v dd + 0.3 v ref input voltage v ref ?0.3 to v dd + 0.3 v allowable power dissipation p d no heatsink 4.7 w maximum junction temperature t j (max) 150 oc nominal operating temperature t a ?20 to 85 oc storage temperature t stg ?30 to 150 oc all performance characteristics given are typical values for circuit or system baseline design only and are at the nominal operating voltage and an ambient temperature, t a , of 25c, unless oth er wise stated. selection guide part number output current (a) built-in sense resistor packing SLA7080Mpr 1 yes 18 pieces per tube sla7081mpr 1.5 sla7082mpr 2 sla7083mpr 3 recommended operating range characteristic symbol notes min max unit motor supply voltage v m ?44v main supply voltage v bb 10 44 v logic supply voltage v dd v dd surge voltage = 0.5 v 3.0 5.5 v case temperature t c without heatsink on pin 12, adjacent to case ?90oc with heatsink ? 80 oc allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
unipolar 2-phase stepping motor driver ics SLA7080M series 3 electrical characteristics valid at t a = 25c, v bb = 24 v and v dd = 5 v, unless otherwise noted characteristics symbol conditions min typ max units main supply current i bb in operation ? ? 15 ma i bbs sleep state ? ? 100 a logic supply current i dd ??5ma output mosfet on-resistance r ds(on) SLA7080Mpr ? 0.7 0.85 sla7081mpr ? 0.45 0.6 sla7082mpr ? 0.25 0.4 sla7083mpr ? 0.18 0.24 output mosfet diode forward voltage v f SLA7080Mpr ? 0.85 1.1 v sla7081mpr ? 1.0 1.25 v sla7082mpr ? 0.95 1.2 v sla7083mpr ? 0.95 2.1 v output mosfet breakdown voltage v dss v bb = 44 v, i d = 1 ma 100 ? ? v maximum response frequency f clk clock duty cycle = 50% 250 ? ? khz logic input voltage v il ?? v dd 0.25 v v ih v dd 0.75 ??v logic input current i il ?1? a i ih ?1? a ref input voltage v ref SLA7080Mpr 0.04 ? 0.3 v sla7081mpr, sla7083mpr 0.04 ? 0.45 v sla7082mpr 0.04 ? 0.4 v v refs sleep state (output off) 2.0 ? v dd v ref input current i ref ? 10 ? a sense detect voltage v sense v ref ? 0.03 v ref v ref + 0.03 v sense resistor 1 r s SLA7080Mpr, sla7081mpr 0.296 0.305 0.314 sla7082mpr 0.199 0.205 0.211 sla7083mpr 0.150 0.155 0.160 pwm minimum on-time (blanking time) t on(min) b_sel = low ? 3.2 ? s b_sel = high ? 5.2 ? s pwm off-time t off ?13? s sleep enable recovery time t se sleep state 100 ? ? s switching time t don phase inx phase outx on ? 1.5 ? s t doff phase inx phase outx off ? 1.0 ? s continued on the next page? allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
unipolar 2-phase stepping motor driver ics SLA7080M series 4 electrical characteristics (continued) valid at t a = 25c, v bb = 24 v and v dd = 5 v, unless otherwise noted characteristics symbol conditions min typ max units power derating chart allowable power dissipation, p d (w) ambient temperature, t a (c) 5 4 3 2 1 0 0 102030405060708090 r ja = 26.6c/w protection functions 2 overcurrent detect voltage v ocp at motor coil short circuit 0.65 0.7 0.75 v overcurrent detect current (v ocp / r s ) i ocp SLA7080Mpr, sla7081mpr ? 2.3 ? a sla7082mpr ? 3.5 ? a sla7083mpr ? 4.5 ? a delay to open load detect t opp 1.5 2.0 2.5 s overtemperature protection threshold temperature t tsd measured at back surface of device case; device operating such that self-generated heat has permeated detection circuits on mic; see thermal design section ? 140 ? c flag output voltage v flagl i flagl = 1.25 ma ? ? 1.25 v v flagh i flagh = ?1.25 ma v dd ? 1.25 ??v flag output current i flagl ? ? 1.25 ma i flagh ?1.25 ? ? ma 1 external sense resistor value approximately 5 m in addition to value of built-in resistor. 2 protection circuit operates when v sense v ocp . allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
unipolar 2-phase stepping motor driver ics SLA7080M series 5 performance characteristics at t a = 25c 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 ?25 0 25 50 75 100 125 v ds(on) (v) SLA7080Mpr mosfet v ds(on) vs. case temperature t c (c) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 ?25 0 25 50 75 100 125 v ds(on) (v) sla7082mpr mosfet v ds(on) vs. case temperature t c (c) 1.1 1.0 0.9 0.8 0.7 0.6 ?25 0 25 50 75 100 125 v f (v) SLA7080Mpr mosfet body diode v f vs. case temperature t c (c) 1.1 1.0 0.9 0.8 0.7 0.6 ?25 0 25 50 75 100 125 v f (v) sla7081mpr mosfet body diode v f vs. case temperature t c (c) 1.1 1.0 0.9 0.8 0.7 0.6 ?25 0 25 50 75 100 125 v f (v) sla7082mpr mosfet body diode v f vs. case temperature t c (c) 1.1 1.0 0.9 0.8 0.7 0.6 ?25 0 25 50 75 100 125 v f (v) sla7083mpr mosfet body diode v f vs. case temperature t c (c) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 ?25 0 25 50 75 100 125 v ds(on) (v) sla7081mpr mosfet v ds(on) vs. case temperature t c (c) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 ?25 0 25 50 75 100 125 v ds(on) (v) sla7083mpr mosfet v ds(on) vs. case temperature t c (c) i o = 0.5 a i o = 1 a i o = 1 a i o = 1.5 a i o = 1 a i o = 2 a i o = 2 a i o = 1 a i o = 3 a i o = 0.5 a i o = 1 a i o = 1 a i o = 1.5 a i o = 1 a i o = 2 a i o = 3 a i o = 2 a i o = 1 a allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
unipolar 2-phase stepping motor driver ics SLA7080M series 6 logic block this circuit block is integrated on the control ic (mic). it oper- ates by the logic power supply, v dd , and propagates signals to each circuit block in accordance with the logic input signals. regulator circuit this circuit block is integrated on the control ic (mic). the integrated regulator circuit is used in driving the output mosfet gates and in powering other internal linear circuits. dual phase output control the SLA7080M series allows dual phase operation based on external input to the inx pins. the phase-switching logic is shown in the following table: phase a [b] ina [inb] i n a [ i n b ] outa [outb]* o u t a [ o u t b ]* low low off off high low on off low high off on high high off off *out indicates power mosfet drain state (does not indicate pwm operation) pwm control this circuit block is integrated on the control ic (mic). this is the main circuit block for pulse width modulated (pwm) control of self-excitation and external excitation for motor driving. an illustration of pwm behavior is shown in figure 1. pwm control mode is set by the sync pin. set sync to logic high for synchronous pwm, and set it to logic low for asynchro- nous pwm. pwm off-time, t off , (for self-excitation), minimum off-time (for external excitation), and pwm minimum on-time (blanking time), t on(min) , are clocked by means of the built-in oscillator. the length of t off is fixed internally. like in the sla7070m series, the SLA7080M series has a power-saving function that reduces power consumption during t off . this function recirculates electromotive force that is stored in the motor coil while the power mosfets are turned on. the time interval during which the output mosfets are on is t on . the minimum duration for the pwm minimum on-time, t on(min) , is effectively the blanking time selected, even if the application attempts to shorten t on in order to limit current. the minimum coil current is at t on(min) , so when the coil current is limited at power- down or other events, it can be no shorter than the blanking time. blanking time the blanking time function is provided to limit current in order to suppress ringing immediately after pwm turns on, and to improve current control tracking. blanking time in effect deter- mines pwm minimum on-time, t on(min) . the length of the blank- ing time is selected by the b_sel pin. set b_sel to logic high for 3.2 s blanking time, and set it to logic low for 5.2 s. some ringing is generated for a few microseconds after pwm switching (see figure 2). ringing can result from various causes, such as capacitance between motor cells, or inappropriate motor wiring. to suppress this behavior, the blanking time selection sets a minimum time interval during which current detection signals from the current sense comparators are ignored after a pwm switch-on. current control (tracking) in the SLA7080M series is regulated by comparing the detection voltage on the sense resistor, v rs , with the reference voltage, v ref . if the ringing noise causes v rs to exceed v trip , the comparator is activated and pwm turns off. current control performance at shorter pwm waveforms can be improved by shortening the blanking time, but this decreases the effectiveness of ringing suppression, resulting in the seek- ing behavior shown in figure 3.) to solve this problem, the SLA7080M series is designed to allow dynamic selection of blanking time duration. in the event that the seeking behavior functional description figure 1. pwm waveform on SLA7080M sense resistor, r s ; t off is fixed and the blanking time, t off(min) , is dynamically selectable. 0 v out t on(min) i trip one pwm cycle t on t off phase a [b] a [ b ] a [ b ] allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
unipolar 2-phase stepping motor driver ics SLA7080M series 7 occurs when the short blanking time is selected, the problem may be eased by the selection of the longer blanking time. a comparison of these trade-offs is provided in the following table (comparisons assume that operating conditions other than the SLA7080M, such as motors, motor power supply voltage, ref input voltages and so forth, as well as circuit constants, are identical in each case). parameter better performance internal blanking set time short or long minimize pwm on-time (minimum) short maximize ringing noise suppression long minimize coil current short synchronous control the SLA7080M series has a chopping synchronous function to prevent noise which may occasionally be generated during the motor hold state. this function can be operated by setting the sync pin to logic high, which generates a timing signal to synchronize the chopping of the a and b phases. (this function operates identically to that of the sla7070m.) this function should be used only during self-excitation pwm control. the use of synchronous control during normal stepping motor rotation is not recommended because it produces less motor torque or may cause motor vibration because the control current does not stabilize. protection circuit a built-in protection circuit detects against motor coil opens and shorts. operation of the protection circuit disables all of the out- puts, and sets the flag pin. to leave protection mode and return to normal operation, cycle the logic power supply, v dd . protection is activated by sensing voltage on the internal sensing resistors, r s . overcurrent that flows without passing the sense resistors cannot be detected. therefore, this does not detect an overcurrent condition resulting from the out pins or sense pins shorting to gnd. protection against motor coil opens is available only during pwm operation. therefore, it does not work during constant volt- age driving, when the motor is rotating at high speed. motor coil short circuit protection (load short circuit) this function operates by detecting voltage v rs on the internal sense resistors in the same manner as the current control function. the threshold voltage, v ocp , is set to 0.7 v typical. when v rs i trip 5 s/div i trip 500 ns/div 20 s/div figure 3. pwm waveform exhibiting seeking behavior figure 2. ringing on pwm waveform while driving a motor. the circled area in panel a is expanded in time and shown in panel b. (a) (b) allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
unipolar 2-phase stepping motor driver ics SLA7080M series 8 > v ocp the motor coil short-circuit protection starts its operation. coil short circuit and the protection circuit behavior are illus- trated in figure 4. motor coil open protection (load open circuit) (patent pending.) this function operates by detecting polarity reversal of voltage v rs on the internal sense resistors. after the state is confirmed, the device shuts down the outputs. this allows detection of a wire of the motor coil breaking. coil open circuit and the protection circuit behavior are illustrated in figure 5. in a unipolar topology, an undetected broken wire on an out- put pin (motor coil), can cause destruction of the driver due to overheating. this is because after the wire breaks, the connected driver mosfet repeatedly undergoes avalanche breakdown at pwm turn-off, due to the higher energy applied from back electromagnetic force, as the energy stored in the motor coil is dissipated. avalanche breakdown occurs when the output voltage surpasses the breakdown voltage between the drain and source of the mosfet. although the mosfets in the SLA7080M series have an ample avalanche breakdown rating for rated operating temperatures, the avalanche breakdown rating decreases as the operating temperature rises (as avalanche breakdown is repeated). when the SLA7080M series protection circuit detects avalanche breakdown, it allows the breakdown to repeat 3 times to prevent false detections and then turns off the mosfet outputs before overheating can occur. the detection function operates as follows. when the wire of the motor coil is broken, the regenerating current that can reach the mosfet breakdown level flows during the pwm off-time. although the detection voltage, v rs , has negative potential in normal operation, when a wire breaks in the motor coil, positive potential appears during a pwm off-time. that is to say, wire breakage in the motor coil can be detected, when v rs is detected with positive potential during pwm off-time. in addition to requiring three breakdown cycles to confirm the figure 4 . motor coil short circuit protection operation figure 5. motor coil open circuit protection in unipolar configuration, (a) pwm normal operation, (b) pwm operation with motor partially disconnected or broken wire in coil; v m is the motor control voltage SLA7080M 0 v ref v ocp coil short circuit v g v g stepper motor normal current v rs r s v rs output disable coil short circuit SLA7080M 0 v ref 0 0 v g v out v out v m 2 v m v dss v g stepper motor i off i on v out v rs r s v rs i off i on SLA7080M 0 v ref avalanche breakdown 0 0 v g v g stepper motor disconnection r s v rs open detection (a) (b) allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
unipolar 2-phase stepping motor driver ics SLA7080M series 9 open circuit condition, the SLA7080M protection function also provides a fixed delay, t opp , before the device shuts down the outputs. this is to avoid false detections based on ringing after pwm turn-off. referring to figure 6, if the breakdown confirma- tion interval (3 breakdown cycles) plus ringing effects are shorter than t opp , the protection circuit functions correctly. however, if ringing causes the total period to exceed t opp , false detections can occur. if this is the case, check the motor and wiring layout to reduce ringing. variation among device variants and applications should be taken into consideration. one possible solution is the addition of a capacitor between the outx and gnd pins, which could damp the ringing sufficiently to allow continuation of nor- mal operation when there is no actual avalanche breakdown. synchronous rectification a dead time, approximately 0.5 s, is set to prevent simultane- ous turn-on of the mosfets at switching during synchronous rectification. during the dead time, the regenerating current flows through the body diode on each mosfet chip, as shown in figure 7. power supply there is no restriction on the on/off sequencing of the main power supply, v bb , and the logic supply, v dd . because the SLA7080M series has a structure that separates the control ic (mic) with the power mosfet of the output stage, the motor power supply and the main power supply are electrically separated. therefore, it is possible to drive the device by using different voltages for motor power supply and main power supply. note that the power sup- plies have different voltage ranges. figure 6. alternative t opp scenarios: (a) no ringing, breakdown confirmed after three cycles, (b) ringing plus three cycles is less than t opp with no effect on operations, and (c) ringing is greater than t opp generates false detections of breakdowns t opp t confirm t confirm t confirm t opp t opp v out v dss (a) (b) (c) figure 7. synchronous rectification operation SLA7080M 0 v ref 0 0 v g v g pwm on t dead t dead pwm on pwm off v g v g stepper motor back emf during dead time normal current v rs r s i on i off v rs allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
unipolar 2-phase stepping motor driver ics SLA7080M series 10 application information ina, i n a , inb, i n b , b_sel, and sync pins these inputs operate with cmos input. the default state is high impedance, and they must be driven to logic high or logic low. when these logic input pins are used, they should be pulled down to the ground side using a 1 to 10 k resistor. any of these pins that are not used must either be pulled up to the v dd side or be pulled down to the ground side. if they are left open, malfunction or permanent damage to the product may result. for example, in case the signal from the microcomputer has high impedance, a pull-down or pull-up resis- tor should be provided. in particular, when an inx pin is in high impedance during operation, abnormal oscillation of the output may be caused and in the worst case, this will result in permanent damage to the mosfets. a low pass filter (lpf) is provided on each the logic input pin. these improve noise filtering. sleep mode the SLA7080M can be set into sleep mode, in which the motor is not controlled, so it can move freely. to enable sleep mode, set the ref pin at more than 2 v. in sleep mode, the device stops the main power supply and decreases circuit current. when shifting the device directly from the sleep mode to the normal operating mode (motor rotation), not only the rise time of the device, but also the rise time of motor excitation current should be considered when determining the amount of time lag from the cancellation of sleep mode to the next motor phase input command. as shown in figure 8, a minimum lag of 100 s is recommended. because of the built-in circuit protection features, be cautious about taking too long when switching between the motor cur- rent setting range and the sleep limit range (refer to figure 9). because the v ocp level occurs in the prohibited range, between those two areas, if the switching time is too lengthy, overcurrent protection will start operating when v sense > v ocp . flag pin this is the output for the protection circuit: flag pin output logic low normal operation high protection circuit operation it is designed for cmos output, as shown in the equivalent circuit in figure 10. therefore, if the flag logic pin is not used, it must be left open. internal sense resistors, r s sense resistors which detect motor currents are incorporated in this product series. the values of the internal sense resistors, r s , can be calculated (for the standard SLA7080M variants listed in this document) by applying the power loss formula: p i o 2 r s . figure 9. reference voltage, v ref , ranges v ref (v) 2.00 sleep limit range motor current setting range v dd v ocp detect (typical) 1.5 a, 3.0 a 2.0 a 1.0 a prohibited range 0.70 0.45 0.30 0.04 0.40 figure 8. external circuit for detecting phase control signals 100 s (min) ref phase command allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
unipolar 2-phase stepping motor driver ics SLA7080M series 11 the resistance value of the incorporated resistors varies accord- ing to the rated currents. rated current detected resistance value (a) ( typical) 1 0.305 1.5 0.305 2 0.205 3 0.155 each resistance value shown above includes the inherent resis- tance (approximately 5 m ) in the SLA7080M due to product structure. in particular, be cautious about noise on the vdd line. when the noise on vdd line exceeds 0.5 v, device malfunction may be caused. to avoid this, special attention should be paid to the layout of the ground circuits. the separation of the vdd ground and the vbb ground from the product gnd pin is effective in reducing the noise. clocking switch signals in normal operation, the input signal for switching is received from an external microcomputer into the inx pins. however, in an application where the signal cannot be input, for example, due to the limitation of ports, this function can be performed using the following method. refer to figure 11, which illustrates a topol- ogy for a synchronization signal generation circuit that uses clock signals. when a logic high level signal is input to the circuit, the capacitor in the circuit is charged and the sync signal is set to logic low level in the SLA7080M. when the clock signal is stopped at low level, the capacitor is dis- charged by the resistor and the sync signal is set to logic high, causing the SLA7080M to shift to the synchronous mode. the rc time constant should be determined by the minimum clock frequency used. in the case of a sequence that keeps the clock input signal at logic high, an inverter circuit must be added. setting motor currents for constant running in the SLA7080M series the motor current level, i o , is deter- mined by the internal sense resistors, r s , and the values selected for the external components r1 and r2 (see figure 12). io is calculated by the following formulas: r 1 r 2 + r 2 v dd v ref = , (2) v ref r s i o = . (3) if v ref is set below 0.04 v, the accuracy of i o setting is highly likely to be degraded due to the variation between individual devices and the impedance of the application trace layout. lower limit of motor current control the SLA7080M series uses a self-excitation pwm current con- trol system with the fixed pwm off-time, t off . when the energy stored in the motor coil is dissipated in less than t off , the coil current flows as an intermittent current as shown in figure 13. that is to say, the pwm average current is decreased and the motor torque is lowered. when the current begins to flow in the coil intermittently, this state is considered the lower limit of the current control, i o (min). figure 10. flag pin equivalent circuit figure 11. external circuit for detecting phase control signals flag v dd SLA7080Mpr esd protection SLA7080M phase v cc 74hc14 sync allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
unipolar 2-phase stepping motor driver ics SLA7080M series 12 sla708xmpr vbb outa outa outb outb vdd ina sync inb ref/sleep senseb sensea gnd r1 r2 6 x r3 sleep q1 ca cb v s = 10 to 44 v v dd =3.0 to 5.5 v signal ground micro- controller power ground star ground ina inb b_sel flag open open gnd1 gnd2 figure 12. typical application circuit using sma7080mpr reference value r1 = 10 k r2 = 1 k (variable resistor) r3 = 10 k the lower limit of the control current varies subject to application conditions, such as the motors used, but it can be calculated by the following formula: v m + r ds(on) i o r m i o (min) =+ . ? ? ? ? ? ? ? t t off exp 1 1 a 1 ? ? ? ? ? ? (2) where: ? is r m l m , v m is the motor supply voltage, i o is the set current value, l m is the motor winding reactance, r ds(on) is the mosfet on-resistance, r m is the motor winding resistance, and t off is the pwm off-time. even if the set control current, i o , is set at less than the calculated i o (min), there is no harmful effect on the SLA7080M devices, but the control current will worsen against set current. figure 13. motor current lower limit typical waveforms; circled area indicates interval when 0 a coil current is generated i o a phase a i trip i trip 0 a i o i o 0 a i o a phase a i o a phase a i o a phase a allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
unipolar 2-phase stepping motor driver ics SLA7080M series 13 verification of avalanche energy due to the unipolar topology of the SLA7080M series, a surge voltage (ringing) that exceeds the mosfet breakdown volt- age might be applied to the device. in anticipation of this surge voltage, the SLA7080M series uses mosfets having sufficient avalanche resistance to withstand such surge voltages. therefore, even if a surge voltage occurs, users will be able to use the device without any problem. however, if the motor wiring harness is long or the SLA7080M is used at greater than the rated current or voltage, an avalanche energy beyond our design expectations may be applied to the device. thus, users must test the avalanche energy applied to the device under actual application conditions. the following procedure can be used to check the avalanche energy in an actual application. the following typical values result from testing (refer to figure 15): v ds(av) = 140 v i d = 1 a t = 0.5 s the avalanche energy, e av , is obtained by substituting values into the following formula: v ds(av) 0.5 i d t e av 140 v 0.5 1 a 0.5 10 -6 = 0.035 (mj) = . (2) the e av thus calculated is compared with the graph shown in figure 15 to confirm that the e av is within the safe operating area of the avalanche breakdown voltage of the mosfets. thermal design the SLA7080M series incorporates a thermal protection func- tion that shuts down all outputs when the control ic tempera- ture exceeds t tsd . however, a comprehensive overtemperature protection function is not provided because the control ic chip is separate from the mosfet chips, the power elements which are the primary sources of heat. it would be unable to respond to sudden temperature changes in the mosfets because of delays in diffusion of the heat. therefore, sufficient thermal evaluation should be performed with the actual application, so that the junction temperature, t j , does not exceed the absolute maximum rating (150c). experimentation is required because it is not practical to calcu- late a realistic power dissipation value, which involves variable parameters such as time constants and excitation modes during actual operation of motors, input frequencies and sequences, and so forth. figure 14. test points and waveform for testing avalanche energy of an application figure 15. avalanche breakdown voltages for repeated cycles SLA7080M t v ds(av) i d stepper motor v ds(av) i d r s 0 0 25 50 75 100 125 150 4 8 12 16 20 t c (c) e av (mj) sla7083mpr sla7082mpr SLA7080Mpr sla7081mpr allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
unipolar 2-phase stepping motor driver ics SLA7080M series 14 given this situation, for initial design estimates, power dissipa- tion should be calculated by approximation, using worst-case conditions, at 2-phase excitation: p d = i o 2 ( r ds(on) + r s ) 2 , (6) where: p d is the power dissipation of the SLA7080M, i o is the output current, r ds(on) is the on-resistance of the mosfets, and r s is the sense resistor resistance. based on the power dissipation of the product thus calculated, the junction temperature of the product is estimated by using the temperature rise curves of figure 16. unless the temperature exceeds 150c under the worst condi- tions (the maximum values of ambient operating temperature), there will be no problem, but final judgment should be made by measuring the device temperature during the actual operation and then verifying power dissipation and junction temperature in accordance with figure 16. when the device is used with a heatsink, the thermal resis- tance, r ja , of the device changes (as do the parameters used in calculating t ja ). this value is calculated from the following formula: r ja r ca + r hs = ( r ja ? r ca ) + r hs , (7) where r hs is the thermal resistance of the heatsink. to estimate the junction temperature rise, t j , from the device temperature measured in the actual operating application, t ca , the following procedure should be followed: 1. the temperature rise of the product, t ca , is measured on pin 12, where it enters the case. 2. from the temperature rise thus obtained, the power dissipation, p d , and the junction temperature, t j , are estimated using figure 16. 3. calculate the relationship between t ca and the junction temperature rise, t j , using the following formula: t j t j c + p d r jc . (8) note that this thermal design information is provided for pre- liminary design estimations only. users should verify the heat generation of the product in the actual operation, by measuring the case temperature, t c , and comparing it to the recommended operating conditions table values. figure 16. power dissipation estimate for junction-to-ambient and case-to- ambient temperature change 0 2 5 5 0 7 5 1 0 0 1 2 5 1 5 0 0 0 . 5 1.0 1 . 5 2.0 2 . 5 3.0 3 . 5 4.0 4 . 5 5.0 change in temperature, ? t (c) allowable power dissipation, p d (w) ? t ja = 26.6 p d ? t ca = 21.3 p d allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
unipolar 2-phase stepping motor driver ics SLA7080M series 15 1357911131517192123 2 4 6 8 10 12 14 16 18 20 22 pad side pin-out diagram terminal list table number name function 1 outa output (phase a) 2 3 o u t a 4 5 sensea current sense (phase a) 6 b_sel blanking time switching input 7 ina switching input (phase a) 8 i n a 9 inb switching input (phase b) 10 i n b 11 vbb main power supply (motor supply) 12 gnd device ground terminal 13 ref/sleep control current/sleep enable input 14 vdd logic supply 15 gnd1 ground 1 terminal 16 gnd2 ground 2 terminal 17 sync pwm synchronous/non-synchronous switching 18 flag output of protection circuit monitor 19 senseb current sense (phase b) 20 o u t b output (phase b) 21 22 outb 23 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
unipolar 2-phase stepping motor driver ics SLA7080M series 16 terminal core material: cu terminal plating: ni, with pb-free solder coating recommended attachment: solder dip (sn-ag-cu) dimensions in millimeters branding codes (exact appearance at manufacturer discretion): 1st line, type: sla708xmr 2nd line, protection: p 3rd line, lot: ymdd where: y is the last digit of the year of manufacture m is the month ( 1 to 9, o, n, d ) dd is the date branding area exposed heatsink pad 1.27 0.5 0.6 0.65 +0.2 ? 0.1 9.3 +0.1 ? 0.5 0.55 +0.2 ? 0.1 16.4 0.2 24.4 0.2 ?3.2 0.15 31 0.2 gate protrusion gate protrusion 9.9 0.2 12.9 0.2 16 0.2 a a b measured at pin tips to case top 1 3 5 7 9 11 13 15 17 19 21 23 246810121416182022 1.7 0.1 4.8 0.2 r1 ref 4.3 ref 4.5 0.7 5 0.5 2.45 0.2 bsc view a deflection at pin bend 0.7 max b ?3.2 0.15 31.3 0.2 view a package outline drawing dual rows, 23 alternating pins; vertical case mounting; pin #1 opposite pad side leadframe plating pb-free. device composition complies with the rohs directive. allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
unipolar 2-phase stepping motor driver ics SLA7080M series 17 580 13.8 31.2 x 137 186 621 z y maximum 12 tubes in y direction maximum 3 tubes in z direction maximum pieces per carton: 18 pieces per tube 12 tubes per layer x 3 layers of tubes 648 pieces per carton tube material: pvc maximum 18 pieces per tube (pins aligned along x direction) rubber plug each end packing specification dimensions in millimeters allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
unipolar 2-phase stepping motor driver ics SLA7080M series 18 warning ? these devices are designed to be operated at lethal voltages and energy levels. circuit designs that embody these components must conform with applicable safety requirements. pre cau tions must be taken to prevent accidental contact with power-line potentials. do not connect ground ed test equipment. the use of an isolation transformer is recommended during circuit development and breadboarding. because reliability can be affected adversely by improper storage environments and handling methods, please observe the following cautions. cautions for storage ? ensure that storage conditions comply with the standard temperature (5c to 35c) and the standard relative humidity (around 40 to 75%); avoid storage locations that experience extreme changes in temperature or humidity. ? avoid locations where dust or harmful gases are present and avoid direct sunlight. ? reinspect for rust on leads and solderability of products that have been stored for a long time. cautions for testing and handling when tests are carried out during inspection testing and other standard test periods, protect the products from power surges from the testing device, shorts between adjacent products, and shorts to the heatsink. remarks about using silicone grease with a heatsink ? when silicone grease is used in mounting this product to a heatsink, it shall be applied evenly and thinly. if more silicone grease than required is applied, it may produce stress. ? volatile-type silicone greases may permeate the product and produce cracks after long periods of time, resulting in reduced heat radiation effect, and possibly shortening the lifetime of the product. ? our recommended silicone greases for heat radiation purposes, which will not cause any adverse effect on the product life, are indicated below: type suppliers g746 shin-etsu chemical co., ltd. yg6260 momentive performance materials, inc. sc102 dow corning toray silicone co., ltd. heatsink mounting method torque when tightening mounting screws. the recommended tightening torque for this product package type is: 58.8 to 78.4 n?cm (6.0 to 8.0 kgf?cm). soldering ? when soldering the products, please be sure to minimize the working time, within the following limits: 2605c 10 s 3805c 5 s ? soldering iron should be at a distance of at least 1.5 mm from the body of the products electrostatic discharge ? when handling the products, operator must be grounded. grounded wrist straps worn should have at least 1 m of resistance to ground to prevent shock hazard. ? workbenches where the products are handled should be grounded and be provided with conductive table and floor mats. ? when using measuring equipment such as a curve tracer, the equipment should be grounded. ? when soldering the products, the head of soldering irons or the solder bath must be grounded in other to prevent leak voltages generated by them from being applied to the products. ? the products should always be stored and transported in our shipping containers or conductive containers, or be wrapped in aluminum foil. allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
unipolar 2-phase stepping motor driver ics SLA7080M series 19 the products described herein are manufactured in ja pan by sanken electric co., ltd. for sale by allegro microsystems, inc. sanken and allegro reserve the right to make, from time to time, such de par tures from the detail spec i fi ca tions as may be re quired to per mit im- prove ments in the per for mance, reliability, or manufacturability of its prod ucts. therefore, the user is cau tioned to ve rify that the in for ma tion in this publication is current before placing any order. when using the products described herein, the ap pli ca bil i ty and suit abil i ty of such products for the intended purpose s hall be reviewed at the users responsibility. although sanken undertakes to enhance the quality and reliability of its prod ucts, the occurrence of failure and defect of sem i con duc tor products at a certain rate is in ev i ta ble. users of sanken products are requested to take, at their own risk, preventative measures including safety design of the equipme nt or systems against any possible injury, death, fires or damages to society due to device failure or malfunction. sanken products listed in this publication are designed and intended for use as components in general-purpose electronic equip ment or apparatus (home ap pli anc es, office equipment, tele com mu ni ca tion equipment, measuring equipment, etc.). their use in any applicat ion requiring radiation hardness assurance (e.g., aero space equipment) is not supported. when considering the use of sanken products in ap pli ca tions where higher reliability is re quired (transportation equipment and its control systems or equip ment, fire- or burglar-alarm systems, various safety devices, etc.), contact a company sales representative to discuss and obtain written con- firmation of your spec i fi ca tions. the use of sanken products without the written consent of sanken in applications where ex treme ly high reliability is required (aerospace equip- ment, nuclear power-control stations, life-support systems, etc.) is strictly prohibited. the information in clud ed herein is believed to be accurate and reliable. ap pli ca tion and operation examples described in this pub li ca tion are given for reference only and sanken and allegro assume no re spon si bil i ty for any in fringe ment of in dus tri al property rights , intellectual property rights, or any other rights of sanken or allegro or any third party that may result from its use. anti radioactive ray design is not considered for the products listed herein. copyright ? 2009 allegro microsystems, inc. this datasheet is based on sanken t-08035 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
unipolar 2-phase stepping motor driver ics SLA7080M series 20 asia-pacific china sanken electric hong kong co., ltd. suite 1026, ocean centre canton road, tsimshatsui kowloon, hong kong tel: 852-2735-5262, fax: 852-2735-5494 sanken electric (shanghai) co., ltd. room 3202, maxdo centre xingyi road 8, changning district shanghai, china tel: 86-21-5208-1177, fax: 86-21-5208-1757 taiwan sanken electric co., ltd. room 1801, 18th floor 88 jung shiau east road, sec. 2 taipei 100, taiwan r.o.c. tel: 886-2-2356-8161, fax: 886-2-2356-8261 japan sanken electric co., ltd. overseas sales headquarters metropolitan plaza building 1-11-1 nishi-ikebukuro, toshima-ku tokyo 171-0021, japan tel: 81-3-3986-6164, fax: 81-3-3986-8637 korea sanken electric korea co., ltd. samsung life yeouido building 16f 23-10, yeouido-dong, yeongdeungpo-gu seoul 150-734, korea tel: 82-2-714-3700, fax: 82-2-3272-2145 singapore sanken electric singapore pte. ltd. 150 beach road, #14-03 the gateway west singapore 189720 tel: 65-6291-4755, fax: 65-6297-1744 europe sanken power systems (uk) limited pencoed technology park pencoed, bridgend cf35 5hy, united kingdom tel: 44-1656-869-100, fax: 44-1656-869-162 north america united states allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01606, u.s.a. tel: 1-508-853-5000, fax: 1-508-853-7895 allegro microsystems, inc. 14 hughes street, suite b105 irvine, california 92618, u.s.a. tel: 1-949-460-2003, fax: 1-949-460-7837 worldwide contacts allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com

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