sanyo electric co.,ltd. semiconductor company tokyo office tokyo bldg., 1-10, 1 chome, ueno, taito-ku, tokyo, 110-8534 japan ordering number : enn7465 61504tn (ot) no. 7465-1/8 overview the STK672-220 is two-phase stepping motor driver hybrid ic (h-ic) that features further miniaturization and improved input logic flexibility as compared to the stk6713 series products. applications the stk672-210 is optimal for use as a stepping motor driver in printers, copiers, xy plotters, and similar equipment. features ? built-in common-mode input protection circuit ? the input signal logic lines are provided as active-high and active-low pairs, and thus support switching the motor wiring. ? built-in current detection resistor for reduced external component mounting area on the printed circuit board. ? inhibit pin (cuts off the motor current) ? wide motor operating range (10 to 45 v) sanyo semiconductors data sheet STK672-220 unipolar constant-current chopper two-phase stepping motor driver output current: 2.8 a any and all sanyo products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft's control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. consult with your sanyo representative nearest you before using any sanyo products described or contained herein in such applications. sanyo assumes no responsibility 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 products described or contained herein. specifications absolute maximum ratings at tc = 25c parameter symbol conditions ratings unit maximum supply voltage 1 v cc 1 max no signal 52 v maximum supply voltage 2 v dd 2 max no signal C0.3 to +7.0 v input voltage v in max logic input pins C0.3 to +7.0 v phase output current i oh max 0.5 s, 1 pulse, when v cc 1 is applied 3.3 a repeated avalanche capacity ear max 30 mj allowable power dissipation pd max with an arbitrarily large heat sink. per mosfet 9 w operating substrate temperature tc max 105 c junction temperature tj max 150 c storage temperature tstg C40 to +125 c
no.7465- 2 /8 STK672-220 1 12 46.6 41.2 12.7 25.5 (9.6) 3.6 0.5 2.0 8.5 4.0 0.4 2.9 1.0 package dimensions unit : mm 4167 sanyo : sip-12 allowable operating ranges at ta = 25 c parameter symbol conditions ratings unit supply voltage 1 v cc 1 with signals applied 10 to 45 v supply voltage 2 v cc 2 with signals applied 5.0 5% v input voltage v ih 0 to v cc 2 v phase driver withstand voltage v dss i d = 1 ma (tc = 25 c) 100 v phase current 1 i oh max 1 clk 3 200 hz, tc = 105 c 2.8 a phase current 2 i oh max 2 clk 3 200 hz, tc = 80 c 3 a electrical characteristics at tc = 25 c, v cc 1 = 24 v, v cc 2 = 5 v note: a fixed-voltage power supply must be used. parameter symbol conditions ratings unit min typ max control supply current i cco with all inputs at the v cc 2 level 3.3 10 ma output current (average) i o ave with r/l = 3.5 /3.8 mh in each phase 0.549 0.610 0.671 a fet diode forward voltage vdf if = 1.0 a 1.1 1.8 v output saturation voltage vsat r l = 12 0.7 1.2 v vref input voltage vrh pin 12 0 3.5 v vref input bias current i ib with pin 12 at 1 v 50 500 na [control input pins] input voltage v ih h-ic pins 6 to 9, and 11 3.5 v v il h-ic pins 6 to 9, and 11 0.7 v input current i ih h-ic pins 6 to 9, and 11, v in = v cc 2 310 a i il h-ic pins 6 to 9, and 11, v in = 0 v 2.5 a
no.7465- 3 /8 STK672-220 internal circuit v cc 2 10 sub off time setting off time setting 4 5 ab 8 a 9 3 2 inhibit 11 pg 1 vref 12 bb 6 b 7 sample application circuit STK672-220 v cc 2 = 5 v 9 8 7 6 12 1 10 stepping motor co2 = 10 f + + ro1 ro2 s.gnd bb b ab a v cc 1 = 24 v mon. co1 = 220 f p.gnd 2 3 4 5 itf02299 11 inhibit ? the co1 ground lead must be connected as close as possible to pin 1 on the hybrid ic. ? hc type cmos levels are recommended as the input specifications for pins 6 to 9. ? pull-up resistors must be used for ttl level inputs. (recommended value: 2 k ) ? excitation control input specifications corresponding output pin corresponding excitation control input signal active: high activ: low 2 ?b ?bb 3 ?bb ?b 4 ?a ?ab 5 ?ab ?a
no.7465- 4 /8 STK672-220 2-phase excitation 1-2 phase excitation phase signal: active high input 2-phase excitation phase signal: active low input 1-2 phase excitation pin 5 mosfet gate signal pin 4 mosfet gate signal pin 3 mosfet gate signal pin 2 mosfet gate signal pin 6 phase signal bb pin 7 phase signal b pin 8 phase signal ab pin 9 phase signal a clock pin 5 mosfet gate signal pin 4 mosfet gate signal pin 3 mosfet gate signal pin 2 mosfet gate signal pin 6 phase signal bb pin 7 phase signal b pin 8 phase signal ab pin 9 phase signal a clock pin 5 mosfet gate signal pin 4 mosfet gate signal pin 3 mosfet gate signal pin 2 mosfet gate signal pin 6 phase signal bb pin 7 phase signal b pin 8 phase signal ab pin 9 phase signal a clock pin 5 mosfet gate signal pin 4 mosfet gate signal pin 3 mosfet gate signal pin 2 mosfet gate signal pin 6 phase signal bb pin 7 phase signal b pin 8 phase signal ab pin 9 phase signal a clock
no.7465- 5 /8 STK672-220 setting the motor current peak value (i oh ) i oh vref rs vref: stk672-210 pin 12 input voltage rs: stk672-210 internal current detection resistor (0.17 2%) model of the motor phase current flowing into the driver ic (pins 2, 3, 4, and 5) vref = (ro2 (ro1 + ro2)) v cc 2 v cc 2 = 5 v current switching techniques due to the input bias current (i ib ) specifications, ro1 must be under 100 k . the figures below present sample circuits that temporarily switch the motor current when, for example a held motor stops. we recommend using the circuit structure in the figure at the left to minimize as much as possible the effects of the saturation voltage of the reference voltage switching transistor. i oh 0 switching circuit 1 switching circuit 2 5 v ro1 ro3 ro2 vref ro1 ro3 ro2 vref 5 v input pin circuits input pin circuit type pin 6, 7, 8, and 9 pin 11 pin 12 when switch 1 is in the ground position, the input resistor will be a 20 k pull-down resistor. mosfet gate signal 10 k 5 v 10 k 5 v to xb phase xb phase pwm signal x phase (xb phase) inhibit 10 k 10 k gnd vref to one of the comparator cr input gnd v cc 2
no.7465- 6 /8 STK672-220 thermal design the size of the heat sink required for the STK672-220 depends on the motor output current i oh (a), the electrical characteristics of the motor, the excitation mode, and the basic drive frequency. the thermal resistance ( q c-a) of the required heat sink can be determined from the following formula. tc max C ta q c C a = ( c/w) pd tcmax: the STK672-220 substrate temperature ( c) ta: the STK672-220 ambient temperature ( c) pd: the average internal power dissipation in the STK672-220 (w) for example, the required area for a heat sink made from 2 mm thick aluminum can be determined from the graph at the right below. note that the ambient temperature is greatly influenced by the ventilation and air flow patterns within the application. this means that the size of the heat sink must be determined with care so that the STK672-220 back surface (aluminum substrate) temperature tc in the mounted state never exceeds, under any conditions that might occur, the temperature tc = 105 c. STK672-220 average internal power dissipation pd of the devices that contribute to the STK672-220 average internal power supply, the devices with the largest power dissipation are the current control devices, the diodes that handle the regenerative current, the current detection resistor, and the predriver circuit. the following presents formulas for calculating the power dissipation for the different excitation (drive) modes. 2 phase excitation mode pd 2ex = (vsat + vdf) 0.5 clock i oh t2 + 0.5 clock i oh (vsat t1 + vdf t3) 1-2 phase excitation mode pd 1-2ex = (vsat + vdf) 0.25 clock i oh t2 + 0.25 clock i oh (vsat t1 + vdf t3) motor hold mode pd holdex = (vsat + vdf) i oh vsat: ron voltage drop + shunt resistor combined voltage vdf: fet internal diode vdf + shunt resistor combined voltage clock: input clock clk (the reference frequency prior to splitting into 4 phases) itf01880 0 4 8 12 16 20 2 6 10 14 18 heat sink thermal resistance, q c-a c/w ic internal average power dissipation, pd w q c-a pd 0 8 12 16 20 4 itf01881 10 2 3 5 7 100 1000 2 3 5 7 heat sink thermal resistance, q c-a c/w heat sink area, s cm 2 q c-a s 1.0 5 7 2 3 10 100 5 7 2 3 no fin 23.0[ c / w] tc max=105 c 40 c 50 c 60 c no fin 23.0[ c / w] mounted vertically convection cooling q c-a= ( c / w) tc max- -t a pd guaranteed ambient temperature 2 mm thick al plate (with no surface finish) (with a flat black surface finish) itf02290 i oh 0a t3 t2 t1 figure 1 motor output current waveform model (commutation current)
no.7465- 7 /8 STK672-220 t1: the time until the winding current reaches its rated current (i oh ) t2: the time in the constant-current control (pwm) region t3: the time from the point a phase signal is cut until the back emf current is dissipated. t1 = (Cl/(r + 0.4) ln (1 C ((r + 0.4)/v cc 1) i oh ) t3 = (Cl/r) ln ((v cc 1 + 0.4)/(i oh r + v cc 1 + 0.4) v cc 1: motor supply voltage (v) l: motor inductance (h) r: motor winding resistance ( ) i oh : set motor output current wave height (a) the constant-current control time t2, and the time t (= t1 + t2 + t3) that the phase signal is on in each excitation mode are as follows. 2 phase excitation mode: t2 = (2/clock) C (t1 + t3) 1-2 phase excitation mode: t2 = (3/clock) C t1 determine the values for vsat and vdf by substitution using the graphs for vsat vs i oh and vdf vs i oh for the set current value for i oh . then judge whether or not a heat sink is required from the determined average power dissipation for the STK672-220 by comparison with the ? tc vs. pd graph. note that it is necessary to check the temperature rise in the actual application system case, since the STK672-220 substrate temperature tc changes with the air convection conditions around the STK672-220 when a heat sink without fins is used. itf02300 0 1 2 4 3 output saturation v oltage, vsat v motor current, i o a vsat i o 0 1.0 1.5 2.0 2.5 0.5 itf02301 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 f orw ard v oltage, vdf v motor current, if a vdf if 0.4 0 0.2 0.8 0.6 1.6 1.4 1.2 1.0 tc = 105 c 25 c 105 c tc = 25 c itf02303 0 20 40 60 80 100 120 input pin current, i ih , i il a substrate temperature, tc c i ih tc 1000 7 5 3 2 100 7 5 3 2 10 0.1 7 5 3 2 1.0 7 5 3 2 itf02302 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 reference v oltage, vref v motor current, i oh a vref i oh 0.6 0.5 0 0.1 0.4 0.3 0.2 i ih i il
ps no.7465- 8 /8 STK672-220 specifications of any and all sanyo products described or contained herein stipu late the performance , characteristics, and functions of the described products in the independent stat e, 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 p roducts or equipment. sanyo electric co., ltd. strives to supply high-quality high-reliability product s. however, any and al l semiconductor products fail with some probability. it is possible that these pro babilistic failures coul d give rise to accidents or events that could endanger human lives, that could giv e rise to smoke or fire, or that could cause damage to other property. when designing equipment, adopt sa fety measures s o t hat these kinds of accidents or events cannot occur. such measures include but a re not limited to protectiv e circuits and error prevention circuits for safe design, redundant design, and st ructural design. in the event that any or all sanyo products(including technical data,services) d escribed o r contained herein are controlled under any of applicable local export control law s and regulations, such products m ust not be e xpor ted without obtaining the e xpor t license from the author ities concerned in accordance with the above law. no part of this publication may be reproduced or transmitted in any form or by a ny means, electronic o r mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written permission of sanyo electric co. , ltd. any and all information described or contained herein are subject to change with out notice due to product/technology improvement, etc. when designing equipment, refer to the "del ivery specification " for the sanyo product that you intend to use. information (including circuit diagrams and circuit parameters) herein is for ex ample only ; it is not guaranteed for volume production. sanyo believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of inte llectual property rights or other rights of third parties. this catalog provides information as of june, 2004. specifications and information herein are subject to change without notice. itf02304 0 20 40 60 80 100 120 motor current, i oh a substrate temperature, tc c i oh - - tc 0.5 1.0 1.5 2.0 2.5 0 itf02307 0 20 10 40 60 80 100 30 50 70 90 110 motor current, i oh a substrate temperature, tc c i oh tc 1.5 2.0 2.5 3.0 3.5 1.0 itf02306 100 2 3 5 7 1000 2 3 5 7 10000 input frequenc y , clk hz 10 20 30 40 50 60 70 80 0 itf02305 0 0.5 1.0 1.5 2.0 2.5 3.5 substrate temperature rise, ? tc c hybrid ic internal po wer dissipation, pd w ? tc - - pd substrate temperature rise, ? tc c ? tc clk 10 20 30 40 50 60 70 80 90 0 3.0 i oh = 1.5 a 2e x motor v oltage: 24 v v ertical, independent, heat sink without f ins natural con v ection motor: r = 1.4 mh, l = 1.6 mh i oh = 1.8 a 1-2e x motor running motor hold state current
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