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type ordering code package tca 3727 q67000-a8302 p-dip-20-6 tca 3727 g q67000-a8335 p-dso-24-3 2-phase stepper-motor driver bipolar ic tca 3727 p-dso-24-1, -3 data sheet 1 rev. 2.0, 2004-10-01 features ?2 0.75 amp. / 50 v outputs ? integrated driver, control logic and current control (chopper) ? fast free-wheeling diodes ? max. supply voltage 52 v ? outputs free of crossover current ? offset-phase turn-on of output stages ? z-diode for logic supply ? low standby-current drain ? full, half, quarter, mini step description tca 3727 is a bipolar, monoli thic ic for driving bipolar stepper motors, dc motors an d other inductive loads that operate on constant current. the contro l logic and power output stages for two bipolar windings are integrated on a single chip which permits switched current control of motors with 0.75 a per phase at operating voltages up to 50 v. the direction and value of cu rrent are programmed for each phase via separate control inputs. a common oscillator gen erates the timing for the curre nt control and turn-on with phase offset of the two output stages. the tw o output stages in a fu ll-bridge configuration have integrated, fast free-whe eling diodes and are free of cr ossover current. the logic is supplied either separately with 5 v or taken from the motor supply voltage by way of a series resistor and an integrated z-diode. the device can be dr iven directly by a microprocessor with the possibilit y of all modes from full step through half step to mini step.
tca 3727 data sheet 2 rev. 2.0, 2004-10-01 figure 1 pin configuration tca 3727 (top view) iep00696 21 phase 2 inhibit gnd gnd q21 q11 gnd gnd osc 11 10 11 10 q22 9 12 8 13 7 14 6 15 5 16 4 17 3 18 2 19 1 20 12 r r v s q12 v l phase 1 20
data sheet 3 rev. 2.0, 2004-10-01 tca 3727 figure 2 pin configuration tca 3727 g (top view) table 1 pin definitions and functions pin no. function 1, 2, 19, 20 (1, 2, 23, 24) 1) digital control inputs ix0, ix1 for the magnitude of the current of the particular phase. see table 2 . 3 input phase 1; controls the current th rough phase winding 1. on h-potential the phase curr ent flows from q11 to q1 2, on l-potential in the reverse direction. 5, 6, 15, 16 (5, 6, 7, 8, 17, 18, 19, 20) 1) ground; all pins are connected internally. 4 oscillator; works at approx. 25 khz if this pin is wired to ground across 2.2 nf. 8 (10) 1) resistor r 1 for sensing the cu rrent in phase 1. 7, 10 (9, 12) 1) push-pull output s q11, q12 for phase 1 with integrated free- wheeling diodes. q12 q22 q21 gnd gnd osc phase 1 phase 2 11 r 1 iep00898 10 gnd q11 v s ++ l v 2 r inhibit 20 21 gnd 24 1 23 2 22 3 21 4 20 5 19 6 18 7 17 8 16 9 15 10 14 11 13 12 gnd gnd gnd gnd
tca 3727 data sheet 4 rev. 2.0, 2004-10-01 9 (11) 1) supply voltage; block to ground, as close as possible to the ic, with a stable electrolytic c apacitor of at least 10 f in parallel with a ceramic capacitor of 220 nf. 12 (14) 1) logic supply voltage; either supply with 5 v or connect to + v s across a series resistor. a z-diode of approx. 7 v is in tegrated. in both cases block to ground directly on th e ic with a stable electrolytic capacitor of 10 f in parallel with a cera mic capacitor of 100 nf. 11, 14 (13, 16) 1) push-pull output s q22, q21 for phase 2 with integrated free wheeling diodes. 13 (15) 1) resistor r 2 for sensing the cu rrent in phase 2. 17 (21) 1) inhibit input; the ic can be put on standb y by low potential on this pin. this reduces the current consumption substantially. 18 (22) 1) input phase 2; controls the current flow through phase winding 2. on h-potential the phase current flows fr om q21 to q22, on l potential in the reverse direction. 1) tca 3727 g only table 2 digital control inputs ix0, ix1 typical i max with r sense = 1 ? , 750 ma ix1 ix0 phase current example of motor status h h 0 no current h l 1/3 i max hold l h 2/3 i max set ll i max accelerate table 1 pin definitions and functions (cont?d) pin no. function
data sheet 5 rev. 2.0, 2004-10-01 tca 3727 figure 3 block diagram tca 3727 ieb00697 12 9 7 10 8 q11 q12 r 1 4 1 2 3 osc function logic + v ls v + gnd phase 1 phase 1 phase 1 5, 6, 15, 16 phase 2 phase 2 phase 2 logic function inhibit 18 19 20 17 2 r q22 q21 13 11 14 inhibit 10 11 20 21
tca 3727 data sheet 6 rev. 2.0, 2004-10-01 figure 4 block diagram tca 3727 g ieb00899 d14 d13 d12 d11 t14 t12 t13 t11 14 11 9 12 10 q11 q12 r 1 4 1 2 3 oscillator functional logic + v ls v + 11 gnd phase 1 phase 1 phase 1 5-8, 17-19 phase 2 phase 2 phase 2 logic functional inhibit 22 23 24 21 2 r q22 q21 15 13 16 t21 t23 t22 t24 d21 d22 d23 d24 inhibit 10 20 21
data sheet 7 rev. 2.0, 2004-10-01 tca 3727 attention: stresses above those listed he re may cause perman ent damage to the device. exposure to absolute maximu m rating conditions for extended periods may affect device reliability. table 3 absolute maximum ratings t a = -40 to 125 c parameter symbol limit values unit remarks min. max. supply voltage v s 052v? logic supply voltage v l 06.5vz-diode z-current of v l i l ?50ma? output current i q -1 1 a ? ground current i gnd -2 2 a ? logic inputs v ixx -6 v l + 0.3 v ixx; phase 1, 2; inhibit r 1 , r 2 , oscillator input voltage v rx, v osc -0.3 v l + 0.3 v ? junction temperature t j ? ? 125 150 c c ? max. 10,000 h storage temperature t stg -50 125 c?
tca 3727 data sheet 8 rev. 2.0, 2004-10-01 note: in the operating range, the functions gi ven in the circuit descr iption are fulfilled. table 4 operating range parameter symbol limit values unit remarks min. max. supply voltage v s 550v? logic supply voltage v l 4.5 6.5 v without series resistor case temperature t c -40 110 c measured on pin 5 p diss = 2 w output current i q -1000 1000 ma ? logic inputs v ixx -5 v l v ixx; phase 1, 2; inhibit thermal resistances junction ambient r th ja ? 56 k/w p-dip-20-6 junction ambient (soldered on a 35 m thick 20 cm 2 pc board copper area) r th ja ? 40 k/w p-dip-20-6 junction case r th jc ? 18 k/w measured on pin 5 p-dip-20-6 junction ambient r th ja ?75k/wp-dso-24-3 junction ambient (soldered on a 35 m thick 20 cm 2 pc board copper area) r th ja ?50k/wp-dso-24-3 junction case r th jc ? 15 k/w measured on pin 5 p-dso-24-3
data sheet 9 rev. 2.0, 2004-10-01 tca 3727 table 5 characteristics v s = 40 v; v l = 5 v; -25 c t j 125 c parameter symbol limit valu es unit test condition min. typ. max. current consumption from + v s i s ?0.20.5ma v inh = l from + v s i s ?1620ma v inh = h i q1/2 = 0, ixx = l from + v l i l ?1.73ma v inh = l from + v l i l ?1825ma v inh = h i q1/2 = 0, ixx = l oscillator output charging current i osc ? 110 ? a? charging threshold v oscl ?1.3?v? discharging threshold v osch ?2.3?v? frequency f osc 18 25 35 khz c osc = 2.2 nf phase current selection ( r 1 ; r 2 ) current limit threshold no current v sense n ? 0 ? mv ix0 = h; ix1 = h hold v sense h 200 250 300 mv ix0 = l; ix1 = h setpoint v sense s 460 540 620 mv ix0 = h; ix1 = l accelerate v sense a 740 825 910 mv ix0 = l; ix1 = l logic inputs (ix1; ix0; phase x) threshold v i 1.4 (h l) ?2.3 (l h) v? l-input current i il -10 ? ? a v i = 1.4 v l-input current i il -100 ? ? a v i = 0 v h-input current i ih ??10 a v i = 5 v standby cutout (inhibit) threshold v inh (l h) 234v? threshold v inh (h l) 1.7 2.3 2.9 v ? hysteresis v inhhy 0.3 0.7 1.1 v ?
tca 3727 data sheet 10 rev. 2.0, 2004-10-01 note: the listed characteristic s are ensured over the operat ing range of the integrated circuit. typical characteristics specify me an values expected over the production spread. if not otherwise specified, typical characteristics apply at t a = 25 c and the given supply voltage. internal z-diode z-voltage v lz 6.5 7.4 8.2 v i l = 50 ma power outputs diode transistor sink pair (d13, t 13; d14, t14; d23, t23; d24, t24) saturation voltage v satl ?0.30.6v i q = -0.5 a saturation voltage v satl ?0.51v i q = -0.75 a reverse current i rl ? ? 300 a v q = 40 v forward voltage v fl ?0.91.3v i q = 0.5 a forward voltage v fl ?11.4v i q = 0.75 a diode transistor source pair (d11, t 11; d12, t12; d21, t21; d22, t22) saturation voltage v satuc ?0.91.2v i q = 0.5 a; charge saturation voltage v satud ?0.30.7v i q = 0.5 a; discharge saturation voltage v satuc ?1.11.4v i q = 0.75 a; charge saturation voltage v satud ?0.51v i q = 0.75 a; discharge reverse current i ru ? ? 300 a v q = 0 v forward voltage v fu ?11.3v i q = -0.5 a forward voltage v fu ?1.11.4v i q = -0.75 a diode leakage current i sl ?12ma i f = -0.75 a table 5 characteristics (cont?d) v s = 40 v; v l = 5 v; -25 c t j 125 c parameter symbol limit valu es unit test condition min. typ. max.
data sheet 11 rev. 2.0, 2004-10-01 tca 3727 quiescent current i s , i l versus supply voltage v s output current i qx versus junction temperature t j quiescent current i s , i l versus junction temperature t j operating condition: ? v l = 5 v ? v inh = h ? c osc = 2.2 nf ? r sense = 1 ? ? load: l = 10 mh, r = 2.4 ? ? f phase = 50 hz ? mode: fullstep 0102030v50 0 10 20 30 40 ma xx = h = l xx j t = 25 c s l l ied01655 v s s , l -25 0 25 50 75 100 c 150 j t qx ied01657 0 200 800 400 600 ma -25 0 25 50 75 100 150 c ied01656 xx = h = l xx = 40v l l s j t 0 10 40 20 s , 30 l ma v s
data sheet 12 rev. 2.0, 2004-10-01 tca 3727 output saturation voltages v sat versus output current i q typical power dissipation p tot versus output current i q (non stepping) forward current i f of free-wheeling diodes versus forward voltages v f permissible power dissipation p tot versus case temperature t c 0 0 0.5 0.2 0.4 0.6 1.0 v 1.5 v f f 0.8 a t j 1.0 = 25 c fl vv fu ied01167 p-dso-24 p-dip-20 measured at pin 5. ied01660 0 6 8 w tot p 12 100 -25 0 50 25 75 c 175 t c 10 4 2 125
data sheet 13 rev. 2.0, 2004-10-01 tca 3727 input characteristics of ixx, phase x, inhibit oscillator frequency f osc versus junction temperature t j input current of inhi bit versus junction temperature t j v l = 5v -6 -5 -2 3.9 2 6 ied01661 0.8 0.4 0 0.4 ma ixx 0.8 v v ixx 0.2 0.6 0.6 0.2 15 20 25 30 khz -25 0 25 50 75 100 125 c 150 v s l v osz c = 40v = 5v = 2.2nf osc f j t ied01663
tca 3727 data sheet 14 rev. 2.0, 2004-10-01 figure 5 test circuit ies00706 1 2 3 17 20 19 18 12 9 7 10 14 11 413 8 gnd osc 5, 6 15, 16 r 1 1 ? r 2 ? 1 2.2 nf phase 1 phase 2 inhibit v l v s q11 q12 q21 q22 tca 3727 220 nf 100 f 220 nf 100 f l s gnd osc v osc q fu r ru satl - - v satu v fu v s - v v l h l h 10 11 21 20 v fl - sense v v v sense
data sheet 15 rev. 2.0, 2004-10-01 tca 3727 figure 6 application circuit ies00707 1 2 3 17 20 19 18 12 3 7 10 14 11 4138 gnd osc 5, 6 15, 16 r 1 1 ? r 2 ? 1 2.2 nf micro controller 11 20 21 phase 1 phase 2 inhibit v l v s q11 q12 q21 q22 tca 3727 m 220 nf 100 f +40 v +5 v 220 nf 100 f 10
tca 3727 data sheet 16 rev. 2.0, 2004-10-01 figure 7 full-step operation t ied01666 accelerate mode normal mode acc set l h l h l h phase 1 i q1 i 10 11 set i i acc i set i acc i q2 acc set i 21 20 h h l l l h phase 2 t t t t t t t
data sheet 17 rev. 2.0, 2004-10-01 tca 3727 figure 8 half-step operation t t t t t t ied01667 t accelerate mode normal mode t 21 20 phase 2 l l h h h l q2 - - - i set acc i i set acc i acc i q1 - phase 1 set i set i l acc i h 10 11 h h l l
tca 3727 data sheet 18 rev. 2.0, 2004-10-01 figure 9 quarter-step operation
data sheet 19 rev. 2.0, 2004-10-01 tca 3727 figure 10 mini-step operation h l h l h l i set i hold 10 11 phase 1 q1 t ied01665 acc i set i i hold acc i i acc set i set hold acc hold i i i i q2 l h h l l h 20 21 phase 2 t t t t t t t
tca 3727 data sheet 20 rev. 2.0, 2004-10-01 figure 11 current control osc v 0 gnd v q12 v s + 0 s + v v + s + v s t t v fu sat 1 v satu d v satu c v phase x phase x operating conditions: v r l s = 40 v = 10 mh = 20 ied01177 0 ? 2.4 v 1.4 v 0 t t v q11 v q22 v q21 t t t v l = 5 v inhibit xx v v v phase x = h = l = h
data sheet 21 rev. 2.0, 2004-10-01 tca 3727 figure 12 phase reversal and inhibit inhibit oscillator high imped. oscillator high imped. phase 1 phase changeover high impedance high impedance high impe- dance slow current decay fast current decay ied01178 gnd v osc 2.3 v 1.3 v 0 l l n 0 t v q11 satl v fu v v satu c satu d v fl v s v + phase 1 fast current decay by inhibit slow current decay operating conditions: v s = 40 v v = 5 v phase 1 l phase 1 r 1x = 20 = l; v + s q12 v = 10 mh ? 1x = h t t t t t t
tca 3727 data sheet 22 rev. 2.0, 2004-10-01 calculation of power dissipation the total power dissipation p tot is made up of ? saturation losses p sat (transistor saturati on voltage and dio de forward voltages), ? quiescent losses p q (quiescent current time s supply voltage) and ? switching losses p s (turn-on / turn -off operations). the following equations give the power dissipation for cho pper operation without phase reversal. this is the worst case, because fu ll current flows for the entire time and switching losses occur in addition. p tot = 2 p sat + p q + 2 p s (1) where ? p sat ? i n { v satl d + v fu (1 - d ) + v satuc d + v satud (1 - d )} ? p q = i q v s + i l v l (2) ? i n = nominal current (mean value) ? i q = quiescent current ? i d = reverse current during turn-on delay ? i r = peak reverse current ? t p = conducting time of chopper transistor ? t on = turn-on time ? t off = turn-off time ? t don = turn-on delay ? t doff = turn-off delay ? t = cycle duration ? d = duty cycle t p /t ? v satl = saturation voltage of sink transistor (t3, t4) ? v satuc = saturation voltag e of source transistor (t 1, t2) during charge cycle ? v satud = saturation voltag e of source transistor (t1, t2) during discharge cycle ? v fu = forward voltage of fr ee-wheeling diode (d1, d2) ? v s = supply voltage ? v l = logic supply voltage ? i l = current from logic supply p s v s t ------ i d t don 2 ---------------------- i d i r + t on 4 ------------------------------ i n 2 ---- - t doff t off + ++ ?? ?? ?? ?
data sheet 23 rev. 2.0, 2004-10-01 tca 3727 figure 13 figure 14 dx3 dx4 dx1 dx2 v s + tx3 tx1 tx4 tx2 l v sense sense r ies01179 iet01210 voltage and current at chopper transistor t d t on off t off t p t v satl v sfu v + i d i r n turn-on turn-off + v fu s v t d on
tca 3727 data sheet 24 rev. 2.0, 2004-10-01 application hints the tca 3727 is intended to drive both pha ses of a stepper moto r. special care has been taken to provide high e fficiency, robustness and to minimize external components. power supply the tca 3727 will work with supply volt ages ranging from 5 v to 50 v at pin v s . as the circuit operates with chopper regulation of the current, inte rference generation problems can arise in some applicatio ns. therefore the po wer supply should be decoupled by a 0.22 f ceramic capacitor locate d near the package. unstabil ized supplies may even afford higher capacities. current sensing the current in the windings of the stepper motor is sensed by t he voltage drop across r 1 and r 2 . depending on the selected current internal comparators will turn off the sink transistor as soon as the volt age drop reaches certain thresholds (typical 0 v, 0.25 v, 0.5 v and 0.75 v); ( r 1 , r 2 = 1 ? ). these thresholds are neither affected by variations of v l nor by variations of v s . due to chopper control fast current rises (up to 10 a/ s) will occur at the sensing resistors r 1 and r 2 . to prevent malfunction of the current sensing mechanism r 1 and r 2 should be pure ohmic. the resi stors should be wired to gnd as directly as possible. capacitive loads such as long ca bles (with high wire to wire capacity) to the motor should be avoided for the same reason. synchronizing several choppers in some applications synchro nous chopping of several step per motor drivers may be desirable to reduce acoustic interference. this ca n be done by forcing the oscillator of the tca 3727 by a pulse generator overdr iving the oscillator loading currents (approximately 100 a). in these applicat ions low level should be between 0 v and 1 v while high level should be between 2.6 v and v l . optimizing noise immunity unused inputs should always be wired to proper voltage levels in order to obtain highest possible noise immunity. to prevent crossconduction of the output stages the tca 3727 uses a special break before make timing of the pow er transistors. this timing ci rcuit can be triggered by short glitches (some hundred nanos econds) at the phase inputs causing the output stage to become high resistive during some microseconds. th is will lead to a fast current decay during that time. to achieve maximum current accuracy su ch glitches at the phase inputs should be avoided by pro per control signals.
data sheet 25 rev. 2.0, 2004-10-01 tca 3727 thermal shut down to protect the circuit against thermal des truction, thermal sh ut down has been implemented. to provide a warning in critic al applications, the current of the sensing element is wired to input inhibi t. before thermal shut down occurs inhibit will start to pull down by some hundred microamperes. th is current can be sensed to build a temperature prealarm.
tca 3727 data sheet 26 rev. 2.0, 2004-10-01 package outlines figure 15 p-dip-20-6 (plastic dual in-line package) gpd05587 you can find all of our packages, sorts of packing and others in our infineon internet page ?products?: http://www.infineon.com/products . dimensions in mm
data sheet 27 rev. 2.0, 2004-10-01 tca 3727 figure 16 p-dso-24-3 (plastic dual smal l outline package) lead width can be 0.61 max. in dambar area does not include plastic or metal protrusion of 0.15 max. per side index marking 1.27 +0.15 0.35 15.6 1 24 2) -0.4 1) 12 0.2 13 24x 0.1 2.65 max. 0.2 -0.1 2.45 -0.2 0.4 +0.8 10.3 ?.3 0.35 x 45? -0.2 7.6 1) 0.23 +0.09 max. 8? 1) 2) gps05144 you can find all of our packages, sorts of packing and others in our infineon internet page ?products?: http://www.infineon.com/products . dimensions in mm
template: ap_a5_vr_tmplt.fm / 2 / 2004-09-15 tca 3727 revision history: 2004-10-01 rev. 2.0 previous version: 1.0, 1998-12-16 page subjects (major changes since last revision)
edition 2004-10-01 published by infineon technologies ag, st.-martin-strasse 53, 81669 mnchen, germany ? infineon technologies ag 2004. all rights reserved. attention please! the information herein is given to describe certain comp onents and shall not be considered as a guarantee of characteristics. terms of delivery and rights to technical change reserved. we hereby disclaim any and all warrant ies, including but not limited to warran ties of non-infringement, regarding circuits, descriptions and charts stated herein. information for further information on technology, delivery terms an d conditions and prices please contact your nearest infineon technologies office ( www.infineon.com ). warnings due to technical requirements components may contain dangerous substances. for information on the types in question please contact your nearest infineon technologies office. infineon technologies components may only be used in life-support devices or system s with the express written approval of infineon technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system, or to affect the safety or effectiveness of that de vice or system. life support devices or systems are intended to be implanted in the hu man body, or to support and/or maintain and sustain and/or protect human life. if they fail, it is reasonable to assume that the health of the user or other persons may be endangered.

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