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pg-dso-24-13 data sheet 1 rev. 1.1, 2008-06-16 2-phase stepper-mo tor driver tle4726g bipolar ic overview features ? 2 0.75 a / 50 v outputs ? integrated driver, control logic and current control (chopper) ? fast free-wheeling diodes ? low standby-current drain ? full, half, quarter, mini step description tle4726g is a bipolar, monolithic ic for dr iving bipolar stepper motors, dc motors and other inductive loads that operate on constant current. the control 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 opera ting voltages up to 50 v. the direction and value of current are pr ogrammed for each phas e via separate control inputs. a common oscillator generates the timi ng for the current co ntrol and turn-on with phase offset of the two output stages. the two output stages in a full-bridge configuration have integrated, fast free-w heeling diodes and are free of crossover current. the logic is supplied either separately with 5 v or taken from the mo tor supply voltage by way of a series resistor and an integrated z-diode. t he device can be driv en directly by a microprocessor with the possibilit y of all modes from full st ep through half step to mini step. type ordering code package tle4726g on request pg-dso-24-13
tle4726g data sheet 2 rev. 1.1, 2008-06-16 figure 1 pin configuration (top view) 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
data sheet 3 rev. 1.1, 2008-06-16 tle4726g pin definitions and functions pin no. function 1, 2, 23, 24 digital control inputs i x0, i x1 for the magnitude of the current of the particular phase. 3 input phase 1 ; controls the current through phase winding 1. on h-potential the phase current flows from q11 to q12, on l-potential in the reverse direction. 5, 6, 7, 8, 17, 18, 19, 20 ground ; all pins are connected internally. 4 oscillator ; works at approx. 25 khz if this pin is wired to ground across 2.2 nf. 10 resistor r 1 for sensing the current in phase 1. 9, 12 push-pull outputs q11, q12 for phase 1 with integrated free-wheeling diodes. 11 supply voltage ; block to ground, as close as possible to the ic, with a stable electrolytic capacitor of at least 10 f in parallel with a ceramic capacitor of 220 nf. 14 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 integrated. in both cases block to ground directly on the ic with a stable electrolytic capacitor of 10 f in parallel with a ceramic capacitor of 100 nf. 13, 16 push-pull outputs q22, q21 for phase 2 with integrated free-wheeling diodes. 15 resistor r 2 for sensing the current in phase 2. 21 inhibit input ; the ic can be put on standby by low potential on this pin. this reduces the current consumption substantially. 22 input phase 2 ; controls the current flow through phase winding 2. on h-potential the phase current flows from q21 to q22, on l potential in the reverse direction. i x1 i x0 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 typical i max with r sense = 1 : 750 ma
tle4726g data sheet 4 rev. 1.1, 2008-06-16 figure 2 block diagram 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 5 rev. 1.1, 2008-06-16 tle4726g note: stresses above those listed here may cause permanent damage to the device. exposure to absolute maximum rating conditions for extended periods may affect device reliability. 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 0 6.5 v z-diode z-current of v l i l ?0ma output current i q ?1 1 a ground current i gnd ?2 2 a logic inputs v ixx ?6 v l + 0.3 v i xx ; 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 t j 125 150 c c max. 10,000 h storage temperature t stg ?50 125 c
tle4726g data sheet 6 rev. 1.1, 2008-06-16 note: in the operating range, the functions given in the circuit description are fulfilled. 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 ?25 110 c measured on pin 5 p diss = 2 w output current i q ?800 800 ma logic inputs v ixx ?5 v l v i xx ; phase 1, 2; inhibit thermal resistances junction ambient junction ambient (soldered on a 35 m thick 20 cm 2 pc boar copper area) junction case r th ja r th ja r th jc 75 50 15 k/w k/w k/w pg-dso-24-13 p g-dso-24-13 measured on pin 5 p g-dso-24-13 characteristics v s = 40 v; v l = 5 v; ?25 c t j 125 c parameter symbol limit values unit test condition min. typ. max. current consumption from + v s from + v s from + v l from + v l i s i s i l i l 0.2 16 1.7 18 0.5 20 3 25 ma ma ma ma v inh = l v inh = h i q1/2 = 0, i xx = l v inh = l v inh = h i q1/2 = 0, i xx = l
data sheet 7 rev. 1.1, 2008-06-16 tle4726g oscillator output charging current charging threshold discharging threshold frequency i osc v oscl v osch f osc 18 110 1.3 2.3 25 40 a v v khz c osc = 2.2 nf phase current selection current limit threshold no current hold setpoint accelerate v sense n v sense h v sense s v sense a 200 420 700 0 250 540 825 300 680 950 mv mv mv mv i x0 = h; i x1 = h i x0 = l; i x1 = h i x0 = h; i x1 = l i x0 = l; i x1 = l logic inputs ( i x1 ; i x0 ; phase x) threshold l-input current l-input current h-input current v i i il i il i ih 1.4 (h l) ?10 ?100 2.3 (l h) 10 v a a a v i = 1.4 v v i = 0 v v i = 5 v standby cutout (inhibit) threshold threshold hysteresis v inh (l h) v inh (h l) v inhhy 2 1.7 0.3 3 2.3 0.7 4 2.9 1.1 v v v internal z-diode z-voltage v lz 6.5 7.4 8.2 v i l = 50 ma characteristics (cont?) v s = 40 v; v l = 5 v; ?25 c t j 125 c parameter symbol limit values unit test condition min. typ. max.
tle4726g data sheet 8 rev. 1.1, 2008-06-16 note: the listed characteristics are ensured over the operating range of the integrated circuit. typical characteristics specify mean values expected over the production spread. if not otherwise specified, typical characteristics apply at t a =25 c and the given supply voltage. power outputs diode transistor sink pair (d13, t13; d14, t14; d23, t23; d24, t24) saturation voltage saturation voltage reverse current forward voltage forward voltage v satl v satl i rl v fl v fl 0.3 0.5 0.9 1 0.6 1 300 1.3 1.4 v v a v v i q = ?0.5 a i q = ?0.75 a v q = 40 v i q = 0.5 a i q = 0.75 a diode transistor source pair (d11, t11; d12, t12; d21, t21; d22, t22) saturation voltage saturation voltage saturation voltage saturation voltage reverse current forward voltage forward voltage diode leakage current v satuc v satud v satuc v satud i ru v fu v fu i sl 0.9 0.3 1.1 0.5 1 1.1 1 1.2 0.7 1.4 1 300 1.3 1.4 2 v v v v a v v ma i q = 0.5 a; charge i q = 0.5 a; discharge i q = 0.75 a; charge i q = 0.75 a; discharge v q = 0 v i q = ?0.5 a i q = ?0.75 a i f = ?0.75 a characteristics (cont?) v s = 40 v; v l = 5 v; ?25 c t j 125 c parameter symbol limit values unit test condition min. typ. max.
data sheet 9 rev. 1.1, 2008-06-16 tle4726g 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
tle4726g data sheet 10 rev. 1.1, 2008-06-16 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 11 rev. 1.1, 2008-06-16 tle4726g input characteristics of i xx , phase x, inhibit oscillator frequency f osc versus junction temperature t j input current of inhibit 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
tle4726g data sheet 12 rev. 1.1, 2008-06-16 figure 3 test circuit figure 4 application circuit aes02301 1 2 3 21 24 23 22 14 11 9 12 16 13 415 10 gnd osc 5, 6, 7, 8 17, 18, 19, 20 r 1 1 r 2 1 2.2 nf phase 1 phase 2 inhibit v l v s q11 q12 q21 q22 tle4726g 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 aes02302 1 2 3 21 24 23 22 14 11 9 12 16 13 41510 gnd osc 5, 6, 7, 8 17, 18, 19, 20 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 tle4726g m 220 nf 100 f +40 v +5 v 220 nf 100 f 10
data sheet 13 rev. 1.1, 2008-06-16 tle4726g figure 5 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
tle4726g data sheet 14 rev. 1.1, 2008-06-16 figure 6 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
data sheet 15 rev. 1.1, 2008-06-16 tle4726g figure 7 quarter-step operation
tle4726g data sheet 16 rev. 1.1, 2008-06-16 figure 8 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
data sheet 17 rev. 1.1, 2008-06-16 tle4726g figure 9 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
tle4726g data sheet 18 rev. 1.1, 2008-06-16 figure 10 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
data sheet 19 rev. 1.1, 2008-06-16 tle4726g calculation of power dissipation the total power dissipation p tot is made up of saturation losses p sat (transistor saturation voltage and diode forward voltages), quiescent losses p q (quiescent current times supply voltage) and switching losses p s (turn-on / turn-off operations). the following equations give the power dissipation for chopper operation without phase reversal. this is the worst case, because full current flows for the entire time and switching losses occur in addition. p tot = 2 p sat + p q + 2 p s 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 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 voltage of source transistor (t1, t2) during charge cycle v satud = saturation voltage of source transistor (t1, t2) during discharge cycle v fu = forward voltage of free-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 + ++ ?? ?? ?? ?
tle4726g data sheet 20 rev. 1.1, 2008-06-16 figure 11 figure 12 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
data sheet 21 rev. 1.1, 2008-06-16 tle4726g application hints the tle726g is intended to drive both phases of a stepper motor. special care has been taken to provide high efficiency, robustness and to minimize external components. power supply the tle726g will work with supply voltages ranging from 5 v to 50 v at pin v s . as the circuit operates with chopper regulation of the current, interference generation problems can arise in some applications. therefore the power supply should be decoupled by a 0.22 f ceramic capacitor located near the package. unstabilized supplies may even afford higher capacities. current sensing the current in the windings of the stepper motor is sensed by the 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 voltage 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 resistors should be wired to gnd as directly as possible. capacitive loads such as long cables (with high wire to wire capacity) to the motor should be avoided for the same reason. synchronizing several choppers in some applications synchrone chopping of several stepper motor drivers may be desireable to reduce acoustic interference. this can be done by forcing the oscillator of the tle726g by a pulse generator overdriving the oscillator loading currents (approximately 100 a). in these applications 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 tle4726g uses a special break before make timing of the power transistors. this timing circuit can be triggered by short glitches (some hundred nanoseconds) at the phase inputs causing the output stage to become high resistive during some microseconds. this will lead to a fast current decay during that time. to achieve maximum current accuracy such glitches at the phase inputs should be avoided by proper control signals.
tle4726g data sheet 22 rev. 1.1, 2008-06-16 thermal shut down to protect the circuit against thermal destruction, thermal shut down has been implemented. to provide a warning in critical applications, the current of the sensing element is wired to input inhibit. before thermal shut down occurs inhibit will start to pull down by some hundred microamperes. this current can be sensed to build a temperature prealarm.
data sheet 23 rev. 1.1, 2008-06-16 tle4726g package outlines 1 package outlines figure 1 pg-dso-24-13 green product (rohs compliant) to meet the world-wide customer requirements for environmentally friendly products and to be compliant with government regulations the device is available as a green product. green products are rohs-compliant (i.e pb-free finish on leads and suitable for pb-free soldering according to ipc/jedec j-std-020). 2) lead width can be 0.61 max. in dambar area 1) 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 +0.0 9 max. 8? p/pg-dso-24-1, -3, -8, - 9 , -13, -15, -16-po v01 for further information on alternativ e packages, please vi sit our website: http://www.infineon.com/packages . dimensions in mm
tle4726g revision history data sheet 24 rev. 1.1, 2008-06-16 2 revision history revision date changes 1.1 2008-06-17 initial vers ion of rohs-compliant derivate of tle4726 page 1: aec certified statement added page 1 and 23: added rohs compliance statement and green product feature page 1 and 23: package changed to rohs compliant version page 24-25: added revision his tory, updated legal disclaimer
edition 2008-01-04 published by infineon technologies ag 81726 munich, germany ? 2008 infineon technologies ag all rights reserved. legal disclaimer the information given in this docu ment shall in no event be regarded as a guarantee of conditions or characteristics. with respect to any examples or hints given herein, any typical values stated herein and/or any information regarding the application of the device, infine on technologies hereby disclaims any and all warranties and liabilities of any kind, including witho ut limitation, warranties of non-infrin gement of intellectua l property rights of any third party. information for further information on technology, delivery terms and conditions and prices, please contact the 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 the nearest infineon technologies office. infineon technologies compon ents may be used in life-su pport devices or systems only 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 safe ty 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 an d/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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