View L8219LP_8303490.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

1/13 l8219 august 2002 this is preliminary information on a new product now in development. details are subject to change without notice. n improved step angle splitting & torque n able to drive both windings of bipolar stepper motor n output current up to 1.5a each winding n wide voltage range 10v to 46v n half-step, full-step and microstepp- ing mode n built-in protection diodes n internal pwm current control n low output saturation voltage n designed for unstabilized motor supply voltage n internal thermal shutdown n two power packages are available: - so28ep exposed pad - powerso36 description the l8219 is a bipolar monolithic integrated circuits intended to control and drive both winding of a bipolar stepper motor or bidirectionally control two dc mo- tors.the l8219 with a few external components form a complete control and drive circuit for ls-ttl or mi- croprocessor controlled stepper motor system.the power stage is a dual full bridge capable of sustaining 46v and including four diodes for current recircula- tion.a cross conduction protection is provided to avoid simultaneous cross conduction during switch- ing current direction.an internal pulse-width-modula- tion (pwm) controls the output current to 1.5a with peak start-up current up to 1.75a.wide range of cur- rent control from 1.5a (each bridge) is permitted by means of two logic inputs and an external voltage ref- erence. a phase input to each bridge determines the load current direction.a thermal protection circuitry disables the outputs if the chip temperature exceeds safe operating limits. so28ep powerso36 ordering numbers: L8219LP l8219p product preview high current stepper motor driver block diagram 2bit dac thermal shutdown + - logic r 1 c 1 r c compinp1 i 01 c c i 11 v ref1 v s1 out1a winding 1 out1b r s1 d99in1075a ph1 en1 r 2 c 2 compinp2 ph2 en2 r s2 v ss 2bit dac - + logic r c i 02 c c i 12 v ref2 out2a winding 2 out2b v s2
l8219 2/13 pins connections (top views) out2b r s2 gnd out2a compinp2 gnd vs2 en2 i02 en1 gnd vs1 n.c. compinp1 out1a gnd r s1 out1b 1 3 2 4 5 6 7 8 9 26 25 24 23 22 20 21 19 27 10 28 i12 i01 d99in1074a ph2 vref2 r 2 c 2 vref1 ph1 i11 11 12 13 18 16 17 15 14 vss r 1 c 1 vs1 compinp1 n.c. n.c. out2a n.c. n.c. n.c. compinp2 en2 n.c. i02 ph2 i12 n.c. n.c. en1 gnd 18 16 17 15 6 5 4 3 2 21 22 31 32 33 35 34 36 20 1 19 vs2 gnd d99in1073a out2b gnd r s2 vref2 vss r 2 c 2 9 8 7 28 29 30 out1b r 1 c 1 10 27 n.c. r s1 gnd vref1 i01 ph1 14 12 11 23 25 26 out1a i11 13 24 so28ep powerso36
3/13 l8219 pin function so28 ep powerso36 name description 1 10 out2b bridge-2 ouput connection. the output stage is a "h" bridge formed by four transistors and four diodes connected to ground suitable for switching applications. 2 11 rs2 bridge-2 power stage sink transistors emitter connection.sensing resistor is connected from this pin and ground. 3 12 gnd2 ground 4 13 out2a same as out2b 5 17 compi mp2 bridge-2 an internal low pass filter rccc is integrated. 6 18 vs2 bridge-2 power supply voltage. 7, 21 19,36 gnd ground 8 20 en2 bridge2 when the enable input is set high the bridge is immediately switched-off skipping the delay time of the current control loop turning-off (i0=i1=h) 9 22 i02 bridge-2 logic input to set up the output current level, which is also determined by the sensing resistor and reference voltage(see also functional description and table 1). 10 23 i12 same as i02 (see table 1) 11 24 ph2 bridge-2 this ttl-compatible logic inputs sets the direction of current flow through the load. a high level causes current to flow from output a (source) to output b (sink). a schmitt trigger on this input provides good noise immunity and a delay circuit prevents output stage short circuits during switching. 12 25 vref2 bridge-2 a voltage applied to this pin sets the reference voltage of the comparators, this determinig the output current (also depending on rs and the the two inputs input 0 and input 1). 13 26 r2c2 bridge-2 an external rc network connected to this pin sets the toff time of the higher power transistors.the pulse generator is a monostable triggerd by the output of the comparators (toff = 1.1 rtct) 14 27 vss supply voltage input for the logic circuitry. 15 28 r1c1 bridge-1 same as r2c2. 16 29 vref1 bridge-1 same as vref2 17 30 ph1 bridge-1 same as ph2 18 31 i11 bridge-1 same as i12 19 32 i01 bridge-1 same as i02 20 35 en1 bridge-1 same as en2 22 1 vs1 bridge-1 power supply voltage. 23 2 compinp1 bridge-1 an internal low pass filter rccc is integrated. another rc external network will modify the blanking time (ss functional description) 24 3,4,5,14,15, 16,21,33,34 n.c. not connected 25 6 out1a bridge-1 output connection. the output stage is a "h" bridge formed by four transistors and four diodes connected to ground suitable for switching applications 26 7 gnd ground. 27 8 rs1 bridge-1 power stage sink transistors emitter connection.sensing resistor is connected from this pin and ground. 28 9 out1b same as out1a
l8219 4/13 thermal characteristics - so28ep conditions power dissipated (w) t ambient (?c) thermal j-a resistance (?c/w) 4.4 70 18 3.5 70 23 2.1 70 38 pad layout + ground layers + 16 via hol pcb ref.: 4 layer cm 12 x 12 pad layout + ground layers pcb ref.: 4 layer cm 12 x 12 pad layout + 6cm2 on board heat sink pcb ref.: 2 layer cm 12 x 12 d02in1372 0 0 2 4 6 8 18?c/w 23?c/w 38?c/w 10 20 40 60 80 100 120 140 160 ambient temperature (?c) power dissipated (w) d02in1373
5/13 l8219 thermal characteristics - powerso36 conditions power dissipated (w) t ambient (?c) thermal j-a resistance (?c/w) 5.3 70 15 4.0 70 20 2.3 70 35 pad layout + ground layers + 16 via hol pcb ref.: 4 layer cm 12 x 12 pad layout + ground layers pcb ref.: 4 layer cm 12 x 12 pad layout + 6cm2 on board heat sink pcb ref.: 2 layer cm 12 x 12 d02in1370 0 0 2 4 6 8 15?c/w 20?c/w 35?c/w 10 12 20 40 60 80 100 120 140 160 ambient temperature (?c) power dissipated (w) d02in1371
l8219 6/13 absolute maximum ratings electrical characteristics (t j = 25c, v s = 46v, v ss = 4.75v to 5.25v, v ref = 5v; unless otherwise specified) see fig. 3. symbol parameter value unit v s supply voltage 50 v i o output current (peak) non repetitive ton < 2 m s 2.5 a i o output current repetitive ton < 10 m s 1.75 a v ss logic supply voltage 7 v v in logic input voltage range -0.3 to +7 v v sense sense output voltage 1.5 v t j junction temperature +150 c t op operating temperature range 0 to 70 c t stg storage temperature range -55 to +150 c symbol parameter test condition min. typ. max. unit output drivers (out a or outb) v s motor supply range 10 46 v i cex output leakage current v out = v s v out = 0 - - <1 <-1 100 -100 m a m a v ce(sat) output saturation voltage sink driver, i out = +1a sink driver, i out = +1.5a source driver, i out = -1a source driver, i out = -1.5a - - - - 0.5 0.8 1.8 1.9 0.7 1 1.9 2.1 v v v v i r clamp diode leakage current v r = 50v - <1 50 m a v f clamp diode forward voltage sink diode source diode i f =1.5a 1.6 1.6 2 2 v v i s(on) driver supply current both bridges on, no load - 8 20 ma i s(off) driver supply current both bridges off - 6 15 ma control logic v in(h) input voltage all inputs 2.4 - - v v in(l) input voltage all inputs - - 0.8 v i in(h) input current v in = 2.4v - <1 20 ma i in(l) input current v in = 0.84v - -3 -200 ma v ref reference voltage operating 1.5 - 7.5 v i ss(on) total logic supply current i o = i 1 = 0.8v, no load - 90 120 ma i ss(off) total logic supply current i o = i 1 = 2.4v, no load - 14 20 ma comparators v ref / v sense current limit threshold (at trip point i o = i 1 = 0.8v 9.5 10 10.5 - i o = 2.4v, i 1 = 0.8v 12.7 14.1 15.6 - i o = 0.8v, i 1 = 2.4v 20.7 24.4 28.1 - t off cutoff time r t = 56k w c t = 820pf - 50 m s t d turn off delay fig. 1 - 1 m s protection t j thermal shutdown temperature - 170 - c
7/13 l8219 functional description one l8219 is able to drive both windings of a bipolar stepper motor. internal pwm control circuit sets the current in each motor's winding. the peak current in each winding is sensed and then controlled by an external sensing resistor (rs), a reference voltage (vref), and the 2 bit dac. in addition, varying the vref voltage can be provided a continous control of the peak load current fitting micro-stepping application needs. logic (i 0 and i 1 ) the current level in each motor winding is selected with two digital inputs. (see tab.1) producing four current imax, 70.7%imax, 41%imax and zero current. eight step position can be produced at constant torque setting an half-step mode and selecting 100% current when only one phase is on and 70.7% when two phases are on. when the "phase" signal change or when i 0 =i 1 =h the power bridge is turned off resulting in a fast current decay (see fig.1) through the internal output clamp and flyback diodes. the fast current decay is usefull for half-step and high speed application. if any of the logic inputs is left open, the circuit will treat it as a high level input. due to the internal current control loop (sensing resistor, comparator, monostable) a delay time of ~2 m sec exsist be- tween the input of the digital comand and the real current implementation in the motor's winding. when the dig- ital inputs are set to zero (i 0 =i 1 =l) the average current will be higher then zero for a time period of ~2 m sec; to skip this problem there is the pin " enable " which immediately turn off the bridge. with the i 0 and i 1 digital input signals is also possible to implement the "holding torqu e" (reduced power dissi- pation), or the best "start-up " condition (maximum output current). figure 1. internal pwm current control once an output current level has been set by the digital input the current in the motor winding begins to flow in the bridge (see fig.1) and the max peak current imax can be defined by: imax = vref10 rs. at the same time the voltage on sensing resistor increase and the bridge will be turned off again as soon as the voltage on the sensing resistor is equal to the value set by the dac; at this stage the current recirculates through the ground- clamp diodes and sink transistor implementing the slow current decay. once the "toff" time has expired the source driver is turned on again and the cycle repeat itself keeping the de- sidered average current level. io i1 current leve h l h l h h l l 0% current 41% current 70.7% current 100% current v bb r s drive current recirculation (slow-decay mode) recirculation (fast-decay mode) d99in1004
l8219 8/13 figure 2. figure 3. principle operating sequence 1/2 vsense vref ton td normalized vouta-voutb or voutb-vouta (each winding) toff =11 rtct fs = 1 ton + toff toff ton toff 1 d99in1019 1 i01 i11 i02 i12 -imax imax -imax imax ph1 ph2 im=70.7% im=100% im=41% stand by with holding torque halfstep motor drive motor current phase 1 motor current phase 2 full step motor drive 2 3 4 5 6 7 8 d99in1020a
9/13 l8219 phase this input determines the direction of current flow in the windings, depending on the motor connections. the signal is fed through a schmidt-trigge for noise immunity, and through a time delay in order to guarantee that no short-circuit occurs in the output stage during phase-shift. high level on the phase input causes the motor current flow from out a through the winding to out b. current sensor this part contains a current sensing resistor (r s ), a low pass filter (r c , c c ) and three comparators.only one comparator is active at a time. it is activated by the input logic according to the current level chosen with signals i 0 and i 1 . the motor current flows through the sensing resistor r s . when the current has increased so that the voltage across r s becomes higher than the reference voltage on the other comparator input, the comparator goes high, which triggers the pulse generator. the max peak current imax can be defined by: single-pulse generator the pulse generator is a monostable triggered on the positive going edge of the comparator output. the monostable output is high during the pulse time, t off , which is determined by the time components r t and c t . t off = 1.1 r t c t the single pulse switches off the power feed to the motor winding, causing the winding current to decrease dur- ing t off . if a new trigger signal should occur during t off , it is ignored. output stage the output stage contains four darlington transistors (source drivers) four saturated transistors (sink drivers) and eight diodes, connected in two h bridge. the source transistors are used to switch the power supplied to the motor winding, thus driving a constant current through the winding. v s , v ss , v ref the circuit will stand any order of turn-on or turn-off the supply voltages v s and v ss . normal dv/dt values are then assumed. preferably, v ref should be tracking v ss during power-on and power-off if v s is established. thermal shutdown when the die temperature reach 170c the thermal shutdown internal circuitry turns off the power stage (tristate), once the cause of the die increased temperature will be removed the l8219 re-turns on itself as soon as the die temperature reach 150c. application informations some stepper motors are not designed for continuous operation at maximum current. as the circuit drives a con- stant current through the motor, its temperature might increase exceedingly both at low and high speed opera- tion. also, some stepper motors have such high core losses that they are not suited for switch mode current regulation. unused inputs should be connected to proper voltage levels in order to get the highest noise immu- nity. as the circuit operates with switch mode current regulation, interference generation problems might arise in some applications. a good measure might then be to decouple the circuit with a 100nf capacitor, located near the package between power line and ground. the ground lead between rs, and circuit gnd should be kept as short as possible. a typical application circuit is shown in fig. 4. note that ct must be npo type or similar else. to sense the winding current, paralleled metal film resistors are recommended. i max v ref 10 r s ---------------- - =
l8219 10/13 figure 4. typical application circuit. 100nf toff v ss =5v v s out1 r 1 c 1 i02 i12 ph2 ph1 i11 i01 r 2 c 2 out2 r s1 c omp i np1 m r s 0.5 w 100nf 820pf ct 56k rt 56k rt 820pf ct 100 m f r s2 c omp i np2 d99in1021a r s 0.5 w
11/13 l8219 outline and mechanical data dim. mm inch min. typ. max. min. typ. max. a 2.350 2.650 0.092 0.104 a1 0.100 0.300 0.004 0.012 a2 2.050 2.550 0.080 0.100 b 0.330 0.510 0.013 0.020 c 0.230 0.320 0.009 00.12 d (1) 17.70 18.10 0.696 0.712 d1 according to pad size e (2) 7.400 7.600 0.291 0.299 e1 according to pad size e 1.270 0.05 h 10.00 10.65 0.394 0.419 h 0.250 0.750 0.010 0.029 l 0.400 1.270 0.016 0.05 k 0? (min), 8? (max) ddd 0.100 0.004 (1) dimensions d does not include mold flash, protusions or gate burrs. mold flash, protusions and gate shall not exeed 0.15mm per side . (2) dimensions e does not include inter-lead flash or protusions or gate burrs. inter-lead flash or protusions shall not exeed 0.25mm per side . so28ep 7165357 (hsop28 - exposed pad)
l8219 12/13 dim. mm inch min. typ. max. min. typ. max. a 3.60 0.141 a1 0.10 0.30 0.004 0.012 a2 3.30 0.130 a3 0 0.10 0 0.004 b 0.22 0.38 0.008 0.015 c 0.23 0.32 0.009 0.012 d (1) 15.80 16.00 0.622 0.630 d1 9.40 9.80 0.370 0.385 e 13.90 14.50 0.547 0.570 e 0.65 0.0256 e3 11.05 0.435 e1 (1) 10.90 11.10 0.429 0.437 e2 2.90 0.114 e3 5.80 6.20 0.228 0.244 e4 2.90 3.20 0.114 0.126 g 0 0.10 0 0.004 h 15.50 15.90 0.610 0.626 h 1.10 0.043 l 0.80 1.10 0.031 0.043 n10 (max.) s8 (max.) (1): "d" and "e1" do not include mold flash or protrusions - mold flash or protrusions shall not exceed 0.15mm (0.006 inch) - critical dimensions are "a3", "e" and "g". powerso36 e a2 a e a1 pso36mec detail a d 118 19 36 e1 e2 h x 45? detail a lead slug a3 s gage plane 0.35 l detail b detail b (coplanarity) gc - c - seating plane e3 c n n ? m 0.12 ab b b a h e3 d1 bottom view outline and mechanical data
information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the co nsequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specifications mentioned in this publicati on are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectronics prod ucts are not authorized for use as critical components in life support devices or systems without express written approval of stmicroelectro nics. the st logo is a registered trademark of stmicroelectronics ? 2002 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - brazil - canada - china - finland - france - germany - hong kong - india - israel - italy - japan -malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - united states. http://www.st.com 13/13 l8219

▲Up To Search▲

Price & Availability of L8219LP

	To Download L8219LP Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .