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33110 sy 20100310-s00001 no.a1685-1/12 http://onsemi.com semiconductor components industries, llc, 2013 june, 2013 LV8711T overview the LV8711T is a pwm constant-current control stepping motor driver. features ? two circuits of pwm constant-current control h-bridge drivers incorporated ? control of the stepping motor to 1-2 phase excitations possible ? reference voltage output: 1.0v ? short circuit protection circuit incorporated ? abnormal condition warning output pin incorporated ? upper and lower regenerative diodes incorporated ? thermal shutdown circuit incorporated specifications absolute maximum ratings at ta = 25 c parameter symbol conditions ratings unit motor supply voltage vm max 18 v logic supply voltage v cc max 6 v logic input voltage v in 6 v output peak current i o peak per ch, tw 10ms, duty 20% 1.0 a output continuous current i o max per ch 800 ma allowable power dissipation pd max * 1.45 w operating temperature topr -20 to +85 c storage temperature tstg -55 to +150 c * specified circuit board : 57.0mm 57.0mm 1.7mm, glass epoxy printed circuit board. bi-cmos lsi pwm constant-current control stepping motor driver orderin g numbe r : ena1685 stresses exceeding maximum ratings may damage the device. maximum ratings are stress ratings only. functional operation above the recommended oper ating conditions is not implied. extended exposure to stresses above the recommended operating conditions may affect device reliabili ty.
LV8711T no.a1685-2/12 recommended operating ratings at ta = 25 c parameter symbol conditions ratings unit motor supply voltage range vm 4 to 16 v logic supply voltage range v cc 2.7 to 5.5 v logic input voltage range v in -0.3 to v cc +0.3 v vref input voltage range vref 0 to v cc -1.8 v electrical characteristics at ta = 25c, vm = 12v, v cc = 3.3, vref = 1.0v ratings parameter symbol conditions min typ max unit general imstn ps = ?l?, no load 1 a standby mode current drain i cc stn ps = ?l?, no load 1 a im ps = ?h?, no load 1.0 1.5 ma current drain i cc ps = ?h?, no load 1.7 3.0 ma thermal shutdown temperature tsd design guarantee 150 180 c thermal hysteresis width tsd design guarantee 40 c v cc low voltage cutting voltage vthv cc 2.1 2.4 2.7 v low voltage hysteresis vo ltage vthhys 100 130 160 mv reference voltage reg5 output voltage vreg5 4.5 5 5.5 v output ronu i o = -800ma, source-side 0.78 1.0 output on resistance rond i o = 800ma, sink-side 0.32 0.43 output leakage current i o leak v o = 15v 10 a diode forward voltage vd id = -800ma 1.0 1.2 v logic input i in l v in = 0.8v 4 8 12 a logic pin input current i in h v in = 3.3v 22 33 45 a logic high-level input voltage v in h 2.0 v logic low-level input voltage v in l 0.8 v constant-current control reg1 output voltage vreg1 0.95 1.0 1.05 v vref input current i ref vref = 1.0v -0.5 a vtatt00 vref = 1. 0v 0.192 0.200 0.208 v vtatt01 vref = 1. 0v 0.152 0.160 0.168 v vtatt10 vref = 1. 0v 0.092 0.100 0.108 v current setting reference voltage vtatt11 vref = 1. 0v 0.032 0.040 0.048 v chopping frequency fchop cchop = 220pf 36 45 54 khz v chop h 0.6 0.7 0.8 v chop pin threshold voltage v chop l 0.17 0.2 0.23 v chop pin charge/discharge current ichop 7 10 13 a output short-circuit protection emo pin saturation voltage vsatemo i emo = 1ma 250 400 mv
LV8711T no.a1685-3/12 package dimensions unit : mm (typ) 3260a pin assignment sanyo : tssop24(225mil) 6.4 0.5 4.4 (0.5) (1.0) 6.5 0.5 0.15 1 12 24 13 0.22 0.08 1.2max ambient temperature, ta - c allowable power dissipation, pd max - w pd max - ta 0 0.5 1.0 2.0 1.45 0.754 - 20 40 60 80 20 0 100 specified circuit board : 57.0 57.0 1.7mm 3 glass epoxy board 1.5 vm nc reg5 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 LV8711T ps emo vref reg1 att1 att2 chop v cc gnd in1a in1b out1a rnf1 out1b vmm out2a rnf2 out2b pgnd in2a in2b
LV8711T no.a1685-4/12 block diagram output preamplifier stage output control logic output preamplifier stage output preamplifier stage output preamplifier stage standard voltage start circuit att1 att2 pgnd emo in2b in2a ps chop tsd lvs vref gnd v cc rnf1 out1a out1b out2a out2b rnf2 vmm + - + - + - reg5 in1b in1a + - reg1 vm output control logic standard voltage circuit current switch function current switch function constant current control constant current control gate for upside output voltage circuit oscillator
LV8711T no.a1685-5/12 pin functions pin no. pin name pin function equivalent circuit 8 9 13 14 23 24 att1 att2 in2b in2a in1b in1a energization current switching pin 1. energization current switching pin 2 channel 2 driver output control input pin. channel 2 driver output control input pin. channel 1 driver output control input pin. channel 1 driver output control input pin. v reg5 gnd v cc 4 ps enable input pin. v cc gnd 4 16 17 18 20 21 22 out2b rnf2 out2a out1b rnf1 out1a channel 2 outb output pin. channel 2 current sensing resistor connection pin. channel 2 outa output pin. channel 1 outb output pin. channel 1 current sensing resistor connection pin. channel 1 outa output pin. gnd 21 17 vm 18 22 16 20 3 reg5 internal reference voltage output pin. gnd 3 v cc continued on next page.
LV8711T no.a1685-6/12 continued from preceding page. pin no. pin name pin function equivalent circuit 5 emo abnormal condition warning output pin. sgnd 5 v cc 6 vref channel 1 and 2 current setting reference voltage input pin. gnd 6 v cc 7 reg1 current setting reference voltage output pin. gnd 7 vreg5 10 chop chopping frequency setting capacitor connection pin. gnd 10 v cc
LV8711T no.a1685-7/12 input pin function (1) chip enable function standby mode / operating mode of the ic are switched by setting the ps pin. in the standby-state, the ic enters a power saving mode and all logic is reset. in the standb y-state, internal regulator circuit is not operative. ps condition internal regulator low or open standby mode standby high operating mode operating (2) stm output control logic parallel input output in1a(2a) in1b(2b) out1a(2a) out1b(2b) current direction low low off off output off high low high low outa to outb low high low high outb to outa high high low low brake(dcm mode) (3) constant-current setting the constant-current control setting consist of the vref voltage setting and resistor (rnf) connected between rnf and ground. the current is set acco rding to the following equation. i out [a] = vref [v] / 5 / rnf [ ? ] also, the voltage applied to the vref pin can be switched to four stages settings by the state of two inputs of the att1 and att2 pins. this function is effective for powe r saving when the motor holding current is applied. attenuation function of the vref input voltage att1 att2 current setting reference voltage attenuation ratio low low 100% high low 80% low high 50% high high 20% the output current calculation method for using of attenuation function of the vref input voltage is as below. i out = (vref / 5) attenuation ratio / rnf resistance e.g. when the vref is 1.0v and the set reference voltage is 100% [(att1, att2) = (low, low)] and the rnf resistance is 0.47 ? , the following output current is set. i out = 1.0v / 5 100% / 0.47 ? = 425ma in this conditions, when (att1, att2) is set to (high, high), i out = 425ma 20% = 85ma therefore, the power saving is exec utable by attenuation of the output current when motor holding current is supplied. (4) setting the chopping frequency for constant-current control, chopping operation is made with the frequency determined by the external capacitor (connected to the chop pin). the chopping frequency to be set with the capacitor connected to the chop pin (pin 10) is as shown below. chopping period: tchop tchop c v 2 / i [s] v: threshold voltage typ, 0.5v i : charge / discharge current typ. 10 a chopping frequency: fchop fchop 1 / tchop [hz]
LV8711T no.a1685-8/12 (5) constant-current control time chart (chopping operate) in each current mode, the operation sequence is as described below: ? at first of chopping cycle, the ic goes to charge mode. (the blanking section in which the charge mode is forced regardless of the magnitudes of the coil current (i coil ) and the set current (i ref ) exists for 1 s.) ? in blanking section, the ic compares the coil current (i coil ) and the set current (i ref ). if the i coil < i ref state is existent in blanking section. charge mode continues until i coil i ref . after that the ic switches to slow decay mode and then switches to fast decay mode for the last about 1 s. if the i coil < i ref state is non-existent in blanking section. the ic switches to slow decay after blanking s ection, and then switche s to fast decay mode for the last about 1 s. the ic repeats the above operation. fast slow charge coil current set current forced charge section chopping cycle current mode fast slow charge coil current set current current mode forced charge section chopping cycle
LV8711T no.a1685-9/12 (6) typical current waveform in each excitation mode 6-1) stm drive mode two-phase excitation (cw mode) 1-2 phase excitation (cw mode) in1a in1b in2a in2b i out 1 i out 2 (%) -100 -100 100 (%) 100 0 0 in1a in2a in1b in2b l out 1 l out 2 -100 -100 0 0 (%) 100 (%) 100
LV8711T no.a1685-10/12 6-2) dcm drive mode (7) output short-circuit protection to protect ic from damage due to short-circuit of the output caused by lightening or ground fault, the output short-circuit protection circuit to put the output in the off mode is incorporated. 7-1) protective function operation (latch method) when detecting the output short-circuit state, the short-circuit protection circuit is activated. when short-circuit state is detected 4 s (count by the internal timer), detected output is off at the time. then, when the output exceeds the timer latch time counted by the internal counter, the output is on. still, the short circuit state is detected, the ic switches all output to stand-by mode and keep the state. this state is released by setting ps = low (8) abnormal condition warning output pin emo, warning output pin of thermal shutdown circuit and the output short-circuit protection circuit, is an open-drain output. emo outputs on when output short-circuit is detected. when detecting the output overdrive, the emo outputs on. if the junction temperature goes down at the time, emo outputs off automatically. (9) recommended power-on sequence provide a wait time of 10 s or more after v cc power supply rises before supplying vm power supply. provide a wait time of 10 s or more after vm power supply raises before setting the ps pin high. the above power-on sequence is only a re commendation, and there are no risks of damage or over current to the ic even if this sequence is not followed. v cc vm ps in1a(2a) in1b(2b) l out 1(2) -100 0 (%) 100 (%) off cw brake ccw brake
LV8711T no.a1685-11/12 application circuit example each constant setting method for the above circuit diagram example is as follows : current limit (100%) set vref = 1.0v (when internal regulator output is connected) i limit = vref / 5 / rnf resistance = 1.0v / 5 / 0.47 = 425ma chopping frequency setting fchop = ichop / (cchop vt 2) = 10 a/ (220pf 0.5v 2) = 45 khz 220pf m reg5 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 LV8711T ps emo vref reg1 att1 att2 chop v cc gnd in1a in1b out1a rnf1 out1b vmm out2a rnf2 out2b pgnd in2a in2b nc vm logic input abnomal condition sensing monitor it is a pull-up resistor for abnomal condition sensing monitor. the setting range is 10k? to 100k? the reg1 voltage (1v) can be used to set output current. it can connect to vref directly or after divided with resistors. the setting range (total) is 10k? to 100k? please refer to p.7 for details. it sets the pwm frequency. the setting range is 100pf to 500pf please refer to p.8 for details. logic input logic input it is a resistor to detect output current the setting range is 0.1? to 1? please refer to p.7 for details.
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