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rev.1.0, sep.17.2 003, page 1 of 11 M54679SP 2-phase stepper motor driver rej03f0052-0100z rev.1.0 sep.17.2003 description the M54679SP is a semiconductor integrat ed circuit that can drive the bipolar stepping moto r directly by controlling the coil-current at low level. features ? wide supply voltage sphere (10 to 35 v) ? bipolar, constant current pwm function. (topside transistors pwm function, maximum current is 0.8 amps.) ? few external components. (this ic can be operated with 1 capacitor and 2 resistances.) ? 4 phases input style (include the protection function of output through current). ? output current charge function (2 bits, 4 type currents). ? thermal protection circuit. ? include flywheel diodes. application ? printer, ppc and facsimile. function the M54679SP is a semiconductor integrated circuit, which can drive to phase stepper motor. it can control the direction of motor current and output motor current (4 steps) by i0, i1 terminals. also, it can drive the two-phase bipolar stepper motor by one ic as it includes two current control circuits. block diagram vm1 ph1a ph1b qr s ph2 a ph2b qr s s1 fref s2 vtm rs1 rs2 out1b out1a out2a out2b vcc vtl vth frequency generator spike current cancel ff1 ff2 current comp1 current comp2 gnd source pwm source pwm p.gnd p.gnd spike current cancel stby standby p.gnd vm2 tsd regout (3.5v) 1.25v 10k 18k vref i0(2) i1(2) i0(1) i1(1)
M54679SP rev.1.0, sep.17.2 003, page 2 of 11 pin configuration (top view) 32 shrink-dip (32p4b) ph1a ph1b vref vcc s1 rs1 out1b out1a p.gnd gnd vm1 i1(1) i0(1) stby regout ph2a ph2b gnd i1(2) i0(2) fref vm2 s2 rs2 out2a out2b n.c nc 1 2 3 4 5 6 7 10 11 12 13 14 15 16 8 9 20 21 22 23 26 27 28 29 30 31 32 17 18 19 24 25 pin functions symbol terminal function vm1, vm2 motor supply voltage power supply for motor driver. out1a, out1b, out2a, out2b, output terminals motor drive output terminals. rs1, rs2 current sensor output current s ensing resistor (rs) connection terminals. vcc power supply control circuit power supply. ph1a, ph1b, ph2a, ph2b phase input output current direction switch terminals. i0(1), i1(1), i0(2), i1(2), output current change output curr ent change (100%, 70%, 31%, 0%) terminals. stby standby input standby input (l: standby, h or open: motor function) terminal. s1, s2 sense inputs input voltag e terminal of comparators. vref vref input reference voltage due to setting output current. regout output of voltage st abilizer output of voltage st abilizer (vout = 3.5 v). fref a capacitor for oscillator a capacitor due to pwm carrier frequency. p.gnd power gnd the gnd terminal of bottom side flywheel diodes.
M54679SP rev.1.0, sep.17.2 003, page 3 of 11 absolute maximum ratings (ta = 25c unless otherwise noted) symbol parameter conditions rating unit vm motor supply voltage ?0.3 to 37 v iout output current per one phase 0.8 a v cc power supply ?0.3 to 7.0 v vlogic logic input voltage ph1a, ph1b, ph2a, ph2b, i0, i1, stby ?0.3 to vcc v vanalog analog input voltage vref s1, s2 ?0.3 to vcc v vrs output current sensing rs1, rs2 1.5 v pd power dissipation 1.7 w tj junction temperature 150 c topr operating temperature ? 20 to 75 c tstg storage temperature ? 40 to 125 c thermal derating curve 1 2 3 01020304050 ambient temperature ta (c) power dissipation pd (w) 60 70 8 0 al board 10 cm 2 c-a = 25c/w ( ) with a heat dissipation board j-c = 25c/w 2.5w 1.7w simple substance (c-a = 48.5c/w) recommended operating conditions limits symbol parameter min. typ. max. unit vcc power supply 4.5 5.0 5.5 v vm motor supply voltage 10 ? 35 v iout output current 50 ? 800 ma t plh rising time of logic inputs ? ? 2.0 s t phl falling time of logic inputs ? ? 2.0 s ton pwm on time 5.0 ? 50 s toff pwm off time 5.0 ? 50 s tsdon thermal shut down ? 160 ? c
M54679SP rev.1.0, sep.17.2 003, page 4 of 11 electrical characteristics (ta = 25c, vcc = 5 v, vm = 24 v unless otherwise noted.) control circuit limits symbol parameter conditions min typ max unit i cc1 stby = h, ph*a = h, ph*b = l (bridge on) 39 56 73 i cc2 stby = h, ph*a = ph*b (bridge off) 20 27 40 i cc3 supply current stby = l (standby condition) 1.5 4.0 6.5 ma im12 motor supply current (standby) stby = l ?10 0 100 a v logich 2.4 ? vcc v logich logic input voltage (ph, i1, i0, stby terminals) note 0?0.6 v i (ph)h vin = 5 v ? ? 10 i (ph)l phase terminal input current vin = 0 v ?20 ?3.0 ? a i (i0, i1)h vin = 5 v ? ? 10 i (i0, i1)l i0, i1 terminal input current vin = 0 v ?400 ?300 ? a i (stby)h vin = 5 v ? ? 10 i (stby)l standby terminal input current vin = 0 v ?400 ?300 ? a i (s) current sensing comparators input current s1 or s2 terminals input current (s = 0 v, vref = 5 v). ?20 ?3.0 ? a v (s) current sensing comparators input voltage sphere s1 or s2 terminals in put voltage sphere 0 ? v ch(h) v i (vref) vref input current input current of vref (vref = 5 v, i0 = i1 = 0 v) ? 500 650 a v (vref) vref input voltage sphere 0 ? vcc v f c oscillation frequency of fref c = 390 pf , fref terminal oscillation 20 30 40 khz vreg voltage stabilizer output iout = ?0.1 ma to +1 ma 3.35 3.50 3.65 v v ch(h) i0 = l, i1 = l, vref = 5 v (vref/10*100%) 475 500 525 mv v ch(m) i0 = h, i1 = l, vref = 5 v (vref/10*70%) 325 350 375 mv v ch(l) current sensing comparators threshold voltage i0 = l, i1 = h, vref = 5 v (vref/10*31%) 139 155 171 mv note: the logic reference voltage depends on the diode, and changes according to the temperature. please consider the change in the temperature when setting the voltage level input to the logic.
M54679SP rev.1.0, sep.17.2 003, page 5 of 11 output circuit (ta = 25c, vcc = 5 v, vm = 24 v unless otherwise noted.) limits symbol parameter conditions min typ max unit vsat output saturation voltage top and bottom at load current 0.6 a ? 1.6 2.2 v ileak output leakage current ?100 ? +100 a v f(h) vf of flywheel diode (top) if = 0.6a ? 1.7 2.3 v v f(l) vf of flywheel diode (bottom) if = 0.6a ? 1.1 1.5 v tdon turn on delay of output ti me until output become on since fref = 2.5 v 0.5 v ?0.52.0 s tdoff turn off delay of output ti me until output become off since vref < s ?2.03.5 s tdstby off delay of standby tim e until output become on since stby = l h ? 3.0 10.0 s tdph phase delay time until output become on since phase = l h ? 3.0 10.0 s function explanation (1) ph inputs make a decision the output function. (ph input of phase 4) ph*a ph*b out*a out*b llo f fo f f hl hl lhlh hho f fo f f *: 1 or 2 note: the outputs shut off under ph*a and ph *b high condition at the same time. (2) output current and terminal of output current setting. i0 i1 output current ratio current sensing comparators threshold voltage (vref = 5 v) l l 100% 500 mv h l 70% 350 mv l h 31% 155 mv hh0% ?
M54679SP rev.1.0, sep.17.2 003, page 6 of 11 (3) equivalent circuit of vref terminal. the equivalent circuit of vref terminal is shown in bellow circuit. as vref terminal needs typical 500 a input current, consider this valu e when vref voltage is set. vref i0 i1 18k 2k 3.5k 0.68k (4) current sensing comparators. the current sensing comparat ors compare the voltage (v rs ) of current sensing resistor and threshold voltage (v ch ) of this comparators, then if v rs > v ch , the comparators output change and shut off the output. (5) oscillation circuit. external capacitor (390 pf typ) is charged and discharged by the constant current and a triangular waveform (v th (fref terminal high voltage) = 2.5 v, v tl (fref terminal low voltage) = 0.5 v) appears to fref terminal. this triangular waveform is a carrier frequency of pwm circuit. the carrier frequency changes if this external capacitor value is changed. M54679SP is designed that the oscillation frequency is 30 khz if the external capacitor value is 390 pf. the oscillation frequency is in inverse proportion to the value of an external capacitor. (6) spike current cancellation. output power transistors go to on, then the spike current appears on the r s (current sensing) in a short time and this is caused by the internal delay time. m5 4679sp has the cancellation circuit of the spike current as the current sensing comparators do not cause error functions. so, the function of current sensing comparators is shut off during 2 s since the output power transistors go to on. (7) ph signal delay circuit. M54679SP has a delay time of 3.0 s until output h-bridge power stage go to on since ph signal change low to high. this delay time is enough short time for the frequency (plus rate) of ph signal and there is no problem in the normal function. (8) rs and s1 or s2 terminal. if s1 or s2 terminal (non-inverted input of the current sens ing comparators) is connected the nearest position of current sensing resistor, the error of the current sensing by m eans of wire resistance on the board will be decreased. (9) voltage stabilizer. M54679SP has a voltage stabilizer of 3.5 v. the reference voltage (vref) can connect the output (regout) of voltage stabilizer directly. in this case, the current capability of the output of voltage stabilizer is 1.0 ma (source current), 0.1 ma (sink current).
M54679SP rev.1.0, sep.17.2 003, page 7 of 11 (10) setting output current. as the output circuit of M54679SP is designed by the bipolar type npn transistors, the current that go through the motor coil is smaller about 15 ma (typical) than the current that go through the current sensing resistor. this is caused by the base current of the power transistors. therefore, be aware this base curr ent when the output current is set. off on off on rs iout mb vm vcc ma ib=15ma(typ. ) iout =irs - ib (11) power gnd terminal. power gnd is connected the anodes of flywheel diodes of bottom side. when the output h-bridge power stage goes to on, as the flyback current go through this gnd terminal, minimize the wire resistor of this gnd on the board.
M54679SP rev.1.0, sep.17.2 003, page 8 of 11 (12) output current timing chart under ph inputs and i0, i1 output conditions. under output current waveforms show the current that a motor driver is going to control, so these do not show the actual current waveforms. the waveform of the current when motor is driv en becomes a corrupted-curved waveform when the current changes due to the inductance of the motor. <4 steps function> (1) (2) (3) (4) ph1a ph1b output current 1 (current of phase 1) output current 2 (current of phase 2) a a b b ph2a ph2b l l 100% 100% 100% 100% a b b (2) (4) (1) (3) ab a b a b ab torque vector ph1a ph1b output current 1 (current of phase 1) output current 2 (current of phase 2) [1][2][3][4][5][6][7][8] a a b b ph2a ph2b <8 steps function> a b b a [1] [2] [3 ] [4 ] [5 ] [ 6] [7 ] [8 ] ab a b a b ab ph1a ph1b output current 1 (current of phase 1) output current 2 (current of phase 2) a a b b ph2a ph2b <16 steps function> a b b a ab a b a b ab 1 2 3 4 5 6 7 8 9 10 11 13 12 15 16 14 12345678910 12 11 13 14 15 16 i0(1),i0(2) i0(1) i1(1) i0(2) i1(2) 31% 70% 100% 0% 70% 100% 0% 100% 0% i1(1),i1(2) i0(1),i0(2) i1(1),i1(2)
M54679SP rev.1.0, sep.17.2 003, page 9 of 11 (13) input terminal symbol equivalent circuit of the circumstance of input terminals remarks stby i0(1) i1(1) i0(2) i1(2) 1k vcc ph1a ph1b ph2a ph2b 1k vcc s1 s2 vcc s vch vref vref i0(1) i1(1) vcc i0(2) i1(2) fref vcc fref
M54679SP rev.1.0, sep.17.2 003, page 10 of 11 application circuit rrs2 rrs1 input input input input vcc vm input input input 390pf input input 0.5 to 1.0 ? 0.5 to 1.0 ? ph1a ph1b vref vcc s1 rs1 out1b out1a p.gnd gnd vm1 i1(1) i0(1) stby regout ph2a ph2b gnd i1(2) i0(2) fref vm2 s2 rs2 out2a out2b n.c nc 1 2 3 4 5 6 7 10 11 12 13 14 15 16 8 9 20 21 22 23 26 27 28 29 30 31 32 17 18 19 24 25 m stepper motor
M54679SP rev.1.0, sep.17.2 003, page 11 of 11 package dimensions sdip32-p-400-1.78 weight(g) ? 2.2 jedec code eiaj package code lead material alloy 42/cu alloy 32p4b plastic 32pin 400mil sdip symbol min nom max a a 2 b b 1 b 2 c e d l dimension in millimeters a 1 0.51 ? ? ? 0.35 0. 3.8 45 0.55 0.9 1.0 1.3 0.63 0.73 1.03 0.22 0.27 0.34 27.8 28.0 28.2 8.75 8.9 9.05 ? 1.778 ? ? 10.16 ? 3.0 ? ? ? 0 15 ? ? ?5.08 e e 1 32 17 16 1 e c e 1 a 2 a 1 b 2 b b 1 e la seating plane d mmp
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