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rev.1.0, sep.19.2003, page 1 of 12 M54679FP 2-phase stepper motor driver rej03f0047-0100z rev.1.0 sep.19.2003 description the M54679FP is a semiconductor integrated circuit designed for stepper motor driver used to printer, ppc and facsimile. features ? wide supply voltage sphere (10 ? 35v). ? bipolar, constant current pwm function. ? (top side 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 change function (2 bits, 4 type currents). ? thermal protection circuit. ? include flywheel diodes. application printer, ppc and facsimile. function the M54679FP is a semiconductor integrated circuit which can drive two 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 include two current control circuits.
M54679FP rev.1.0, sep.19.2003, page 2 of 12 pin configuration outline 42p9r-a 42 39 40 41 1 4 3 2 38 5 37 6 7 36 15 28 16 27 17 26 18 25 19 20 24 23 21 22 M54679FP n.c out2a out2b rs2 s2 vm2 ph2a ph2b fref regout i0(2) i1(2) n.c p.gnd out1a out1b r s 1 s1 vm1 v cc ph1a ph1b stby vref i0(1) i1(1) gnd n.c gnd n.c: no connection 35 34 33 32 31 30 29 8 9 10 11 12 13 14
M54679FP rev.1.0, sep.19.2003, page 3 of 12 block diagram logic vm1 ph1a ph1b logic ph2a ph2b logic logic s1 fref s2 vtm rs1 r s 2 out1b out1a out2a out2b v cc vtl vth frequency generator spike current cancel current comp1 current comp2 gnd source pwm source pwm p.gnd p.gnd spike current cancel stby p.gnd vm2 standby tsd regout (3.5v) 1.25v 10k 18k vref i0(2) i1(2) i0 ( 1 ) i1 ( 1 ) qr s ff1 qr s ff2 pin function terminal symbol function motor supply voltage vm1, vm2 power supply for motor drive. output terminals out1a, out1b, out2a, out2b motor drive output terminals. current sensor rs1, rs2 output current sensing resistor (rs) connection terminals. power supply vcc control circuit power supply. phase input ph1a, ph1b, ph2a, ph2b output current direction switch terminals. output current change i0(1), i1(1), i0(2), i1(2) output current change (100%, 70%, 33%, 0%) terminals. standby input stby standby input (l: standby, h or open: motor function) terminal. sense inputs s1, s2 input voltage terminal of comparators. vref input vref reference voltage due to setting output current. output of voltage stabilizer regout output of voltage stabilizer (3.5v). a capacitor for oscillator fref a capacitor due to pwm carrier frequency. power gnd p.gnd the gnd terminal of bottom side flywheel diodes.
M54679FP rev.1.0, sep.19.2003, page 4 of 12 absolute maximum ratings (ta = 25c unless otherwise noted.) parameter symbol ratings units condition motor supply voltage vm -0.3 37 v output current iout 0.8 a per one phase power supply vcc -0.3 7.0 v logic input voltage vlogic -0.3 vcc v ph1a, ph1b, ph2a, ph2b, i0, i1, stby analog input voltage vanalog -0.3 vcc v vref, s1, s2 output current sensing vrs 1.5 v rs1, rs2 power dissipation pd 2.7 w thermal derating k 46 c/w under board mount condition. junction temperature tj 150 c operating temperature topr -20 75 c storage temperature tstg -40 125 c thermal derating 1.0 2.0 3.0 4.0 5.0 6.0 ( watts ) 0 25 50 75 100 125 150 using j-type board 2.7 watts power dissipation (pdp) ambient temperature ( c ) recommended operating conditions limits parameter symbol min. typ. max. unit power supply vcc 4.5 5.0 5.5 v motor supply voltage vm 10 ? 35 v output current iout 50 ? 800 ma rising time of logic inputs tplh ? ? 2.0 s falling time of logic inputs tphl ? ? 2.0 s pwm on time ton 5.0 ? 50 s pwm off time toff 5.0 ? 50 s thermal shut down tsdon ? 160 ? c
M54679FP rev.1.0, sep.19.2003, page 5 of 12 electrical characteristics (ta = 25 c, vcc = 5.0v, vm = 24v unless otherwise noted.) control circuit limits parameter symbol min. typ. max. unit conditions supply current icc1 39 56 73 stby = h, ph*a = h, ph*b = l (bridge on) icc2 20 27 40 ma stby = h, ph*a = ph*b (bridge off) icc3 2.0 4.0 6.0 stby = l (standby condition) vlogic h 2.4 ? vcc v logic input voltage (ph, i1, i0, stby terminals) vlogic l 0 ? 0.6 phase terminal input current i(ph) h ? ? 10 a vin = 5v i(ph) l 20 3.0 ? vin = 0v i0, i1 terminals input current i(i0, i1) h ? ? 10 a vin = 5v i(i0, i1) l 400 300 ? vin = 0v i(stby) h ? ? 10 a vin = 5v standby terminal input current i(stby) l 400 300 5.0 vin = 0v current sensing comparators input current i(s) 20 3.0 ? a s1 or s2 terminals input current (s1 or s2 = 0v, vref = 5v). current sensing comparators input voltage sphere v(s) 0 ? vch(h) v s1 or s2 terminal input voltage sphere vref input current i(vref) ? 500 650 a input current of vref (vref = 5v, i0 = i1 = 0v) vref input voltage sphere v(vref) 0 ? vcc v oscillation frequency of fref fc 20 30 40 khz c = 390pf, fref terminal oscillation voltage stabilizer output vreg 3.35 3.50 3.65 v iout = -0.1ma +1ma vch(h) 475 500 525 mv i0 = l, i1 = l, vref = 5v (vref/10*100%) vch(m) 325 350 375 mv i0 = h, i1 = l, vref = 5v (vref/10*70%) current sensing comparators threshold voltage vch(l) 139 155 171 mv i0 = l, i1 = h, vref = 5v (vref/10*33%) output circuit (ta = 25 c, vcc = 5.0v, vm = 24v unless otherwise noted.) limits parameter symbol min. typ. max. unit conditions output saturation voltage vsat ? 1.6 2.2 v top and bottom at load current 0.6a. output leakage current ileak 100 ? +100 a vf of flywheel diode (top) vf(h) ? 1.7 2.3 v if = 0.6a vf of flywheel diode (bottom) vf(l) ? 1.1 1.5 v if = 0.6a turn on delay of output tdon ? 0.5 2.0 s time until output become on since s > vref turn off delay of output tdoff ? 2.0 3.5 s time until output become off since s < vref
M54679FP rev.1.0, sep.19.2003, page 6 of 12 function explanation 1. ph inputs make a decision the output function. ph*a ph*b out*a out*b l l off off h l h l l h l h h h off off * : 1 or 2 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=5v) l l 100% 500mv h l 70% 350mv l h 30% 155mv h h 0% ? 3. equivalent circuit of vref terminal. the equivalent circuit of vref terminal is shown in right circuit. as vref terminal needs typical 500 a input current, consider this value when vref voltage is set. 4. current sensing comparators. the current sensing comparators compare the voltage (vrs) of current sensing resistor and threshold voltage (v ch ) of this comparators, then if vrs > v ch , the comparators output change and shut off the output. vref i0 i1 18k 2k 3.5k 0.68k
M54679FP rev.1.0, sep.19.2003, page 7 of 12 5. oscillation circuit. external capacitor is charged and discharged by the constant current and a triangular waveform appears to vref terminal. the waveform voltage level is shown in right figure. this triangular waveform is a carrier frequency of pwm circuit. the carrier frequency change if this external capacitor value is changed. M54679FP is designed that the oscillation frequency is 30khz if the external capacitor value is 390pf. the oscillation frequency is in inverse proportion to the value of a external capacitor. 0.5v 2.5v 6. spike current cancellation. output power transistors go to on, then the spike current appears on the rs (current sensing) in a short time and this is caused by the internal delay time. M54679FP 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 are shut off during 2 ms since the output power transistors go to on. 7. ph signal delay circuit. M54679FP 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 sensing comparators) is connected the nearest position of current sensing resistor, the error of the current sensing by means of wire resistance on the board will be decreased. 9. voltage stabilizer. M54679FP has a voltage stabilizer of 3.5v. 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 1.0ma (source current), 0.1ma (sink current). 10. setting output current. as the output circuit of M54679FP is designed by the bipolar type npn transistors, the current that go through the motor coil is smaller about 15ma (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 current when the output current is set.
M54679FP rev.1.0, sep.19.2003, page 8 of 12 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. off on off on r s iout mb ma vm v cc ib = 15ma (typ.) iout = irs - i b
M54679FP rev.1.0, sep.19.2003, page 9 of 12 12. output current timing chart under ph inputs and i0, i1 output conditions. under output current wave forms show the current that a motor driver is going to control, so these do not show the actual current wave forms. (1) ( 2 ) ( 3 ) ( 4 ) ph1a ph1b a b ph2a ph2b l l 100% 100% 100% 100% i0 ( 1 ) ,i0 ( 2 ) i1 ( 1 ) ,i1 ( 2 ) <4 steps function> output current 1 ( current of phase 1 ) output current 2 (current of phase 2) b a a b ( 4 ) ab ab 100% 0% torque vector (1) (2) ( 3 ) ab b ba <8 steps function> a b b a 1 2 3 4 5 6 7 8 ph1a ph1b ph2a ph2b i0 ( 1 ) ,i0 ( 2 ) i1 ( 1 ) ,i1 ( 2 ) output current 1 ( current of phase 1 ) output current 2 (current of phase 2) 12345678910 12 11 13 14 15 16 <16 steps function> output current 1 ( current of phase 1 ) output current 2 (current of phase 2) ph1a ph1b ph2a ph2b i0 ( 1 ) i1 ( 1 ) i0 ( 2 ) i1 ( 2 ) a b b a 1 2 3 4 5 6 7 8 9 10 11 13 12 15 16 14 31% 70% 100% 0% a b ab ab b ba ab a 70% 100% 0% 1 2 6 8 4 5 7 3 a b ab ab b ba ab a
M54679FP rev.1.0, sep.19.2003, page 10 of 12 13. inputs terminals. symbol equivalent circuit of the circumstance of input terminals. remarks pin: stby pin: i0(1) pin: i1(1) pin: i0(2) pin: i1(2) 18 20 21 23 22 pin: ph1a pin: ph1b pin: ph2a pin: ph2b 16 17 27 26 pin: s1 pin: s2 6 37 pin: vref 19 1k v cc 1k v cc v cc i0 ( 1 ) i1 ( 1 ) v cc i0 ( 2 ) i1 ( 2 )
M54679FP rev.1.0, sep.19.2003, page 11 of 12 symbol equivalent circuit of the circumstance of input terminals. remarks fref v cc fref application circuit stepper motor m rrs2 v cc rrs1 input input input input vm ph1a ph1b regout vref v cc s1 rs1 out1b out1a p.gnd gnd vm1 ph2a ph2b vm2 s2 rs2 out2a out2b gnd 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 m54679f p 19 20 21 22 23 24 i1 ( 1 ) i0 ( 1 ) i1 ( 2 ) i0 ( 2 ) fref n.c n.c n.c stby input input input 390pf input input 0.5 1.0 ? 0.5 1.0 ?
M54679FP rev.1.0, sep.19.2003, page 12 of 12 package dimensions hssop42-p-450-0.8 weight(g) ? jedec code ? eiaj package code lead material cu alloy 42p9r-a plastic 42pin 450mil hssop symbol min nom max a a 2 b c d e l l 1 y dimension in millimeters h e a 1 i 2 ? ? .270 0 .230 .3 17 .28 ? .63 11 .30 ? ? ? .271 .10 ? .02 .320 .250 .517 .48 .80 .9311 .50 .7651 ? ? .4311 ? .20 .22 ? .370 .30 .717 .68 ? .2312 .70 ? .10 x ? .16 0 ? ? b 2 ? 0.5 ? 0? 10? e e 1 recommended mount pad f a e h e 1 21 22 42 a 2 a 1 c l 1 l l 2 b 2 e 1 e d e y detail f z z 1 detail g z 1 0.75 0.9 z b x m g mmp
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