rev.1.0, sep.19.2003, page 1 of 8 M54678FP 2-phase stepper motor driver rej03f0046-0100z rev.1.0 sep.19.2003 description the M54678FP is a semiconductor integrated circuit designed for stepper motor driver used to printer, ppc and facsimile. features ? wide supply voltage range (10 ? 35v) ? output current is controlled by pwm operation ? few external components (this ic can be operated with 1 capacitor and 2 resistances) ? voltage stabilizer circuit (regout = 3.5v) ? thermal protection circuit ? flywheel diode application printers, ppc, facsimile function the M54678FP is a integrated circuit which can drive two phase stepper motor. the output current direction is determined by phase terminal function, and the output current level is controlled by vref terminals voltage.
M54678FP rev.1.0, sep.19.2003, page 2 of 8 pin configuration outline 36p2r-d 36 33 34 35 1 4 3 2 32 5 31 6 28 9 27 10 26 11 25 12 13 14 24 23 7 8 30 29 15 22 16 21 17 20 18 19 M54678FP n.c out2 out2b rs2 s2 vm n.c n.c ph2 en2 vref2 fref p.gnd out1 out1b rs1 s1 vm n.c v cc ph1 en1 vref1 regout gnd gnd n.c: no connection block diagram logic delay delay vm ph1 en1 delay logic delay ph2 en2 logic logic vref1 s1 fref vref2 s2 vtm rs1 rs2 out1 out1b out2 out2b v cc vtl vth regout regulator(3.5v) 1.25v 10k 18k frequency generator spike current cancel qr s ff1 current comp1 current comp2 gnd source pwm source pwm p.gnd p.gnd spike current cancel qr s ff2
M54678FP rev.1.0, sep.19.2003, page 3 of 8 pin function terminal symbol functions output stage supply voltage vm power supply for motor working output terminal out1, out1b, out2, out2b motor drive output terminal current sensor rs1,rs2 output current sensing resistor (rs) connect terminal power supply vcc control circuit power supply phase input ph1, ph2 output current direction switch enable input en1, en2 l input motor on h input enable sense input s1, s2 comparator input voltage terminal vref input vref1, vref2 comparator reference voltage terminal voltage stabilizer output regout constant voltage output (vout = 3.5v) absolute maximum ratings (ta = 25 c unless otherwise noted.) parameter symbol ratings unit condition output stage supply voltage vm -0.3 37 v output current iout 1.0 a 1 phase supply voltage vcc -0.3 7 v logic input voltage vlogic -0.3 vcc v ph, en pin analog input voltage vanalog -0.3 vcc v vref, s pin current sensor voltage vrs 1.5 v rs pin power dissipation pd 2.0 w 100mm 100mm, t = 1.6mm glassfiber epoxy resin circuit board thermal derating k 6.25 c/w 100mm 100mm, t = 1.6mm glassfiber epoxy resin circuit board junction temperature tj 150 c operating temperature topr -20 75 c storage temperature tstg -40 125 c recommended operating conditions limits parameter symbol min. typ. max. unit supply voltage vcc 4.5 5.0 5.5 v output stage supply voltage vm 10 ? 35 v output current iout 50 ? 800 ma logic input rise time tplh ? ? 2 s logic input fall time tphl ? ? 2 s pwm on time ton 5 ? 50 s pwm off time toff 5 ? 50 s thermal shutdown temperature tsdon ? 160 ? c
M54678FP rev.1.0, sep.19.2003, page 4 of 8 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 19 33 50 ma vcc = 5v, en = h icc2 34 58 87 vcc = 5v, en = l vih 2.4 ? vcc v logic input voltage (ph, en terminal) vil 0 ? 0.6 iih e 5 ? 5 a vin = 5v logic input current (ph, en terminal) iil e 20 ? 5 vin = 0v comparator input offset voltage ic e 5 +1 +7 mv vref = 500mv, vch = vref-s comparator input current ic e 20 e 5 ? a s terminal input current s = 0v, vref = 500mv comparator input voltage range vc 0 ? 1.5 v vref input current iref e 20 e 5 ? a vref terminal input current vref = 0v, 2 = 500mv ?j vref input voltage range vref 0 ? 1.5 v fref terminal output voltage frefh 2.4 2.5 2.6 v fref terminal frefl 0.4 0.5 0.6 fref oscillation frequency fc 20 30 40 khz fref terminal, c = 390pf regulator output voltage vreg 3.4 3.5 3.6 v iout = -0.1ma e +1ma 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 ? 1.8 2.6 v sensing resistor not included. io = 0.75a output leak current ileak e 100 ? +100 a output turn-on delay tdon ? 0.5 2.0 s time until output on after fref 2.5v 0.5v output turn-off delay tdoff ? 2.0 3.5 s time until output off after s < vref application directions (1) ph input, en input determines output function. ph*a ph*b out*a out*b h l h l l l l h h h z z l h z z * : 1 or 2 z : high impedance
M54678FP rev.1.0, sep.19.2003, page 5 of 8 (2) vref (reference voltage) output current level is controlled by vref voltage. (3) current comparator under vrs (current sensing resistor voltage) > vref (reference voltage) condition, the current comparator switches, fip-flop is reset and output circuit is set to off. (4) oscillating circuit frequency of pwm operation synchronize with fref terminal frequency. if you change frequency of pwm operation, please change capacitor value of fref terminal. this ic is designed oscillating frequency to be 30khz when capacitor = 390pf is connected to fref terminal. oscillating frequency is inversely proportional to capacitor value. when capacitor value become half, oscillating frequency will be two times. (5) spike current cancellation circuit this ic includes spike cancellation circuit to prevent the failure function of current comparator by influence of this spike current. thus, current comparator don?t function during approximately 2 ms from the moment of output transistor is set to on. (6) phase delay circuit this ic includes phase delay circuit to prevent output through current at ph switching time. four output transistors of h bridge don?t function during approximately 3 ms at ph switching time. (7) rs terminal and s terminal difference of current sensing that caused by wiring resistance of board (wiring resistance between rs terminal and current sensing resistor) can be prevented by connecting s terminal (plus input of current comparator) to current sensing resistor as close as possible. (8) voltage stabilizer circuit this ic includes voltage stabilizer circuit. (3.5volts output). vref reference voltage can be generated by resistance potential dividing from constant voltage output terminal (regout). current capability of constant voltage output terminal is i source = +1ma, i sink = -0.1ma (9) setting of output current since output circuit of this ic consists of npn type transistor, current flow through the motor coil (iout) becomes approximately 20ma (typical value) smaller than current flow through the current sensing resistor (irs) by influence of the base current (ib) of transistor. thus, please consider this current when you set up output current. off on off on rs iout mb ma vm v cc ib = 10ma (typ.) iout = irs - ib *if vcc, tj and manufacturing dispersion are considered, dispersion of ib will vary maximum 5ma (minimum = 5ma, maximum = 15ma)
M54678FP rev.1.0, sep.19.2003, page 6 of 8 thermal derating 0 25 50 75 100 125 150 1.0 2.0 3.0 4.0 5.0 1.2 4.5 power dissipation pdp (w) ( *1 ) : mounted on 100mm 100mm, t = 1.6 m ( copper foil = 35 m ) circuit board ambient temperature ta ( c) with infinite heat sink without heat sink mounted on circuit board ( *1 )
M54678FP rev.1.0, sep.19.2003, page 7 of 8 application circuit rrs1, rrs2 = 0.5 1.0 ? cfref = 390pf stepper motor an example of the setting 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 M54678FP n.c ph1 en1 regout vref1 vcc s1 rs1 out1b out1 p.gnd n.c n.c ph2 en2 fref vref2 vm2 s2 rs2 out2 out2b vm1 n.c gnd gnd m rrs2 vcc rrs1 cfref input input input input vm 3.5v
M54678FP rev.1.0, sep.19.2003, page 8 of 8 package dimensions ssop36-p-450-0.80 weight(g) ? jedec code 0.53 eiaj p a c kage code lead mater ial cu allo y 36p2r-d plastic 36pin 450mil ssop symbol min nom max a a 2 b c d e l l 1 y dimension in millimeters h e a 1 i 2 ? ? .3 0 0 .18 0 .8 14 .2 8 ? .63 11 .3 0 ? ? ? .27 1 .1 0 ? .05 2 .35 0 .2 0 .0 15 .4 8 .8 0 .93 11 .5 0 .765 1 ? .43 11 ? .2 0 .35 2 ? .45 0 .25 0 .2 15 .6 8 ? .23 12 .7 0 ? .15 0 ? ? b 2 ? ? 0? 8? e e 1 36 19 18 1 h e e d e y f a a 2 a 1 l 1 l c e b 2 e 1 i 2 recommended mount pad detail f z 1 0.7 0.5 0.85 z b g z z 1 detail g mmp
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