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MITSUBISHI
M54678FP
2-PHASE STEPPER MOTOR DRIVER
DESCRIPTION
The M54678FP is a semiconductor integrated circuit designed for stepper motor driver used to printer, PPC and facsimile.
PIN CONFIGURATION (TOP VIEW)
P.GND Out1 Out1B Rs1 S1 Vm 1 2 3 4 5 6 7 36 35 34 33 32 31 30 29 28 GND 27 26 25 24 23 22 21 20 19 N.C N.C Ph2 En2 Vref2 Fref N.C Out2 Out2B Rs2 S2 Vm
FEATURES
q Wide supply voltage range (10 - 35V) q Output current is controlled by PWM operation q Few external components (This IC can be operated with 1 capacitor and 2 resistances) q Voltage stabilizer circuit (Regout = 3.5V) q Thermal protection circuit q Flywheel diode
APPLICATION
Printers, PPC, facsimile
8 9 GND 10 11 12 N.C VCC Ph1 En1 Vref1 Regout 13 14 15 16 17 18
M54678FP
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.
Outline 36P2R-D
N.C: no connection
BLOCK DIAGRAM
Out1 Out1B Vm Out2 Out2B
Ph1 En1
Ph2 En2
Delay
Source PWM
Delay
Delay
Source PWM
Delay
Logic
Logic
Logic
Logic
P.GND
P.GND
VCC
Spike current cancel
Current comp1
RQ FF1 S
QR FF2 S
Spike current cancel
Regulator(3.5V) Current comp2 VTH VTL 1.25V Regout
Frequency Generator
10K
18K
VTM
Rs1
S1
Vref1
Fref
Vref2
S2
Rs2
GND
MITSUBISHI
M54678FP
2-PHASE STEPPER MOTOR DRIVER
PIN FUNCTION
Symbol Vm Out1, Out1B, Out2, Out2B Rs1,Rs2 VCC Ph1, Ph2 En1, En2 S1, S2 Vref1, Vref2 Regout Terminal Output stage supply voltage Output terminal Current sensor Power supply Phase input Enable input Sense input Vref input Voltage stabilizer output Functions Power supply for motor working Motor drive output terminal Output current sensing resistor (Rs) connect terminal Control circuit power supply Output current direction switch "L" input Motor on "H" input Enable Comparator input voltage terminal Comparator reference voltage terminal Constant voltage output (Vout = 3.5V)
ABSOLUTE MAXIMUM RATINGS (Ta = 25C unless otherwise noted.)
Symbol Vm Iout VCC Vlogic Vanalog VRs Pd K Tj Topr Tstg Parameter Output stage supply voltage Output current Supply voltage Logic input voltage Analog input voltage Current sensor voltage Power dissipation Thermal derating Junction temperature Operating temperature Storage temperature Conditions Ratings -0.3 - 37 1.0 -0.3 - 7 -0.3 - VCC -0.3 - VCC 1.5 2.0 62.5 150 -20 - 75 -40 - 125 Unit V A V V V V W C/W C C C
1phase Ph, En Pin Vref, S Pin Rs Pin 100mm x 100mm, t = 1.6mm glassfiber epoxy resin circuit board 100mm x 100mm, t = 1.6mm glassfiber epoxy resin circuit board
RECOMMENDED OPERATIONAL CONDITIONS
Symbol VCC Vm Iout tPLH tPHL Ton Toff TSDon Parameter Supply voltage Output stage supply voltage Output current Logic input rise time Logic input fall time PWM on time PWM off time Thermal shutdown temperature Min. 4.5 10 50 -- -- 5 5 -- Limits Typ. 5.0 -- -- -- -- -- -- 160 Max. 5.5 35 800 2 2 50 50 -- Unit V V mA S S S S C
MITSUBISHI
M54678FP
2-PHASE STEPPER MOTOR DRIVER
ELECTRICAL CHARACTERISTICS (Ta=25C, VCC=5V, VM=24V unless otherwise noted.) CONTROL CIRCUIT
Symbol ICC1 ICC2 VIH VIL IIH IIL VCH IC VC Iref Vref FrefH FrefL Fc Vreg Parameter Supply current Logic input voltage (Ph, En terminal) Logic input current (Ph, En terminal) Comparator input offset voltage Comparator input current Comparator input voltage range Vref input current Vref input voltage range Fref terminal output voltage Fref oscillating frequency Regulator output voltage Fref terminal Fref terminal, C = 390pF Iout = -0.1mA - +1mA Vref terminal input current Vref = 0V, 2 = 500mVAj Vin = 5V Vin = 0V Vref = 500mV, VCH = Vref-S S terminal input current S = 0V, Vref = 500mV Test condition VCC = 5V, En = H VCC = 5V, En = L Min. 19 34 2.4 0 -5 -20 -5 -20 0 -20 0 2.4 0.4 20 3.4 Limits Typ. 33 58 -- -- -- -- +1 -5 -- -5 -- -- 2.5 0.5 30 3.5 Max. 50 87 VCC 0.6 5 5 +7 -- 1.5 -- 1.5 2.6 0.6 40 3.6 Unit mA V A mV A V A V V kHz V
*Fref oscillating frequency is Career frequency of Output PWM control.
OUTPUT CIRCUIT (Ta=25C, VCC=5V, VM=24V unless otherwise noted.)
Symbol Vsat Ileak tdon tdoff Parameter Output saturation voltage Output leak current Output turn-on delay Output turn-off delay Test condition Sensing resistor not included. Io = 0.75A Time until output on after Fref 2.5V 0.5V Time until output off after S < Vref Min. -- -100 -- -- Limits Typ. 1.8 -- 0.5 2.0 Max. 2.6 +100 2.0 3.5 Unit V A S S
MITSUBISHI
M54678FP
2-PHASE STEPPER MOTOR DRIVER
APPLICATION DIRECTIONS
(1) Ph input, En input determines output function. Ph* H L H L *: 1 or 2 Z : High impedance En* L L H H Out* H L Z Z Out*B L H Z Z (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.
VM
(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 2S 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 3S 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
ON Iout MA ON
OFF VCC MB
Ib = 10mA (Typ.) OFF
RS
Iout = IRS - Ib
*If Vcc, Tj and manufacturing dispersion are considered, dispersion of Ib will vary maximum 5mA (minimum = 5mA, maximum = 15mA)
MITSUBISHI
M54678FP
2-PHASE STEPPER MOTOR DRIVER
THERMAL DERATING
With infinite heat sink 5.0 Power Dissipation Pdp (W) 4.5 4.0 Without heat sink 3.0 Mounted on circuit board (*1)
2.0 1.2 1.0
0
25
50
75
100
125
150
Ambient Temperature Ta (C) (*1): Mounted on 100mm x 100mm, t = 1.6m (copper foil = 35m) circuit board
APPLICATION CIRCUIT
STEPPER MOTOR
M
1 2 3 4 Rrs1 5 6 Vm 7 8 9 10 11 12 13 14 Vcc input input 15 16 17 3.5V 18
P.GND Out1 Out1B Rs1 S1 Vm1
N.C Out2 Out2B Rs2 S2 Vm2
36 35 34 33 32 31 30 29 28 Rrs1, Rrs2 = 0.5 - 1.0 Cfref = 390pF Rrs2
An example of the setting
M54678FP
GND
GND
27 26 25
N.C Vcc Ph1 En1 Vref1 Regout
N.C N.C Ph2 En2 Vref2 Fref
24 23 22 21 20 19 Cfref input input

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