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MITSUBISHI
PRELIMINARY
Notice: This is not a final specification. Some parametric limits are subject to change.
M54679FP
2-PHASE STEPPER MOTOR DRIVER
DESCRIPTION
The M54679FP is a semiconductor integrated circuit designed for stepper motor driver used to Printer, PPC and Facsimile.
PIN CONFIGURATION (TOP VIEW)
N.C 1 2 3 4 5 6 7 8 9 42 41 40 39 38 37 36 35 34 N.C N.C Out2A Out2B Rs2 S2 Vm2
FEATURES
q Wide supply voltage sphere (10 - 35V). q Bipolar, constant current PWM function. (Top side transistors PWM function, maximum current is 0.8 Amps). q Few external components. (This IC can be operated with 1 capacitor and 2 resistances). q 4 phases input style (include the protection function of output through current). q Output current change function (2 bits, 4 type currents). q Thermal protection circuit. q Include flywheel diodes.
P.GND Out1A Out1B RS1 S1 Vm1
M54679FP
10
33 32 31 30 29 28 27 26 25 24 23 22 Ph2A Ph2B Fref Regout I0(2) I1(2) GND
APPLICATION
Printer, PPC and Facsimile.
GND
11 12
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.
13 14 VCC Ph1A Ph1B Stby Vref I0(1) I1(1) 15 16 17 18 19 20 21
Outline 42P9R-A
N.C: no connection
BLOCK DIAGRAM
Ph1A
Out1B
Vm1
Out1A
Out2A
Vm2
Out2B Ph2A
Ph1B
Source PWM Logic Logic Logic
Source PWM Logic
Ph2B
P.GND Regout (3.5V) 1.25V Current comp1
P.GND
VCC
Spike current cancel
RQ FF1 S
QR FF2 S
Spike current cancel
18K Vref
10K
Current comp2
I0(1) I1(1)
TSD Standby
Frequency Generator
VTH VTL
I0(2) I1(2)
VTM
Rs1
S1
Stby
P.GND
Fref
GND
S2
RS2
MITSUBISHI
PRELIMINARY
Notice: This is not a final specification. Some parametric limits are subject to change.
M54679FP
2-PHASE STEPPER MOTOR DRIVER
PIN FUNCTION
Symbol Vm1, Vm2 Out1A, Out1B, Out2A, Out2B Rs1, Rs2 VCC Ph1A, Ph1B, Ph2A, Ph2B I0(1), I1(1), I0(2), I1(2) Stby S1, S2 Vref Regout Fref P.GND Terminal Motor Supply Voltage Output terminals Current sensor Power supply Phase input Output current change Standby input Sense inputs Vref input Output of voltage stabilizer A capacitor for oscillator Power GND Function Power supply for motor drive. Motor drive output terminals. Output current sensing resistor (Rs) connection terminals. Control circuit power supply. Output current direction switch terminals. Output current change (100%, 70%, 33%, 0%) terminals. Standby input (L: Standby, H or open: motor function) terminal. Input voltage terminal of comparators. Reference voltage due to setting output current. Output of voltage stabilizer (3.5V). A capacitor due to PWM carrier frequency. The GND terminal of bottom side flywheel diodes.
ABSOLUTE MAXIMUM RATINGS (Ta = 25C unless otherwise noted.)
Symbol Vm Iout VCC Vlogic Vanalog VRs Pd K Tj Topr Tstg Parameter Motor supply voltage Output current Power supply Logic input voltage Analog input voltage Output current sensing Power dissipation Thermal derating Junction temperature Operating temperature Storage temperature Conditions Ratings -0.3 - 37 0.8 -0.3 - 7.0 -0.3 - VCC -0.3 - VCC 1.5 2.7 46 150 -20 - 75 -40 - 125 Units V A V V V V W C/W C C C
Per one phase Ph1A, Ph1B, Ph2A, Ph2B, I0, I1, Stby Vref, S1, S2 Rs1, Rs2 Under board mount condition. (see next page)
MITSUBISHI
PRELIMINARY
Notice: This is not a final specification. Some parametric limits are subject to change.
M54679FP
2-PHASE STEPPER MOTOR DRIVER
FUNCTIONAL CONDITIONS
Symbol VCC Vm Iout tPLH tPHL Ton Toff TSDon Parameter Power supply Motor supply voltage Output current Rising time of logic inputs Falling time of logic inputs PWM ON time PWM OFF time Thermal shut down Min. 4.5 10 50 -- -- 5.0 5.0 -- Limits Typ. 5.0 -- -- -- -- -- -- 160 Max. 5.5 35 800 2.0 2.0 50 50 -- Units V V mA s s s s C
ELECTRICAL CHARACTERISTICS (Ta = 25deg, VCC = 5.0V, VM = 24V unless otherwise noted.) CONTROL CIRCUIT
Symbol ICC1 ICC2 ICC3 Vlogic H Vlogic L I(Ph) H I(Ph) L I(I0, I1) H I(I0, I1) L I(Stby) H I(Stby) L I(S) V(S) I(Vref) V(Vref) FC Vreg VCH(H) VCH(M) VCH(L) Parameter Conditions Stby = H, Ph*A = H, Ph*B = L (Bridge ON) Stby = H, Ph*A = Ph*B (Bridge OFF) Stby = L (Standby condition) Min. 39 20 2.0 2.4 0 -- -20 -- -400 -- -400 -20 0 -- 0 20 3.35 475 325 139 Limits Typ. 56 27 4.0 -- -- -- -3.0 -- -300 -- -300 -3.0 -- 500 -- 30 3.50 500 350 155 Max. 73 40 6.0 VCC 0.6 10 -- 10 -- 10 5.0 -- VCH(H) 650 VCC 40 3.65 525 375 171 Units
Supply current Logic input voltage (Ph, I1, I0, Stby terminals) Phase terminal input current I0, I1 terminals input current Standby terminal input current Current sensing Comparators input current Current sensing Comparators input voltage sphere Vref input current Vref input voltage sphere Oscillation frequency of Fref Voltage stabilizer output Current sensing Comparators threshold voltage
mA
V A A A A V A V kHz V mV mV mV
Vin = 5V Vin = 0V Vin = 5V Vin = 0V Vin = 5V Vin = 0V S1 or S2 terminals input current (S1 or S2 = 0V, Vref = 5V). S1 or S2 terminal input voltage sphere Input current of Vref (Vref = 5V, I0 = I1 = 0V) C = 390pF, Fref terminal oscillation Iout = -0.1mA - +1mA I0 = L, I1 = L, Vref = 5V (Vref/10*100%) I0 = H, I1 = L, Vref = 5V (Vref/10*70%) I0 = L, I1 = H, Vref = 5V (Vref/10*33%)
MITSUBISHI
PRELIMINARY
Notice: This is not a final specification. Some parametric limits are subject to change.
M54679FP
2-PHASE STEPPER MOTOR DRIVER
OUTPUT CIRCUIT (Ta = 25deg, VCC = 5.0V, VM = 24V unless otherwise noted.)
Symbol Vsat Ileak VF(H) VF(L) tdon tdoff Parameter Output saturation voltage Output leakage current VF of flywheel diode (Top) VF of flywheel diode (Bottom) Turn ON delay of output Turn OFF delay of output Conditions Top and Bottom at Load current 0.6A. If = 0.6A If = 0.6A Time until output become ON since S > Vref Time until output become OFF since S < Vref Min. -- -100 -- -- -- -- Limits Typ. 1.6 -- 1.7 1.1 0.5 2.0 Max. 2.2 +100 2.3 1.5 2.0 3.5 Units V A V V S S
FUNCTION EXPLANATION
(1). Ph inputs make a decision the output function. Ph*A L H L H Ph*B L L H H Out*A OFF H L OFF Out*B OFF L H 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. Current sensing comparators threshold voltage (Vref=5V) 500mV 350mV 155mV --
I0 L H L H
I1 L L H H
Output current ratio 100% 70% 30% 0%
(3). Equivalent circuit of Vref terminal. The equivalent circuit of Vref terminal is shown in right circuit. As Vref terminal needs typical 500A 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 (VCH) of this comparators, then if VRS > VCH, the comparators output change and shut off the output.
(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.
Vref 18k 3.5k 0.68k 2.5V 2k I0 I1 0.5V
MITSUBISHI
PRELIMINARY
Notice: This is not a final specification. Some parametric limits are subject to change.
M54679FP
2-PHASE STEPPER MOTOR DRIVER
(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 2s since the output power transistors go to ON. (7). Ph signal delay circuit. M54679FP has a delay time of 3.0s 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. (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.
VM
ON Iout MA ON OFF OFF
VCC
MB
Ib = 15mA (Typ.)
RS
Iout = IRS - Ib
MITSUBISHI
PRELIMINARY
Notice: This is not a final specification. Some parametric limits are subject to change.
M54679FP
2-PHASE STEPPER MOTOR DRIVER
(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.
<4 steps function>
(1) 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) (2) (3) (4) 100% AB
Torque vector B AB
(2) L L 0% 100% 100% 100% 100% A A B B AB B (3)
(1)
A
(4)
BA
<8 steps function>
B
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)
AB 100% 70%
2 3 1 8 5 7 6
AB
A A B B
0%
4
A
A
AB B
BA
<16 steps function>
1 Ph1A Ph1B Ph2A Ph2B I0(1) I1(1) I0(2) I1(2) A A B AB B B 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 AB 100% 70% 5 31% 0% A 7 8 9 10 11 12 13 6 4 3 2 1 16 15 14 B AB
A
Output current 1 (Current of Phase 1) Output current 2 (Current of Phase 2)
BA
MITSUBISHI
PRELIMINARY
Notice: This is not a final specification. Some parametric limits are subject to change.
M54679FP
2-PHASE STEPPER MOTOR DRIVER
(13). Inputs terminals. Symbol Equivalent circuit of the circumstance of input terminals. Remarks
VCC
18 20 21 23 22
pin: Stby pin: I0(1) pin: I1(1) pin: I0(2) pin: I1(2)
1K
VCC
16 17 27 26
pin: Ph1A pin: Ph1B pin: Ph2A pin: Ph2B
1K
VCC
6 37
pin: S1 pin: S2
VCC
19
pin: Vref
I0(1)
I0(2)
I1(1)
I1(2)
MITSUBISHI
PRELIMINARY
Notice: This is not a final specification. Some parametric limits are subject to change.
M54679FP
2-PHASE STEPPER MOTOR DRIVER
Symbol
Equivalent circuit of the circumstance of input terminals.
Remarks
VCC
Fref
Fref
THERMAL DERATING
6.0 (watts) 5.0 Power Dissipation (Pdp)
4.0 Using J-type board 2.7 watts 3.0
2.0
1.0
0
25
50
75 Ambient Temperature
100
125
150 (C)
MITSUBISHI
PRELIMINARY
Notice: This is not a final specification. Some parametric limits are subject to change.
M54679FP
2-PHASE STEPPER MOTOR DRIVER
APPLICATION CIRCUIT
STEPPER MOTOR
M
1 2 3 0.5 - 1.0 4 5 Rrs1 6 7 Vm 8 9
N.C P.GND Out1A Out1B Rs1 S1 Vm1
N.C N.C Out2A Out2B Rs2 S2 Vm2
42 41 40 39 38 37 36 35 34 33 Rrs2 0.5 - 1.0
M54679FP
10 11 12 13 14 15 VCC input input input 16 17 18 19 input input 20 21 VCC Ph1A Ph1B Stby Vref I0(1) I1(1) GND
GND
32 31 30 29 28
Ph2A Ph2B Fref Regout I0(2) I1(2)
27 26 25 24 23 22
input input
390pF input input

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