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M54679SP
2-Phase Stepper Motor Driver
REJ03F0052-0100Z Rev.1.0 Sep.17.2003
Description
The M54679SP is a semiconductor integrated circuit that can drive the bipolar stepping motor 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
Out1B Vm1 Out1A Ph1A Out2A Vm2 Out2B Ph2A
Ph1B
Source PWM
Source PWM
Ph2B
P.GND
P.GND
Vcc
Regout (3.5V)
18K
1.25V
Spike current cancel Current comp1
R S
Q FF1
Q
R FF2 S
Spike current cancel Current comp2
10K
Vref I0(1) I1(1) TSD Standby
Frequency Generator VTM VTH VTL
I0(2) I1(2)
Rs1
S1
Stby
P.GND
Fref
GND
S2
Rs2
Rev.1.0, Sep.17.2003, page 1 of 11
M54679SP
Pin Configuration (Top View)
I1(2) I0(2) Regout Fref Ph2B Ph2A NC GND Vm2 S2 Rs2 Out2B Out2A N.C 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 Vm1 S1 Rs1 Out1B Out1A P.GND GND I1(1) I0(1) Vref Stby Ph1B Ph1A Vcc
32 Shrink-DIP (32P4B)
Pin Functions
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 driver. 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%, 31%, 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 (Vout = 3.5 V). A capacitor due to PWM carrier frequency. The GND terminal of bottom side flywheel diodes.
Rev.1.0, Sep.17.2003, page 2 of 11
M54679SP
Absolute Maximum Ratings
(Ta = 25C unless otherwise noted)
Symbol Vm Iout VCC Vlogic Vanalog VRs Pd Tj Topr Tstg Parameter Motor supply voltage Output current Power supply Logic input voltage Analog input voltage Output current sensing Power dissipation Junction temperature Operating temperature Storage temperature Per one phase Ph1A, Ph1B, Ph2A, Ph2B, I0, I1, stby Vref S1, S2 Rs1, Rs2 Conditions Rating -0.3 to 37 0.8 -0.3 to 7.0 -0.3 to Vcc -0.3 to Vcc 1.5 1.7 150 -20 to 75 -40 to 125 Unit V A V V V V W C C C
Thermal Derating Curve
j-c = 25C/W
Power Dissipation Pd (W)
3
2.5W
(
With a heat dissipation board Al board 10 cm2 c-a = 25C/W
)
2
1.7W
1
Simple substance (c-a = 48.5C/W)
0
10
20
30
40
50
60
70
80
Ambient Temperature Ta (C)
Recommended Operating Conditions
Limits 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 -- Typ. 5.0 -- -- -- -- -- -- 160 Max. 5.5 35 800 2.0 2.0 50 50 -- Unit V V mA s s s s C
Rev.1.0, Sep.17.2003, page 3 of 11
M54679SP
Electrical Characteristics
(Ta = 25C, Vcc = 5 V, VM = 24 V unless otherwise noted.) Control circuit
Symbol ICC1 ICC2 ICC3 Im12 VlogicH VlogicH 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 Supply current Conditions Stby = H, Ph*A = H, Ph*B = L (Bridge ON) Stby = H, Ph*A = Ph*B (Bridge OFF) Stby = L (Standby condition) Stby = L Note Vin = 5 V Vin = 0 V Vin = 5 V Vin = 0 V Vin = 5 V Vin = 0 V S1 or S2 terminals input current (S = 0 V, Vref = 5 V). S1 or S2 terminals input voltage sphere Input current of Vref (Vref = 5 V, I0 = I1 = 0 V) C = 390 pF, Fref terminal oscillation Iout = -0.1 mA to +1 mA I0 = L, I1 = L, Vref = 5 V (Vref/10*100%) I0 = H, I1 = L, Vref = 5 V (Vref/10*70%) I0 = L, I1 = H, Vref = 5 V (Vref/10*31%) Limits Min 39 20 1.5 -10 2.4 0 -- -20 -- -400 -- -400 -20 0 -- 0 20 3.35 475 325 139 Typ 56 27 4.0 0 -- -- -- -3.0 -- -300 -- -300 -3.0 -- 500 -- 30 3.50 500 350 155 Max 73 40 6.5 100 Vcc 0.6 10 -- 10 -- 10 -- -- VCH(H) 650 Vcc 40 3.65 525 375 171 mA Unit
Motor supply current (standby) Logic input voltage (Ph, I1, I0, Stby terminals) Phase terminal input current I0, I1 terminal 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
A V A A A A V A V kHz V mV mV 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.
Rev.1.0, Sep.17.2003, page 4 of 11
M54679SP Output circuit (Ta = 25C, Vcc = 5 V, VM = 24 V unless otherwise noted.)
Symbol Vsat Ileak VF(H) VF(L) tdon tdoff tdstby tdph 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 OFF delay of standby Phase delay Conditions Top and Bottom at load current 0.6 A If = 0.6A If = 0.6A Time until output become ON since Fref = 2.5 V 0.5 V Time until output become OFF since Vref < S Time until output become ON since Stby = L H Time until output become ON since Phase = L H Limits Min -- -100 -- -- -- -- -- -- Typ 1.6 -- 1.7 1.1 0.5 2.0 3.0 3.0 Max 2.2 +100 2.3 1.5 2.0 3.5 10.0 10.0 V A V V S S S S Unit
Function Explanation
(1) Ph inputs make a decision the output function. (Ph input of phase 4)
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 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 L H L H I1 L L H H Output current ratio 100% 70% 31% 0% Current sensing comparators threshold voltage (Vref = 5 V) 500 mV 350 mV 155 mV --
Rev.1.0, Sep.17.2003, page 5 of 11
M54679SP (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 value when Vref voltage is set.
Vref 18K 3.5K 0.68K 2K I0 I1
(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 (390 pF typ) is charged and discharged by the constant current and a triangular waveform (VTH (Fref terminal high voltage) = 2.5 V, VTL (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 RS (current sensing) in a short time and this is caused by the internal delay time. M54679SP 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 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. 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).
Rev.1.0, Sep.17.2003, page 6 of 11
M54679SP (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 current when the output current is set.
VM
ON Iout MA ON
OFF VCC MB
Ib=15mA(Typ.) OFF
RS
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.
Rev.1.0, Sep.17.2003, page 7 of 11
M54679SP (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 driven becomes a corrupted-curved waveform when the current changes due to the inductance of the motor.
Torque vector
<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)
AB
B
AB
(2)
(3)
(4)
100%
(2) L L 100% 100% 100% 100% A A B B AB B
(1) A
0%
(3) (4)
BA
<8 steps function>
[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) A A B B AB B BA
100% 70%
AB
B
AB
[2] [3] [1] [8] [5] [6] [7] A
0%
A
[4]
<16 steps function>
1
Ph1A Ph1B Ph2A Ph2B I0(1) I1(1) I0(2) I1(2) A A B B AB B BA
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16
100% 70%
AB
B
AB
432 5 1 16 15 14 9 10 11 12 13
A
31% 0%
A
6 7 8
Output current 1 (Current of Phase 1) Output current 2 (Current of Phase 2)
Rev.1.0, Sep.17.2003, page 8 of 11
M54679SP (13) Input terminal
Symbol Stby Equivalent circuit of the circumstance of input terminals
VCC
Remarks
I0(1) I1(1) I0(2) I1(2) Ph1A Ph1B Ph2A Ph2B
1K
VCC
1K
S1 S2
VCC
S
VCH
Vref
Vref
VCC
I0(1)
I0(2)
I1(1)
I1(2)
Fref
VCC
Fref
Rev.1.0, Sep.17.2003, page 9 of 11
M54679SP
Application Circuit
input input
1 2 3
I1(2) I0(2) Regout Fref Ph2B Ph2A NC GND Vm2 S2 Rs2 Out2B Out2A N.C
I1(1) I0(1) Vref Stby Ph1B Ph1A Vcc
32 31 30 29 28 27 26 25
input input
390pF
input input
4 5 6 7 8 9 10 11
input input input Vcc
GND Vm1 S1 Rs1 Out1B Out1A P.GND
24 23 22 21 20 19 18 17 Rrs1 Vm
Rrs2
12 13 14 15 16
0.5 to 1.0
0.5 to 1.0
M Stepper Motor
Rev.1.0, Sep.17.2003, page 10 of 11
M54679SP
32P4B
JEDEC Code -- Weight(g) 2.2 Lead Material Alloy 42/Cu Alloy
MMP
Plastic 32pin 400mil SDIP
EIAJ Package Code SDIP32-P-400-1.78
c
Package Dimensions
E
1
16
D
Symbol
A
L
e
b1
b
b2
SEATING PLANE
A1
A2
A A1 A2 b b1 b2 c D E e e1 L
Dimension in Millimeters Min Nom Max -- -- 5.08 0.51 -- -- -- 3.8 -- 0.35 0.45 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
e1
Rev.1.0, Sep.17.2003, page 11 of 11
17
32
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