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PDF M54679SP Data sheet ( Hoja de datos )
| Número de pieza | M54679SP | |
| Descripción | 2-Phase Stepper Motor Driver | |
| Fabricantes | Hitachi | |
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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
Ph1A
Out1B Vm1 Out1A
Out2A Vm2 Out2B
Ph2A
Ph1B
Source
PWM
Source
PWM
Ph2B
Regout
(3.5V)
Vref
I0(1)
I1(1)
1.25V
18K 10K
P.GND
Current
comp1
Spike
current
cancel
RQ
FF1
S
P.GND
QR
FF2
S
Spike
current
cancel
Current
comp2
TSD
Standby
Frequency
Generator
VTM
VTH
VTL
Rs1 S1 Stby
P.GND Fref
GND S2 Rs2
Vcc
I0(2)
I1(2)
Rev.1.0, Sep.17.2003, page 1 of 11
1 page  
M54679SP
Output circuit
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
(Ta = 25°C, Vcc = 5 V, VM = 24 V unless otherwise noted.)
Conditions
Limits
Unit
Min Typ Max
Top and Bottom at load current 0.6 A
— 1.6 2.2 V
–100 —
+100 µA
If = 0.6A
— 1.7 2.3 V
If = 0.6A
— 1.1 1.5 V
Time until output become ON since
Fref = 2.5 V → 0.5 V
— 0.5 2.0 µS
Time until output become OFF since
Vref < S
— 2.0 3.5 µS
Time until output become ON since
Stby = L → H
— 3.0 10.0 µS
Time until output become ON since
Phase = L → H
— 3.0 10.0 µS
Function Explanation
(1) Ph inputs make a decision the output function. (Ph input of phase 4)
Ph*A
Ph*B
Out*A
Out*B
L
L
OFF
OFF
HL
HL
L HL H
H
H
OFF
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 I1 Output current ratio
L L 100%
H L 70%
L H 31%
H H 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
5 Page 
M54679SP
Package Dimensions
Rev.1.0, Sep.17.2003, page 11 of 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet M54679SP.PDF ] | |
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