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REJ03F0052_M54679SP Schematic ( PDF Datasheet ) - Hitachi Semiconductor

Teilenummer REJ03F0052_M54679SP
Beschreibung 2-Phase Stepper Motor Driver
Hersteller Hitachi Semiconductor
Logo Hitachi Semiconductor Logo 




Gesamt 12 Seiten
REJ03F0052_M54679SP Datasheet, Funktion
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






REJ03F0052_M54679SP Datasheet, Funktion
M54679SP
(3) Equivalent circuit of Vref terminal.
The equivalent circuit of Vref terminal is shown in bellow circuit. As Vref terminal needs typical 500 µA 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 µs since the output power transistors go to ON.
(7) Ph signal delay circuit.
M54679SP has a delay time of 3.0 µs 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

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REJ03F0052_M54679SP pdf, datenblatt
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