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PDF M54679FP Data sheet ( Hoja de datos )

Número de pieza M54679FP
Descripción 2-PHASE STEPPER MOTOR DRIVER
Fabricantes Mitsubishi 
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No Preview Available ! M54679FP Hoja de datos, Descripción, Manual

PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
MITSUBISHI <CONTROL / DRIVER IC>
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.
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.
APPLICATION
Printer, PPC and Facsimile.
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.
BLOCK DIAGRAM
Ph1A
Out1B Vm1 Out1A
PIN CONFIGURATION (TOP VIEW)
N.C
P.GND
Out1A
Out1B
RS1
S1
Vm1
GND
VCC
Ph1A
Ph1B
Stby
Vref
I0(1)
I1(1)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
42 N.C
41 N.C
40 Out2A
39 Out2B
38 Rs2
37 S2
36 Vm2
35
34
33
32 GND
31
30
29
28
27 Ph2A
26 Ph2B
25 Fref
24 Regout
23 I0(2)
22 I1(2)
Outline 42P9R-A
N.C: no connection
Out2A Vm2 Out2B
Ph2A
Ph1B
Source
PWM
Source
PWM
Ph2B
Regout
(3.5V)
Vref
I0(1)
I1(1)
1.25V
18K 10K
P.GND
Spike
current
cancel
Current
comp1
RQ
FF1
S
P.GND
QR
FF2
S
Spike
current
cancel
Current
comp2
TSD
Standby
Rs1 S1
Stby
Frequency
Generator
VTM
P.GND Fref
VTH
VTL
GND
S2 RS2
VCC
I0(2)
I1(2)

1 page




M54679FP pdf
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
MITSUBISHI <CONTROL / DRIVER IC>
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 2µs since the output power transistors go to ON.
(7). Ph signal delay circuit.
M54679FP has a delay time of 3.0µs 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
MA
Iout
OFF
RS
OFF VCC
MB
ON
Ib = 15mA (Typ.)
Iout = IRS - Ib

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