M54678FP Datasheet, PDF (1/5 Pages) Mitsubishi Electric Semiconductor – 2-PHASE STEPPER MOTOR DRIVER

MITSUBISHI <CONTROL / DRIVER IC>
M54678FP
2-PHASE STEPPER MOTOR DRIVER
DESCRIPTION
The M54678FP is a semiconductor integrated circuit designed for
stepper motor driver used to printer, PPC and facsimile.
FEATURES
q Wide supply voltage range (10 – 35V)
q Output current is controlled by PWM operation
q Few external components (This IC can be operated with 1
capacitor and 2 resistances)
q Voltage stabilizer circuit (Regout = 3.5V)
q Thermal protection circuit
q Flywheel diode
APPLICATION
Printers, PPC, facsimile
FUNCTION
The M54678FP is a integrated circuit which can drive two phase
stepper motor. The output current direction is determined by phase
terminal function, and the output current level is controlled by Vref
terminals voltage.
PIN CONFIGURATION (TOP VIEW)
P.GND 1
Out1 2
Out1B 3
Rs1 4
S1 5
Vm 6
7
8
9
GND
10
11
12
N.C 13
VCC 14
Ph1 15
En1 16
Vref1 17
Regout 18
36 N.C
35 Out2
34 Out2B
33 Rs2
32 S2
31 Vm
30
29
28
GND
27
26
25
24 N.C
23 N.C
22 Ph2
21 En2
20 Vref2
19 Fref
Outline 36P2R-D
N.C: no connection
BLOCK DIAGRAM
Out1 _Out1B
Vm
Out2 Out2B
Ph1
Ph2
En1
En2
Delay
Source
PWM
Delay
Delay
Source
PWM
Delay
P.GND
Spike
current
cancel
Current
comp1
RQ
FF1
S
P.GND
QR
FF2
S
Frequency
Generator
VTM
Spike
current
cancel
Current
comp2
VTH
VTL
VCC
Regulator(3.5V)
1.25V
Regout
10K ^18K
Rs1
S1 Vref1
Fref
Vref2
S2 Rs2
GND