MITSUBISHI
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.
PIN CONFIGURATION (TOP VIEW)
P. GND Out1 Out1B Rs1 S1 Vm 1 2 3 4 5 6 7 36 35 34 33 32 31 30 29 28 GND 27 26 25 24 23 22 21 20 19 N. C N. C Ph2 En2 Vref2 Fref N. C Out2 Out2B Rs2 S2 Vm
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
8 9 GND 10 11 12 N. C VCC Ph1 En1 Vref1 Regout 13 14 15 16 17 18
M54678FP
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.
Outline 36P2R-D
N. C: no connection
BLOCK DIAGRAM
Out1 Out1B Vm Out2 Out2B
Ph1 En1
Ph2 En2
Delay
Source PWM
Delay
Delay
Source PWM
Delay
Logic
Logic
Logic
Logic
P. GND
P. GND
VCC
Spike current cancel
Current comp1
R Q FF1 S
Q R FF2 S
Spike current cancel
Regulator(3. 5V) Current comp2 VTH VTL 1. 25V Regout
Frequency Generator
10K
18K
VTM
Rs1
S1
Vref1
Fref
Vref2
S2
Rs2
GND
MITSUBISHI
M54678FP
2-PHASE STEPPER MOTOR DRIVER
PIN FUNCTION
Symbol Vm Out1, Out1B, Out2, Out2B Rs1,Rs2 VCC Ph1, Ph2 En1, En2 S1, S2 Vref1, Vref2 Regout Terminal Output stage supply voltage Output terminal Current sensor Power supply Phase input Enable input Sense input Vref input Voltage stabilizer output Functions Power supply for motor working Motor drive output terminal Output current sensing resistor (Rs) connect terminal Control circuit power supply Output current direction switch “L” input → Motor on “H” input → Enable Comparator input voltage termina...
M54678FP PDF File
