MITSUBISHI
M54676P
2-PHASE STEPPER MOTOR DRIVER
DESCRIPTION
The M54676P is a semiconductor IC to drive a bipolar stepper motor by the micro step method by changing the coil current of the motor continuously.
PIN CONFIGURATION (TOP VIEW)
OutA Out ∗A SG A Sense A GND GND Vref A Phase A Phase ∗A 1 2 3 4 5 6 7 8 9 20 VM 19 OutB 18 Out ∗B 17 SG B 16 GND 15 GND 14 Sense B 13 VrefB 12 PhaseB 11 Phase ∗B
FEATURES
q Highly-accurate micro step drive by chopping sink output transistor and source output transistor simultaneously q Bipolar and constant current drive q Built in a thermal shutdown circuit and standby circuits q Built in flywheel diodes
M54676P
APPLICATION
Office automation equipment such as printer and FAX
Vcc5 10
Outline 20P4
FUNCTION
The M54676P can drive a stepper motor by the 2-phase bipolar method and also controls the coil current. Furthermore, it controls the direction of the coil current by Ph input and the coil current value by Vref pin. Because two control circuits are built in this IC, a stepper motor can be driven with a single IC by the 2-phase bipolar method.
BLOCK DIAGRAM
OUT ∗A OUT A VrefB 13 Vcc5 10 20KΩ 6KΩ
Internal bias
VrefA 7
20
VM
1
2
Vref A Amp
+ -
Vref 2 comparator
+ -
9KΩ
0. 2V
+ -
1KΩ Current comparator
Vref B Amp
+ -
Vref 2 comparator
+ -
3
SGA
19 OUT B 18 OUT ∗B
9KΩ 1KΩ TSD
0. 2V Current comparator
+ -
4 14 SenseA SenseB
8 PhaseA
9 Phase ∗A
11 12 PhaseB Phase ∗B
16 15 6 GND
5
17 SGB
MITSUBISHI
M54676P
2-PHASE STEPPER MOTOR DRIVER
ABSOLUTE MAXIMUM RATINGS (Ta= 25˚C, unless otherwise noted)
Symbol VM Vcc5 Iout Vanalg Vlogic Pt Kθ Tj Ta Tstg Parameter Supply voltage 1 Supply voltage 2 Maximum output current Analog input voltage Logic input voltage Allowable loss Thermal derating Junction temperature Operating temperature Storage temperature Conditions Pin Pin
20 10
Pins 4 7 13 and 14 Pins 8 9 11 and 12 100mm x 100mm, t=1. 6mm Glass epoxy board (θ ja=50˚C/W ) dit...
M54676P PDF File
