M54677FP Datasheet, PDF (1/5 Pages) Mitsubishi Electric Semiconductor – 2-PHASE STEPPER MOTOR DRIVER

MITSUBISHI <CONTROL / DRIVER IC>
M54677FP
2-PHASE STEPPER MOTOR DRIVER
DESCRIPTION
The M54677FP is a semiconductor IC to drive a bipolar stepper
motor directly by controlling the coil current with the constant
current method.
FEATURES
qWide output current control range (20 – 1000mA)
qBipolar and constant current
qBuilt in a thermal shutdown circuit
qBuilt in flywheel diodes
APPLICATION
Office automation equipment such as printer, FDD, HDD, and FAX
FUNCTION
The M54677FP can drive a stepper motor by the 2-phase bipolar
method and also control 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.
PIN CONFIGURATION (TOP VIEW)
St1 ¹
C1 ²
Vref1 ³
VM11 ⁴
MA1 ⁵
E1 ⁶
7
8
9
GND
10
11
12
N.C 13
MB1 ¹⁴
VM12 ¹⁵
Vcc1 16
T1 ¹⁷
Ph1 18
36 _St2
35 _C2
34 _Vref2
33 _VM21
32 _MA2
31 _E2
30
29
28
GND
27
26
25
24 N.C
23 _MB2
22 _VM22
21 _Vcc2
20 _T2
19 Ph2
Outline 36P2R-D
N.C: no connection
BLOCK DIAGRAM
36 34
19
33 32 23 22
13
18
4 5 14 15
21
current
-comp ^mono-multi
+
–
–^{25 30}
–
+
standby
-comp
35
20
Buffer
31
GND
C2
T2
E2
16
current
-comp ^mono-multi
+
–
– 7 12
–
+
standby
-comp
2
17
Buffer
6
GND
C1
T1
E1