M54646AP Datasheet, PDF (1/6 Pages) Mitsubishi Electric Semiconductor – 2-PHASE STEPPER MOTOR DRIVER

MITSUBISHI <CONTROL / DRIVER IC>
M54646AP
2-PHASE STEPPER MOTOR DRIVER
DESCRIPTION
The M54646AP is a semiconductor IC to drive bipolar stepper
motors by controlling winding current with reference to a
designated current level.
FEATURES
q Wide driver voltage range (10 – 40V)
q Wide output current control range (20 – 800mA)
q Bipolar and constant current control
q Built-in flywheel diode
q Built-in thermal protection circuit
APPLICATION
Office automation equipment such as printers, FDDs, HDDs and
facsimiles
FUNCTION
M54646AP Integrated Circuit drives two-phase bipolar stepper
motors while controlling winding current: It controls winding current
direction by inputting phases (pins 14 and 15) and, at the same
time, controls winding current amperage with terminals VR (pins
2 and 27 ).
Provided with control circuits that output two phases, this IC is
sufficient to drive a two-phase bipolar stepper motor.
PIN CONFIGURATION (TOP VIEW)
Comparator input (1) C1 → 1
Comparator reference
voltage input (1)
VR1 → 2
Output stage _VMM1
3
supply voltage (1)
Output terminal (1) MA1 ← 4
Current sensor (1) E1 ← 5
6
7
GND
8
9
Output terminal (1) MB1 ← 10
Output stage _{VMM1 11}
supply voltage ((1)
Power supply (1) VCC1 12
One-shot multi
time constant
Output current
direction switch
T1 →← 13
Ph1 ^→ 14
28 ← C2 Comparator input (2)
27 ← VR2 ^{Comparator reference}
voltage input (2)
26 VMM2 ^{Output stage}
supply voltage (2)
25 → MA2 Output terminal (2)
24 → E2 Current sensor (2)
23
22
GND
21
20
19 → MB2 Output terminal (2)
18 VMM2 ^{Output stage}
supply voltage (2)
17 _VCC2 Power supply (2)
16 →← T2
15 ← Ph2
One-shot multi
time constant
Output current
direction switch
Outline 28P4B
BLOCK DIAGRAM
VR2 Ph2
27 15
MA2
25
MB2
19
VMM2
18
VR1 Ph1
2 14
VMM1
3
MA1
4
MB1
10
Power
supply (1)
VCC1 ¹²
1
1
1
1
1
1
Power
supply (2)
17 _VCC2
1
1
1
1
TSD
tOFF = 0.69 • RT • CT
Current sensor
Mono-
stable
tOFF = 0.69 • RT • CT
Current sensor
Mono-
stable
20 21 22 23 28
C2
GND _Comparator
input (2)
16
T2
One-shot multi
time constant
24 6 7 8 9 1
E2
Current ^GND
sensor
C1
Comparator
input (1)
13
T1
One-shot multi
time constant (1)
5
E1
Current
sensor (1)