M54646AP
2-Phase Stepper Motor Driver
REJ03F0044-0100Z
Rev.1.0
Sep.19.2003
Description
The M54646AP is a semiconductor IC to drive bipolar stepper motors by controlling winding current with reference to
a designated current level.
Features
•
•
•
•
•
Wide driver voltage range (10 – 40V)
Wide output current control range (20 – 800mA)
Bipolar and constant current control
Built-in flywheel diode
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 V
R
(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
Comparator input (1)
C
1
→
Comparator reference
V
R1
→
voltage input (1)
Output stage
V
MM
1
supply voltage (1)
Output terminal (1) M
A1
←
Current sensor (1)
1
2
3
4
28
←
C
2
27
←
V
R2
Comparator input (2)
Comparator reference
voltage input (2)
26
V
MM
2 Output stage
supply voltage (2)
25
→
M
A2
Output terminal (2)
24
→
E
2
23
22
GND
21
20
19
→
M
B2
Output terminal (2)
18
V
MM
2 Output stage
supply voltage (2)
17
V
CC2
Power supply (2)
One-shot multi
16
→
T
2
←
time constant
15
←
Ph2 Output current
direction switch
Current sensor (2)
E
1
←
5
6
7
GND
8
9
M54646AP
Output terminal (1)
M
B1
←
10
11
12
13
14
Output stage V
MM
1
supply voltage (1)
Power supply (1) V
CC1
One-shot multi
←
T
1
→
time constant
Output current
Ph1
→
direction switch
Outline 28P4B
Rev.1.0, Sep.19.2003, page 1 of 8
RENESAS [ RENESAS TECHNOLOGY CORP ]
