MITSUBISHI
M54672SP
2-PHASE STEPPER MOTOR DRIVER
DESCRIPTION
The M54672SP is a semiconductor IC to drive a stepper motor directly by controlling the coil current with the constant current method.
PIN CONFIGURATION (TOP VIEW)
Standby input (1) Comparator input (1) Comparator reference input (1) St1 1 C1 2 VR1 3
32 St2 31 C2
Standby input (2) Comparator input (2)
Comparator reference 30 VR2 input (2) power 29 Vbs2 Bootstrap supply (2) Output power 28 VMM2 supply (2)
FEATURES
q Wide output current control range (20 – 1200mA) q Bipolar and constant current drive q Built in a thermal shutdown circuit q Built in flywheel diodes
Bootstrap power supply (1) Vbs1 4 Output power supply (1) VMM1 5 Output (1) MA1 6 Current sensor (1) E1 7
27 MA2 Output (2) 26 E2 25 24 23 22 MB2 Output (2) 21 VMM2 Output power supply (2) 20 Vbs2 supply (2)
Bootstrap power GND Current sensor (2)
M54672SP
8
APPLICATION
Office automation equipment such as printer, FDD, HDD and FAX
GND
9 10
Output (1)
MB1 11
FUNCTION
The M54672SP 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 with Ph input pins (pins 16 and 17) and the coil current value with VR pins (pins 3 and 30). 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.
Output power supply (1) VMM1 12 Bootstrap power supply (1) Vbs1 13 Power supply (1) Vcc1 14 One-shot-multi time constant (1) Output current direction switching (1) T1 15 Ph1 16
19 Vcc2 Power supply (2) 18 T2 17 Ph2
One-shot-multi time constant (2) Output current direction switching (2)
Outline 32P4B
BLOCK DIAGRAM
VR2 Comparator reference input(2) VR1 Comparator reference input(1)
Vbs2 Bootstrap power supply(2)
Vbs2 Bootstrap power supply(2)
Vbs1 Bootstrap power supply(1)
32
30
17
29
28
27
22
21
20
1
3
16
4
5
6
11
12
Vbs1 Bootstrap power supply(1) ...
M54672SP PDF File
