MITSUBISHI
M54671SP
2-PHASE STEPPER MOTOR DRIVER
DESCRIPTION
The M54671SP is a semiconductor IC to drive a bipolar stepper motor directly by controlling the coil current with the constant current method.
PIN CONFIGURATION (TOP VIEW)
Standby input(1) Comparator input(1) St1 1 C1 2
32 St2 31 C2 30 VR2
Standby input(2) Comparator input(2)
FEATURES
q Wide output current control range (20 – 1200mA) q Bipolar and constant current q Built in a thermal shutdown circuit
Comparator VR1 3 reference input(1) Bootstrap power Vbs1 4 supply(1) Output power VMM1 5 supply(1) Output(1) Current sensor(1) MA1 6 E1 7
Comparator reference input(2) Bootstrap power 29 Vbs2 supply(2) Output power 28 VMM2 supply(2)
27 MA2 26 E2 25 24 23 22 MB2
Output(2) Current sensor(2)
M54671SP
APPLICATION
Office automation equipment such as printer, FDD, HDD, and FAX
GND
8 9 10
GND
FUNCTION
The M54671SP 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 stepping motor can be driven with a single IC by the 2-phase bipolar method.
Output(1)
MB1 11
Output(2) Output power
Output power supply(1) VMM1 12 Bootstrap power Vbs1 13 supply(1) Power supply(1) Vcc1 14 One-shot-multi time constant(1) Output current direction switching(1) T1 15 Ph1 16
21 VMM2 supply(2) 20 Vbs2
Bootstrap power supply(2)
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)
Vbs1 Bootstrap power supply(1)
Vbs2 Bootstrap power supply(2)
VMM2 Output power supply(2)
32 VCC2 Power supply(2)
30
17
29
28
27
22
21
20
1
3
16
4
5
6
11
VMM1 Output power supply(1) 12
...
M54671SP PDF File
