3-5
3.3.2 Sample Drive Circuit
(a) Motor current control with VREF signal
Figure 3-3 is a sample drive circuit when motor driver VREF signal (1.0V output) and resistance
voltage division are used to perform the motor current control. It is not possible to use this sample
circuit when auto-loading is used because the motor current switching control is required.
Drive Condition
Motor Controlled Current
(Fixed)
VLIM Terminal Input
Voltage
Paper feeding/Printing
325 mA
161 mV to 167 mV
Printer Connecting
Term inals
PH1
PH2
PH3
PH4
M CL1
BD6380EFV
IN1A
OUT1A
IN2A
OUT2A
IN1B
OUT1B
IN2B
OUT2B
PS
VREF
RNF1
SENSE1
VLIM 1
VLIM 2
RNF2
SENSE2
CR1
CR2
NC
NC
14
10
+
47μF
25V
Vp
4
18
2
47kΩ
FUSE
1A
15
11
19
7
6
24
1
Vd d
16
9
23
3
5
20
12
0.5 Ω 1%
0.125W
21
13
0.5 Ω 1%
0.125W
18kΩ
18kΩ
680p F
680p F
22
27
29
28
30
A
B
/A
/B
0.1 μF
8
17
13.0kΩ
±
1%
2.55kΩ
±
1%
0.1 μF
Vdd
GND
VM 1
VM 2
* : Recommended motor driver : BD6380EFV(Rohm)
Figure 3-3 Sample Drive Circuit 1