STK6712BMK4 Sanyo Semicon Device, STK6712BMK4 Datasheet - Page 6

• Manufacturer Part Number: STK6712BMK4
• Description: (STK6711AMK4 - STK6714BMK4) 4-Phase Stepping Motor Driver Unipolar Self-Excitation Type(Io = 1.5A)
• Manufacturer: Sanyo Semicon Device

2. 1-2 phase excitation
Setting Output Current
The motor output current waveform is shown to the right.
Output current I
voltage of pin 9 (11).
The computation equation is indicated below.
Power down can be accomplished by reducing the synthetic
impedance by connecting a resistance in parallel to R
The motor output current variation range can be set for the
range of:
but when set to I
supply. If earth is poor, there may be no motor current when I
range of L = 1 mH to 10 mH.
Vref =
I
I
OH
OH
≈ K
= 0.2 A to 1.7 A
R
K: 1.1 to 1.2 (correction for actual measurement)
R
S
O
: Internal current detect resistance
OH
OH
1 + R
(0.33 ± 3%)
R
O
Vref
= 0.2 A or lower note that the HIC GND pattern will be one-point earth with respect to the power
2
can be set by the user by adjusting the
R
S
O
2
...............................................(4)
V
CC
2...............................(3)
STK6712BMK4 Excitation Circuit
STK6712BMK4
O
2.
OH
= 0.2 A. We recommend a motor inductance usage
Fig. 3 Output Motor Current Waveform
Fig. 4 Vref Peripheral Circuit
No. 4867-6/10