STK673-010-E データシートの表示（PDF） - ON Semiconductor
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STK673-010-E Datasheet PDF : 15 Pages
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STK673-010-E
Set Equation of Output Current IO Peak Value
where
IO peak = Vref ÷ K K = 0.63 (V/A)
Vref ≤ 0.5 × VCC2
Vref = VCC2 × Rox ÷ (R01 + Rox)
Rox = (R02 × 4.0kΩ) ÷ (R02 + 4.0kΩ)
• R02 is preferably set to be 100Ω in order to minimize the effect of the internal impedance (4.0kΩ ±30%) of
STK673-010-E
• For noise reduction in 5V system, put the GND side of bypass capacitor (220μF) of VCC1 (shown in a thick line in
the above Sample Application Circuit) in the vicinity of pins 27 and 28 of the hybrid IC.
• Set the capacitance value of the bypass capacitor C1 such that a ripple current of a capacitance, which varies in
accordance with the increase of motor current, lies in an allowable range.
• K in the above-mentioned set equation varies within ±5 to ±10% depending on the inductance L and resistance value
R of the used motor. Check the peak value setting of IO upon actual setting.
Input/Output Terminals Functions of 5V System
Terminal name
Clock
Mode A
Mode B
Mode C
TU
Hold
CW/CCW
Enable
Reset
MOI
Vref
No.
Function
Basic clock for switching phase current of motor
Input frequency range: DC to 50kHz
11
Minimum pulse width: 10μs
High level duty: 40 to 60%
12
Sets excitation mode
13
Sets excitation mode
18
Sets excitation mode
Sets excitation mode
22
Switches 2-3 phase excitation of step current to rectangular current
More effective in increasing torque than in lowering vibration of motor
14
Temporarily holds the motor in a state
15
Switches the rotational direction of the motor
16
Turns OFF all of the driving MOSFET
17
System reset Make sure to input a reset signal of 10μs or more
20
Monitors the number of revolution of the motor
10
Sets the peak value of the motor current set at 0.63V per 1A
Conditions upon Functioning
0 = Low, 1 = High
Rising edge in Mode C = 1
Rising and falling edge in Mode C = 0
See table listed below
See table listed below
See table listed below
See table listed below
0
1 = CW, 0 = CCW
0
0
Outputs 1 pulse of a high level signal per
one cycle of phase current
Maximum value 0.5 × VCC2 (4A max)
Excitation Mode Table
Input condition
Mode A Mode B Mode C
TU
0
0
1
1
0
1
1
1
0
1
1
0
1
0
1
1
1
1
1
1
0
0
0
1
0
0
0
0
0
1
0
1
1
0
0
1
Excitation No.
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
Excitation Mode
2-phase
2-3-phase
2-3-phase TU
W2-3-phase
2W2-3-phase
2-3-phase
2-3-phase TU
W2-3-phase
2W2-3-phase
Number of current
steps
1
3
1
6
12
3
1
6
12
Number of clock pulse
per one cycle of
phase current
6
12
12
24
48
6
6
12
24
As shown in the table, TU terminal is only effective for Excitation Nos. (3) and (7).
Although the present hybrid IC is not damaged even when TU = 0 is mistakenly input in Excitation, other than
Excitation Nos. (3) and (7), motor vibration or motor current may increase.
* Timing charts for 3-phase stepping motor driver is illustrated on pages 9 to 13 for exemplary operations of Enable
Hold, CW/CCW for Excitation Nos. (1), (2), (3), (4), (5) and (9), and Excitation No. (4).
No.5708-5/15
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