STK672-630A-E Sanyo Semicon Device, STK672-630A-E Datasheet - Page 17

• Manufacturer Part Number: STK672-630A-E
• Description: 2-phase Stepping Motor Driver
• Manufacturer: Sanyo Semicon Device

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(2) I D and V DSS Operating Waveforms in Non-avalanche Mode
Note:
The operating conditions given above represent a loss when driving a 2-phase stepping motor with constant current
chopping.
Because it is possible to apply 2.6W or more at I OH =0A, be sure to avoid using the MOSFET body diode that is used
to drive the motor as a zener diode.
Although the waveforms during avalanche mode are given in Figure 1, sometimes an avalanche does not result during
actual operations.
Factors causing avalanche are listed below.
• Poor coupling of the motor’s phase coils (electromagnetic coupling of A phase and AB phase, B phase and
• Increase in the lead inductance of the harness caused by the circuit pattern of the P.C. board and motor.
• Increases in V DSS , tAVL, and IAVL in Figure 1 due to an increase in the supply voltage from 24V to 36V.
If the factors above are negligible, the waveforms shown in Figure 1 become waveforms without avalanche as
shown in Figure 2.
Under operations shown in Figure 2, avalanche does not occur and there is no need to consider the allowable loss
range of PAVL shown in Figure 3.
BB phase).
Figure 3 Allowable Loss Range, PAVL-I OH During STK672-630A-E Avalanche Operations
Figure 2 Output Current, I D , and Voltage, V DS , Waveforms 2 of the STK672-6** Series when Driving a
V DS
I D
2-Phase Stepping Motor with Constant Current Chopping
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
0.5
STK672-630A-E
Motor phase current, I OH - A
PAVL - I O H
1.0
1.5
2.0
ITF02558
ITF02573
2.5
I OH : Motor current peak value
No. A1129-17/21
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