STK672-340-E 查看數據表（PDF） - SANYO -> Panasonic
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STK672-340-E
SANYO -> Panasonic
STK672-340-E Datasheet PDF : 13 Pages
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STK672-340-E
[ID and VDSS Operating Waveforms in Non-avalanche Mode]
Although the waveforms during avalanche mode are given in Figure 7, 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
BB phase).
• Increase in the lead inductance of the harness caused by the circuit pattern of the P.C. board and motor.
• Increases in VDSS, tAVL, and IAVL in Figure 7 due to an increase in the supply voltage from 24V to 36V.
If the factors above are negligible, the waveforms shown in Figure 7 become waveforms without avalanche as
shown in Figure 8.
Under operations shown in Figure 8, avalanche does not occur and there is no need to consider the allowable
loss range of PAVL shown in Figure 9.
VDS
IOH: Motor current peak value
ID
ITF02558
Figure 8 Output Current, ID, and Voltage, VDS, Waveforms 2 of the STK672-3** Series when Driving
a 2-Phase Stepping Motor with Constant Current Chopping
Figure 9 Allowable Loss Range, PAVL-IOH During STK672-340-E Avalanche Operations
PAVL - IOH
5.0
4.5
4.0
3.5
3.0
Tc=80°C
2.5
2.0
105°C
1.5
1.0
0.5
0
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Motor phase current, IOH - A
ITF02653
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 3.0W or more at IOH=0A, be sure to avoid using the MOSFET body diode that is used to
drive the motor as a zener diode.
[Smoke Emission Precuations]
If any of the output pins 2, 3, 4, and 5 is held open, the electrical stress onto the driver due to the inductive energy
accumulated in the motor could cause short-circuit followed by permanent damage to the internal MOSFET.
As a result, the STK672-340-E may give rise to emit smoke.
No.A1254-9/13
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