STK672-732A-E View Datasheet(PDF) - ON Semiconductor

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STK672-732A-E

Thick-Film Hybrid IC 2-phase Stepping Motor Driver

ON Semiconductor 

STK672-732A-E

(2) ID and VDSS Operating Waveforms in Non-avalanche Mode

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

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 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.

VDS

IOH: Motor current peak value

ID

ITF02558

Figure 2 Output Current, ID, and Voltage, VDS, Waveforms 2 of the STK672-7** Series when Driving a

2-Phase Stepping Motor with Constant Current Chopping

Figure 3 Allowable Loss Range, PAVL-IOH During Avalanche Operations

PAVL - IOH

4.0

3.5

Tc=80°C

3.0

2.5

105°C

2.0

1.5

1.0

0.5

0

0

0.5

1.0

1.5

2.0

2.5

Motor phase current, IOH - A

ITF02573

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 IOH=0A, be sure to avoid using the MOSFET body diode that is used

to drive the motor as a zener diode.

No. A1590-15/19

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