PBL3717A Просмотр технического описания (PDF) - System Logic Semiconductor

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производитель

PBL3717A

STEPPER MOTOR DRIVER

System Logic Semiconductor 

PBL3717A

Quarter Step Operation

It is preferable to realize the quarter step operation

at full power otherwise the steps will be of very ir-

regular size.

The extra quarter steps are added to the half steps

sequence by putting one coil on half current accord-

ing to the sequence. __

AB

→

A

2

B

→

B

→

A

2

B

→

AB

→

A

B

2

→

A

etc.

Motor Selection

As the PBL3717A provides constant current drive,

with a switching operation, care must be taken to se-

lect stepper motors with low hysteresis losses to

prevent motor over heat.

Figure 6 : Source Saturation Voltage versus

Output Current (recircuit period)

L -C Filter

To reduce EMI and chopping losses in the motor a

low pass L -C filter can be inserted across the out-

puts of the PBL3717A as shown on the following pic-

ture.

L

≈

1

10

LM

C ≈ 4 ⋅ 10−10

L

Figure 7 : Source Saturation Voltage versus

Output Current (conduction period)

Figure 8 : Sink Saturation Voltage versus

Output Current

Figure 9 : Comparator Threshold versus

Junction Temperature

8/11

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