PBL3717A_93 Просмотр технического описания (PDF) - STMicroelectronics

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производитель

PBL3717A_93

STEPPER MOTOR DRIVER

STMicroelectronics 

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 puttingone 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 takento 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 followingpic-

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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