L298 for step motor

[banh]

Hi,
I wanna use L298 for step motor. how to estimate the values of sense resistors? what is usually the value range?

 

[Sebi]

This value depend from desired (enabled) current. As the datasheet show, the sensing voltage is 2V, so for 2A 1ohm.

 

[JFDuval]

Hi!

If you understand french, go to machivi.ma.cx

 

[banh]

This value depend from desied (enabled) current. As the datasheet show, the sensing voltage is 2V, so for 2A 1ohm.

thanx a lot

 

[banh]

just a small question, as i'm not strong in electronics....

when using with L298, is the method of control bipolar? (center tap unconnected)
and when using power transistors or N-MOSFETS to control, is the method unipolar (as I see the center tap connected to VCC)..

which method is more recommended?

 

[jbeng]

Here's a link where you can download the datasheet from ST Microelectronics:
https://www.st.com/stonline/books/pdf/docs/1773.pdf
JB

 

[ChrisP]

Here's a link where you can download the datasheet from ST Microelectronics:
https://www.st.com/stonline/books/pdf/docs/1773.pdf
JB

Or, of course, you could look right here on electro-tech-online! The following documents are available here (see the Locally Hosted Datasheets thread in the Datasheets Forum:

• L297 Stepper Motor Controller Application Notes
• L297 Stepper Motor Controller Datasheet
• L297-L298 Monolithic Bridge Driver Circuit Applications
• L298 Dual Full Bridge Driver Datasheet

 

[banh]

what are the fast recovery/fast switching didoes can I use? (1N4148 ?)

 

[ChrisP]

How much current do you need to handle? 1N4148 is rated at 300mA continuous; 1N4448 at 500mA. Both show 4ns recovery. The FR152 is also a 100PIV device and is rated at 1.5A, but has much higher recovery time, to 150ns.

**broken link removed**
Chenyi FR15x Series

 

[banh]

Thanks for your reply,

I can see that I can use L298 to drive the stepper motor. Or I can use the simpler method of using power transistor (e.g. TIP31) to drive it unipolar way (center tap connected to Vcc). So which method is better?
i mean driving unipolar and bipolar way, which one yields better performance?