L298 for step motor - Electronic Circuits Projects Diagrams Free

banh · 21st June 2004, 06:06 AM

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

Sebi · 21st June 2004, 09:40 AM

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

JFDuval · 21st June 2004, 11:42 AM

Hi!

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

banh · 21st June 2004, 02:47 PM

Quote:

Originally Posted by Sebi

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

thanx a lot

banh · 21st June 2004, 02:51 PM

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 · 21st June 2004, 11:52 PM

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

ChrisP · 22nd June 2004, 12:34 AM

Quote:

Originally Posted by jbeng

Here's a link where you can download the datasheet from ST Microelectronics:
http://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:

banh · 23rd June 2004, 03:39 AM

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

ChrisP · 23rd June 2004, 04:00 AM

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.

1N4148/1N4448 Diodes Inc
Chenyi FR15x Series

banh · 23rd June 2004, 08:19 AM

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?

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21st June 2004, 06:06 AM	(permalink)
banh	L298 for step motor Hi, I wanna use L298 for step motor. how to estimate the values of sense resistors? what is usually the value range?

21st June 2004, 09:40 AM	(permalink)
Sebi	This value depend from desired (enabled) current. As the datasheet show, the sensing voltage is 2V, so for 2A 1ohm.

21st June 2004, 11:42 AM	(permalink)
JFDuval	Hi! If you understand french, go to machivi.ma.cx __________________ JFDuval jfduval --@-- aqra.ca http://www.aqra.ca

21st June 2004, 02:51 PM	(permalink)
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?

21st June 2004, 11:52 PM	(permalink)
jbeng	Here's a link where you can download the datasheet from ST Microelectronics: http://www.st.com/stonline/books/pdf/docs/1773.pdf JB

23rd June 2004, 03:39 AM	(permalink)
banh	what are the fast recovery/fast switching didoes can I use? (1N4148 ?)

23rd June 2004, 04:00 AM	(permalink)
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. 1N4148/1N4448 Diodes Inc Chenyi FR15x Series

23rd June 2004, 08:19 AM	(permalink)
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?