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L298N motor driver

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jwatte:

--- Quote from: jim on May 03, 2013, 07:02:28 AM ---why is 1n4007 diode better than 1n4001?

--- End quote ---


In engineering, you have to choose the right part given the known requirements.
The main difference between 1n4007 and 1n4001 is the rated voltage.
Personally, I think the 1000V rated voltage of the 1n4007 is way overkill, and a 1n4001 would be quite good enough for the job.
In fact, I think in your case (small motor,) a fast-recovery signal diode like 1n4148 might be used, and would save a little cost/board space/leakage current.

To make up your own mind, read the data sheets:

1n4001, 1n4007: http://www.diodes.com/datasheets/ds28002.pdf
1n4148: http://www.nxp.com/documents/data_sheet/1N4148_1N4448.pdf

jim:
thank you .. i got it..  ;D

Duane Degn:
I've read several places that Schottky diodes are preferred as flyback diodes since they have such fast switching times.

SparkFun has this one listed under their L298N chips.

https://www.sparkfun.com/products/10926

Any reasons not to think it would be a good diode to use with a L298N controller?

waltr:
That Schottky should work fine.
I also tend to use Schottky diodes across coils due to their fast switch times.

jwatte:
Schottkys are fine. Note that the 1N4148 I recommended actually switches FASTER than most Schottkys, and has lower capacitance (which doesn't matter here); the main benefit of Schottkys is that you can often get them in higher amp ratings than conventional fast-recovery diodes. For a bigger motor, that's a good idea. For a small motor, a small diode is good enough (me and Soren had a discussion about this a while back on this forum, if I recall correctly)

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