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Do I need flyback diodes at the output for bipolar steppers with the STSPIN220 chip? I've been looking at examples and everything show direct connections. Shouldn't I be worried about ESD and transients? Thanks for your help.

SSan.2
Associate
 
1 ACCEPTED SOLUTION

Accepted Solutions
Peter BENSCH
ST Employee

The internal MOSFETs already have freewheeling diodes, their forward voltages have been specified in the datasheet with typ. 900mV at 1.3A, i.e. at the max. driving current.

Whether you should use Schottky diodes in parallel with the internal freewheeling diodes depends on your EMI, efficiency, and total cost needs.

Good luck!

If the problem is resolved, please mark this topic as answered by selecting Select as best. This will help other users find that answer faster.

/Peter

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

View solution in original post

1 REPLY 1
Peter BENSCH
ST Employee

The internal MOSFETs already have freewheeling diodes, their forward voltages have been specified in the datasheet with typ. 900mV at 1.3A, i.e. at the max. driving current.

Whether you should use Schottky diodes in parallel with the internal freewheeling diodes depends on your EMI, efficiency, and total cost needs.

Good luck!

If the problem is resolved, please mark this topic as answered by selecting Select as best. This will help other users find that answer faster.

/Peter

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.