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senthilprakash
senthilprakash
Associate
October 17, 2014
Question

L6474 Grounding

  • October 17, 2014
  • 3 replies
  • 638 views
Posted on October 17, 2014 at 13:21

Dear Enrico,

In my application, I have a power board (generating 24V, 7V) and control board (contains uC, L6474) connected with cables. I have used 24V for L6474 Power pins and 5V for Microcontroller and Digital logic of L6474. As suggested in datasheets, all ground pins of L6474 (PGND, AGND, DGND) are tied to 24V gnd. Ground track of 5V is rated only for 1Amp whereas 24V ground track is rated for 3A. I'm using a star point connection to connect 24Vgnd and 5V gnd. How to ensure the motor current  doesn't take 5V gnd path  for return? Please refer the attachment.

Regards

Senthil

#l6474-grounding #l6474-grounding
This topic has been closed for replies.

3 replies

Enrico Poli
Enrico Poli
ST Employee
November 3, 2014
Posted on November 03, 2014 at 16:22

Dear Senthil,

I see no attachments in your post.

Regards

Enrico

senthilprakash
senthilprakashAuthor
Associate
November 7, 2014
Posted on November 07, 2014 at 12:27

Dear Enrico,

Attachment done.

Regards

________________

Attachments :

image2014-10-17-160617.pdf : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006HzHd&d=%2Fa%2F0X0000000bJF%2Fcr15DlY6xd.GAQ3O1KR4c8IkMRig0.apvtd9lUqgQIo&asPdf=false
Enrico Poli
Enrico Poli
ST Employee
November 17, 2014
Posted on November 17, 2014 at 10:54

Dear Senthil,

The AGND, DGND and PGND of the device are internally connected, so it is not reccomended to connect them to different ground path.

I can only suggest you merging both the grounds in an single line after the star connection.

Regrads

Enrico

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