Using LM3150 with VERY variable load

Hi Lowe,

We'll take look at this and get back to you on Monday, hope it's okay.

Regards,

Doyel

Hi Lowe,

Please can you share with us your design schematic? Also, by 'shifting' of loads, do you mean controlled transients or random steps?

The datasheet 'Design Guide' section gives a good description on calculating the compensation, also I've attached here a document that might be of help :

LM3150_5X_QS_MOS_Selector.xls

Thanks,

Doyel

Well, Doyel, since this is a redesign that is not implemented yet, there is not schematics yet.

To give you a little basic info on the application: There is an input voltage of 34-36V, nom 35V and very stable. The output should  be 27V with a load of 0 to 7 amps. The external load will vary some, but not with giant peaks. Maybe +/- 1-2 amps briefly (during few seconds, random steps).

In my design I would like to use the current limiter of the LM3150 set to around 10A (and no hick-up mode).

Does this answer your question?

Regards

/Lowe

 

Hi Lowe,

I think the best approach would be to use the attached spreadsheet /Webench and datasheet 'Design guide' to help you redesign ; after which we can check it out in the bench for you.

Regards,
Doyel

Hi Doyel,

Will do that! Do you think there are any issues if the load drops very low (for example 50mA)?

Regards,
/Lowe

Hi Lowe,

As long as the compensation is okay, I don't think there will be any issues. It's best however to check it once on the bench once you get your design.

Regards,

Doyel