CHIPMUNK_kevin
Newbie level 4
Hello ,
Does anybody know how to select nldmos for your BUCK converter based on BVDSS/eSOA /CHC ?
For example , if design a 17V BUCK converter , there will be 16V/18V/20V nldmos could be used ,and their Rsp and BVDSS are different ,so if I select 20V nldmos , it will be more robust for my design , but its Rsp will be larger so need more die size .In contrary , if I select 16V nldmos ,its Rsp is smaller ,and will save some die size ,but i am not sure if it's robust enough .
I know somebody also use 12V nldmos used as low side powerfet in their 16V/17V buck converter design , this depends on the process used , here I want to know how to evaluate if the performance of 12V nldmos is good enough for my design .For example , if the minimum BVDSS of 12V nldmos > 21V (17V+4V margin) , I could use it as low side fet in my 17V BUCK converter ? Here 4V margin is because of SW(PH) point will have 3V~4V ring during switching based on my experience .
Also eSOA/CHC characteristic will take an effect to your selection .
So does anybody could guide me on how to select your HS/LS nldmos or recommend some materials to me about this topic ?
Thanks so much .
Does anybody know how to select nldmos for your BUCK converter based on BVDSS/eSOA /CHC ?
For example , if design a 17V BUCK converter , there will be 16V/18V/20V nldmos could be used ,and their Rsp and BVDSS are different ,so if I select 20V nldmos , it will be more robust for my design , but its Rsp will be larger so need more die size .In contrary , if I select 16V nldmos ,its Rsp is smaller ,and will save some die size ,but i am not sure if it's robust enough .
I know somebody also use 12V nldmos used as low side powerfet in their 16V/17V buck converter design , this depends on the process used , here I want to know how to evaluate if the performance of 12V nldmos is good enough for my design .For example , if the minimum BVDSS of 12V nldmos > 21V (17V+4V margin) , I could use it as low side fet in my 17V BUCK converter ? Here 4V margin is because of SW(PH) point will have 3V~4V ring during switching based on my experience .
Also eSOA/CHC characteristic will take an effect to your selection .
So does anybody could guide me on how to select your HS/LS nldmos or recommend some materials to me about this topic ?
Thanks so much .