LM5001 design equations for 12V automotive application

Hi Brian.

Why don't you consider to implement a flyback topology rather than SEPIC?

It's easiear and you don't need to use two magnetic cores...

Bye

Paolo

You may consider the LM5118 in a buck-boost topology, employing a single inductor.  The LM5118Q is AEC-Q100 Grade 1 qualified for automotive applications.  It has Webench support.  

Thanks,

Youhao Xi, Applications Engineering, TI SVA-PPD Phoenix Design Center

Hi ,

I am also working on a design with the LM5001 (http://www.ti.com/lit/ds/symlink/lm5001.pdf) for 9 - 48V in, 12V out @ 1A. I am planning to use the 12V automotive SEPIC converter (Figure 10 in datasheet). Webench doesnt use this schematic for its LM5001 solution. Is there an excel design application or set of equations to determine the component values for using the 12V automotive SEPIC in particular?

Brian do you have any advice to me?

Thanks in advance for the help,

You may consider the LM5000 instead of LM5001 for your 12Vout @1A application.  The LM5000 switch current is limited at 2A, while the LM5001 at 1A.  The latter cannot support full load current  for VIN <15V, assuming your inductor current has 20% ripple. and overall efficiency of >80%....

LM5000 is suitable for SEPIC configuration