Hello,
I designed the schematic from reference design for LM5175PWPR (Buck Boost ) converter. I used exactly same components and values that mentioned in the reference design . I have fixed RFbt value is 453K ohm and Rfbb value is 20K ohm as per the recommendation. If I give Input voltage is 14V means I getting 13.5V as output and If I give 7V input means I get only 6.5V only.
But My required output voltage is 19V/3Amps fixed even though input may vary from 14V to 15V getting from the battery my output should be constant 19v/3A for laptop charge. So please suggest me sort out this problem as soon as possible. Please see the attached schematic and advise me where I need to change the values. Its an urgent task for me.
PLease email me on- info@kentronicsengineering.comSchematic Prints_Boost.pdf