T
treez
Guest
Hello,
We are doing a 48V to 1V5 SMPS using a vicor PRM48 power module feeding down to a VTM48 vicor “electronic transformer”. (the intermediate voltage is 36V).
On page 21 of the PRM48 datasheet, the output voltage of the PRM48 is shown to slowly ramp up at startup….also, during this startup, the PRM48 output current is being held very low. What is controlling this?.....i mean , we like it…because we want that soft start, but we want to assure we get it…but what controls it?……The PRM48 does not regulate below 20vout, …and we would really like it to rise slowly from 0vout to 20vout so that the output of the VTM48 can also slowly ramp up. …But how do we get the PRM48 to slowly ramp through 0vout to 20vout when that is outside its regulation range?
PRM48 datasheet
http://cdn.vicorpower.com/documents/datasheets/PRM48JH480T250A00-ds.pdf
- - - Updated - - -
VTM48 datasheet
http://cdn.vicorpower.com/documents/datasheets/VTM48E_020_080A00.pdf
We are doing a 48V to 1V5 SMPS using a vicor PRM48 power module feeding down to a VTM48 vicor “electronic transformer”. (the intermediate voltage is 36V).
On page 21 of the PRM48 datasheet, the output voltage of the PRM48 is shown to slowly ramp up at startup….also, during this startup, the PRM48 output current is being held very low. What is controlling this?.....i mean , we like it…because we want that soft start, but we want to assure we get it…but what controls it?……The PRM48 does not regulate below 20vout, …and we would really like it to rise slowly from 0vout to 20vout so that the output of the VTM48 can also slowly ramp up. …But how do we get the PRM48 to slowly ramp through 0vout to 20vout when that is outside its regulation range?
PRM48 datasheet
http://cdn.vicorpower.com/documents/datasheets/PRM48JH480T250A00-ds.pdf
- - - Updated - - -
VTM48 datasheet
http://cdn.vicorpower.com/documents/datasheets/VTM48E_020_080A00.pdf