di/dt limit for LNK623
Posted by: krau
on
I want to use the LNK623 for a 150 to 450V input, 4.5V 1W output supply. When I enter this I get a warning about too low of primary inductance, too high di/dt. What is the maximum di/dt that can be used for this part? Thanks.
Comments
150 to 450VDC
Hi,
For a reduced power level, the spreadsheet will calculate a smaller value of required inductance. Once the inductance value drops below a certain limit ( or the di/dt is higher than a certain limit) the spreadsheet will issue a warning.
The best option will be to design for a slightly higher power level and drop the value of VOR.
Regards
PI-Sarek
Hi,
Is your input specification 150VAC to 450VAC? or 150VDC to 450VDC?
Regards
PI-Sarek