H
Hammy
I have some Flyback transformers (from CoilCraft) these were
originally intended for use in a 70W 60kHz application using the
NCP1200. If I increase the switching frequency to 100kHz is it
reasonable to expect 90-100W using the same core?
I've been running simulations and the rms and peak current for 100kHz
equalizes at 90W ,with the 70W 60kHz flyback. There is a higher DC
component of course (about 10-15%) due to a reduced switching cycle,
the converter is deeper in CCM.
I had a sheet giving approximation on core power throughput vs
frequency and it shows that for 70W 70kHz increasing the Frequency to
100kHz the same E-Core could handle a little over 100W. I know I could
expect higher DC winding losses; in a pinch I could add another
parallel winding there is already two it would be tight though.
Any magnetic experts out there?
originally intended for use in a 70W 60kHz application using the
NCP1200. If I increase the switching frequency to 100kHz is it
reasonable to expect 90-100W using the same core?
I've been running simulations and the rms and peak current for 100kHz
equalizes at 90W ,with the 70W 60kHz flyback. There is a higher DC
component of course (about 10-15%) due to a reduced switching cycle,
the converter is deeper in CCM.
I had a sheet giving approximation on core power throughput vs
frequency and it shows that for 70W 70kHz increasing the Frequency to
100kHz the same E-Core could handle a little over 100W. I know I could
expect higher DC winding losses; in a pinch I could add another
parallel winding there is already two it would be tight though.
Any magnetic experts out there?