UCC28070 is Four-Phase period Quesion.
I use UCC28070 and operate it in Four-Phase period, but switching becomes unstable.
Specifications input voltage 100V, output voltage 390V, coil 100μH, switching frequency 40kHz, output current 30A.
When output current more than 25A, switching become unstable.
I put a bypass condenser in IMO pin, but switching become stop.
What there be any idea?
For example, may not you put resistance in an IMO pin?
When you put resistance, would you teach a minimum, a maximum?
Regard.
Bob Lee