Hi team,
Does UCC28881 support 7V output with 200mA~300mA load in non-iso flybuck topology? As read from datasheet, the limitation is 225mA in open frame design. Where is the output current limitation coming from? Also is there any limitation on output voltage? (I imagine higher output voltage can reduce output current.)
In addition, Is above same in UCC28911?
Regards,
Hayashi
Hi Hayashi-san,
The UCC28881 is a general-purpose switch that can be used as a high-voltage buck converter. The switch current is internally limited as shown below:
When operating in CCM the average current handling capability is limited to 225mA. If you try to support more than that, the device will likely go into thermal shutdown. This is described here:
The UCC28910 is designed as a valley-switched PSR flyback. While it has been used in the buck configuration, the control law of this converter dramatically limits the amount of power you can deliver. It is best when used as designed as a flyback converter. You will find that we are typically able to operate at a higher efficiency when compared to other converters in this power range.
I hope this answers your question.
