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UCC28070A: Replacing CT and Shunt with Hall Current Sensor

Tony Bussan
Prodigy 70 points
Part Number: UCC28070A

Has anyone attempted to replace the current transformer feedback in their switching converter designs with isolated hall current sensors or the like?  Are there any non-obvious hazards with this approach?

Thanks!

Tony

  • 0
    TI__Mastermind 34465 points
    Hello Tony,
    You can use a current transformer or a shunt resistor for sensing the switching current but I do not believe it is possible to use a Hall sensor for this application. The big issue with these devices is the the bandwidth is limited to a few hundred kHz and this is just not high enough when the switching frequency of the pfc is normally above 100kHz. There is also issues with offsets and accuracy at low current levels, as well as the requirement to power the device from a bipolar supply.
    If you get it working it will cost more than a current transformer and have no real advantage over the CT.
    Regards
    John