UC1863: Dead time and ZVS issue

christopher parmar

Part Number: UC1863

Hi,

I am new to resonant converter design. I am using UC1863 for my LLC half bridge design. I want to operate it for 100KHz design. In my design i have used pulse transformer after mosfet driver. I dont know how UC1863 is controlling the dead time between high side and low side mosfet. currently, in my bench test, as high side and low side mosfet switching are overlapped, the circuit is taking too much current from input.

Please suggest me how to achieve ZVS using UC1863 IC. Is there any particular pin which is taking care of it ?

over 6 years ago

0 Kyle Rakos over 6 years ago

TI__Mastermind 20045 points

Hello Christopher,

I will look into your question and see if this is information we will be able to find. As this is a very old part it may be difficult to find application information. However, here are two app notes that may be helpful if you are just getting started with this design:

Thanks,

Kyle

0 Kyle Rakos over 6 years ago in reply to Kyle Rakos

TI__Mastermind 20045 points

Hello Chris,

Are you still having issues? If so are you having cross-conduction between your two drivers? If so I'm surprised the MOSFETs haven't been damaged. If you still need help please upload your schematic.

Thanks,
Kyle

Space & High Reliability (Read Only)

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UC1863: Dead time and ZVS issue