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UCC2897A: UCC2897A: -48V input support || design support

Gopi Narayanan
Prodigy 20 points
Part Number: UCC2897A
Other Parts Discussed in Thread: UCC2803, UCC2805

Tool/software:

Hi Team,

We have a requirement to convert -48V to +12V @3A (or above) and came across the UCC2897A. I would like to check whether this part can accept a negative Input (-48V typ) within the range of -32V ~ -72V.

It would be great if you could provide your input on this. Your suggestions are highly appreciated.

Thank You..!

  • 0
    TI__Guru 73905 points

    Hi,

    Yes, you just need to reverse the input connected to the UCC2897A converter. You know a battery has + and -, you can connect the battery either way so the same for your input voltage to UCC2897A converter.

  • 0 in reply to Hong Huang
    Prodigy 20 points

    Thank You..!

    I am considering my input voltage as either -48V or +48V, and it should work accordingly. Is there any additional input circuitry required before connecting to the UCC2897A? (as input either +48V OR -48V)

    Additionally, we are looking for a 12V output at 3A (or above) with a wide input range of 4.5V ~ 60V (above). Could you provide any suggestion for this requirement? Note: If my input is 10V or lower, it should not affect the Output generation (12V @3A).

    Best Regards,

    Gopi.

  • 0 in reply to Gopi Narayanan
    TI__Guru 73905 points

    Hi,

    Then you can add a full bridge rectifier between the input voltage and the converter so the I converter can get correct input no matter +48V or -48V.

    UCC2897A minimum voltage input needs to be 12.7V so it does not work when lower than this. You need to add a boost converter to get the voltage higher than 12.7V.

  • 0 in reply to Hong Huang
    Prodigy 20 points

    Thank you for the clarification. I'm fine with the first statement.

    Could you please suggest a power topology (ICs) that supports a wide input range of 4.5V ~ 60V and providing a constant 12V output at 3A (or above)?

  • 0 in reply to Gopi Narayanan
    TI__Guru 73905 points

    Hi,

    UCC2803 or UCC2805 but these are not active clamp and we do not have active clamp can do 4.5V input.