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UCC25600: ucc25600-design support

Smitha R
Intellectual 790 points
Part Number: UCC25600

We are planning to change the power supply design due to a change request from client to meet some new requirements.

Currently I am using NCP1392 ON semi part and it is configured as open loop fixed PWM half bridge converter.

At present, I have identified a new IC from TI -UCC2560 which I want to use only to have the overcurrent protection.

I do not want to use the resonant feature of the IC in my design and I have configured the design as per my requirement.

Please refer the attachment and let me know your suggestion. Also, please suggest me if you have any other solutions to meet my requirement.

 Configuration of design is as shown below.

Below is our existing half bridge converter schematic using ON-SEMI part - NCP1392BDR2G            

  • 0
    TI__Mastermind 40120 points
    Hello Smitha,

    Thank you for your interest in the UCC25600 controller. I have alerted the appropriate applications team to your question, and you should receive a response soon.

    Regards,
    Ulrich
  • 0 in reply to Ulrich Goerke
    TI__Mastermind 25570 points

    Hello Smitha

    The UCC25600 is normally used to control a LLC power stage - variable frequency etc, but it should work in the application you show with a fixed resistor at the RT pin. One thing that you should watch for is that the frequency programmed by a given current at the RT pin can vary according to the K_ICO specification - somewhere between 60 and 100 Hz/uA. Normally this variation is compensated for by the feedback loop but not if you have a fixed resistor at RT. You may need to add some form of trimming but then again these are 6 sigma limits so you may not have a problem in practice.

    The current sensing transformer will detect only positive currents - you should use a bridge rectifier so that it detects both positive and negative currents - ie it would then detect an over current in either direction.

    Regards
    Colin