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Variable Phase-Shifted Full-Bridge PWM Controller (LM5046/UCC28950)

David Backus
Prodigy 40 points
Other Parts Discussed in Thread: UCC27524, UCC27324, CONTROLSUITE, LM5046

Hello, we are looking for a variable Phase-Shifted Full-Bridge Controller (With Synchronous Rectification) to create a variable DC-DC converter. The LM5046 & UCC28950 controllers have the majority of the features except the ability to directly control by a micro (TMS320F28035). Does TI offer similar PWM controllers that can be controlled by a micro?

This was originally posted in the AC/DC and Isolated DC/DC Power Forum and was suggested to be posted in the C2000 Forum.

Thanks.

  • 0
    TI__Guru 57255 points

    David,

    Perhaps my terminology is off, but I believe you want a 'PWM Driver'.  In this case the C2000 device would generate a PWM (based on its control loop) and then the PWM Driver would increase the voltage of the signal and increase the strength to something more suitable for FET driving.

    In this case, the C2000 group has been using the UCC27324 pretty consistently in our kits (although we've heard that the UCC27524 is an improved part). 

    In case you haven't seen it, the following evaluation kit may be worth a look: http://www.ti.com/tool/tmdshvpsfbkit 
    (its schematics, software, documentation and more can all be found in controlSUITE)

    Hopefully this helps some.


    Thank you,
    Brett

  • 0 in reply to Brett Larimore
    Prodigy 40 points

    Brett, thanks for the response. This part is only a gate driver. We are looking for a complete bridge controller that performs the phase shift control and synchronous rectification of both sides of the transformer, like the LM5046, but with micro control of the setpoint.

  • 0 in reply to David Backus
    TI__Guru 57255 points

    David,

    My apologies, I understand what you're trying to do now.

    I am not as familiar with TI's analog controller portfolio.  Our group generally does digital control of power topologies.  However it is very possible to use PWM of the C2000 MCU as a DAC or use a DAC on an MSP430 MCU to provide a 0-3.3V signal.  Assuming that the analog controller's setpoint can be provided externally (via a resistor divider or something similar), you should be able to tie the analog and digital together to do what you want. 

    My experience is more with analog lighting controllers where PWM, DAC, and sometimes serial can be an option for the setpoint medium between MCU and controller(s).

    I'll forward this to a few other people in my group who may have looked at these PSFB controllers in a more detailed way.  This being said, I think you'll find better analog part recommendations in the Iso DC/DC forum. 


    Thank you,
    Brett