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UCC28056: Could I use this IC for boost to 120V@VIN=24V?

Allen Huang
Prodigy 140 points
Part Number: UCC28056
Other Parts Discussed in Thread: UCC28C53

Tool/software:

Dear support team

Please help confirm below condition and requirement:

1. Vin=24V, it is for both boost VIN and IC VCC pin.
2. Vout=120V@pulse current=50mA(1ms), normal current=1mA

  • 0
    TI__Mastermind 40580 points

    Hello Allen, 

    In principle, the UCC28056 can boost 24V to 120V because it is a boost controller. 
    Practical considerations may or may not make it suitable for your application. 

    First, is your input 24Vdc, or 24Vac?  
    DC or AC, what is the +/- tolerance range of the input?  
    Line frequency range if AC? 
    For the load, what is the duty cycle of the 1ms pulse?  

    The UCC28056 controller is optimized for "universal-line" AC input and boosting to ~390Vdc. 
    It has several features connected with the ZCD/CS input that do not scale well for low input and output voltages.
    In particular, see the paragraph in Section 9.2.2.3 located just below Equation (56) on page 36 of the datasheet. 

    If the results for Brownin, line feedforward, and OVP2 thresholds do not scale appropriately for your application, I suggest to consider a different controller for your boost. 
    The type of controller depends on whether you are boosting DC or AC. 

    Regards,
    Ulrich

  • 0 in reply to Ulrich Goerke
    Prodigy 140 points

    Hi Ulrich

    VIN=DCV 20~24
    VOUT=120V
    average current=5mA, pulse current=50mA

  • 0 in reply to Allen Huang
    TI__Mastermind 40580 points

    Hi Allen, 

    Thank you for the information.  I calculate that the duty cycle of the 50mA load is 0.08163, which translates to 1ms out of a 12.25ms period. 
    Is that correct? 

    For a ~0.6W(avg) DC/DC converter, I think that a general-purpose PWM controller is better suited to your application; either a DCM-boost or a DCM-flyback.   

    I will redirect your inquiry to the appropriate controller group.

    Regards,
    Ulrich

  • 0 in reply to Ulrich Goerke
    TI__Mastermind 40580 points

    Hello Allen, 

    To receive support from the correct controller group, please submit a new E2E thread using the part number "UCC28C53" in the title. 
    Don't use UCC28056, please. 

    I will close this thread. 

    Regards,
    Ulrich