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DC DC Converter

T.K. Choudhary
Prodigy 40 points

Pls find the attached design for DC DC Converter. Output loads are horn & lights. The input is battery. The Converter is being used on a battery operated two wheeler. I am getting a huge failure on the design. Most failed item is output diode & sometime Mosfet. Pls reveiew & suggest.

  • 0
    Prodigy 30 points

    Hi,

    The resolution of your diagram makes it a little difficult to see the detail. What is the range of input voltage, the output voltage and the maximum required output current?

  • 0
    Prodigy 40 points

    Input

    Minimum Voltage                 40V DC

    Maximum Voltage                60V DC

    Nominal Voltage            48V DC

    Output

    Output Voltage             12V ± 0.5V DC

    Output Current             8A Continuous

    Efficiency                 More than 85%

  • 0 in reply to T.K. Choudhary
    TI__Mastermind 36110 points

    Thank you for designing with TI products.  I'm confident we can provide some guidance to help you resolve this.  I wanted to give a gentle reminder that the subject line of a post should always start with the IC's part number, followed by a short description of the question or problem.  This format helps the factory sort and answer questions as well as helps future forum searches.

  • 0 in reply to T.K. Choudhary
    Intellectual 750 points
    Hello T.K ,

    I am also working on same dc to dc converter , can you please help me.
  • 0
    Prodigy 70 points

    revising the ucc2845 model, I had found that the duty cycle was sporadic. It had deviated in proportion to the large negative spike as it switched directly to ground. Referencing "Modular macromodeling techniques for SPICE simulators" I had placed 300 ohm discharge resistor that gets switched to ground. Solved the large negative spike problem. I had also set the reference voltage checks to 2.5VDC, to approximate the digital signal threshold.

    Here is a blurb of the change to the oscillator definition.

    ****OSCILLATOR*****
    STOF1 8 GND DISCH GND SOSC
    *.....P...N...CP..CN
    GBDISCH RTCT GND Value = { IF ( V(8,GND) < 2.5 & V(13,GND) > 2.5, 8.4M, 0 ) }
    RPULLUP 8 VREF 100K
    RPULLDN RTCT DISCH 300
    *$