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UCC3895: The problem of building the circuit

Rhea Gao
Expert 2580 points
Part Number: UCC3895

Tool/software:

Hi,

The peripheral circuit built by the customer using the UCC3895 chip and referring to the technical manual is shown in the following figure:

The customer hopes to adjust the duty cycle size through EA+20 pins, but the TI simulation software on the official website shows no corresponding change.

The current requirement is an output of 400KHz with a dead time of over 300ns, corresponding to a controllable duty cycle size.

Thanks~

  • 0
    TI__Guru* 85896 points

    Hello,

    This is being worked on.

    Regards,

  • 0 in reply to Mike O'
    TI__Guru* 85896 points

    Hello,

     

    If you are testing this in an open loop circuit when A and D or B and C are on the transformer will have the input voltage applied across it.

     

    Out A through D will have 50% duty cycle.  Out A and B is fixed to the master clock and are 180 degrees out of phase.  Out C and D are phase shifted to achieve duty cycle.

     

    So, in your open loop circuit look at phase A and D outputs and vary the voltage amplifier non-inverting input from 0 to 2 V.  You should seed output D phase shifted from 180 degrees out of phase to 100 degrees out of phase.

    Regards,