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UCD3138ALLCEVM150: Regarding the role of VIN_MON feedback signal from PWR050 to the UCD3138064AEVM149 in existing firmware.

PP N
Prodigy 210 points
Part Number: UCD3138ALLCEVM150

Hello,

I have a UCD3138ALLCEVM150 LLC evaluation board with me.

With reference to the UCD3138ALLCEVM150  schematic snapshot attached below, I intend to know the function of the VIN_MON signal that is feedback from the PWR050 flyback bias power supply to the ADC06 pin of  UCD3138064AEVM149 controller card.

Is VIN_MON simply for monitoring the input DC voltage or it is also a part of the control loop? Kindly let me know.

In actual I want to replace the PWR050 bias supply with external DC input, where VIN_MON signal will not be available.

So, I wish to know what all firmware changes will be required in order to operate without PWR050 PCB board.

  • 0
    TI__Intellectual 1660 points
    PP N said:
    Is VIN_MON simply for monitoring the input DC voltage or it is also a part of the control loop? Kindly let me know.

    VIN_MON is used for the input voltage monitor to realize some function like VIN ON LIMIT & VIN OFF LIMIT. This signal is not for the power control.

    PP N said:

    In actual I want to replace the PWR050 bias supply with external DC input, where VIN_MON signal will not be available.

    So, I wish to know what all firmware changes will be required in order to operate without PWR050 PCB board.

    This signal may be necessary during the start up. The UCD will monitor input voltage via this signal and when the VIN over 310V the system start to ramp up.

  • 0 in reply to Peter Ban
    Prodigy 210 points

    I thank you for the early response.

    Can you please help me out with this:

    In actual I want to replace the PWR050 bias supply with external DC input, where VIN_MON signal will not be available.

    So, can you please help me with the firmware changes required in order to operate without PWR050 PCB board (and hence without the available VIN_MON signal).

  • +1 in reply to PP N
    TI__Intellectual 1660 points

    Hi, you can change the "adc_values_avg.vin_mon" related code to disable VIN related function such as VIN protection and VIN ON/OFF function. But VIN_MON maybe necessary to monitor input voltage during start up to avoid the over inrush current.

  • 0 in reply to Peter Ban
    Prodigy 210 points

    Thank you Peter for the response.