ADUM3220 Gate driver floating supply

Hi,

I have a question about a testing set up that I am implementing using ADUM3220 evaluation board. I have a full bridge of MOSFETs to implement LLC Converter, the input DC bus can go up to 400 v the output after the transformer is 48 v dc and the power is 350 Watt.

I am using three different power supplies (E3630A ) form Keysight, two of them to power the two high side gate voltages and one for the low side switches.

When I start increasing the dc bus higher than 50 v , the gate driver power supply reading (E3630A ) goes up.

I connect the oscilloscope across the power supply but I still can see the constant 15 volt of the gate driver even though the digital reading on the power supply is different.

Any idea on what is happening?

Regards 

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    •  Analog Employees 
    on Aug 2, 2018 3:15 PM
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

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    EZ Admin
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  • 0
    •  Analog Employees 
    on Aug 2, 2018 3:15 PM
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
    EZ Admin
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