my question is to know if the GNDA and GNDB of the ADuM3223 can be supporting a negative voltage. I need a -6V potentiel tieded at the ground.
Yes, the ADuM3223 can be operated in a fashion to deliver a negative voltage to a gate of a switching device. If you have two separate isolated DC/DC converters per channel, one way to achieve this is the following:
In this example, the source of the power devices being driven is connected to the midpoint of the two supplies per channel. When the channel output is high, the gate will see 10 V relative to the source node. When the channel is low, the gate will see -6 V relative to the source node. The ADuM3223 itself sees both supplies as a single 16 V supply. The ADuM3223 has an output voltage range of up to 18 V, so going much higher than 10 V is not recommended if -6 V is required.
The two isolated DC/DC supplies is an easier case to demonstrate, but in reality, the extra supplies would often prove to be too costly for an actual market product. The negative voltage offset can be created by many clever methods. One of the quickest, and least expensive is biasing a zener diode. This creates a miniature voltage source, at the cost of a constant quiescent current. By sizing the decoupling correctly vs. the effective gate capacitance of the switching device, this weak voltage source is able to support the negative voltage on turn on.
Other methods to produce the negative voltage include clever feed forward setups the only allow the negative voltage to exist at edge transitions (when you want to protect against the miller turn on) from a series of resistor and capacitor voltage dividers, charge-pump like implementations, unregulated/regulated center tapped flyback setups, and a local LDO run off of a single isolated DC/DC supply.
I hope this gives you some ideas for a solution.
is the ADuM3223 need terminations resistors for both inputs to limits the current?
the input vary between 0 and 5V.
The ADuM3223 has CMOS inputs, and don't need current limiting resistors. The ADuM3223 inputs, VIA and VIB, look like MOSFET gates, and a DC voltage is fine for them. You may add resistors if desired, but they are not needed.
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