as we know ,the ADum3323 is the isolated half-bridge driver, in the Datasheet P16 , the SCH is as below
we can see that, the GNDA is floating, can we connect the GNDA to a negative voltage, like -5V or else ??
The ADuM3223 has three separate ground regions. One ground region is the primary side (Pins 1-8), Channel A (Pins 14-16), and Channel B (Pins 9-11). Each of these regions can move freely with respect to each other, as long as the isolation voltage is not exceeded (in the hundreds of volts).
To answer your question, GNDA can be set to -5V with respect to GND1. VDDA must still be at or above GNDA, and not more than 18 V above GNDA.
You could even use Channel A as the high-side of a half-bridge if it helped.
Dear R Schnell
Thank you very much for your comments ! It is very helpful !
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