i use an ADumM 4223 for a 2 phase motor driver and found a problematic start condition.
The AD is powered like this: VDD1 = +5V, VDDB = 15V and VDDA = 15V with out switching (bootstrap).
GND1 and GNDB are tight together for test purpose.
The power suppy comes from a fast starting test modul.
All supplies starting together (within 2ms).
2.) VIA = 0V, VIB = 0V, DISABLE = 0V
All Inputs (e.g. VIA, VIB, DISABLE) have never been toggled since the start of the power supplies.
Output VOB is +15V ! But it should be 0V
If the inputs are toggled once then everything is correct (e.g. VOA = 0V => VOB = 0V).
Could any body give me an hint about the problem.
I could not find any restrictions about an "power-up" schedule in the data sheets or app's on analog.com