Hello,
My customer is leading stepper servo customer in industrial. Now they are testing ISO1410 and found a issue of output voltage ripple.
As below circuit, if with pull up and pull down R73 and R74, they found output voltage ripple of VAB(by differential probe) is quite big, much bigger than 5V_485's ripple(as below left waveform). But if remove R73 and R74, then the ripple level become normal(as below right waweform). The ripple frequency is same as DCDC switching frequency.
