Hi,
I am using the DCPA10505P in an application where a capacitive load can be driven by an analog output stage. I have very strong and accurate transient response and stability from the DCPA10505P, however with an increasing capacitive load in the range of 100nF and above, the current demand on the DCPA10505P exceeds the maximum continuous rating of 200mA max.
The overcurrent transient is well below the internal current limit cutoff of ~1.75A. It is peaking at ~400mA @ 100nF, has a gaussian look, and is time limited to about 40us. The voltage drop on the isolated 5V rail is ~ 80mV.
This current peak increases with an increase in the capacitive output load, and so does the voltage drop.
The datasheet specifies :
Should I worry about the excessive current being drawn by the internal FETs / transformer inside the DCPA10505P and can TI add some guidance as to wether this behavior can be sustained by the device or if I should avoid or limit the capacitive load that can be driven by the analog output stage ?
Thank you very much for your help and time.
